kevintyll · August 28, 2009 13:07 · Aug 28, 2009 · Aug 28, 2009 · Aug 28, 2009
diff --git a/active_record_validation_warnings.rb b/active_record_validation_warnings.rb
@@ -42,8 +42,9 @@ class Warnings < Errors
   end
 
   module Validations
-    def self.included(base) # :nodoc:
-      base.extend ClassMethods
+    Base.class_eval do
+      # we need to put the method chain back in.
+      alias_method_chain :valid?, :callbacks
     end
     # Active Record classes can implement validations in several ways. The highest level, easiest to read,
     # and recommended approach is to use the declarative <tt>validates_..._of</tt> class methods (and

diff --git a/Active Record Validation Warnings → active_record_validation_warnings.rb b/Active Record Validation Warnings → active_record_validation_warnings.rb
@@ -1,5 +1,29 @@
 module ActiveRecord
 
+  # This override allows for validation methods to provide warnings on attributes, as well as errors.  Use this
+  # to provide friendly warnings to your users when your business rules change, prior to turning on the new validations
+  # and preventing your customers from saving records before they have a chance to change their system.
+  #
+  # Every AR object will now have 2 collections +record.errors+ and +record.warnings+.
+  #
+  # To set warnings, just add the +:level => :warning+ option to any validation method.
+  #
+  #   validates_presence_of :phone_number, :level => :warning
+  #
+  # If phone_number is blank, it will now be stuffed into the warnings collection, instead of the errors collection.
+  # The record will still be saved as long as the errors collection is empty, regardless of what is in the warnings
+  # collection.
+  #
+  # To add this functionality to your app, just save this code in a file in your lib directory, and require it in an initializer or
+  # environment.rb.
+  #
+  # This code basically is a rewrite of the validations.rb file in active_record, so it's only compatible with Rails 2.x, and may need to
+  # change with future version of Rails.  It was written agains Rails 2.3.2
+  #
+  # This code was based on code written by Michael Schuerig.  https://rails.lighthouseapp.com/projects/8994/tickets/107-level-hooks-for-validations
+
+
+
   class Base
     # Returns the Warnings object that holds all information about attribute warning messages.
     def warnings

diff --git a/gistfile2.txt b/gistfile2.txt
diff --git a/Active Record Validation Warnings b/Active Record Validation Warnings
@@ -0,0 +1,659 @@
+module ActiveRecord
+
+  class Base
+    # Returns the Warnings object that holds all information about attribute warning messages.
+    def warnings
+      @warnings ||= Warnings.new(self)
+    end
+
+    def valid?
+      warnings.clear
+      super
+    end
+  end
+
+  # Active Record validation is reported to and from this object, which is used by Base#save to
+  # determine whether the object would fail validations and prevent a save if the :level => warning flag were removed.
+  class Warnings < Errors
+  end
+
+  module Validations
+    def self.included(base) # :nodoc:
+      base.extend ClassMethods
+    end
+    # Active Record classes can implement validations in several ways. The highest level, easiest to read,
+    # and recommended approach is to use the declarative <tt>validates_..._of</tt> class methods (and
+    # +validates_associated+) documented below. These are sufficient for most model validations.
+    #
+    # Slightly lower level is +validates_each+. It provides some of the same options as the purely declarative
+    # validation methods, but like all the lower-level approaches it requires manually adding to the errors collection
+    # when the record is invalid.
+    #
+    # At a yet lower level, a model can use the class methods +validate+, +validate_on_create+ and +validate_on_update+
+    # to add validation methods or blocks. These are ActiveSupport::Callbacks and follow the same rules of inheritance
+    # and chaining.
+    #
+    # The lowest level style is to define the instance methods +validate+, +validate_on_create+ and +validate_on_update+
+    # as documented in ActiveRecord::Validations.
+    #
+    # == +validate+, +validate_on_create+ and +validate_on_update+ Class Methods
+    #
+    # Calls to these methods add a validation method or block to the class. Again, this approach is recommended
+    # only when the higher-level methods documented below (<tt>validates_..._of</tt> and +validates_associated+) are
+    # insufficient to handle the required validation.
+    #
+    # This can be done with a symbol pointing to a method:
+    #
+    #   class Comment < ActiveRecord::Base
+    #     validate :must_be_friends
+    #
+    #     def must_be_friends
+    #       errors.add_to_base("Must be friends to leave a comment") unless commenter.friend_of?(commentee)
+    #     end
+    #   end
+    #
+    # Or with a block which is passed the current record to be validated:
+    #
+    #   class Comment < ActiveRecord::Base
+    #     validate do |comment|
+    #       comment.must_be_friends
+    #     end
+    #
+    #     def must_be_friends
+    #       errors.add_to_base("Must be friends to leave a comment") unless commenter.friend_of?(commentee)
+    #     end
+    #   end
+    #
+    # This usage applies to +validate_on_create+ and +validate_on_update+ as well.
+    module ClassMethods
+      #      DEFAULT_VALIDATION_OPTIONS = {
+      #        :on => :save,
+      #        :allow_nil => false,
+      #        :allow_blank => false,
+      #        :message => nil
+      #      }.freeze
+      #
+      #      ALL_RANGE_OPTIONS = [ :is, :within, :in, :minimum, :maximum ].freeze
+      #      ALL_NUMERICALITY_CHECKS = { :greater_than => '>', :greater_than_or_equal_to => '>=',
+      #        :equal_to => '==', :less_than => '<', :less_than_or_equal_to => '<=',
+      #        :odd => 'odd?', :even => 'even?' }.freeze
+
+      # Encapsulates the pattern of wanting to validate a password or email address field with a confirmation. Example:
+      #
+      #   Model:
+      #     class Person < ActiveRecord::Base
+      #       validates_confirmation_of :user_name, :password
+      #       validates_confirmation_of :email_address, :message => "should match confirmation"
+      #     end
+      #
+      #   View:
+      #     <%= password_field "person", "password" %>
+      #     <%= password_field "person", "password_confirmation" %>
+      #
+      # The added +password_confirmation+ attribute is virtual; it exists only as an in-memory attribute for validating the password.
+      # To achieve this, the validation adds accessors to the model for the confirmation attribute. NOTE: This check is performed
+      # only if +password_confirmation+ is not +nil+, and by default only on save. To require confirmation, make sure to add a presence
+      # check for the confirmation attribute:
+      #
+      #   validates_presence_of :password_confirmation, :if => :password_changed?
+      #
+      # Configuration options:
+      # * <tt>:message</tt> - A custom error message (default is: "doesn't match confirmation").
+      # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
+      # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      def validates_confirmation_of(*attr_names)
+        configuration = { :level => :error, :on => :save }
+        configuration.update(attr_names.extract_options!)
+
+        attr_accessor(*(attr_names.map { |n| "#{n}_confirmation" }))
+
+        validates_each(attr_names, configuration) do |record, attr_name, value|
+          unless record.send("#{attr_name}_confirmation").nil? or value == record.send("#{attr_name}_confirmation")
+            record.send(configuration[:level].to_s.pluralize.to_sym).add(attr_name, :confirmation, :default => configuration[:message])
+          end
+        end
+      end
+
+      # Encapsulates the pattern of wanting to validate the acceptance of a terms of service check box (or similar agreement). Example:
+      #
+      #   class Person < ActiveRecord::Base
+      #     validates_acceptance_of :terms_of_service
+      #     validates_acceptance_of :eula, :message => "must be abided"
+      #   end
+      #
+      # If the database column does not exist, the +terms_of_service+ attribute is entirely virtual. This check is
+      # performed only if +terms_of_service+ is not +nil+ and by default on save.
+      #
+      # Configuration options:
+      # * <tt>:message</tt> - A custom error message (default is: "must be accepted").
+      # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
+      # * <tt>:allow_nil</tt> - Skip validation if attribute is +nil+ (default is true).
+      # * <tt>:accept</tt> - Specifies value that is considered accepted.  The default value is a string "1", which
+      #   makes it easy to relate to an HTML checkbox. This should be set to +true+ if you are validating a database
+      #   column, since the attribute is typecast from "1" to +true+ before validation.
+      # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      def validates_acceptance_of(*attr_names)
+        configuration = { :level => :error, :on => :save, :allow_nil => true, :accept => "1" }
+        configuration.update(attr_names.extract_options!)
+
+        db_cols = begin
+          column_names
+        rescue Exception # To ignore both statement and connection errors
+          []
+        end
+        names = attr_names.reject { |name| db_cols.include?(name.to_s) }
+        attr_accessor(*names)
+
+        validates_each(attr_names,configuration) do |record, attr_name, value|
+          unless value == configuration[:accept]
+            record.send(configuration[:level].to_s.pluralize.to_sym).add(attr_name, :accepted, :default => configuration[:message])
+          end
+        end
+      end
+
+      # Validates that the specified attributes are not blank (as defined by Object#blank?). Happens by default on save. Example:
+      #
+      #   class Person < ActiveRecord::Base
+      #     validates_presence_of :first_name
+      #   end
+      #
+      # The first_name attribute must be in the object and it cannot be blank.
+      #
+      # If you want to validate the presence of a boolean field (where the real values are true and false),
+      # you will want to use <tt>validates_inclusion_of :field_name, :in => [true, false]</tt>.
+      #
+      # This is due to the way Object#blank? handles boolean values: <tt>false.blank? # => true</tt>.
+      #
+      # Configuration options:
+      # * <tt>message</tt> - A custom error message (default is: "can't be blank").
+      # * <tt>on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>,
+      #   <tt>:update</tt>).
+      # * <tt>if</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>).
+      #   The method, proc or string should return or evaluate to a true or false value.
+      # * <tt>unless</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>).
+      #   The method, proc or string should return or evaluate to a true or false value.
+      #
+      def validates_presence_of(*attr_names)
+        configuration = { :level => :error, :on => :save }
+        configuration.update(attr_names.extract_options!)
+
+        # can't use validates_each here, because it cannot cope with nonexistent attributes,
+        # while errors.add_on_empty can
+        send(validation_method(configuration[:on]), configuration) do |record|
+          record.send(configuration[:level].to_s.pluralize.to_sym).add_on_blank(attr_names, configuration[:message])
+        end
+      end
+
+      # Validates that the specified attribute matches the length restrictions supplied. Only one option can be used at a time:
+      #
+      #   class Person < ActiveRecord::Base
+      #     validates_length_of :first_name, :maximum=>30
+      #     validates_length_of :last_name, :maximum=>30, :message=>"less than {{count}} if you don't mind"
+      #     validates_length_of :fax, :in => 7..32, :allow_nil => true
+      #     validates_length_of :phone, :in => 7..32, :allow_blank => true
+      #     validates_length_of :user_name, :within => 6..20, :too_long => "pick a shorter name", :too_short => "pick a longer name"
+      #     validates_length_of :fav_bra_size, :minimum => 1, :too_short => "please enter at least {{count}} character"
+      #     validates_length_of :smurf_leader, :is => 4, :message => "papa is spelled with {{count}} characters... don't play me."
+      #     validates_length_of :essay, :minimum => 100, :too_short => "Your essay must be at least {{count}} words."), :tokenizer => lambda {|str| str.scan(/\w+/) }
+      #   end
+      #
+      # Configuration options:
+      # * <tt>:minimum</tt> - The minimum size of the attribute.
+      # * <tt>:maximum</tt> - The maximum size of the attribute.
+      # * <tt>:is</tt> - The exact size of the attribute.
+      # * <tt>:within</tt> - A range specifying the minimum and maximum size of the attribute.
+      # * <tt>:in</tt> - A synonym(or alias) for <tt>:within</tt>.
+      # * <tt>:allow_nil</tt> - Attribute may be +nil+; skip validation.
+      # * <tt>:allow_blank</tt> - Attribute may be blank; skip validation.
+      # * <tt>:too_long</tt> - The error message if the attribute goes over the maximum (default is: "is too long (maximum is {{count}} characters)").
+      # * <tt>:too_short</tt> - The error message if the attribute goes under the minimum (default is: "is too short (min is {{count}} characters)").
+      # * <tt>:wrong_length</tt> - The error message if using the <tt>:is</tt> method and the attribute is the wrong size (default is: "is the wrong length (should be {{count}} characters)").
+      # * <tt>:message</tt> - The error message to use for a <tt>:minimum</tt>, <tt>:maximum</tt>, or <tt>:is</tt> violation.  An alias of the appropriate <tt>too_long</tt>/<tt>too_short</tt>/<tt>wrong_length</tt> message.
+      # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
+      # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      # * <tt>:tokenizer</tt> - Specifies how to split up the attribute string. (e.g. <tt>:tokenizer => lambda {|str| str.scan(/\w+/)}</tt> to
+      #   count words as in above example.)
+      #   Defaults to <tt>lambda{ |value| value.split(//) }</tt> which counts individual characters.
+      def validates_length_of(*attrs)
+        # Merge given options with defaults.
+        options = { :level => :error,
+          :tokenizer => lambda {|value| value.split(//)}
+        }.merge(DEFAULT_VALIDATION_OPTIONS)
+        options.update(attrs.extract_options!.symbolize_keys)
+
+        # Ensure that one and only one range option is specified.
+        range_options = ALL_RANGE_OPTIONS & options.keys
+        case range_options.size
+        when 0
+          raise ArgumentError, 'Range unspecified.  Specify the :within, :maximum, :minimum, or :is option.'
+        when 1
+          # Valid number of options; do nothing.
+        else
+          raise ArgumentError, 'Too many range options specified.  Choose only one.'
+        end
+
+        # Get range option and value.
+        option = range_options.first
+        option_value = options[range_options.first]
+        key = {:is => :wrong_length, :minimum => :too_short, :maximum => :too_long}[option]
+        custom_message = options[:message] || options[key]
+
+        case option
+        when :within, :in
+          raise ArgumentError, ":#{option} must be a Range" unless option_value.is_a?(Range)
+
+          validates_each(attrs, options) do |record, attr, value|
+            value = options[:tokenizer].call(value) if value.kind_of?(String)
+            if value.nil? or value.size < option_value.begin
+              record.send(options[:level].to_s.pluralize.to_sym).add(attr, :too_short, :default => custom_message || options[:too_short], :count => option_value.begin)
+            elsif value.size > option_value.end
+              record.send(options[:level].to_s.pluralize.to_sym).add(attr, :too_long, :default => custom_message || options[:too_long], :count => option_value.end)
+            end
+          end
+        when :is, :minimum, :maximum
+          raise ArgumentError, ":#{option} must be a nonnegative Integer" unless option_value.is_a?(Integer) and option_value >= 0
+
+          # Declare different validations per option.
+          validity_checks = { :is => "==", :minimum => ">=", :maximum => "<=" }
+          validates_each(attrs, options) do |record, attr, value|
+            value = options[:tokenizer].call(value) if value.kind_of?(String)
+            unless !value.nil? and value.size.method(validity_checks[option])[option_value]
+              record.send(options[:level].to_s.pluralize.to_sym).add(attr, key, :default => custom_message, :count => option_value)
+            end
+          end
+        end
+      end
+
+      alias_method :validates_size_of, :validates_length_of
+
+
+      # Validates whether the value of the specified attributes are unique across the system. Useful for making sure that only one user
+      # can be named "davidhh".
+      #
+      #   class Person < ActiveRecord::Base
+      #     validates_uniqueness_of :user_name, :scope => :account_id
+      #   end
+      #
+      # It can also validate whether the value of the specified attributes are unique based on multiple scope parameters.  For example,
+      # making sure that a teacher can only be on the schedule once per semester for a particular class.
+      #
+      #   class TeacherSchedule < ActiveRecord::Base
+      #     validates_uniqueness_of :teacher_id, :scope => [:semester_id, :class_id]
+      #   end
+      #
+      # When the record is created, a check is performed to make sure that no record exists in the database with the given value for the specified
+      # attribute (that maps to a column). When the record is updated, the same check is made but disregarding the record itself.
+      #
+      # Configuration options:
+      # * <tt>:message</tt> - Specifies a custom error message (default is: "has already been taken").
+      # * <tt>:scope</tt> - One or more columns by which to limit the scope of the uniqueness constraint.
+      # * <tt>:case_sensitive</tt> - Looks for an exact match. Ignored by non-text columns (+true+ by default).
+      # * <tt>:allow_nil</tt> - If set to true, skips this validation if the attribute is +nil+ (default is +false+).
+      # * <tt>:allow_blank</tt> - If set to true, skips this validation if the attribute is blank (default is +false+).
+      # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      #
+      # === Concurrency and integrity
+      #
+      # Using this validation method in conjunction with ActiveRecord::Base#save
+      # does not guarantee the absence of duplicate record insertions, because
+      # uniqueness checks on the application level are inherently prone to race
+      # conditions. For example, suppose that two users try to post a Comment at
+      # the same time, and a Comment's title must be unique. At the database-level,
+      # the actions performed by these users could be interleaved in the following manner:
+      #
+      #               User 1                 |               User 2
+      #  ------------------------------------+--------------------------------------
+      #  # User 1 checks whether there's     |
+      #  # already a comment with the title  |
+      #  # 'My Post'. This is not the case.  |
+      #  SELECT * FROM comments              |
+      #  WHERE title = 'My Post'             |
+      #                                      |
+      #                                      | # User 2 does the same thing and also
+      #                                      | # infers that his title is unique.
+      #                                      | SELECT * FROM comments
+      #                                      | WHERE title = 'My Post'
+      #                                      |
+      #  # User 1 inserts his comment.       |
+      #  INSERT INTO comments                |
+      #  (title, content) VALUES             |
+      #  ('My Post', 'hi!')                  |
+      #                                      |
+      #                                      | # User 2 does the same thing.
+      #                                      | INSERT INTO comments
+      #                                      | (title, content) VALUES
+      #                                      | ('My Post', 'hello!')
+      #                                      |
+      #                                      | # ^^^^^^
+      #                                      | # Boom! We now have a duplicate
+      #                                      | # title!
+      #
+      # This could even happen if you use transactions with the 'serializable'
+      # isolation level. There are several ways to get around this problem:
+      # - By locking the database table before validating, and unlocking it after
+      #   saving. However, table locking is very expensive, and thus not
+      #   recommended.
+      # - By locking a lock file before validating, and unlocking it after saving.
+      #   This does not work if you've scaled your Rails application across
+      #   multiple web servers (because they cannot share lock files, or cannot
+      #   do that efficiently), and thus not recommended.
+      # - Creating a unique index on the field, by using
+      #   ActiveRecord::ConnectionAdapters::SchemaStatements#add_index. In the
+      #   rare case that a race condition occurs, the database will guarantee
+      #   the field's uniqueness.
+      #
+      #   When the database catches such a duplicate insertion,
+      #   ActiveRecord::Base#save will raise an ActiveRecord::StatementInvalid
+      #   exception. You can either choose to let this error propagate (which
+      #   will result in the default Rails exception page being shown), or you
+      #   can catch it and restart the transaction (e.g. by telling the user
+      #   that the title already exists, and asking him to re-enter the title).
+      #   This technique is also known as optimistic concurrency control:
+      #   http://en.wikipedia.org/wiki/Optimistic_concurrency_control
+      #
+      #   Active Record currently provides no way to distinguish unique
+      #   index constraint errors from other types of database errors, so you
+      #   will have to parse the (database-specific) exception message to detect
+      #   such a case.
+      def validates_uniqueness_of(*attr_names)
+        configuration = { :level => :error, :case_sensitive => true }
+        configuration.update(attr_names.extract_options!)
+
+        validates_each(attr_names,configuration) do |record, attr_name, value|
+          # The check for an existing value should be run from a class that
+          # isn't abstract. This means working down from the current class
+          # (self), to the first non-abstract class. Since classes don't know
+          # their subclasses, we have to build the hierarchy between self and
+          # the record's class.
+          class_hierarchy = [record.class]
+          while class_hierarchy.first != self
+            class_hierarchy.insert(0, class_hierarchy.first.superclass)
+          end
+
+          # Now we can work our way down the tree to the first non-abstract
+          # class (which has a database table to query from).
+          finder_class = class_hierarchy.detect { |klass| !klass.abstract_class? }
+
+          column = finder_class.columns_hash[attr_name.to_s]
+
+          if value.nil?
+            comparison_operator = "IS ?"
+          elsif column.text?
+            comparison_operator = "#{connection.case_sensitive_equality_operator} ?"
+            value = column.limit ? value.to_s[0, column.limit] : value.to_s
+          else
+            comparison_operator = "= ?"
+          end
+
+          sql_attribute = "#{record.class.quoted_table_name}.#{connection.quote_column_name(attr_name)}"
+
+          if value.nil? || (configuration[:case_sensitive] || !column.text?)
+            condition_sql = "#{sql_attribute} #{comparison_operator}"
+            condition_params = [value]
+          else
+            condition_sql = "LOWER(#{sql_attribute}) #{comparison_operator}"
+            condition_params = [value.mb_chars.downcase]
+          end
+
+          if scope = configuration[:scope]
+            Array(scope).map do |scope_item|
+              scope_value = record.send(scope_item)
+              condition_sql << " AND " << attribute_condition("#{record.class.quoted_table_name}.#{scope_item}", scope_value)
+              condition_params << scope_value
+            end
+          end
+
+          unless record.new_record?
+            condition_sql << " AND #{record.class.quoted_table_name}.#{record.class.primary_key} <> ?"
+            condition_params << record.send(:id)
+          end
+
+          finder_class.with_exclusive_scope do
+            if finder_class.exists?([condition_sql, *condition_params])
+              record.send(configuration[:level].to_s.pluralize.to_sym).add(attr_name, :taken, :default => configuration[:message], :value => value)
+            end
+          end
+        end
+      end
+
+
+      # Validates whether the value of the specified attribute is of the correct form by matching it against the regular expression
+      # provided.
+      #
+      #   class Person < ActiveRecord::Base
+      #     validates_format_of :email, :with => /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i, :on => :create
+      #   end
+      #
+      # Note: use <tt>\A</tt> and <tt>\Z</tt> to match the start and end of the string, <tt>^</tt> and <tt>$</tt> match the start/end of a line.
+      #
+      # A regular expression must be provided or else an exception will be raised.
+      #
+      # Configuration options:
+      # * <tt>:message</tt> - A custom error message (default is: "is invalid").
+      # * <tt>:allow_nil</tt> - If set to true, skips this validation if the attribute is +nil+ (default is +false+).
+      # * <tt>:allow_blank</tt> - If set to true, skips this validation if the attribute is blank (default is +false+).
+      # * <tt>:with</tt> - The regular expression used to validate the format with (note: must be supplied!).
+      # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
+      # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      def validates_format_of(*attr_names)
+        configuration = { :level => :error, :on => :save, :with => nil }
+        configuration.update(attr_names.extract_options!)
+
+        raise(ArgumentError, "A regular expression must be supplied as the :with option of the configuration hash") unless configuration[:with].is_a?(Regexp)
+
+        validates_each(attr_names, configuration) do |record, attr_name, value|
+          unless value.to_s =~ configuration[:with]
+            record.send(configuration[:level].to_s.pluralize.to_sym).add(attr_name, :invalid, :default => configuration[:message], :value => value)
+          end
+        end
+      end
+
+      # Validates whether the value of the specified attribute is available in a particular enumerable object.
+      #
+      #   class Person < ActiveRecord::Base
+      #     validates_inclusion_of :gender, :in => %w( m f ), :message => "woah! what are you then!??!!"
+      #     validates_inclusion_of :age, :in => 0..99
+      #     validates_inclusion_of :format, :in => %w( jpg gif png ), :message => "extension {{value}} is not included in the list"
+      #   end
+      #
+      # Configuration options:
+      # * <tt>:in</tt> - An enumerable object of available items.
+      # * <tt>:message</tt> - Specifies a custom error message (default is: "is not included in the list").
+      # * <tt>:allow_nil</tt> - If set to true, skips this validation if the attribute is +nil+ (default is +false+).
+      # * <tt>:allow_blank</tt> - If set to true, skips this validation if the attribute is blank (default is +false+).
+      # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      def validates_inclusion_of(*attr_names)
+        configuration = { :level => :error, :on => :save }
+        configuration.update(attr_names.extract_options!)
+
+        enum = configuration[:in] || configuration[:within]
+
+        raise(ArgumentError, "An object with the method include? is required must be supplied as the :in option of the configuration hash") unless enum.respond_to?(:include?)
+
+        validates_each(attr_names, configuration) do |record, attr_name, value|
+          unless enum.include?(value)
+            record.send(configuration[:level].to_s.pluralize.to_sym).add(attr_name, :inclusion, :default => configuration[:message], :value => value)
+          end
+        end
+      end
+
+      # Validates that the value of the specified attribute is not in a particular enumerable object.
+      #
+      #   class Person < ActiveRecord::Base
+      #     validates_exclusion_of :username, :in => %w( admin superuser ), :message => "You don't belong here"
+      #     validates_exclusion_of :age, :in => 30..60, :message => "This site is only for under 30 and over 60"
+      #     validates_exclusion_of :format, :in => %w( mov avi ), :message => "extension {{value}} is not allowed"
+      #   end
+      #
+      # Configuration options:
+      # * <tt>:in</tt> - An enumerable object of items that the value shouldn't be part of.
+      # * <tt>:message</tt> - Specifies a custom error message (default is: "is reserved").
+      # * <tt>:allow_nil</tt> - If set to true, skips this validation if the attribute is +nil+ (default is +false+).
+      # * <tt>:allow_blank</tt> - If set to true, skips this validation if the attribute is blank (default is +false+).
+      # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      def validates_exclusion_of(*attr_names)
+        configuration = { :level => :error, :on => :save }
+        configuration.update(attr_names.extract_options!)
+
+        enum = configuration[:in] || configuration[:within]
+
+        raise(ArgumentError, "An object with the method include? is required must be supplied as the :in option of the configuration hash") unless enum.respond_to?(:include?)
+
+        validates_each(attr_names, configuration) do |record, attr_name, value|
+          if enum.include?(value)
+            record.send(configuration[:level].to_s.pluralize.to_sym).add(attr_name, :exclusion, :default => configuration[:message], :value => value)
+          end
+        end
+      end
+
+      # Validates whether the associated object or objects are all valid themselves. Works with any kind of association.
+      #
+      #   class Book < ActiveRecord::Base
+      #     has_many :pages
+      #     belongs_to :library
+      #
+      #     validates_associated :pages, :library
+      #   end
+      #
+      # Warning: If, after the above definition, you then wrote:
+      #
+      #   class Page < ActiveRecord::Base
+      #     belongs_to :book
+      #
+      #     validates_associated :book
+      #   end
+      #
+      # this would specify a circular dependency and cause infinite recursion.
+      #
+      # NOTE: This validation will not fail if the association hasn't been assigned. If you want to ensure that the association
+      # is both present and guaranteed to be valid, you also need to use +validates_presence_of+.
+      #
+      # Configuration options:
+      # * <tt>:message</tt> - A custom error message (default is: "is invalid")
+      # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
+      # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      def validates_associated(*attr_names)
+        configuration = { :level => :error, :on => :save }
+        configuration.update(attr_names.extract_options!)
+
+        validates_each(attr_names, configuration) do |record, attr_name, value|
+          unless (value.is_a?(Array) ? value : [value]).collect { |r| r.nil? || r.valid? }.all?
+            record.send(configuration[:level].to_s.pluralize.to_sym).add(attr_name, :invalid, :default => configuration[:message], :value => value)
+          end
+        end
+      end
+
+      # Validates whether the value of the specified attribute is numeric by trying to convert it to
+      # a float with Kernel.Float (if <tt>only_integer</tt> is false) or applying it to the regular expression
+      # <tt>/\A[\+\-]?\d+\Z/</tt> (if <tt>only_integer</tt> is set to true).
+      #
+      #   class Person < ActiveRecord::Base
+      #     validates_numericality_of :value, :on => :create
+      #   end
+      #
+      # Configuration options:
+      # * <tt>:message</tt> - A custom error message (default is: "is not a number").
+      # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
+      # * <tt>:only_integer</tt> - Specifies whether the value has to be an integer, e.g. an integral value (default is +false+).
+      # * <tt>:allow_nil</tt> - Skip validation if attribute is +nil+ (default is +false+). Notice that for fixnum and float columns empty strings are converted to +nil+.
+      # * <tt>:greater_than</tt> - Specifies the value must be greater than the supplied value.
+      # * <tt>:greater_than_or_equal_to</tt> - Specifies the value must be greater than or equal the supplied value.
+      # * <tt>:equal_to</tt> - Specifies the value must be equal to the supplied value.
+      # * <tt>:less_than</tt> - Specifies the value must be less than the supplied value.
+      # * <tt>:less_than_or_equal_to</tt> - Specifies the value must be less than or equal the supplied value.
+      # * <tt>:odd</tt> - Specifies the value must be an odd number.
+      # * <tt>:even</tt> - Specifies the value must be an even number.
+      # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      def validates_numericality_of(*attr_names)
+        configuration = { :level => :error, :on => :save, :only_integer => false, :allow_nil => false }
+        configuration.update(attr_names.extract_options!)
+
+
+        numericality_options = ALL_NUMERICALITY_CHECKS.keys & configuration.keys
+
+        (numericality_options - [ :odd, :even ]).each do |option|
+          raise ArgumentError, ":#{option} must be a number" unless configuration[option].is_a?(Numeric)
+        end
+
+        validates_each(attr_names,configuration) do |record, attr_name, value|
+          raw_value = record.send("#{attr_name}_before_type_cast") || value
+
+          next if configuration[:allow_nil] and raw_value.nil?
+
+          if configuration[:only_integer]
+            unless raw_value.to_s =~ /\A[+-]?\d+\Z/
+              record.send(configuration[:level].to_s.pluralize.to_sym).add(attr_name, :not_a_number, :value => raw_value, :default => configuration[:message])
+              next
+            end
+            raw_value = raw_value.to_i
+          else
+            begin
+              raw_value = Kernel.Float(raw_value)
+            rescue ArgumentError, TypeError
+              record.send(configuration[:level].to_s.pluralize.to_sym).add(attr_name, :not_a_number, :value => raw_value, :default => configuration[:message])
+              next
+            end
+          end
+
+          numericality_options.each do |option|
+            case option
+            when :odd, :even
+              unless raw_value.to_i.method(ALL_NUMERICALITY_CHECKS[option])[]
+                record.send(configuration[:level].to_s.pluralize.to_sym).add(attr_name, option, :value => raw_value, :default => configuration[:message])
+              end
+            else
+              record.send(configuration[:level].to_s.pluralize.to_sym).add(attr_name, option, :default => configuration[:message], :value => raw_value, :count => configuration[option]) unless raw_value.method(ALL_NUMERICALITY_CHECKS[option])[configuration[option]]
+            end
+          end
+        end
+      end
+    end
+  end
+end
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