support dependent_nullify

lib/couchbase-orm/associations.rb

@@ -192,6 +192,7 @@ def destroy_associations!
       assoc = self.class.associations
       assoc.each do |name, dependent|
         next unless dependent
+        next if dependent == :nullify
 
         model = self.__send__(name)
         next unless model.present?

spec/has_many_spec.rb

@@ -126,4 +126,86 @@ class ObjectN1qlTest < CouchbaseOrm::Base
 
     include_examples('has_many example', context: :n1ql)
   end
+
+  describe 'dependent: :nullify on has_many' do
+    context 'with view' do
+      class RatingNullifyViewTest < CouchbaseOrm::Base
+        enum rating: [:awesome, :good, :okay, :bad], default: :okay
+        belongs_to :object_nullify_view_test
+        view :view_all
+      end
+
+      class ObjectNullifyViewTest < CouchbaseOrm::Base
+        attribute :name, type: String
+        has_many :rating_nullify_view_tests, dependent: :nullify
+        view :view_all
+      end
+
+      before :all do
+        RatingNullifyViewTest.ensure_design_document!
+        ObjectNullifyViewTest.ensure_design_document!
+        RatingNullifyViewTest.delete_all
+        ObjectNullifyViewTest.delete_all
+      end
+
+      after do
+        RatingNullifyViewTest.delete_all
+        ObjectNullifyViewTest.delete_all
+      end
+
+      it 'nullifies the foreign key and does not delete/destroy children' do
+        obj = ObjectNullifyViewTest.create! name: :bob
+        r1  = RatingNullifyViewTest.create! rating: :good,    object_nullify_view_test: obj
+        r2  = RatingNullifyViewTest.create! rating: :awesome, object_nullify_view_test: obj
+
+        expect { obj.destroy }.to change(ObjectNullifyViewTest, :count).by(-1)
+
+        # children still exist
+        reloaded_r1 = RatingNullifyViewTest.find(r1.id)
+        reloaded_r2 = RatingNullifyViewTest.find(r2.id)
+        expect(reloaded_r1).to be_present
+        expect(reloaded_r2).to be_present
+      end
+    end
+
+    context 'with n1ql' do
+      class RatingNullifyN1qlTest < CouchbaseOrm::Base
+        enum rating: [:awesome, :good, :okay, :bad], default: :okay
+        belongs_to :object_nullify_n1ql_test
+        n1ql :n1ql_all
+      end
+
+      class ObjectNullifyN1qlTest < CouchbaseOrm::Base
+        attribute :name, type: String
+        has_many :rating_nullify_n1ql_tests, dependent: :nullify, type: :n1ql
+        n1ql :n1ql_all
+      end
+
+      before :all do
+        RatingNullifyN1qlTest.ensure_design_document!
+        ObjectNullifyN1qlTest.ensure_design_document!
+        RatingNullifyN1qlTest.delete_all
+        ObjectNullifyN1qlTest.delete_all
+      end
+
+      after do
+        RatingNullifyN1qlTest.delete_all
+        ObjectNullifyN1qlTest.delete_all
+      end
+
+      it 'nullifies the foreign key and does not delete/destroy children' do
+        obj = ObjectNullifyN1qlTest.create! name: :jane
+        r1  = RatingNullifyN1qlTest.create! rating: :good,    object_nullify_n1ql_test: obj
+        r2  = RatingNullifyN1qlTest.create! rating: :awesome, object_nullify_n1ql_test: obj
+
+        expect { obj.destroy }.to change(ObjectNullifyN1qlTest, :count).by(-1)
+
+        # children still exist
+        reloaded_r1 = RatingNullifyN1qlTest.find(r1.id)
+        reloaded_r2 = RatingNullifyN1qlTest.find(r2.id)
+        expect(reloaded_r1).to be_present
+        expect(reloaded_r2).to be_present
+      end
+    end
+  end
 end