使用Node.js在MongoDB中插入一个深层文档

Question

I'm trying to insert a city into a states array inner a country array, it is a bit confusing for me. I'm using MEAN. This is the MongoDB model:

var countrySchema = {
    countryName: { type: String, required: true },
    loc: [{ type: Number, required: true }],
    states: [{
        stateName: { type: String, required: true },
        loc: [{ type: Number, required: true }],
        cities: [{
            cityName: { type: String, required: true },
            loc: [{type: Number, required: true}]
        }]
    }]
};

When I insert a new City, I need update cities inner states and push another one.

I'm using POST metod, and this looks like this:

 api.post('/city/', wagner.invoke(function (Location) { return function (req, res) { return require('./Controllers/locationController').newCity(req, res, Location); }; })); 

And is this newCity function:

 module.exports.newCity = function (req, res, Location) { try { var locations = req.body.locations; } catch (error) { return res.status(status.BAD_REQUEST).json({error: error.toString()}); } Location.update({"countryName": locations.countryName, "states.stateName": locations.states.stateName}, {'$push': {'cities': locations.states.cities}}, function (error, city) { if (error) { return res.status(status.INTERNAL_SERVER_ERROR).json({error: error.toString()}); } if (!city) { return res.status(status.NOT_FOUND).json({error: error.toString()}); } res.json({city: city}) }); }; 

Most probably that the query on the update function is misconceived.

I'm sending the following JSON as a request:

 { "locations": { "countryName": "Mexico", "loc": [1, 2], "states": { "stateName": "test one", "loc": [1, 2], "cities": { "cityName": "City for test one", "loc": [1, 2] } } } } 

And I get this response:

{
    "city": {
        "ok": 0
        "n": 0
        "nModified": 0
    }
}

Answer 1

I solved my problem with projection operator , I didn't know it, but I researched.

The solution looks like that:

module.exports.newCity = function (req, res, Location) {
    try {
        var locations = req.body.locations;
    } catch (error) {
        return res.status(status.BAD_REQUEST).json({error: error.toString()});
    }
    Location.update({
        "countryName": locations.countryName,
        'states.stateName': locations.states.stateName
    }, {
        '$push': {
            'states.$.cities': locations.states.cities
        }
    }, function (error, city) {
        if (error) {
            return res.status(status.INTERNAL_SERVER_ERROR).json({error: error.toString()});
        }
        if (!city) {
            return res.status(status.NOT_FOUND).json({error: error.toString()});
        }
        res.json({city: city});
    });
};