method

inverse_which_updates_counter_cache

v7.1.3.4 - Show latest stable - 0 notes - Class: AbstractReflection

1.0.0
1.1.6
1.2.6
2.0.3
2.1.0
2.2.1
2.3.8
3.0.0
3.0.9
3.1.0
3.2.1
3.2.8
3.2.13
4.0.2
4.1.8
4.2.1
4.2.7
4.2.9
5.0.0.1 (0)
5.1.7 (0)
5.2.3 (0)
6.0.0 (0)
6.1.3.1 (0)
6.1.7.7 (0)
7.0.0 (-38)
7.1.3.2 (0)
7.1.3.4 (0)
What's this?

inverse_which_updates_counter_cache() public

We need to avoid the following situation:

* An associated record is deleted via record.destroy
* Hence the callbacks run, and they find a belongs_to on the record with a
  :counter_cache options which points back at our owner. So they update the
  counter cache.
* In which case, we must make sure to *not* update the counter cache, or else
  it will be decremented twice.

Hence this method.

Show source

# File activerecord/lib/active_record/reflection.rb, line 276
      def inverse_which_updates_counter_cache
        unless @inverse_which_updates_counter_cache_defined
          if counter_cache_column
            inverse_candidates = inverse_of ? [inverse_of] : klass.reflect_on_all_associations(:belongs_to)
            @inverse_which_updates_counter_cache = inverse_candidates.find do |inverse|
              inverse.counter_cache_column == counter_cache_column && (inverse.polymorphic? || inverse.klass == active_record)
            end
          end
          @inverse_which_updates_counter_cache_defined = true
        end
        @inverse_which_updates_counter_cache
      end

inverse_which_updates_counter_cache

Related methods