Voyager: [BUG] Select search returns no results on belongsTo relationship using additional_attribute

[DaLooK]

Version information

• Laravel: v5.7.28
• Voyager: v1.2.6
• PHP: 7.1
• Database: MySQL 5.7.26

Description

When using a belongsTo relationship and selecting an additional_attribute as the display column, at the time of adding a new model and searching using the select2 ajax searchbar, an error is reported as the MySQL query tries to look for the additional_attribute as a column in the table.

Steps To Reproduce

Steps to reproduce the behavior:

1. Add an additional_attribute to a model (_Model1_)
2. Add a belongsTo relationship from another model (_Model2_) to the model with the additional_attribute (_Model1_)
3. Select the additional_attribute as the display column for the belongsTo relationship
4. Try create a new _Model2_ and use the search bar in the relation field to _Model1_
5. No results should be returned
6. An error should be logged to the error log with something like SQLSTATE[42S22]: Column not found: 1054 Unknown column

Expected behavior

When searching for _Model1_ names, they should be filtered and returned to the list

Screenshots

[MrCrayon]

Fixed in #4562

[github-actions[bot]]

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