Ruby中使用patch HTTP方法

如果使用patch，在后台可以看到只更新了改动的部分；

Started PATCH "/ads/5/update" for ::1 at 2017-04-20 20:12:40 +0800Processing by AdsController#update as HTML  Parameters: {"utf8"=>"✓", "authenticity_token"=>"bOnqooQydWJaKHET09i/Kho52m2t7CXgPlVgkjQW4iC2v5NZIEoBtk8Va7/sB5hDmQKhFLa/q32sTAnjtQJ1Vg==", "ad"=>{"name"=>"e1", "description"=>"e", "price"=>"5.0", "seller_id"=>"5", "email"=>"e", "img_url"=>"e"}, "commit"=>"Update1", "id"=>"5"}  Ad Load (1.0ms)  SELECT  "ads".* FROM "ads" WHERE "ads"."id" = ? LIMIT ?  [["id", 5], ["LIMIT", 1]]   (1.0ms)  begin transaction  SQL (1.0ms)  UPDATE "ads" SET "name" = ?, "updated_at" = ? WHERE "ads"."id" =?  [["name", "e1"], ["updated_at", 2017-04-20 12:12:40 UTC], ["id", 5]]   (154.2ms)  commit transactionRedirected to http://localhost:3000/ads/5Completed 302 Found in 165ms (ActiveRecord: 157.2ms)