laravel BelongsTo relationship with different databases not working

Question

I\'ve seen in several places to \"stay away\" from this, but alas - this is how my DB is built:

class Album extends Eloquent {

   // default connection

            


        

Answer 1

This is my own solution and it works in general for me but its mega-complicated.

I'm using the builder "from" method to set the table and database correctly inside the subquery. I just need to pass the correct information inside.

Assume the subquery can be as complicated as "genres.sample" or even deeper (which means albums has a relation to genres, and genres has a relation to samples) this is how

$subQuery = 'genres.samples';
$goDeep = (with (new Album));

$tableBreakdown =  preg_split('/\./', $subQuery); //  = ['genres', 'samples']

// I recurse to find the innermost table $album->genres()->getRelated()->sample()->getRelated()
foreach ($tableBreakdown as $table)
    $goDeep = $goDeep->$table()->getRelated();

// now I have the innermost, get table name and database name

$alternativeConnection =  Config::get("database.connections." . $goDeep->getConnectionName() . ".database"); // should be equal to the correct database name

$tableName = $goDeep->getTable(); // I have to use the table name in the "from" method below

Album::whereHas($subQuery, function ($q) use ($alternativeConnection, $tableName) {
$q->from("$alternativeConnection.$tableName"); 
$q->where(....... yadda yadda);
    });

tl:dr;

Album::whereHas('genres', function ($q) { 
    $q->from('resources.genres')->where(....); 
});

Answer 2

To start change 'Resources' in database.php by 'resources', will be better !

I'm curious, can you try that ?

Album::whereHas('genre', function ($q) {
   $q->setConnection('resources')->where('genre', 'German HopScotch'); 
});

Answer 3

I was facing the same issue on Laravel 5.6. On a Many-to-Many scenario, and supposing the connection from my ModelA was the default one, what I did was the following:

1.- Prefix the schema name in the relationships:

// From ModelA and default connection (a.k.a connection1)
$this->belongsToMany('ModelB', 'schema.pivot-table-name');

// From ModelB and connection2
$this->belongsToMany('ModelA', 'schema.pivot-table-name');

2.- Overwrite connection parameter within the ModelB class and also specify the schema as a prefix in the overwritten $table attribute e.g.

protected $connection = 'connection2';

protected $table = 'connection2-schema-name.table';

3.- In case of requiring a custom behavior for the pivot table, what I did was just to implement the required model and specify it via the ->using('PivotModel'); function on the models relationships (as stated in the documentation). Finally I did the same as in the point 2 above, but on the pivot model

I haven't tried it yet, but I guess the same can be done for other kind of relationships, at least for the basic ones (One-to-One, One-to-Many, etc)