lunalium · February 2, 2016 04:36 · Jun 13, 2012
diff --git a/unscoped.rb b/unscoped.rb
@@ -0,0 +1,46 @@
+# Provides the ability to unscope associations, this solves problems described in
+# http://stackoverflow.com/questions/1540645/how-to-disable-default-scope-for-a-belongs-to/11012633#11012633
+#
+# Examples
+#
+#    class Document < ActiveRecord::Base
+#      default_scope where(deleted: false)
+#    end
+#
+#    class Comment < ActiveRecord::Base
+#      extend Unscoped
+#
+#      belongs_to :document
+#      unscope :document
+#    end
+#
+module Unscoped
+
+  # Public: Ensure a previously defined association is not scoped by a default_scope.
+  #
+  # associations - The Symbol with the name(s) of the associations to unscope.
+  #
+  # Examples
+  #
+  #    # Unscope a single assoication
+  #    unscope :document
+  #
+  #    # Unscope multiple in one way.
+  #    unscope :document, :comments
+  #
+  # Raises ArgumentError if the named association does not exist on the model, so ensure
+  # the association is defined _before_ calling `unscope`.
+  #
+  # Returns nothing.
+  def unscope(*associations)
+    associations.flatten.each do |association|
+      raise ArgumentError, "no association named #{association} exists on this model" unless self.reflect_on_association(*association)
+
+      class_eval <<-RUBY, __FILE__, __LINE__ + 1
+        def #{association}
+          self.class.reflect_on_association(#{association.inspect}).klass.unscoped { super }
+        end
+      RUBY
+    end
+  end
+end