OfTheDelmer · August 27, 2015 19:01 · Aug 27, 2015
diff --git a/policy_calling.md b/policy_calling.md
@@ -0,0 +1,79 @@
+
+A `PolicyResult` class to help collect the `status` and `message` from a policy check
+
+```ruby
+class PolicyResult
+
+  attr_reader :message, :status
+
+  def initialize(params)
+    @status = params.fetch(:status, false)
+    @message = params.fetch(:message, :no_message)
+  end
+
+end
+```
+
+Then a refactor of a policy to return the status and optionally call a block with the full result
+
+Usage:
+
+```
+class User < ActiveRecord::Base
+...
+  def verifiable?(&block)
+    VerificationEligibilityPolicy.call &block
+  end
+  
+end
+
+current_user.verifiable? #=> true/false
+
+current_user.verifiable? do |result|
+  return nil if result.status
+  redirect_to root_path, error: result.message
+end
+```
+
+Which would have a refactor like the following:
+
+```ruby
+class VerificationEligibilityPolicy
+
+  MAX_ATTEMPTS = 2
+
+  def self.call(params, &block)
+    policy = new(params)
+    result = policy.eligible?
+    block.call result if block
+    result.status
+  end
+
+  def initialize(params)
+    @user = params.fetch(:user)
+    @attempts = @user.attempts.recent
+  end
+
+  ##
+  # checks that a user has not reached
+  # max verification attempts or
+  # that the user has waited past
+  # the retry time window: 1.day
+  def eligible?
+    if !@user.identified_person?
+      PolicyResult.new({message: "Create Identity"})
+    elsif @attempts.count < MAX_ATTEMPTS
+      next_time = @attempts.last.created_at + wait_time
+      PolicyResult.new({message: "Please wait #{next_time}"})
+    else
+      PolicyResult.new({staus: true})
+    end
+  end
+
+  private
+
+  def wait_time
+    1.day
+  end
+end
+```
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