Fix soft delete not returning affected rows on MSSQL (#6916)

Because the query type was not properly set when doing a soft delete, Sequelize tried to format the result in the wrong format: https://github.com/sequelize/sequelize/blob/cf232e76b46b7cb2fc98c455cc2010d520ca592d/lib/dialects/mssql/query.js#L186

changelog.md

+# Future
+- [FIXED] Soft-delete not returning number of affected rows on mssql [#6916](https://github.com/sequelize/sequelize/pull/6916)
+
 # 3.27.0
 # 3.27.0
 - [FIXED] Incorrect column name for generateThroughJoin [#6878](https://github.com/sequelize/sequelize/pull/6878)
 - [FIXED] Incorrect column name for generateThroughJoin [#6878](https://github.com/sequelize/sequelize/pull/6878)
 - [ADDED] Support condition objects in utility functions [#6685](https://github.com/sequelize/sequelize/pull/6685)
 - [ADDED] Support condition objects in utility functions [#6685](https://github.com/sequelize/sequelize/pull/6685)

lib/model.js

@@ -2298,8 +2298,12 @@ Model.prototype.destroy = function(options) {
       });
       });
     }
     }
   }).then(function() {
   }).then(function() {
+
     // Run delete query (or update if paranoid)
     // Run delete query (or update if paranoid)
     if (self._timestampAttributes.deletedAt && !options.force) {
     if (self._timestampAttributes.deletedAt && !options.force) {
+      // Set query type appropriately when running soft delete
+      options.type = QueryTypes.BULKUPDATE;
+
       var attrValueHash = {}
       var attrValueHash = {}
         , deletedAtAttribute = self.rawAttributes[self._timestampAttributes.deletedAt]
         , deletedAtAttribute = self.rawAttributes[self._timestampAttributes.deletedAt]
         , field = self.rawAttributes[self._timestampAttributes.deletedAt].field
         , field = self.rawAttributes[self._timestampAttributes.deletedAt].field

test/integration/model/paranoid.test.js

@@ -38,7 +38,10 @@ describe(Support.getTestDialectTeaser('Model'), function () {
         .then(function () { return Account.count(); })
         .then(function () { return Account.count(); })
         .then(function (count) {
         .then(function (count) {
           expect(count).to.be.equal(1);
           expect(count).to.be.equal(1);
-          return Account.destroy({ where: { ownerId: 12 }});
+          return Account.destroy({ where: { ownerId: 12 }})
+          .then(function (result) {
+            expect(result).to.be.equal(1);
+          });
         })
         })
         .then(function () { return Account.count(); })
         .then(function () { return Account.count(); })
         .then(function (count) {
         .then(function (count) {