Laravel/Eloquent ORM - retrieve only referenced records - php

Question

I have a many-to-many relationship which I resolved with an intersection table.
So table A and B are connected through AxB.
A and AxB are 1-n and B and AxB are 1-n.
The actual names of the tables:
table A = extensiontables_registry
table B = ad_groups
table AxB = extensiontables_registryxad_groups
You can see the logical datamodel here:
https://imgur.com/MNpC3XV
Ive put the part we are talking about right now into a red frame.
Now, I have the following line of code in my backend-API:
$permittedTables = extensiontables_registry::findMany($ids)->pluck('extensiontable_name')->toArray();
To keep things short, the $ids contains all the ids from "ad_groups". These I've gotten from a fetch which works as intended.
The $ids contains these values/ids according to my logs:
[1,2,3,4,5,6,7,8,9,10,12]
Now, the extensiontables_registryxad_groups currently looks like this:
select * from extensiontables_registryxad_groups;
+-----------------------------+-------------+------------+------------+
| extensiontables_registry_id | ad_group_id | created_at | updated_at |
+-----------------------------+-------------+------------+------------+
| 1 | 8 | NULL | NULL |
| 2 | 8 | NULL | NULL |
+-----------------------------+-------------+------------+------------+
2 rows in set (0.000 sec)
And the extensiontables_registry looks like this:
+----+-----------------------+------------+------------+
| id | extensiontable_name | created_at | updated_at |
+----+-----------------------+------------+------------+
| 1 | extensiontable_itc | NULL | NULL |
| 2 | extensiontable_sysops | NULL | NULL |
| 3 | test | NULL | NULL |
+----+-----------------------+------------+------------+
And now the problem is that my codesnippet from above:
$permittedTables = extensiontables_registry::findMany($ids)->pluck('extensiontable_name')->toArray();
returns me this result:
array (
0 => 'extensiontable_itc',
1 => 'extensiontable_sysops',
2 => 'test',
)
So the codesnippet does NOT do what I want it to do. It should only fetch me the names of those extensiontables which have IDs which exist on the very same record(s) in extensiontables_registryxad_groups with IDs from my inputarray above. So The result I currently would expect would be this:
array (
0 => 'extensiontable_itc',
1 => 'extensiontable_sysops'
)
I am pretty new to laravel and eloquent, so I dont really know what I did wrong in my codesnippet. I also have no idea what I can do to get this working as intended ^^
For the sake of completeness, I'll show you my eloquent models/classes for this arrangement of tables, just in case you might need it:
AD_Group.php:
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Ad_group extends Model
{
/**
* The attributes that are mass assignable.
*
* #var array
*/
protected $fillable = [
'name'
];
/**
* Hides pivot from return queries.
*
* #var array
*/
protected $hidden = [
'pivot'
];
/**
* Many-To-Many relationship with User-Model.
*/
public function Ad_users()
{
return $this->belongsToMany('App\Ad_user', 'Ad_usersxad_groups', 'Ad_group_id', 'Ad_user_id');
}
public function extensiontables()
{
return $this->belongsToMany('App\extensiontables_registry', 'extensiontables_registryxad_groups');
}
}
extensiontables_registry.php:
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Extensiontables_Registry extends Model
{
/**
* The table associated with the model.
*
* #var string
*/
protected $table = 'Extensiontables_Registry';
/**
* The attributes that are mass assignable.
*
* #var array
*/
protected $fillable = [
'extensiontable_name'
];
/**
* Many-To-Many relationship with User-Model.
*/
public function Ad_groups()
{
return $this->belongsToMany('App\Ad_group', 'extensiontables_registryxad_groups');
}
}
I would be really thankful if you could help me or at least give me a hint what to look out for in order to find information on leveraging the methods of laravel/eloquent accordingly ^^ If you need any more info, ask right away :)

Answer 1

I think you got things a little mixed up.
what this query does:
$permittedTables = extensiontables_registry::findMany($ids)->pluck('extensiontable_name')->toArray();
is access the extensiontables_registry table and get records with the same array of $ids you sent.
But it will NOT take in consideration the relationship with extensiontables_registryxad_groups table because you didn't explicitly specify it in the query.
What you should add is has('relationship name') which get the records of this model that only has a corresponding Foreign key in relationship name' in your case Ad_groups
So in this case the query would look like this:
$permittedTables = extensiontables_registry::has('Ad_groups')->pluck('extensiontable_name')->toArray();

Answer 2

i think you can get there using join:
$permittedTables = extensiontables_registry::whereIn('id', $ids)
->join('extensiontables_registryxad_groups','extensiontables_registryxad_groups'.'extensiontables_registry_id','extensiontables_registry.id')
->select('extensiontables_registry.extensiontable_name')->get()->all();
please note you can avoid repeated results using 'distinct';