fix(data-types): fix regression with DECIMAL(N, undefined). closes #3119

changelog.md

 # Next
 - [BUG] Fixed regression with `DataTypes.ARRAY(DataTypes.STRING(length))` #3106
 - [BUG] Fixed regression where `.or([{key: value}, {key: value, key2: value}])` would result in 3 `A OR B OR C` rather than `A OR (B AND C)` #3107
+- [BUG] Fixed regression with `DataTypes.DECIMAL(10)` resulting in `10, undefined` #3119
 
 # 2.0.1
 - [BUG] Fixed issue with empty `include.where`

lib/data-types.js

 'use strict';
 
-var util = require('util');
+var util = require('util')
+  , _ = require('lodash');
 
 var ABSTRACT = function(options) {
 
@@ -204,7 +205,7 @@ util.inherits(DECIMAL, NUMBER);
 DECIMAL.prototype.key = DECIMAL.key = 'DECIMAL';
 DECIMAL.prototype.toSql = function() {
   if (this._precision || this._scale) {
-    return 'DECIMAL(' + this._precision + ',' + this._scale + ')';
+    return 'DECIMAL(' + [this._precision, this._scale].filter(_.identity).join(',') + ')';
   }
 
   return 'DECIMAL';

test/unit/sql/data-types.test.js

@@ -254,6 +254,9 @@ suite(Support.getTestDialectTeaser('SQL'), function() {
         default: 'DECIMAL(10,2)'
       });
 
+      testsql('DECIMAL(10)', DataTypes.DECIMAL(10), {
+        default: 'DECIMAL(10)'
+      });
     });
 
     suite('BLOB', function () {