Added some more documentation for define_readers and define_writer of the...

Added some more documentation for define_readers and define_writer of the Association and its inherited classes

activerecord/lib/active_record/associations/builder/association.rb

@@ -73,6 +73,13 @@ def valid_options
     def validate_options
       options.assert_valid_keys(valid_options)
     end
+    
+    # Defines the setter and getter methods for the association
+    # class Post < ActiveRecord::Base
+    #   has_many :comments
+    # end
+    # 
+    # Post.first.comments and Post.first.comments= methods are defined by this method...
 
     def define_accessors
       define_readers

activerecord/lib/active_record/associations/builder/collection_association.rb

+# This class is inherited by the has_many and has_many_and_belongs_to_many association classes 
+
 require 'active_record/associations'
 
 module ActiveRecord::Associations::Builder
@@ -66,6 +68,8 @@ def define_callback(callback_name)
       model.send("#{full_callback_name}=", Array(options[callback_name.to_sym]))
     end
 
+    # Defines the setter and getter methods for the collection_singular_ids.
+
     def define_readers
       super
 

activerecord/lib/active_record/associations/builder/singular_association.rb

+# This class is inherited by the has_one and belongs_to association classes 
+
 module ActiveRecord::Associations::Builder
   class SingularAssociation < Association #:nodoc:
     def valid_options
@@ -13,6 +15,8 @@ def define_accessors
       define_constructors if constructable?
     end
 
+    # Defines the (build|create)_association methods for belongs_to or has_one association
+    
     def define_constructors
       mixin.class_eval <<-CODE, __FILE__, __LINE__ + 1
         def build_#{name}(*args, &block)