Beginnings of a ProcessWire Vote module

FieldtypeVoteUpDown.php

<?php

/**
 * ProcessWire VoteUpDown Fieldtype
 *
 * A field that allows user's to vote on a page with a simple up or down 
 *
 * For documentation about the fields used in this class, please see:  
 * /wire/core/Fieldtype.php
 * /wire/core/FieldtypeMulti.php
 * 
 * ProcessWire 2.x 
 * Copyright (C) 2010 by Ryan Cramer 
 * Licensed under GNU/GPL v2, see LICENSE.TXT
 * 
 * http://www.processwire.com
 * http://www.ryancramer.com
 *
 */

/**
 * ProcessWire VoteUpDown Fieldtype
 *
 * A field stores an up or down vote for a page 
 *
 */
class FieldtypeVoteUpDown extends FieldtypeMulti {


	public static function getModuleInfo() {
		return array(
			'title' => 'Vote Up/Down',
			'version' => 101,
			'summary' => 'Field that stores up or down votes for a page',
			'permanent' => false, 
			);
	}
	
	/**
	 * Sanitize value for storage
	 *
	 */
	public function sanitizeValue(Page $page, Field $field, $value) {
		return $value;
	}


	/**
	 * Return either a blank Page or a blank PageArray
	 *
	 */
	public function getBlankValue(Page $page, Field $field) {
		return null;
	}
	
	/**
	 * Return the associated Inputfield
	 * I think this gets the field used when viewing the page in the admin.  Would be vote tally here.
	 */
	public function getInputfield(Page $page, Field $field) {
		return null; 
	}
	
	/**
	 * When renderMapMarkup is on, this will generate the markup for the map and return it, ready to output. 
	 *
	 * When renderMapMarkup is off, this will just return the raw data.
	 *
	 */
	public function formatValue(Page $page, Field $field, $value) {

		// this is where we put the HTML that will render the voting mechanism
		$out = '<p>' . $field->prompt . '</p>';
		$out .= '<form action="./" method="post" name="vote_form"><input type="submit" name="submit" /><input type="hidden" name="vote" value="1" /></form>';

		return $out; 
		
	}
	
	/**
	 * Schema for the VoteUpDown Fieldtype
	 *
	 */
	public function getDatabaseSchema(Field $field) {
		$schema = parent::getDatabaseSchema($field); 
		$schema['id'] = "int unsigned NOT NULL auto_increment";
		$schema['vote'] = "tinyint(3) NOT NULL default '0'"; 
		$schema['created'] = "int unsigned NOT NULL"; 	
		$schema['keys']['primary'] = "PRIMARY KEY (`id`)"; 

		return $schema;
	}
	
	/**
	 * Return the fields required to configure an instance of FieldtypeVoteUpDown
	 *
	 */
	public function ___getConfigInputfields(Field $field) {
		$inputfields = parent::___getConfigInputfields($field);
		
				$name = 'prompt';
				$f = $this->fuel('modules')->get('InputfieldText'); 
				$f->attr('name', $name); 
				$f->attr('value', $field->$name); 
				$f->label = 'Enter the text you\'d like to use as the prompt for the voting';
				$f->description = "For example 'Did this content help you understand [topic]?'.";
				$inputfields->append($f);

		return $inputfields; 
	}
	
	/**
	 * Per the Fieldtype interface, Save the given Field from the given Page to the database
	 *
	 * @param Page $page
	 * @param Field $field
	 * @return bool
	 *
	 */
	public function ___savePageField(Page $page, Field $field) {
		$sql = "INSERT INTO `{$field->table}` SET pages_id={$page->id}, vote = 1";
		if(!$result = $this->db->query($sql)) $this->error("Error saving item");
		return true;
		
	}
	
	
}