I need to select users with dogs (pets with type equal 'dog')
var User = Waterline.Collection.extend({
identity: 'user',
attributes: {
firstName: 'string',
lastName: 'string',
pets: {
collection: 'pet',
via: 'owner'
}
}
});
var Pet = Waterline.Collection.extend({
identity: 'pet',
attributes: {
type: 'string',
name: 'string',
owner: {
model: 'user'
}
}
});
I didn't find any examples, I tried like this
User.find().populate('pets', {type: 'dog'}).exec(err, users) ...
and this
User.find().where({'pets.type': 'dog'}).populate('pets').exec(err, users) ...
but that does not work
Would be greate if result users array will has no pets records
Did you try this?
User.find().populate('pets', {
where: {
type: 'dog'
}
}).exec(err, users)...
What you are looking for hasn't been implemented in waterline (Sails ORM) yet, check issue #266 for more details.
User.find().populate('pets', {type: 'dog'}).exec(err, users) ...
This will return all users (User.find()) and only populate pets of type dog (populate('pets', {type: 'dog'})). So you'll have users without dogs in your results.
User.find().where({'pets.type': 'dog'}).populate('pets').exec(err, users) ...
Waterline does not support dot (.) notation. Sails-mongo does have some support for it due to MongoDB support.
Finally, if you are using one of the SQL adapters you may work around this by doing a raw sql query using .query() (docs).
If you don't need to query users and just need the query for dogs. You could just as easily reverse the query.
Pet.find({type: 'dog'}).populate('users').exec(err, petsWithUsers)
来源：https://stackoverflow.com/questions/30225945/sails-js-populate-with-where