shoulda-matchers presence true on save

Question

model

class RecipeIngredient < ActiveRecord::Base
  validates :recipe_id, presence: true, on: :save
  validates :ingredient_id, presence: true, on: :save

  belongs_to :recipe
  belongs_to :ingredient

  has_many :quantities
 end

test

require 'spec_helper'

describe RecipeIngredient do
  it { should validate_presence_of(:recipe_id) }
  it { should validate_presence_of(:ingredient_id) }
    it { should belong_to(:recipe) }
    it { should belong_to(:ingredient) }

    context "valid" do
      subject { RecipeIngredient.new(recipe_id: 1, ingredient_id: 1) }
      it { should be_valid }
    end
end

returns

Failures:

1) RecipeIngredient Failure/Error: it { should validate_presence_of(:recipe_id) } Did not expect errors to include "can't be blank" when recipe_id is set to nil, got error: # ./spec/models/recipe_ingredient_spec.rb:4:in `block (2 levels) in '

2) RecipeIngredient Failure/Error: it { should validate_presence_of(:ingredient_id) } Did not expect errors to include "can't be blank" when ingredient_id is set to nil, got error: # ./spec/models/recipe_ingredient_spec.rb:5:in `block (2 levels) in '

I don't understand why adding on: :save has broken this test

Answer 1

First off, you don't need to put the on: :save clause. That is the default and can be left off.