enable support for using the Survey add-on rating type field with conditional logic - Survey Add-On version 3.0 includes this functionality so this snippet is no longer required

RW_GF_Rating_Field_Logic.php

class RW_GF_Rating_Field_Logic {

	public function __construct() {
		add_action( 'init', array( $this, 'init' ) );
	}

	function init() {
		if ( ! property_exists( 'GFForms', 'version' ) || ! version_compare( GFForms::$version, '1.9.10', '>=' ) ) {
			return;
		}

		add_filter( 'gform_field_content', array( $this, 'maybe_add_logic_event' ), 10, 2 );
		add_filter( 'gform_admin_pre_render', array( $this, 'enable_rating_in_conditional_logic' ) );
	}

	function maybe_add_logic_event( $content, $field ) {
		if ( $field->get_input_type() != 'rating' ) {
			return $content;
		}
		$logic_event = $field->get_conditional_logic_event( 'change' );

		return ! empty( $logic_event ) ? str_replace( "radio'", "radio' {$logic_event}", $content ) : $content;

	}

	function enable_rating_in_conditional_logic( $form ) {
		if ( GFCommon::is_entry_detail() ) {
			return $form;
		}

		echo "<script type='text/javascript'>" .
		     " gform.addFilter('gform_is_conditional_logic_field', function (isConditionalLogicField, field) {" .
		     "     return field.inputType == 'rating' ? true : isConditionalLogicField;" .
		     '	});' .
		     '</script>';

		return $form;
	}

}

new RW_GF_Rating_Field_Logic();