Gravity Wiz // Gravity Forms // Validate that a Value Exists

gw-gravity-forms-value-exists-validation.php

<?php
/**
 * Gravity Wiz // Gravity Forms // Validate that a Value Exists
 *
 * Ensure that a value entered in Form A has been previously submitted on Form B. This is useful if you're generating a reference number of some sort
 * on Form B and would like the user to enter it on Form A.
 *
 * @version   1.2
 * @author    David Smith <david@gravitywiz.com>
 * @license   GPL-2.0+
 * @link      http://gravitywiz.com/...
 */
class GW_Value_Exists_Validation {

    public function __construct( $args = array() ) {

        // set our default arguments, parse against the provided arguments, and store for use throughout the class
        $this->_args = wp_parse_args( $args, array(
	        'target_form_id'  => false,
	        'target_field_id' => false,
	        'source_form_id'  => false,
	        'source_field_id' => false,
	        'validation_message' => __( 'Please enter a valid value.' ),
	        'field_map'       => array(),
        ) );

        // do version check in the init to make sure if GF is going to be loaded, it is already loaded
        add_action( 'init', array( $this, 'init' ) );

    }

    public function init() {

        // make sure we're running the required minimum version of Gravity Forms
        if( ! property_exists( 'GFCommon', 'version' ) || ! version_compare( GFCommon::$version, '1.8', '>=' ) ) {
            return;
        }

		add_filter( 'gform_validation', array( $this, 'validation' ) );

    }

	public function validation( $result ) {

		if( ! $this->is_applicable_form( $result['form'] ) ) {
			return $result;
		}

		foreach( $result['form']['fields'] as &$field ) {

			if( $this->is_applicable_field( $field ) && ! GFFormsModel::is_field_hidden( $result['form'], $field, array() ) ) {

				if( ! $this->do_values_exists( $this->get_values(), $this->_args['source_form_id'] ) ) {
					$field['failed_validation'] = true;
					$field['validation_message'] = $this->_args['validation_message'];
					$result['is_valid'] = false;
				}
			}

		}

		return $result;
	}

	function does_value_exist( $value, $form_id, $field_id ) {

		$entries = GFAPI::get_entries( $form_id, array( 'status' => 'active', 'field_filters' => array( array( 'key' => $field_id, 'value' => $value ) ) ) );

		return count( $entries ) > 0;
	}

	function do_values_exists( $values, $form_id ) {

		$field_filters = array();

		foreach( $values as $field_id => $value ) {
			$field_filters[] = array(
				'key'   => $field_id,
				'value' => $value
			);
		}

		$entries = GFAPI::get_entries( $form_id, array( 'status' => 'active', 'field_filters' => $field_filters ) );

		return count( $entries ) > 0;

	}

	function get_field_map() {

		if( ! empty( $this->_args['field_map'] ) ) {
			$field_map = $this->_args['field_map'];
		} else {
			$field_map = array( $this->_args['target_field_id'] => $this->_args['source_field_id'] );
		}

		return $field_map;
	}

	function get_values() {

		$field_map = $this->get_field_map();
		$values = array();

		foreach( $field_map as $target_field_id => $source_field_id ) {
			$value = rgpost( 'input_' . $target_field_id );
			if( $value ) {
				$values[ $source_field_id ] = $value;
			}
		}

		return $values;
	}

	function is_applicable_form( $form ) {

		$form_id = isset( $form['id'] ) ? $form['id'] : $form;

		return $form_id == $this->_args['target_form_id'];
	}

	function is_applicable_field( $field ) {

		$field_map = $this->get_field_map();
		$target_field_ids = array_keys( $field_map );

		return $this->is_applicable_form( $field->formId ) && in_array( $field->id, $target_field_ids );
	}

}

# Configuration

new GW_Value_Exists_Validation( array(
	'target_form_id'  => 613,
	'target_field_id' => 1,
	'source_form_id'  => 519,
	'source_field_id' => 1,
	'validation_message' => 'Hey! This isn\'t a valid reference number.'
) );