构建多对多关系的go-pg ORM查询

Question

我有3个表来表示我的多对多关系。客户、公司、companies_customers。

companies:
 - id
 - name

customers:
 - id
 - username

companies_customers:
 - id
 - customer_id
 - company_id

现在，我想要运行的查询是选择所有company_id为1的客户。

SELECT * FROM customers c INNER JOIN customers_companies cc ON c.id = cc.customer_id WHERE cc.company_id = 1

我试过在go-pg中做这样的事情：

var customers []*Customer

s.DB.Model(&customers).Relation("Companies", func(q *orm.Query) (*orm.Query, error) {
    return q.Where("company_id = ?", companyID), nil
}).Select()