diff options
Diffstat (limited to 'activerecord/lib/active_record/associations.rb')
| -rw-r--r-- | activerecord/lib/active_record/associations.rb | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/associations.rb b/activerecord/lib/active_record/associations.rb index 60b7118d7e..258d602afa 100644 --- a/activerecord/lib/active_record/associations.rb +++ b/activerecord/lib/active_record/associations.rb @@ -950,6 +950,11 @@ module ActiveRecord # specific association types. When no option is given, the behaviour is to do nothing # with the associated records when destroying a record. # + # Note that <tt>:dependent</tt> is implemented using Rails' callback + # system, which works by processing callbacks in order. Therefore, other + # callbacks declared either before or after the <tt>:dependent</tt> option + # can affect what it does. + # # === Delete or destroy? # # +has_many+ and +has_and_belongs_to_many+ associations have the methods <tt>destroy</tt>, @@ -1095,7 +1100,10 @@ module ActiveRecord # Specify the method that returns the primary key used for the association. By default this is +id+. # [:dependent] # Controls what happens to the associated objects when - # their owner is destroyed: + # their owner is destroyed. Note that these are implemented as + # callbacks, and Rails executes callbacks in order. Therefore, other + # similar callbacks may affect the :dependent behavior, and the + # :dependent behavior may affect other callbacks. # # * <tt>:destroy</tt> causes all the associated objects to also be destroyed # * <tt>:delete_all</tt> causes all the asssociated objects to be deleted directly from the database (so callbacks will not execute) |