Laravel 5.4 many to many relationships with foreign key - php

Question

i'm using a data table with name auct_lots_full for my Lot.php model, where primary key is lot_id, in order everything to work i used Sofa/Eloquence extension, Mappable. So this is my model :
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
use Sofa\Eloquence\Eloquence;
use Sofa\Eloquence\Mappable;
class Lot extends Model
{
use Eloquence, Mappable;
protected $table = 'auct_lots_full';
protected $maps =[
'id' => 'lot_id',
];
public function scopeFilter($query, QueryFilter $filters)
{
return $filters->apply($query);
}
public function comments()
{
return $this->hasMany(Comment::class);
}
}
But he problem is that in some cases it keeps looking for id column as primary key. For example in LotsController.php i have this problem here :
public function show($id)
{
$lot = Lot::find($id);
return view('lots.show')->withLot($lot);
}
But i fix this problem with this solution:
public function show($id)
{
$lot = Lot::where('lot_id', $id)->first();
return view('lots.show')->withLot($lot);
}
But i understand that is just a solution for only this function...
So the same problem i have in CommentsController.php:
public function show()
{
$comments = Comment::orderBy('id', 'desc')->paginate(30);
return view('comments.browse', compact('comments'));
}
And i don't know how to fix it. Could any one explain me why is this happening? Is there a better way than use an extension? How i can fix this error in CommentsCotroller.php ?
This is the Comment.php model:
<?php
namespace App;
class Comment extends Model
{
public function lot()
{
return $this->belongsTo(Lot::class);
}
public function User()
{
return $this->belongsTo(User::class);
}
}

Answer 1

There is a primaryKey variable in your Model file which is id by default.
/**
* The primary key for the model.
*
* #var string
*/
protected $primaryKey = 'id';
If you override this variable in Lot model file. So your primary key will be lot_id instead of id as in default. Simply add this;
protected $primaryKey = 'lot_id';

Answer 2

So actually i find a proper way to do it with out Sofa/Eloquence extension, using not only foreign key but also a local key in many to many relationship. So this is the new code:
so for Lot.php i did this:
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Lot extends Model
{
protected $table = 'auct_lots_full';
protected $primaryKey = 'lot_id';
public function scopeFilter($query, QueryFilter $filters)
{
return $filters->apply($query);
}
public function comments()
{
return $this->hasMany(Comment::class,'lot_id', 'lot_id');
}
}
Than i did same for the Comment.php model:
<?php
namespace App;
class Comment extends Model
{
public function lot()
{
return $this->belongsTo(Lot::class, 'lot_id', 'lot_id');
}
public function User()
{
return $this->belongsTo(User::class);
}
}
So what we see above, in Lot.php model, function comments i pass foreignKey: 'lot_id' in auct_lots_full table and localKey 'lot_id' in comments table witch refers to the auct_lots_full table. In Comment.php model wi did the same but in case instead of localKey it is ownerKey. Im a bad at explaining so i will attach some images to make sense.
Lot.php
Comment.php