method

inverse_updates_counter_cache?

v3.1.0 - Show latest stable - 0 notes - Class: ActiveRecord::Associations::HasManyAssociation

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What's this?

inverse_updates_counter_cache?(reflection = reflection) private

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/associations/has_many_association.rb, line 79
        def inverse_updates_counter_cache?(reflection = reflection)
          counter_name = cached_counter_attribute_name(reflection)
          reflection.klass.reflect_on_all_associations(:belongs_to).any? { |inverse_reflection|
            inverse_reflection.counter_cache_column == counter_name
          }
        end

inverse_updates_counter_cache?

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