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Example:

Get a list of options showing the id and name in the label

Field::inst( 'users.site' )
       ->options( Options::inst()
           ->table( 'sites' )
           ->value( 'id' )
           ->label( [ 'name', 'id' ] )
           ->render( function ( $row ) {
             return $row['name'].' ('.$row['id'].')';
           } )
       )

Located at Editor/SearchPaneOptions.php
Methods summary
public DataTables\Editor\Options|string[]
# label( null|string|string[] $_ = null )

Get / set the column(s) to use as the label value of the options

public DataTables\Editor\Options|string
# order( null|string $_ = null )

Get / set the ORDER BY clause to use in the SQL. If this option is not provided the ordering will be based on the rendered output, either numerically or alphabetically based on the data returned by the renderer.

public DataTables\Editor\Options|callable
# render( null|callable $_ = null )

Get / set the label renderer. The renderer can be used to combine multiple database columns into a single string that is shown as the label to the end user in the list of options.

public DataTables\Editor\Options|string
# table( null|string $_ = null )

Get / set the database table from which to gather the options for the list.

public DataTables\Editor\Options|string
# value( null|string $_ = null )

Get / set the column name to use for the value in the options list. This would normally be the primary key for the table.

public DataTables\Editor\Options|callable
# where( null|callable $_ = null )

Get / set the method to use for a WHERE condition if it is to be applied to the query to get the options.

public DataTables\Editor\SearchPaneOptions
# leftJoin( string $table, string $field1, string $operator, string $field2 )

Get / set the array values used for a leftJoin condition if it is to be applied to the query to get the options.

Methods inherited from DataTables\Ext
_getSet(), _propExists(), _readProp(), _writeProp(), inst(), instantiate()