diff options
Diffstat (limited to 'activerecord/lib/active_record/callbacks.rb')
| -rw-r--r-- | activerecord/lib/active_record/callbacks.rb | 25 |
1 files changed, 5 insertions, 20 deletions
diff --git a/activerecord/lib/active_record/callbacks.rb b/activerecord/lib/active_record/callbacks.rb index cfd8cbda67..1f1b11eb68 100644 --- a/activerecord/lib/active_record/callbacks.rb +++ b/activerecord/lib/active_record/callbacks.rb @@ -175,26 +175,11 @@ module ActiveRecord # end # end # - # The callback macros usually accept a symbol for the method they're supposed to run, but you can also - # pass a "method string", which will then be evaluated within the binding of the callback. Example: - # - # class Topic < ActiveRecord::Base - # before_destroy 'self.class.delete_all "parent_id = #{id}"' - # end - # - # Notice that single quotes (') are used so the <tt>#{id}</tt> part isn't evaluated until the callback - # is triggered. Also note that these inline callbacks can be stacked just like the regular ones: - # - # class Topic < ActiveRecord::Base - # before_destroy 'self.class.delete_all "parent_id = #{id}"', - # 'puts "Evaluated after parents are destroyed"' - # end - # # == <tt>before_validation*</tt> returning statements # # If the +before_validation+ callback throws +:abort+, the process will be # aborted and {ActiveRecord::Base#save}[rdoc-ref:Persistence#save] will return +false+. - # If {ActiveRecord::Base#save!}[rdoc-ref:Persistence#save!] is called it will raise a ActiveRecord::RecordInvalid exception. + # If {ActiveRecord::Base#save!}[rdoc-ref:Persistence#save!] is called it will raise an ActiveRecord::RecordInvalid exception. # Nothing will be appended to the errors object. # # == Canceling callbacks @@ -208,12 +193,12 @@ module ActiveRecord # # Sometimes the code needs that the callbacks execute in a specific order. For example, a +before_destroy+ # callback (+log_children+ in this case) should be executed before the children get destroyed by the - # <tt>dependent: destroy</tt> option. + # <tt>dependent: :destroy</tt> option. # # Let's look at the code below: # # class Topic < ActiveRecord::Base - # has_many :children, dependent: destroy + # has_many :children, dependent: :destroy # # before_destroy :log_children # @@ -228,7 +213,7 @@ module ActiveRecord # You can use the +prepend+ option on the +before_destroy+ callback to avoid this. # # class Topic < ActiveRecord::Base - # has_many :children, dependent: destroy + # has_many :children, dependent: :destroy # # before_destroy :log_children, prepend: true # @@ -238,7 +223,7 @@ module ActiveRecord # end # end # - # This way, the +before_destroy+ gets executed before the <tt>dependent: destroy</tt> is called, and the data is still available. + # This way, the +before_destroy+ gets executed before the <tt>dependent: :destroy</tt> is called, and the data is still available. # # == \Transactions # |