Laravel getting users from multiple messages - laravel

Question

I've got offers table with id's
Messages table with columns offer_id and from
and Users table with id's
I want to get users starting with offer $this in OfferResource
My goal is to get users that have replied to the offer with at least one message.
I started to configure Offer model with function messages to get messages
public function messages(){
return $this -> hasMany('App\Message');
}
so I'm able to get all messages (starting from offer resource):
'users' => $this->messages
How should I now configure messages model to get all users instead of messages?
I tried to write in Message model :
public function fromContact()
{
return $this->hasOne(User::class, 'id', 'from');
}
and then:
'users' => $this->messages->fromContact
but i've got error: "message": "Property [fromContact] does not exist on this collection instance.",
How should I correct my code to make this work?

Answer 1

I am assuming the from field on the Messages table is populated using user ID. Then you could establish belongsToMany relationship between the Offer and User models. Since this is actually a many-to-many relation with a pivot table messages.
In the Offer model define
public function users()
{
return $this->belongsToMany('App\User', 'messages', 'offer_id', 'from');
}
Then from the OfferResource you could load the offers data like this—
$offers = App\Offer::with('users')->get();
Then loop over the $offers like this:
foreach ($offers as $offer) {
dd($offer->users); // one offer will have multiple users as a Collection
}
Similarly for an $offer of ID 1 you could do this
$offer = App\Offer::with('users')->find(1)
Then to get the users that commented on this offer just use $offer->users
See the official documentation for defining many-to-many relationship.

Answer 2

In the Message model you have to spesify the column that refer to the user :
public function fromContact()
{
return $this->hasOne(User::class, 'from');
}
And then after geting the messages loop over them to get the user like this :
foreach ($this->messages as $message) {
$user = $message->fromContact;
// do somthing with the user :)
}

Answer 3

Your messages table has from field that is referencing User model and offer_id field which referencing Offer model that means you have ManyToMany relations between Offer and User.
Offer Model
public function users(){
return $this->belongsToMany(User::class, 'messages', 'offer_id', 'from')->using('App\Message');
}
Message Pivot
class Message extends Pivot {
protected $table = 'messages';
}
User model
public function offers(){
return $this->belongsToMany(Offer::class, 'messages', 'from', 'offer_id')->using('App\Message');
}
OfferResource
public function toArray($request)
{
$users = $this->users;
return [
'id' => $this->id,
... //add your offer fields here
'users' => $users->toArray(), // here $users is a laravel Collection
'created_at' => $this->created_at,
'updated_at' => $this->updated_at,
];
}
Access from Controller or Route
Route::get('/offer', function () {
return new OfferResource(Offer::with('users')->find(1)); //eager load users
});