Ruby-on-rails Rails 4：跳过回调
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Rails 4: Skip callback
提问by Crazy Barney
I have an auction and a bid object in my application, when someone presses the BID BUTTONit then calls the BID CREATEcontroller which created the bid, and then does some other things on the auction object:
我的应用程序中有一个拍卖和一个出价对象，当有人按下BID 按钮时，它会调用创建出价的BID CREATE控制器，然后对拍卖对象执行一些其他操作：
BIDS CONTROLLER -> CREATE
投标控制器 -> 创建
@auction.endtime += @auction.auctiontimer
@auction.winner = @auction.arewinning
@auction.save
AUCTION MODEL
拍卖模式
before_update :set_endtime
def set_endtime
self.endtime=self.starttime+self.auctiontimer
end
So the question is: How can C skip the "before callback" only, in this specific @auction.save
所以问题是：在这个特定的@auction.save 中，C 如何仅跳过“回调之前”
回答by sites
skip_callbackis a complicated and not granular option.
skip_callback是一个复杂且不精细的选项。
I prefer to use an attr_accessor:
我更喜欢使用 attr_accessor：
attr_accessor :skip_my_method, :skip_my_method_2
after_save{ my_method unless skip_my_method }
after_save{ my_method_2 unless skip_my_method_2 }
That way you can be declarative when skipping a callback:
这样你就可以在跳过回调时声明：
model.create skip_my_method: true # skips my_method
model.create skip_my_method_2: true # skips my_method_2
回答by akusy
You can try skipping callback with skip_callback
您可以尝试使用 skip_callback 跳过回调
http://www.rubydoc.info/docs/rails/4.0.0/ActiveSupport/Callbacks/ClassMethods:skip_callback
http://www.rubydoc.info/docs/rails/4.0.0/ActiveSupport/Callbacks/ClassMethods:skip_callback
回答by Allerin
ActiveSupport::Callbacks::ClassMethods#skip_callback is not threadsafe, it will remove callback-methods for time till it is being executed and hence and another thread at same time cannot get the callback-methods for execution.
ActiveSupport::Callbacks::ClassMethods#skip_callback 不是线程安全的，它会移除回调方法直到它被执行，因此同时另一个线程无法获得回调方法来执行。
Look at the informative post by Allerin - SAVE AN OBJECT SKIPPING CALLBACKS IN RAILS APPLICATION
查看 Allerin 的信息性帖子 -在 RAILS 应用程序中保存对象跳过回调
回答by userxyz
You can use update_columns See this http://edgeguides.rubyonrails.org/active_record_callbacks.html#skipping-callbacks
您可以使用 update_columns 请参阅此http://edgeguides.rubyonrails.org/active_record_callbacks.html#skiping-callbacks
Is there any specific condition like when you don't have endtime then only you need to set end time if that the you can do
是否有任何特定条件，例如当您没有结束时间时，只有您可以设置结束时间
def set_endtime
if endtime.nil?
self.endtime=self.starttime+self.auctiontimer
end
end
OR
或者
before_update :set_endtime if: Proc.new { |obj| obj.endtime.nil? }
