Use 2 different columns depending on a value within an Eloquent Model - php

Question

got a strange scenario here and going to try my best to explain it, i'm basically merging 2 separate systems which are very similar but use different column names.
So, tablea has got one tableb, however tableb is either selected using column id_1 or id_2.
This check is done within a local scope when using the model directly:
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
class Tableb extends Model
{
protected $table = 'tableb';
public function scopeMode(Builder $query, $id)
{
if (env('DEMO_MODE')) {
return $query->where('id1', '=', $id);
}
return $query->where('id2', '=', $id);
}
}
So to using the above model as follows works fine:
Tablea::mode()->first();
However, using this within a relationship then has issues, as the related column name can change, so I must do the same logic within this relationship, but I want to do all of this logic in one place (tableb) to avoid doing it in other relationships:
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class Tablea extends Model
{
public function Tableb()
{
if (env('DEMO_MODE')) {
return $this->hasOne(Tableb::class, 'id2', 'tableb_id');
}
return $this->hasOne(Tableb::class, 'id1', 'tableb_id');
}
}
Ideas?

Answer 1

An suggestion would be creating a static function on the tableb that returns which id should be used in tablea, something like the following:
(NOTE: I haven't tested the code yet)
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
class Tableb extends Model
{
protected $table = 'tableb';
public function scopeMode(Builder $query, $id)
{
return $query->where(self::getId(), '=', $id);
}
public static function getId()
{
return env('DEMO_MODE') ? 'id2' : 'id1';
}
}
and then
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class Tablea extends Model
{
public function Tableb()
{
return $this->hasOne(Tableb::class, Tableb::getId(), 'tableb_id');
}
}