Renamed ApplicationModel to ApplicationRecord.

This new name is less general and more appropriate since these changes
are limited to Active Record.

Author: wangjohn

activerecord/lib/active_record/aggregations.rb

@@ -15,7 +15,7 @@ def clear_aggregation_cache #:nodoc:
     # existing object) and how it can be turned back into attributes (when the entity is saved to
     # the database).
     #
-    #   class Customer < ApplicationModel
+    #   class Customer < ApplicationRecord
     #     composed_of :balance, class_name: "Money", mapping: %w(balance amount)
     #     composed_of :address, mapping: [ %w(address_street street), %w(address_city city) ]
     #   end
@@ -136,7 +136,7 @@ def clear_aggregation_cache #:nodoc:
     # or an array. The <tt>:constructor</tt> and <tt>:converter</tt> options can be used to meet
     # these requirements:
     #
-    #   class NetworkResource < ApplicationModel
+    #   class NetworkResource < ApplicationRecord
     #     composed_of :cidr,
     #                 class_name: 'NetAddr::CIDR',
     #                 mapping: [ %w(network_address network), %w(cidr_range bits) ],

activerecord/lib/active_record/application_configuration.rb

@@ -4,24 +4,24 @@ module ApplicationConfiguration
 
     module ClassMethods
       def configs_from(mod)
-        app_model = self
+        app_record = self
 
         mod.singleton_class.instance_eval do
-          define_method(:application_model) { app_model }
+          define_method(:application_record) { app_record }
         end
 
         define_singleton_method(:configs_from_application) { application }
       end
 
-      def application_model(klass = nil)
+      def application_record(klass = nil)
         return ActiveRecord::Base unless klass
 
         klass = klass.class unless klass.respond_to?(:parents)
 
-        if klass.respond_to?(:application_model)
-          klass.application_model
-        elsif app_model = klass.parents.detect { |p| p.respond_to?(:application_model) }
-          app_model
+        if klass.respond_to?(:application_record)
+          klass.application_record
+        elsif app_record = klass.parents.detect { |p| p.respond_to?(:application_record) }
+          app_record
         else
           ActiveRecord::Base
         end