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体验新版 GitCode,发现更多精彩内容 >>
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5e59265a
编写于
3月 30, 2018
作者:
A
Andrew White
提交者:
GitHub
3月 30, 2018
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Merge pull request #32384 from riseshia/remove-expired-document
Remove expired explanation [ci skip]
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99c44015
8f914053
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activerecord/lib/active_record/callbacks.rb
activerecord/lib/active_record/callbacks.rb
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activerecord/lib/active_record/callbacks.rb
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@@ -75,21 +75,7 @@ module ActiveRecord
# end
#
# Now, when <tt>Topic#destroy</tt> is run only +destroy_author+ is called. When <tt>Reply#destroy</tt> is
# run, both +destroy_author+ and +destroy_readers+ are called. Contrast this to the following situation
# where the +before_destroy+ method is overridden:
#
# class Topic < ActiveRecord::Base
# def before_destroy() destroy_author end
# end
#
# class Reply < Topic
# def before_destroy() destroy_readers end
# end
#
# In that case, <tt>Reply#destroy</tt> would only run +destroy_readers+ and _not_ +destroy_author+.
# So, use the callback macros when you want to ensure that a certain callback is called for the entire
# hierarchy, and use the regular overwritable methods when you want to leave it up to each descendant
# to decide whether they want to call +super+ and trigger the inherited callbacks.
# run, both +destroy_author+ and +destroy_readers+ are called.
#
# *IMPORTANT:* In order for inheritance to work for the callback queues, you must specify the
# callbacks before specifying the associations. Otherwise, you might trigger the loading of a
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