A function to automatically fill in an edit gravity form with the appropriate data from a custom table object

Pre_Render_Object.php

add_filter('gform_pre_render_3', 'populate_fields_contact'); // Document Form
function populate_fields_contact( $form ){

	// Make sure we're editing the object correctly
	if ( $_GET['update_contact'] ){

		// Set our default values
		$data_type = "contact";
		$data_type_length = 8; // 'contact_' = 8 char

		// Run our query - I'm using a custom sql query class (EE_Query) since I'm reusing it multiple times
		$args = array(
			'type'			=> $data_type,
			'log_id'		=> $_GET['update_contact'],
		);

	    $contact = EE_Query::get_query( $args );
	    $contact_object = $contact[0];

		// Loop through our resulting object set and re-assign into an easier array
		foreach ( $contact_object as $key => $value ){

			$contact_key_array[] = $data_type."_".$key;

		}

		// Loop through all possible fields
	    foreach ( $form['fields'] as &$field ){

			// If our field is one of multiple input fields
			if ( $field['type'] == 'name' || $field['type'] == 'address' ){

				// Loop through the inputs in the fields
				foreach( $field['inputs'] as $input ){

					// Check to see if the dynamic population name matches our arry
					if( in_array( $input["name"], $contact_key_array ) ) :

						// If it does, strip the "_contact" prefix
						$correct_key = substr( $input["name"], $data_type_length );

						// Set the field value to the correct value
						$field['defaultValue']["$input[id]"] = $contact_object["$correct_key"];

			        endif;

				}

			// If it is a normal field, the process is even easier
			} else {

				if( in_array( $field["inputName"], $contact_key_array )  ) : // $field["inputName"] == "contact_".$key

					$correct_key = substr( $field["inputName"], $data_type_length );

					$field["defaultValue"] = $contact_object["$correct_key"];

		        endif;

			}

	    }

	}

	return $form;

}