'string', 'asset_id' => 'string', 'device_profile_id' => 'string' ]; // Relationships public function asset() { return $this->belongsTo(Asset::class, 'asset_id', 'id'); } public function deviceProfile() { return $this->belongsTo(DeviceProfileMaster::class, 'device_profile_id', 'id'); } public function timeseriesKeys() { return $this->hasMany(TimeseriesKeyMaster::class, 'device_profile_xid', 'device_profile_id'); } }