Javascript 查询mongoose以执行连接
我有两个收藏设置,如下所示,Javascript 查询mongoose以执行连接,javascript,node.js,mongodb,express,mongoose,Javascript,Node.js,Mongodb,Express,Mongoose,我有两个收藏设置,如下所示,日期和街道 我想要实现的是,通过参数StreetName查询街道,并查找它的唯一ID,然后通过该ID查询其他集合以提取所有匹配的日期 我的路线设置为/wasteDate/:StreetName。以下是我所拥有的: model.js var DateSchema = new Schema({ date: { type: Date }, street_id: { type: String, } }); var StreetSchem
日期
和街道
我想要实现的是,通过参数StreetName
查询街道,并查找它的唯一ID,然后通过该ID查询其他集合以提取所有匹配的日期
我的路线设置为/wasteDate/:StreetName
。以下是我所拥有的:
model.js
var DateSchema = new Schema({
date: {
type: Date
},
street_id: {
type: String,
}
});
var StreetSchema = new Schema({
name: {
type: String
}
});
routes.js
module.exports = function(app) {
var wasteCollections = require('../controllers/wasteController');
app.route('/wasteDate/:streetName')
.get(wasteCollections.get_dates_by_street_name);
};
controller.js
var mongoose = require('mongoose'),
ColDate = mongoose.model('Dates'),
that = this,
Street = mongoose.model('Streets');
(……)
目前,我在JSON上得到了一个循环引用错误
我认为我做得不对,我可能需要修改我的模式
感谢任何帮助我从未使用过它,但我认为猫鼬模型可能会解决您的问题
另一种可能的方法是将第二个查询函数作为第一个查询函数的回调。我从未使用过它,但我认为mongoose模型可能会解决您的问题 另一种可能的方法是将第二个查询函数作为第一个查询函数的回调。您可以使用(1)
find
两次或(2)
第一种方法是:
exports.manual_get_dates_by_street = function (id, callback) {
// you are dealing with asynchronous operations, so you have to wait for the callback
// to execute before you can get the data
ColDate.find({ street_id: id }).lean().exec(callback);
};
exports.get_dates_by_street_name = function (req, res) {
// you are expecting one result, so use findOne instead of find
Street.findOne({ name: req.params.streetName }, function (err, street) {
// make sure you handle errors properly such as stopping execution of
// the next lines or else you may get unexpected errors
if (err)
return res.send(err);
// we pass a callback that will be executed once results (or an error) are found
that.manual_get_dates_by_street(street._id, function (err, dates) {
res.json({ dates: dates });
});
});
};
您可以使用(1)find
两次或(2)
第一种方法是:
exports.manual_get_dates_by_street = function (id, callback) {
// you are dealing with asynchronous operations, so you have to wait for the callback
// to execute before you can get the data
ColDate.find({ street_id: id }).lean().exec(callback);
};
exports.get_dates_by_street_name = function (req, res) {
// you are expecting one result, so use findOne instead of find
Street.findOne({ name: req.params.streetName }, function (err, street) {
// make sure you handle errors properly such as stopping execution of
// the next lines or else you may get unexpected errors
if (err)
return res.send(err);
// we pass a callback that will be executed once results (or an error) are found
that.manual_get_dates_by_street(street._id, function (err, dates) {
res.json({ dates: dates });
});
});
};
谢谢我请客了,谢谢。我请客了,谢谢。关于回调,您是对的,但我已经标记了另一个答案,因为它给出了完整的代码示例。谢谢。关于回调,您是对的,但我已经标记了另一个答案,因为它给出了完整的代码示例。