Add Lesson#projects and Project#lesson associations

Author: tuzz

app/models/lesson.rb

@@ -5,6 +5,7 @@ class Lesson < ApplicationRecord
   belongs_to :school_class, optional: true
   belongs_to :parent, optional: true, class_name: :Lesson, foreign_key: :copied_from_id, inverse_of: :copies
   has_many :copies, dependent: :nullify, class_name: :Lesson, foreign_key: :copied_from_id, inverse_of: :parent
+  has_many :projects, dependent: :nullify
 
   before_validation :assign_school_from_school_class
   before_destroy -> { throw :abort }

app/models/project.rb

@@ -2,6 +2,7 @@
 
 class Project < ApplicationRecord
   belongs_to :school, optional: true
+  belongs_to :lesson, optional: true
   belongs_to :parent, optional: true, class_name: :Project, foreign_key: :remixed_from_id, inverse_of: :remixes
   has_many :remixes, dependent: :nullify, class_name: :Project, foreign_key: :remixed_from_id, inverse_of: :parent
   has_many :components, -> { order(default: :desc, name: :asc) }, dependent: :destroy, inverse_of: :project

spec/models/lesson_spec.rb

@@ -29,6 +29,11 @@
       lesson = create(:lesson, copies: [build(:lesson), build(:lesson)])
       expect(lesson.copies.size).to eq(2)
     end
+
+    it 'has many projects' do
+      lesson = create(:lesson, projects: [build(:project), build(:project)])
+      expect(lesson.projects.size).to eq(2)
+    end
   end
 
   describe 'callbacks' do

spec/models/project_spec.rb

@@ -5,6 +5,7 @@
 RSpec.describe Project do
   describe 'associations', :sample_words do
     it { is_expected.to belong_to(:school).optional(true) }
+    it { is_expected.to belong_to(:lesson).optional(true) }
     it { is_expected.to belong_to(:parent).optional(true) }
     it { is_expected.to have_many(:remixes).dependent(:nullify) }
     it { is_expected.to have_many(:components) }