Mongoose is looking for FindOne with a few arguments

Question

My first attempt to create something using Angular + express + mongodb, so I'm probably wrong about that. Express is used to serve json. Angular, then take care of all the views, etc.

I use Mongoose to interact with Mongo.

I have the following database schema:

var categorySchema = new mongoose.Schema({
  title: String, // this is the Category title
  retailers : [ 
    {
      title: String,  // this is the retailer title
      data: {       // this is the retailers Data
        strapLine: String,
        img: String ,  // this is the retailer image
        intro: String,
        website: String,
        address: String,
        tel: String,
        email: String
      } 
    }
  ]
});

var Category = mongoose.model('Category', categorySchema);

and in Express, I have several ways to get data:

 app.get('/data/categories', function(req, res) {
   // Find all Categories.
   Category.find(function(err, data) {
     if (err) return console.error(err);
     res.json(data)
   });
 });


 // return a list of retailers belonging to the category
 app.get('/data/retailer_list/:category', function(req, res) {
   //pass in the category param (the unique ID), and use that to do our retailer lookup
   Category.findOne({ _id: req.params.category }, function(err, data) {
     if (err) return console.error(err);
     res.json(data)
   }); 
 });

The above jobs - I just have big problems trying to get into one retailer. I pass the category and retailer ID ... I tried all kinds of things - from searching in a category, and then from findOne from the contents inside ... but I just can't get it to work. I'm probably wrong ...

: findOne Subdocument Mongoose - , , .

// Returns a single retailer
app.get('/data/retailer_detail/:category/:id', function(req, res) {
  //pass in the category param (the unique ID), and use that to do our retailer lookup
 Category.findOne({_id: req.params.category , 'retailers.$': 1}, function(err, data) {
    console.log(data);
    if (err) return console.error(err);
    res.json(data)
  }); 
});    

, Rob

Answer 1

, /, :

app.get('/data/retailer_detail/:category/:id', function(req, res) {
  //pass in the category param (the unique ID), and use that to do our retailer lookup
 Category.findOne({
    /* query */
    _id: req.params.category , 
    'retailers._id' : req.params.id
  },
  {  /* projection */
     "retailers.$" : 1 
  }, 
  function(err, data) {
  var retailer = _.where(data.retailers , { id : req.params.id });
    if (err) return console.error(err);
    res.json(retailer)
  }); 
}); 

{ "retailers.$" : 1 } . $ .

Answer 2

Mongo + Express : , , underscore.js .

, , . , "retailers._id": req.params.id}, , , , . , ... - ... , , - :)

app.get('/data/retailer_detail/:category/:id', function(req, res) {
  //pass in the category param (the unique ID), and use that to do our retailer lookup
 Category.findOne({_id: req.params.category , 'retailers._id' : req.params.id}, function(err, data) {
  var retailer = _.where(data.retailers , { id : req.params.id });
    if (err) return console.error(err);
    res.json(retailer)
  }); 
});