1 files changed, 36 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/write.rb b/activerecord/lib/active_record/attribute_methods/write.rb
new file mode 100644
index 0000000000..aab816899c
--- /dev/null
+++ b/activerecord/lib/active_record/attribute_methods/write.rb
@@ -0,0 +1,36 @@
+module ActiveRecord
+  module AttributeMethods
+    module Write
+      extend ActiveSupport::Concern
+
+      included do
+        attribute_method_suffix "="
+      end
+
+      module ClassMethods
+        protected
+          def define_attribute_method=(attr_name)
+            evaluate_attribute_method attr_name, "def #{attr_name}=(new_value); write_attribute('#{attr_name}', new_value); end", "#{attr_name}="
+          end
+      end
+
+      # Updates the attribute identified by <tt>attr_name</tt> with the specified +value+. Empty strings for fixnum and float
+      # columns are turned into +nil+.
+      def write_attribute(attr_name, value)
+        attr_name = attr_name.to_s
+        @attributes_cache.delete(attr_name)
+        if (column = column_for_attribute(attr_name)) && column.number?
+          @attributes[attr_name] = convert_number_column_value(value)
+        else
+          @attributes[attr_name] = value
+        end
+      end
+
+      private
+        # Handle *= for method_missing.
+        def attribute=(attribute_name, value)
+          write_attribute(attribute_name, value)
+        end
+    end
+  end
+end