raisl callback example

thing.rb

# frozen_String_literal: true

class Thing < ApplicationRecord
  validates :name, presence: true
	
  # can use before_create, before_save, before_update, after_save, after_create, 
  # after_update, before_validation, after_validation
  # also accepts if/unless
  before_save :set_bool #, if: proc { |thing| thing.name == 'TEST' }
	
  private
	
  def set_bool
    name == 'TEST' ? this.bool = true : this.bool = false
  end
end

thing_test.rb

# frozen_string_literal: true

require 'test_helper'

class ThingTest < ActiveSupport::TestCase
  test 'sets bool false' do
    thing = Thing.new(name: 'Test')
    thing.run_callbacks(:save)
    refute thing.bool
  end
  
  test 'sets bool true' do
    thing = Thing.new(name: 'TEST')
    thing.run_callbacks(:save)
    assert thing.bool
  end
end