Gravity Perks // GP Populate Anything + GP Limit Choices

gp-populate-anything-plus-gp-limit-choices.php

<?php

add_action( 'init', function() {

	$gplc_form_id = 123;
	$gplc_field_id = 4;

	if( is_callable( 'gp_limit_choices' ) ) {

		add_filter( "gform_pre_process_{$gplc_form_id}", function( $form ) {
			global $gplc_field_id;

			foreach( $form['fields'] as $field ) {
				if( $field->id == $gplc_field_id ) {
					$field->{gp_limit_choices()->key( 'enableLimits' )} = true;
				}
			}

			return $form;
		} );

		add_filter( "gppa_input_choices_{$gplc_form_id}_{$gplc_field_id}", function( $choices, $field ) {

			foreach( $choices as &$choice ) {
				$choice['limit'] = 1;
			}

			$choices = gp_limit_choices()->apply_choice_limits( $choices, $field, GFAPI::get_form( $field->formId ) );

			return $choices;
		}, 10, 2 );

	}

} );