Sails js Query构建器

Question

我如何使用用户查询构建器？我需要创建查询

SELECT p.id, p.name, count(c.id) 
FROM parent p 
JOIN child c ON c.parent_id=p.id 
WHERE <criteria>
GROUP BY p.id

我想要像

这样的东西

var query = 'SELECT p.id, p.name, count(c.id) FROM parent p JOIN child c ON c.parent_id=p.id ' +
     where(request.where) +
     skip(request.skip) +
     limit(request.limit) +
     ' GROUP BY p.id'