fix(attribute/field): provide better field support for postgres instance destroy

lib/instance.js

@@ -738,14 +738,15 @@ module.exports = (function() {
         return self.Model.runHooks('beforeDestroy', self, options);
       }
     }).then(function() {
-      var identifier;
+      var where;
 
       if (self.Model._timestampAttributes.deletedAt && options.force === false) {
         self.dataValues[self.Model._timestampAttributes.deletedAt] = new Date();
         return self.save(_.extend(_.clone(options), {hooks : false}));
       } else {
-        identifier = self.__options.hasPrimaryKeys ? self.primaryKeyValues : { id: self.id };
-        return self.QueryInterface.delete(self, self.QueryInterface.QueryGenerator.addSchema(self.Model), identifier, options);
+        where = {};
+        where[self.Model.rawAttributes[self.Model.primaryKeyAttribute].field] = self.get(self.Model.primaryKeyAttribute, {raw: true});
+        return self.QueryInterface.delete(self, self.QueryInterface.QueryGenerator.addSchema(self.Model), where, _.defaults(options, {limit: null}));
       }
     }).tap(function(result) {
       // Run after hook

lib/model.js

@@ -252,6 +252,10 @@ module.exports = (function() {
       if (definition.hasOwnProperty('validate')) {
         self.Instance.prototype.validators[name] = definition.validate;
       }
+
+      if (definition.field === undefined) {
+        definition.field = name;
+      }
     });
 
     this._hasBooleanAttributes = !!this._booleanAttributes.length;

test/model/attributes/field.test.js

@@ -155,6 +155,22 @@ describe(Support.getTestDialectTeaser('Model'), function() {
               });
           });
         });
+
+        it('should support instance.destroy()', function () {
+          return this.User.create().then(function (user) {
+            return user.destroy();
+          });
+        });
+
+        it('should support Model.destroy()', function () {
+          return this.User.create().bind(this).then(function (user) {
+            return this.User.destroy({
+              where: {
+                id: user.get('id')
+              }
+            });
+          });
+        });
       });
 
       describe('field and attribute name is the same', function() {