Merge pull request #576 from CanCanCommunity/feature/has_and_belongs_…

…to_many

Add explicit test for HABTM associations

spec/cancan/model_adapters/has_and_belongs_to_many_spec.rb

@@ -0,0 +1,65 @@
+require 'spec_helper'
+
+RSpec.describe CanCan::ModelAdapters::ActiveRecord5Adapter do
+  let(:ability) { double.extend(CanCan::Ability) }
+  let(:users_table) { User.table_name }
+  let(:posts_table) { Post.table_name }
+
+  before :all do
+    connect_db
+    ActiveRecord::Migration.verbose = false
+
+    ActiveRecord::Schema.define do
+      create_table(:people) do |t|
+        t.string :name
+        t.timestamps null: false
+      end
+
+      create_table(:houses) do |t|
+        t.boolean :restructured, default: true
+        t.timestamps null: false
+      end
+
+      create_table(:houses_people) do |t|
+        t.integer :person_id
+        t.integer :house_id
+        t.timestamps null: false
+      end
+    end
+
+    class Person < ActiveRecord::Base
+      has_and_belongs_to_many :houses
+    end
+
+    class House < ActiveRecord::Base
+      has_and_belongs_to_many :people
+    end
+  end
+
+  before do
+    @person1 = Person.create!
+    @person2 = Person.create!
+    @house1 = House.create!(people: [@person1])
+    @house2 = House.create!(restructured: false, people: [@person1, @person2])
+    @house3 = House.create!(people: [@person2])
+    ability.can :read, House, people: { id: @person1.id }
+  end
+
+  describe 'fetching of records' do
+    it 'it retreives the records correctly' do
+      houses = House.accessible_by(ability)
+      expect(houses).to match_array [@house2, @house1]
+    end
+
+    if CanCan::ModelAdapters::ActiveRecordAdapter.version_greater_or_equal?('5.0.0')
+      it 'generates the correct query' do
+        expect(ability.model_adapter(House, :read))
+          .to generate_sql("SELECT DISTINCT \"houses\".*
+                          FROM \"houses\"
+                          LEFT OUTER JOIN \"houses_people\" ON \"houses_people\".\"house_id\" = \"houses\".\"id\"
+                          LEFT OUTER JOIN \"people\" ON \"people\".\"id\" = \"houses_people\".\"person_id\"
+                          WHERE \"people\".\"id\" = #{@person1.id}")
+      end
+    end
+  end
+end