#2338 - Associations remove[AS][plural]

changelog.md

 # Next
 # Next
+- [FEATURE] Added the possibility of removing multiple associations in 1 call [#2338](https://github.com/sequelize/sequelize/issues/2338)
 - [BUG] Add support for `field` named the same as the attribute in `reload`, `bulkCreate` and `save` [#2348](https://github.com/sequelize/sequelize/issues/2348)
 - [BUG] Add support for `field` named the same as the attribute in `reload`, `bulkCreate` and `save` [#2348](https://github.com/sequelize/sequelize/issues/2348)
 - [BUG] Copy the options object in association getters. [#2311](https://github.com/sequelize/sequelize/issues/2311)
 - [BUG] Copy the options object in association getters. [#2311](https://github.com/sequelize/sequelize/issues/2311)
 - [BUG] `Model#destroy()` now supports `field`, this also fixes an issue with `N:M#removeAssociation` and `field`
 - [BUG] `Model#destroy()` now supports `field`, this also fixes an issue with `N:M#removeAssociation` and `field`

lib/associations/has-many.js

@@ -176,6 +176,7 @@ module.exports = (function() {
       add: 'add' + singular,
       add: 'add' + singular,
       create: 'create' + singular,
       create: 'create' + singular,
       remove: 'remove' + singular,
       remove: 'remove' + singular,
+      removeMultiple: 'remove' + plural,
       hasSingle: 'has' + singular,
       hasSingle: 'has' + singular,
       hasAll: 'has' + plural
       hasAll: 'has' + plural
     };
     };
@@ -483,6 +484,29 @@ module.exports = (function() {
       });
       });
     };
     };
 
 
+    obj[this.accessors.removeMultiple] = function(oldAssociatedObjects, options) {
+      var instance = this;
+      return instance[association.accessors.get]({}, options).then(function(currentAssociatedObjects) {
+        var newAssociations = [];
+
+        currentAssociatedObjects.forEach(function(association) {
+
+          // Determine is this is an association we want to remove
+          var obj = Utils._.find(oldAssociatedObjects, function(oldAssociatedObject) {
+            return Utils._.isEqual(oldAssociatedObject.identifiers, association.identifiers);
+          });
+
+          // This is not an association we want to remove. Add it back
+          // to the set of associations we will associate our instance with
+          if (!obj) {
+            newAssociations.push(association);
+          }
+        });
+
+        return instance[association.accessors.set](newAssociations, options);
+      });
+    };
+
     return this;
     return this;
   };
   };
 
 

lib/associations/mixin.js

@@ -187,7 +187,8 @@ Mixin.belongsTo = singleLinked(BelongsTo);
  * * add[AS] - for example addPicture(instance, defaultAttributes|options). Add another associated object.
  * * add[AS] - for example addPicture(instance, defaultAttributes|options). Add another associated object.
  * * add[AS] [plural] - for example addPictures([instance1, instance2], defaultAttributes|options). Add some more associated objects.
  * * add[AS] [plural] - for example addPictures([instance1, instance2], defaultAttributes|options). Add some more associated objects.
  * * create[AS] - for example createPicture(values, options). Build and save a new association.
  * * create[AS] - for example createPicture(values, options). Build and save a new association.
- * * remove[AS] - for example removePicture(instance). Remove a single association
+ * * remove[AS] - for example removePicture(instance). Remove a single association.
+ * * remove[AS] [plural] - for example removePictures(instance). Remove multiple association.
  * * has[AS] - for example hasPicture(instance). Is source associated to this target?
  * * has[AS] - for example hasPicture(instance). Is source associated to this target?
  * * has[AS] [plural] - for example hasPictures(instances). Is source associated to all these targets?
  * * has[AS] [plural] - for example hasPictures(instances). Is source associated to all these targets?
  *
  *

test/associations/has-many.test.js

@@ -1986,6 +1986,34 @@ describe(Support.getTestDialectTeaser("HasMany"), function() {
             expect(tasks.length).to.equal(1);
             expect(tasks.length).to.equal(1);
           });
           });
         });
         });
+
+        it('should remove multiple entries without any attributes (and timestamps off) on the through model', function () {
+          var Worker = this.sequelize.define('Worker', {}, {timestamps: false})
+            , Task = this.sequelize.define('Task', {}, {timestamps: false})
+            , WorkerTasks = this.sequelize.define('WorkerTasks', {}, {timestamps: false});
+
+          Worker.hasMany(Task, { through: WorkerTasks });
+          Task.hasMany(Worker, { through: WorkerTasks });
+
+          // Test setup
+          return this.sequelize.sync().then(function() {
+            return Sequelize.Promise.all([
+              Worker.create({}),
+              Task.bulkCreate([{}, {}, {}]).then(function () {
+                return Task.findAll();
+              })
+            ]);
+          }).spread(function (worker, tasks) {
+            // Set all tasks, then remove two tasks, then return all tasks
+            return worker.setTasks(tasks).then(function () {
+              return worker.removeTasks([tasks[0], tasks[1]]);
+            }).then(function () {
+              return worker.getTasks();
+            });
+          }).then(function (tasks) {
+            expect(tasks.length).to.equal(1);
+          });
+        });
       });
       });
     });
     });
 
 

test/mysql/associations.test.js

@@ -137,7 +137,12 @@ if (Support.dialectIsMySQL()) {
                 self.user.removeTask(self.tasks[0]).on('success', function() {
                 self.user.removeTask(self.tasks[0]).on('success', function() {
                   self.user.getTasks().on('success', function(_tasks) {
                   self.user.getTasks().on('success', function(_tasks) {
                     expect(_tasks.length).to.equal(self.tasks.length - 1)
                     expect(_tasks.length).to.equal(self.tasks.length - 1)
-                    done()
+                    self.user.removeTasks([self.tasks[1], self.tasks[2]]).on('success', function() {
+                      self.user.getTasks().on('success', function(_tasks) {
+                        expect(_tasks).to.have.length(self.tasks.length - 3)
+                        done()
+                      })
+                    })
                   })
                   })
                 })
                 })
               })
               })

test/postgres/associations.test.js

@@ -151,7 +151,12 @@ if (dialect.match(/^postgres/)) {
                           self.user.removeTask(self.tasks[0]).on('success', function() {
                           self.user.removeTask(self.tasks[0]).on('success', function() {
                             self.user.getTasks().on('success', function(_tasks) {
                             self.user.getTasks().on('success', function(_tasks) {
                               expect(_tasks).to.have.length(self.tasks.length - 1)
                               expect(_tasks).to.have.length(self.tasks.length - 1)
-                              done()
+                              self.user.removeTasks([self.tasks[1], self.tasks[2]]).on('success', function() {
+                                self.user.getTasks().on('success', function(_tasks) {
+                                  expect(_tasks).to.have.length(self.tasks.length - 3)
+                                  done()
+                                })
+                              })
                             })
                             })
                           })
                           })
                         })
                         })