fix(include): fix issue with bad query generation on empty include.where, closes #3099

changelog.md

+# Next
+- [BUG] Fixed issue with empty `include.where`
+
 # 2.0.0
 - [BUG] Fixed `field` support for `increment` and `decrement`.
 - [FEATURE/BUG] Raw queries always return all results (including affected rows etc). This means you should change all promise listeners on `sequelize.query` to use `.spread` instead of `.then`, unless you are passing a query type.

lib/dialects/abstract/query-generator.js

@@ -905,7 +905,8 @@ module.exports = (function() {
             , through = include.through
             , joinType = include.required ? ' INNER JOIN ' : ' LEFT OUTER JOIN '
             , includeWhere = {}
-            , whereOptions = Utils._.clone(options);
+            , whereOptions = Utils._.clone(options)
+            , targetWhere;
 
           whereOptions.keysEscaped = true;
 
@@ -981,7 +982,6 @@ module.exports = (function() {
 
               , sourceJoinOn
               , targetJoinOn
-              , targetWhere
 
               , throughWhere;
 
@@ -1034,8 +1034,10 @@ module.exports = (function() {
             if (include.where || include.through.where) {
               if (include.where) {
                 targetWhere = self.getWhereConditions(include.where, self.sequelize.literal(self.quoteIdentifier(as)), include.model, whereOptions);
+                if (targetWhere) {
                   joinQueryItem += ' AND ' + targetWhere;
                 }
+              }
               if (subQuery && include.required) {
                 if (!options.where) options.where = {};
                 (function (include) {
@@ -1148,8 +1150,11 @@ module.exports = (function() {
             subQueryJoinOn += ' = ' + self.quoteTable(tableRight) + '.' + self.quoteIdentifier(attrRight);
 
             if (include.where) {
-              joinOn += ' AND ' + self.getWhereConditions(include.where, self.sequelize.literal(self.quoteIdentifier(as)), include.model, whereOptions);
-              subQueryJoinOn += ' AND ' + self.getWhereConditions(include.where, self.sequelize.literal(self.quoteIdentifier(as)), include.model, whereOptions);
+              targetWhere = self.getWhereConditions(include.where, self.sequelize.literal(self.quoteIdentifier(as)), include.model, whereOptions);
+              if (targetWhere) {
+                joinOn += ' AND ' + targetWhere;
+                subQueryJoinOn += ' AND ' + targetWhere;
+              }
             }
 
             // If its a multi association and the main query is a subquery (because of limit) we need to filter based on this association in a subquery

test/integration/include/findAll.test.js

@@ -2132,6 +2132,25 @@ describe(Support.getTestDialectTeaser('Include'), function() {
       });
     });
 
+    it('should work with an empty include.where', function () {
+      var User = this.sequelize.define('User', {})
+        , Company = this.sequelize.define('Company', {})
+        , Group = this.sequelize.define('Group', {});
+
+      User.belongsTo(Company);
+      User.belongsToMany(Group);
+      Group.belongsToMany(User);
+
+      return this.sequelize.sync({force: true}).then(function () {
+        return User.findAll({
+          include: [
+            {model: Group, where: {}},
+            {model: Company, where: {}}
+          ]
+        });
+      });
+    });
+
     it('should be able to order on the main table and a required belongsTo relation with custom tablenames and limit ', function () {
       var User = this.sequelize.define('User', {
         lastName: DataTypes.STRING