Also batch attribute readers and writers

activemodel/lib/active_model/attribute_methods.rb

@@ -294,7 +294,7 @@ module ActiveModel
               generate_method = "define_method_#{matcher.target}"
 
               if respond_to?(generate_method, true)
-                send(generate_method, attr_name.to_s)
+                send(generate_method, attr_name.to_s, owner: owner)
               else
                 define_proxy_call true, owner, method_name, matcher.target, attr_name.to_s
               end
@@ -354,14 +354,23 @@ module ActiveModel
             @path = path
             @line = line
             @sources = ["# frozen_string_literal: true\n"]
+            @renames = {}
           end
 
           def <<(source_line)
             @sources << source_line
           end
 
+          def rename_method(old_name, new_name)
+            @renames[old_name] = new_name
+          end
+
           def execute
             @owner.module_eval(@sources.join(";"), @path, @line - 1)
+            @renames.each do |old_name, new_name|
+              @owner.alias_method new_name, old_name
+              @owner.undef_method old_name
+            end
           end
         end
         private_constant :CodeGenerator
@@ -527,7 +536,7 @@ module ActiveModel
         # to allocate an object on each call to the attribute method.
         # Making it frozen means that it doesn't get duped when used to
         # key the @attributes in read_attribute.
-        def self.define_attribute_accessor_method(mod, attr_name, writer: false)
+        def self.define_attribute_accessor_method(owner, attr_name, writer: false)
           method_name = "#{attr_name}#{'=' if writer}"
           if attr_name.ascii_only? && DEF_SAFE_NAME.match?(attr_name)
             yield method_name, "'#{attr_name}'"
@@ -538,8 +547,7 @@ module ActiveModel
             temp_method_name = "__temp__#{safe_name}#{'=' if writer}"
             attr_name_expr = "::ActiveModel::AttributeMethods::AttrNames::#{const_name}"
             yield temp_method_name, attr_name_expr
-            mod.alias_method method_name, temp_method_name
-            mod.undef_method temp_method_name
+            owner.rename_method(temp_method_name, method_name)
           end
         end
       end

activemodel/lib/active_model/attributes.rb

@@ -42,17 +42,14 @@ module ActiveModel
       end
 
       private
-        def define_method_attribute=(name)
+        def define_method_attribute=(name, owner:)
           ActiveModel::AttributeMethods::AttrNames.define_attribute_accessor_method(
-            generated_attribute_methods, name, writer: true,
+            owner, name, writer: true,
           ) do |temp_method_name, attr_name_expr|
-            generated_attribute_methods.module_eval <<-RUBY, __FILE__, __LINE__ + 1
-              # frozen_string_literal: true
-              def #{temp_method_name}(value)
-                name = #{attr_name_expr}
-                write_attribute(name, value)
-              end
-            RUBY
+            owner <<
+              "def #{temp_method_name}(value)" <<
+              "  write_attribute(#{attr_name_expr}, value)" <<
+              "end"
           end
         end
 

activerecord/lib/active_record/attribute_methods/read.rb

@@ -7,17 +7,14 @@ module ActiveRecord
 
       module ClassMethods # :nodoc:
         private
-          def define_method_attribute(name)
+          def define_method_attribute(name, owner:)
             ActiveModel::AttributeMethods::AttrNames.define_attribute_accessor_method(
-              generated_attribute_methods, name
+              owner, name
             ) do |temp_method_name, attr_name_expr|
-              generated_attribute_methods.module_eval <<-RUBY, __FILE__, __LINE__ + 1
-                # frozen_string_literal: true
-                def #{temp_method_name}
-                  name = #{attr_name_expr}
-                  _read_attribute(name) { |n| missing_attribute(n, caller) }
-                end
-              RUBY
+              owner <<
+                "def #{temp_method_name}" <<
+                "  _read_attribute(#{attr_name_expr}) { |n| missing_attribute(n, caller) }" <<
+                "end"
             end
           end
       end

activerecord/lib/active_record/attribute_methods/write.rb

@@ -11,17 +11,14 @@ module ActiveRecord
 
       module ClassMethods # :nodoc:
         private
-          def define_method_attribute=(name)
+          def define_method_attribute=(name, owner:)
             ActiveModel::AttributeMethods::AttrNames.define_attribute_accessor_method(
-              generated_attribute_methods, name, writer: true,
+              owner, name, writer: true,
             ) do |temp_method_name, attr_name_expr|
-              generated_attribute_methods.module_eval <<-RUBY, __FILE__, __LINE__ + 1
-                # frozen_string_literal: true
-                def #{temp_method_name}(value)
-                  name = #{attr_name_expr}
-                  _write_attribute(name, value)
-                end
-              RUBY
+              owner <<
+                "def #{temp_method_name}(value)" <<
+                "  _write_attribute(#{attr_name_expr}, value)" <<
+                "end"
             end
           end
       end