added test which fails without the fix

with error: `no such column: model2.model2_prop2`

tests/integration/find.js

@@ -301,6 +301,27 @@ module.exports = (session) => {
  });
  });
 
+ it('.where() with a subquery and aliases (using tableRefFor in subquery)', () => {
+ return Model2.query()
+ .alias('m1')
+ .where((query) =>
+ query.where(
+ 'id_col',
+ Model2.query()
+ .select('m2.id_col')
+ .alias('m2')
+ .where(
+ 'm2.model2_prop2',
+ ref(`${query.tableRefFor(query.modelClass())}.model2_prop2`)
+ )
+ )
+ )
+ .orderBy('m1.model2_prop2')
+ .then((models) => {
+ expect(_.map(models, 'model2Prop2').sort()).to.eql([10, 20, 30]);
+ });
+ });
+
  it('.where() with an object and knex query builder', () => {
  return Model2.query()
  .where({