Morph to Many using JoinRelationShipUsingAlias('relation_name') not working correctly

[JurjenRoels]

Hello,

I join the table attributes with a MoprhMany to lookups with lookupables. In attributes I create the relation in this way

return $this->morphToMany(Lookup::class, 'lookupable')->where('lookups.type', 'attribuut_datatype');

I call the powerjoinfunction: joinRelationshipUsingAlias, with only the name of the relation as a parameter

Powerjoin creates the following query:

inner join `lookupables` as `31816ced6e12347e02dbcd4865c7f779` on `31816ced6e12347e02dbcd4865c7f779`.`lookupable_id` = `attributen`.`id` 
inner join `lookups` as `52c1d48dd796b76bfe00982d5469c0d5` on `52c1d48dd796b76bfe00982d5469c0d5`.`id` = `31816ced6e12347e02dbcd4865c7f779`.`lookup_id` 
        and `52c1d48dd796b76bfe00982d5469c0d5`.`deleted_at` is null 
        and `lookupables`.`lookupable_type` = ? and `52c1d48dd796b76bfe00982d5469c0d5`.`type` = ?

As you can see. the lookupable_type is not using the alias.

Kind Regards
Jurjen

[JurjenRoels]

Also When providing the alias manually, this is not working properly

->leftJoinRelationshipUsingAlias($field['foreignKey']['relation'], [
                                    'lookups' => function ($join) use($lookupAlias) {
                                        $join->as($lookupAlias);
                                    },
                                    'lookupables' => function ($join) use($lookupableAlias) {
                                        $join->as($lookupableAlias);                                    }
                                ]);

Result:

LEFT JOIN `lookupables` AS `attributen_is_sleutelveld_lookupables` ON `lookupables`.`lookupable_id` = `attributen`.`id`
  LEFT JOIN `lookups` AS `attributen_is_sleutelveld_lookups` ON `attributen_is_sleutelveld_lookups`.`id` = `lookupables`.`lookup_id`