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-rw-r--r--activerecord/lib/active_record/callbacks.rb49
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!],