method

inverse_which_updates_counter_cache

v6.1.3.1 - Show latest stable - 0 notes - Class: AbstractReflection

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What's this?

inverse_which_updates_counter_cache() public

This shit is nasty. 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 250
      def inverse_which_updates_counter_cache
        return @inverse_which_updates_counter_cache if defined?(@inverse_which_updates_counter_cache)
        @inverse_which_updates_counter_cache = klass.reflect_on_all_associations(:belongs_to).find do |inverse|
          inverse.counter_cache_column == counter_cache_column
        end
      end

inverse_which_updates_counter_cache

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