发布Mongoose复杂模式

Question

Hello there

I've got this Mongoose Schema (I know there is something wrong there), the important bit is the " region " part of it.

    const mongoose = require('mongoose');

    const destination = new mongoose.Schema({
      name: { type: String, required: true }, 
      flag: String,
      creationDate: { type: Date, default: Date.now },
      region: { id: { type: mongoose.Schema.Types.ObjectId, ref: 'Region' }, name: String },
}, {strict: true});

module.exports = mongoose.model('Destination', destination);

I'm posting using this form:

 <form action="/destinations" method="post"> <div class="form-group"> <label for="destination[name]">Name</label> <input class="form-control" type="text" name="destination[name]" placeholder="Destination name..."> </div> <div class="form-group"> <label for="destination[name]">Flag</label> <input class="form-control" type="text" name="destination[flag]" placeholder="Destination flag..."> </div> <div class="form-group"> <label for="destination[region]">Region</label> <select class="form-control mb-4" name="region[name]]"> <option selected disabled hidden>Choose a region</option> <% allRegions.forEach(region => { %> <option value="<%= region.name %>"> <%= region.name %> </option> <% }); %> </select> </div> <button class="btn btn-primary btn-block" type="submit">Add</button> </form> 

All data is being correctly posted to the Node.js file that processes it, however I can't find a way to save the "region id", this is how is being processed right now:

exports.destinations_create = (req, res) => {
  req.body.destination.region = { name: req.body.region.name };
  Destination.create(req.body.destination)
  .then(newDestination => {
    Regions.findOne({name: req.body.region.name})
    .then(foundRegion => {
      newDestination.region.id = foundRegion._id;
      foundRegion.countries.push(newDestination._id);
      foundRegion.save();
    });
    res.redirect('/destinations');
  })
  .catch(err => res.redirect('/'));
}

I thought I could leave the id empty and then add it later, as it is just an object, but nothing works, any ideas of what is wrong here?

Thanks in advance!

Answer 1

You could leave id as well as name property of region since you are referencing Region.

 const mongoose = require('mongoose');

     const destination = new mongoose.Schema({
      name: { type: String, required: true }, 
      flag: String,
      creationDate: { type: Date, default: Date.now },
      region: {type: mongoose.Schema.Types.ObjectId, ref: 'Region' });
      module.exports = mongoose.model('Destination', destination);

and then in your add method:

     exports.destination_create = async(req,res)=>{
    const region = await Region.findOne({name: req.body.region});
    const destination = new Destination({
     region: region._id,
    name: req.body.name,
    flag: req.body.flag
})
await destination.save();
res.redirect('/destination');
 }

Answer 2

I kinda found a solution, and I say kinda because I am not sure about how efficient it is memory wise but:

Model destination was changed:

region: { type: mongoose.Schema.Types.ObjectId, ref: 'Region' },

And then what I did was to " deep populate " the regions query:

Regions.find({})
  .select('_id name image countries')
  .populate({
    path: 'countries',
    model: 'Destination',
    populate: {
      path: 'cities',
      model: 'City'
    }
  }).then(...).catch(...);