Model related via belongsTo is not available via REST

[bajtos]

Consider the following setup: "Product belongsTo Category".

For a product with id 1, one can get the category it belongs to via

Product.findById(1, function(err, prod) {
  prod.category(function(err, cat) {
    // see "cat"
  });
});

The method is not exposed via the REST API, although it should be.

GET /products/1/category
404 Not Found

The primary reason is that the relation function is not enumerable (code).

Note that changing 'enumerable' to true is not enough, as the method is invoked with a wrong "this" argument when called via remoting.

@raymondfeng I am wondering how did you test the pull request #86 which was supposed to fix the issue?

[raymondfeng]

@bajtos Please clarify if you refer to hasAndBelongsToMany or belongsTo. They are two different relations. I only fixed the remoting for belongsTo.

[bajtos]

I am referring to belongsTo, hasAndBelongsToMany works fine.

Here is my sample app:

var loopback = require('loopback');
var request = require('supertest');
var app = loopback();

app.dataSource('db', { connector: 'memory' });

var Category = app.model('Category', {
  properties: { name: 'string' },
  dataSource: 'db'
});

var Product = app.model('Product', {
  properties: { name: 'string' },
  options: {
    relations: {
      category: {
        model: 'Category',
        type: 'belongsTo',
      }
    }
  },
  dataSource: 'db'
});

app.use(loopback.rest());

Category.create({ name: 'a-cat' }, function(err, cat) {
  if (err) throw err;
  console.log('created category', cat);

  Product.create({ name: 'a-prod', categoryId: cat.id }, function (err, prod) {
    if (err) throw err;
    console.log('created product', prod);

    prod.category(function(err, cat2) {
      if (err) throw err;
      console.log('product\'s category', cat2);

      request(app)
        .get('/products/' + prod.id + '/category?refresh=true')
        .end(function(err, res) {
          if (err) throw err;
          console.log('REST response', res.statusCode);
          console.log(res.body);
          process.exit();
        });
    });
  });
});

The output:

created category { name: 'a-cat', id: 1 }
created product { name: 'a-prod',
  categoryId: 1,
  id: 1 }
product's category { name: 'a-cat', id: 1 }
REST response 404
{ error:
   { name: 'Error',
     status: 404,
     message: 'Shared class "Product" has no method handling GET /1/category?refresh=true',
     statusCode: 404,
     stack: '...'
  }
}

[fabien]

@bajtos given strongloop/loopback#224 - can we close this?

[bajtos]

Yes, I am closing the issue as resolved.