Skip callbacks on Factory Girl and Rspec

Question

I\'m testing a model with an after create callback that I\'d like to run only on some occasions while testing. How can I skip/run callbacks from a factory?

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Answer 1

Here's a snippet I created to handle this in a generic way.
It will skip every callback configured, including rails-related callbacks like before_save_collection_association, but it won't skip some needed to make ActiveRecord work ok, like autogenerated autosave_associated_records_for_ callbacks.

# In some factories/generic_traits.rb file or something like that
FactoryBot.define do
  trait :skip_all_callbacks do
    transient do
      force_callbacks { [] }
    end

    after(:build) do |instance, evaluator|
      klass = instance.class
      # I think with these callback types should be enough, but for a full
      # list, check `ActiveRecord::Callbacks::CALLBACKS`
      %i[commit create destroy save touch update].each do |type|
        callbacks = klass.send("_#{type}_callbacks")
        next if callbacks.empty?

        callbacks.each do |cb|
          # Autogenerated ActiveRecord after_create/after_update callbacks like
          # `autosave_associated_records_for_xxxx` won't be skipped, also
          # before_destroy callbacks with a number like 70351699301300 (maybe
          # an Object ID?, no idea)
          next if cb.filter.to_s =~ /(autosave_associated|\d+)/

          cb_name = "#{klass}.#{cb.kind}_#{type}(:#{cb.filter})"
          if evaluator.force_callbacks.include?(cb.filter)
            next Rails.logger.debug "Forcing #{cb_name} callback"
          end

          Rails.logger.debug "Skipping #{cb_name} callback"
          instance.define_singleton_method(cb.filter) {}
        end
      end
    end
  end
end

then later:

create(:user, :skip_all_callbacks)

Needless to say, YMMV, so take a look in the test logs what are you really skipping. Maybe you have a gem adding a callback you really need and it will make your tests to fail miserably or from your 100 callbacks fat model you just need a couple for a specific test. For those cases, try the transient :force_callbacks

create(:user, :skip_all_callbacks, force_callbacks: [:some_important_callback])

BONUS

Sometimes you need also skip validations (all in a effort to make tests faster), then try with:

  trait :skip_validate do
    to_create { |instance| instance.save(validate: false) }
  end