Relations with conditions, is it possible ?

[Rostyslav Pasichnyk]

Is there a way to put some condition into relations()?

If I have a table: "Table 1", with fields: "user_id", "user_type". And I need to connect "user_id" with table "Doctors" or with "Patients" depending on what contains "user_type".

Thank you.

[László Dobó]

This question isn't Spot related. You can't do that on the relational database level. You can read more about it here.

[Rostyslav Pasichnyk]

I had guessed it's impossible on the relational database level. But maybe Spot has a way to walk over it?

[László Dobó]

I don't think so. You can define dynamic relations, but you shouldn't really. It would be a mess.

[Rostyslav Pasichnyk]

I've understood I need to change structure of the tables.
But if I would wanted to make that implementation, do I can get value of the field ?

public static function relations(MapperInterface  $mapper, EntityInterface $entity)
    {
        switch( /* fieldName->value  */ ) //  <- ??
        {
            case "doctor":
                return [
                    "user" => $mapper->belongsTo($entity, "Doctors", "user_id")
                ]
                break;
            case "patient":
                return [
                    "user" => $mapper->belongsTo($entity, "Patients", "user_id")
                ]
                break;
        }
}

[László Dobó]

In theory you can do that. You must disable foreign key support and have to implement all the things that will ensure database integrity on the application side (and by default is done by the DBMS).

I don't think that's worth it.