[back_assignments] add reverse_association on collections

lib/couchrest/model/associations.rb

@@ -247,49 +247,37 @@ def initialize(array, property, parent)
       end
 
       def << obj
-        check_obj(obj)
-        casted_by[casted_by_property.to_s] << obj.id
-        obj.set_back_association(casted_by, casted_by.class.name)
-        casted_by.register_dirty_association(obj)
+        add_to_collection_with(:<<, obj)
         super(obj)
       end
 
       def push(obj)
-        check_obj(obj)
-        casted_by[casted_by_property.to_s].push obj.id
-        obj.set_back_association(casted_by, casted_by.class.name)
-        casted_by.register_dirty_association(obj)
+        add_to_collection_with(:push, obj)
         super(obj)
       end
 
       def unshift(obj)
-        check_obj(obj)
-        casted_by[casted_by_property.to_s].unshift obj.id
-        obj.set_back_association(casted_by, casted_by.class.name)
-        casted_by.register_dirty_association(obj)
+        add_to_collection_with(:unshift, obj)
         super(obj)
       end
 
       def []= index, obj
-        check_obj(obj)
-        casted_by[casted_by_property.to_s][index] = obj.id
-        obj.set_back_association(casted_by, casted_by.class.name)
-        casted_by.register_dirty_association(obj)
+        add_to_collection_with(:[]=, obj, index)
         super(index, obj)
       end
 
       def pop
         obj = casted_by.send(casted_by_property.options[:proxy_name]).last
         casted_by[casted_by_property.to_s].pop
-        obj.set_back_association(nil, casted_by.class.name)
+        obj.set_back_association(nil, casted_by.class.name, casted_by_property.options[:reverse_association])
         casted_by.register_dirty_association(obj)
         super
       end
 
       def shift
         obj = casted_by.send(casted_by_property.options[:proxy_name]).first
         casted_by[casted_by_property.to_s].shift
-        obj.set_back_association(nil, casted_by.class.name)
+        obj.set_back_association(nil, casted_by.class.name, casted_by_property.options[:reverse_association])
         casted_by.register_dirty_association(obj)
         super
       end
@@ -300,6 +288,15 @@ def check_obj(obj)
         raise "Object cannot be added to #{casted_by.class.to_s}##{casted_by_property.to_s} collection unless saved" if obj.new?
       end
 
+      def add_to_collection_with(method, obj, index=nil)
+        check_obj(obj)
+        args = [ obj.id ]
+        args = args.insert(0, index) if index
+        casted_by[casted_by_property.to_s].send(method, *args)
+        obj.set_back_association(casted_by, casted_by.class.name, casted_by_property.options[:reverse_association])
+        casted_by.register_dirty_association(obj)
+      end
+
       # Override CastedArray instantiation_and_cast method for a simpler
       # version that will not try to cast the model.
       def instantiate_and_cast(obj, change = true)

spec/fixtures/models/parent.rb

@@ -7,4 +7,5 @@ class  Parent < CouchRest::Model::Base
   belongs_to :lives_with, :class_name => :parent, :reverse_association => :lives_with
 
   collection_of :children, :class_name => 'Kid'
+  collection_of :pets , :reverse_association => :owner
 end

spec/unit/assocations_dual_spec.rb

@@ -5,8 +5,9 @@
 
   let(:father) { Parent.create(name: 'Bob')}
   let(:can_fly){ SuperPower.create(description: 'Can fly when there is no cloud')}
-  let(:mummy)  { Parent.create(   name: 'Claire')}
-  let(:kid)    { Kid.create(    name: 'Vladimir')}
+  let(:mummy)  { Parent.create(name: 'Claire')}
+  let(:kid)    { Kid.create(   name: 'Vladimir')}
+  let(:dog)    { Pet.create(   name: 'Valdo' )}
 
   describe 'of type belongs_to' do
     context 'with the other side also belongs_to (1-1)' do
@@ -72,6 +73,12 @@
           father.children << kid
           kid.dad.should eq(father)
         end
+        context 'when reverse_association is specified' do
+          it 'should populate the belongs_to property' do
+            father.pets << dog
+            dog.owner.should eq(father)
+          end
+        end
         describe 'when object is saved' do
           it 'should also save other side' do
             father.children << kid
@@ -86,6 +93,12 @@
           father.children.push kid
           kid.dad.should eq(father)
         end
+        context 'when reverse_association is specified' do
+          it 'should populate the belongs_to property' do
+            father.pets.push dog
+            dog.owner.should eq(father)
+          end
+        end
         describe 'when object is saved' do
           it 'should also save other side' do
             father.children.push kid
@@ -100,6 +113,10 @@
           father.children.unshift kid
           kid.dad.should eq(father)
         end
+        it 'should populate the belongs_to property' do
+          father.pets.unshift dog
+          dog.owner.should eq(father)
+        end
         describe 'when object is saved' do
           it 'should also save other side' do
             father.children.unshift kid
@@ -114,6 +131,10 @@
           father.children[3]= kid
           kid.dad.should eq(father)
         end
+        it 'should populate the belongs_to property' do
+          father.pets[3] = dog
+          dog.owner.should eq(father)
+        end
         describe 'when object is saved' do
           it 'should also save other side' do
             father.children[4] = kid
@@ -129,6 +150,13 @@
           father.children.pop
           kid.dad.should be_nil
         end
+        context 'specifying reverse association' do
+          it 'should set nil the belongs_to property' do
+            father.pets.push dog
+            father.pets.pop
+            dog.owner.should be_nil
+          end
+        end
         describe 'when object is saved' do
           it 'should also save other side' do
             father.children.push kid
@@ -146,6 +174,13 @@
           father.children.shift
           kid.dad.should be_nil
         end
+        context 'specifying reverse association' do
+          it 'should set nil the belongs_to property' do
+            father.pets.push dog
+            father.pets.shift
+            dog.owner.should be_nil
+          end
+        end
         describe 'when object is saved' do
           it 'should also save other side' do
             father.children.push kid