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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"[email protected]_s
@konkurrancer.rating_score += params[:vind][:rating].to_i
@konkurrancer.ratings += 1
@konkurrancer.save
respond_to do |format|
format.js
end
end
end
This is my model:
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
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)
How should I create this?
610
Persisted means the object has been saved in the database. You can only call it on ActiveRecord objects.
save is an “Instance Method”, it returns either true or false depending on whether the object was saved successfully to the database or not. If the model is new, a record gets created in the database, otherwise the existing record gets updated.
If successfully validated, Create method creates an object (or multiple objects) and saves it to the database. The resulting object is returned whether the object was saved successfully to the database or not. From the above example, you can know that Create is a class method.
Any update_attribute in an after_save callback will cause recursion, in Rails3+.
What should be done is:
after_save :updater
# Awesome Ruby code
# ...
# ...
private
def updater
self.update_column(:column_name, new_value) # This will skip validation gracefully.
end
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