mongodb - Meteor Collection.find 在动态 mongo 查询中使用变量作为字段

Question

我试图在 Collection.find 查询中使用变量作为字段说明符，但 tit 只是忽略了它

    var qry = "{\"" + field_name + "\":" + field_value + "}"
    console.log(qry)//  {"customer_active":true}
    Customers.find(qry).map(function(customer){// doesn't find anything
        console.log(customer)
        var groups = customer.customer_group_id.push(a._id)

        Customers.update({$set: {customer_group_id: groups}})
    })

如何构建动态查询

Answer 1

qry 需要是一个对象，而不是字符串。所以改为这样构建它:

var qry = {};
qry[field_name] = field_value;