Rails 如何在保存后更新列? [英] Rails how to update a column after saving?
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问题描述
我想为我的费率操作创建一个 after_save 方法.它将划分 rating_score/ratings 并更新列评级.
I want to create an after_save method for my rate action. It would divide rating_score/ratings and update the column rating.
class KonkurrancersController < ApplicationController
def rate
@konkurrancer = Konkurrancer.find(params[:id])
@container = "Konkurrancer"+@konkurrancer.id.to_s
@konkurrancer.rating_score += params[:vind][:rating].to_i
@konkurrancer.ratings += 1
@konkurrancer.save
respond_to do |format|
format.js
end
end
end
这是我的模型:
class Konkurrancer < ActiveRecord::Base
after_save :do_foobar
private
def do_foobar
rating_score = self.rating_score
ratings = self.ratings
rating = (rating_score/ratings)
self.update_attributes(:rating => rating)
end
end
我的 Rails 日志:
My rails log:
Started POST "/konkurrancers/rate/46" for 127.0.0.1 at 2011-04-26 23:40:56 +0200
Processing by KonkurrancersController#rate as */*
Parameters: {"utf8"=>"Ô£ô", "authenticity_token"=>"MACFM37hX4S6XA9vryn7gtfl21P
vcaPBSiKDI8mfurg=", "vind"=>{"rating"=>"4"}, "id"=>"46"}
←[1m←[36mKonkurrancer Load (1.0ms)←[0m ←[1mSELECT `konkurrancers`.* FROM `kon
kurrancers`←[0m
←[1m←[35mCACHE (0.0ms)←[0m SELECT `konkurrancers`.* FROM `konkurrancers`
←[1m←[36mCACHE (0.0ms)←[0m ←[1mSELECT `konkurrancers`.* FROM `konkurrancers`←
[0m
←[1m←[35mKonkurrancer Load (1.0ms)←[0m SELECT `konkurrancers`.* FROM `konkurr
ancers` WHERE (`konkurrancers`.`cached_slug` = '46') LIMIT 1
←[1m←[36mSQL (2.0ms)←[0m ←[1mSELECT sluggable_id FROM slugs WHERE ((slugs.slu
ggable_type = 'Konkurrancer' AND slugs.name = '46' AND slugs.sequence = 1))←[0m
←[1m←[35mKonkurrancer Load (1.0ms)←[0m SELECT `konkurrancers`.* FROM `konkurr
ancers` WHERE (`konkurrancers`.`id` = 46) LIMIT 1
←[1m←[36mSQL (0.0ms)←[0m ←[1mBEGIN←[0m
←[1m←[35mLink Load (1.0ms)←[0m SELECT `links`.* FROM `links` WHERE (`links`.k
onkurrancer_id = 46) LIMIT 1
←[1m←[36mSQL (0.0ms)←[0m ←[1mROLLBACK←[0m
Rendered konkurrancers/_rating.html.erb (1.0ms)
Rendered konkurrancers/rate.js.erb (22.0ms)
Completed 200 OK in 606ms (Views: 286.0ms | ActiveRecord: 6.0ms)
我应该如何创建它?
推荐答案
你想要的是回调.您可以在 Konkurrancer 模型上创建 after_save 回调,该回调在为该模型调用 save() 方法后触发.
what you want is a callback. You can create an after_save callback on your Konkurrancer model, which triggers after the save() method is called for that model.
例如:
class Konkurrancer < ActiveRecord::Base
after_save :do_foobar
private
def do_foobar
rating_score = self.rating_score
ratings = self.ratings
rating = (rating_score/ratings)
self.update_attributes(:ratings => rating)
end
end
您应该使用 self,因为您正在编辑的模型就是模型本身.对其进行测试,并应用必要的逻辑/实现.
You should use self, since the model you are editing is the model itself. Test it out, and apply necessary logic/implementation.
查看此指南了解更多信息.
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