Join table fields as a single JSON object - php

Question

I am building API. I ran into issue when building responses such as this one:
{
"id": 1,
"name": "Some name",
"my_joined_table": {
"joined_table_id": "10",
"some_joined_table_field": "some value"
}
},
Joining tables as described in https://laravel.com/docs/5.2/queries would yield result such as:
{
"id": 1,
"name": "Some name",
"joined_table_id": "10",
"some_joined_table_field": "some value"
},
Instead of using join I could just run two queries, one for main table, second one for secondary and then just append second array to first one and spit JSON response, but it's a lot of queries and appending if list is big!
Example code which yields second result in pseudo-code:
$data = Model::select('id', 'name', 'my_joined_table.id as joined_table_id', 'my_joined_table.some_value some_value')
->leftJoin('my_joined_table', function($join) { //conditions_callback
})->get();
return response()->json($data);
Please advice.
EDIT2:
It seems that I can use with as follows:
$data = Model::with('my_second_table')->first();
return response()->json($data);
It does what I want, only the problem, that I cannot specify fields for both first and second tables using ->first($fields) and->with(['my_second_table' => function ($query) { $query->select('id', 'some_value'); }]) unless I specify primary key of second table in ->first($fields). How do I work around this?
TL;DR; Issue: http://laravel.io/bin/YyVjd

Answer 1

You can probably use Laravel Eloquent relationship to achieve it.
https://laravel.com/docs/5.2/eloquent-relationships#one-to-many
Or you can remap the returned data to a new response object using $appends.
Try something here,
http://laraveldaily.com/why-use-appends-with-accessors-in-eloquent/
This is just some clues and there is a lots work to do.
FYI, you can set $visible in your model to specify which attributes is visible.