let_it_be

let_it_be_ex.rb

require 'rails_helper'

RSpec.describe User, type: :model do
  context 'let!' do
    let!(:paul) { create(:user, first_name: 'Paul') }
    let!(:ringo) { create(:user, first_name: 'Ringo') }
    let!(:george) { create(:user, first_name: 'George') }
    let!(:john) { create(:user, first_name: 'John') }

    it { expect(paul.first_name).to eq('Paul') }
    it { expect(john.first_name).to eq('John') }
  end

  # => 8 records created

  context 'let_it_be' do
    let_it_be(:paul) { create(:user, first_name: 'Paul') }
    let_it_be(:ringo) { create(:user, first_name: 'Ringo') }
    let_it_be(:george) { create(:user, first_name: 'George') }
    let_it_be(:john) { create(:user, first_name: 'John') }

    it { expect(paul.first_name).to eq('Paul') }
    it { expect(john.first_name).to eq('John') }
  end

  # => only 4 records created
end