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| author | Rafael França <rafaelmfranca@gmail.com> | 2017-01-06 04:39:31 -0500 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2017-01-06 04:39:31 -0500 |
| commit | b3bd6451b13307cfd2349b74191b10f99a607f66 (patch) | |
| tree | df3a9a911eaaddcfa1e555da0731763a8a622b99 /activerecord/lib/active_record/callbacks.rb | |
| parent | 5eff7a9ca7bb2ee7f16db1ab4d11cebe28757ba5 (diff) | |
| parent | 8f90e87b90e77bcde2a5e2e2f3764ed86a8f9639 (diff) | |
| download | rails-b3bd6451b13307cfd2349b74191b10f99a607f66.tar.gz rails-b3bd6451b13307cfd2349b74191b10f99a607f66.tar.bz2 rails-b3bd6451b13307cfd2349b74191b10f99a607f66.zip | |
Merge pull request #27294 from eavgerinos/doc-ar-callbacks-order
[documentation] ActiveRecord: Document order of Callbacks
Diffstat (limited to 'activerecord/lib/active_record/callbacks.rb')
| -rw-r--r-- | activerecord/lib/active_record/callbacks.rb | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/callbacks.rb b/activerecord/lib/active_record/callbacks.rb index be6720ddf3..eb44887e18 100644 --- a/activerecord/lib/active_record/callbacks.rb +++ b/activerecord/lib/active_record/callbacks.rb @@ -225,6 +225,55 @@ module ActiveRecord # # This way, the +before_destroy+ gets executed before the <tt>dependent: :destroy</tt> is called, and the data is still available. # + # Also, there are cases when you want several callbacks of the same type to + # be executed in order. + # + # For example: + # + # class Topic + # has_many :children + # + # after_save :log_children + # after_save :do_something_else + # + # private + # + # def log_chidren + # # Child processing + # end + # + # def do_something_else + # # Something else + # end + # end + # + # In this case the +log_children+ gets executed before +do_something_else+. + # The same applies to all non-transactional callbacks. + # + # In case there are multiple transactional callbacks as seen below, the order + # is reversed. + # + # For example: + # + # class Topic + # has_many :children + # + # after_commit :log_children + # after_commit :do_something_else + # + # private + # + # def log_chidren + # # Child processing + # end + # + # def do_something_else + # # Something else + # end + # end + # + # In this case the +do_something_else+ gets executed before +log_children+. + # # == \Transactions # # The entire callback chain of a {#save}[rdoc-ref:Persistence#save], {#save!}[rdoc-ref:Persistence#save!], |