Save multiple models in loopback

Question

I'm doing research on loopback and was wondering if it's possible to save to multiple models from one request. Say.. an Post has many Tags with many Images. A user form would have the following:

• Post Title
• Post Description
• Tag Names (A multi field. E.g.: ['Sci-Fi', 'Fiction', 'BestSeller']
• Image File (Hoping to process the file uploaded to AWS, maybe with skipper-s3?)

How would I be able to persist on multiple models like this? Is this something you do with a hook?

Answer 1

You can create RemoteMethods in a Model, which can define parameters, so in your example you could create something like this in your Post model:

// remote method, defined below
Post.SaveFull = function(title, 
        description,
        tags,
        imageUrl,
        cb) {

    var models = Post.app.Models; // provides access to your other models, like 'Tags'

    Post.create({"title": title, "description": description}, function(createdPost) {
         foreach(tag in tags) {
             // do something with models.Tags

         }
         // do something with the image

         // callback at the end
         cb(null, {}); // whatever you want to return
    })

}

Post.remoteMethod(
    'SaveFull', 
    {
      accepts: [
          {arg: 'title', type: 'string'},
          {arg: 'description', type: 'string'},
          {arg: 'tags', type: 'object'},
          {arg: 'imageUrl', type: 'string'}
        ],
      returns: {arg: 'Post', type: 'object'}
    }
);