method

inverse_which_updates_counter_cache

Ruby on Rails latest stable (v7.1.3.2) - 0 notes - Class: AbstractReflection

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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

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