Zero valued numeric attribute always updated when calling: update_attributes :field => "0.0" #9034
Description
Create a new rails app with a model that has a float or integer attribute:
$> rails new you_dirty_float
...
$> rails g model product price:float
...
$> rake db:migrate
When you create a product with price equals to 0.0, it always gets updated every time you call update_attributes with a string equals to "0.0":
> p = Product.create price: 0.0
INSERT INTO "products" ("created_at", "price", "updated_at") VALUES (?, ?, ?) ...
> p.update_attributes :price => "0.0"
(0.1ms) begin transaction
(0.6ms) UPDATE "products" SET "price" = 0.0, "updated_at" = '2013-01-23 01:18:52.633492' WHERE "products"."id" = 3
(1.8ms) commit transaction
> p.update_attribute :price, "0.0"
(0.1ms) begin transaction
(0.6ms) UPDATE "products" SET "price" = 0.0, "updated_at" = '2013-01-23 01:21:11.611959' WHERE "products"."id" = 3
(1.4ms) commit transactionFor the below commands, the object is not updated:
> p.update_attributes :price => 0.0
(0.1ms) begin transaction
(0.0ms) commit transaction
> p.update_attribute :price, 0.0
(0.1ms) begin transaction
(0.0ms) commit transaction
> p.update_attribute :price, "0"
(0.1ms) begin transaction
(0.0ms) commit transaction
> p.update_attribute :price, "0.0".to_f
(0.1ms) begin transaction
(0.0ms) commit transactionThis behavior was observed in both Rails 3.2.9 and 3.2.11.