Rated user interests

Question

I would like to create rated inteterests for each user. Until now what I have is a taxonomy term vocabulary defined and a field in the user account attached to this vocabulary. Until here what a user can do is to check or not each term of the vocabulary, using the widget options_list. What I would like to do is to let the user select the level (0-10) of preference for each term.

I've tried to create a custom field with two columns, tid and value, then linking each tid with taxonomy term in hook_field_widget_form, but no luck as I'm not an expert in fields, so I'm confused about how to implement:

/**
 * Implements hook_field_widget_form().
 */
function taxonomy_value_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {
  $tids = isset($items[$delta]['tid']) ? $items[$delta]['tid'] : array();
  $values = isset($items[$delta]['value']) ? $items[$delta]['value'] : array();
  $element += array(
    '#delta' => $delta,
  );

  switch ($instance['widget']['type']) {

    case 'taxonomy_value_widget':
      if ($vocabulary = taxonomy_vocabulary_machine_name_load('tags')) {
        if ($terms = taxonomy_get_tree($vocabulary->vid)) {
          foreach ($terms as $term) {
            if ($term->depth == 0) {
              $element[$term->tid] = array(
                '#markup'  => '</br><strong>' . $term->name . '</strong>',
              );
            } else {
              $element[$term->tid]['term'] = array(
                '#markup'  => '</br>' . $term->name,
              );

              $element[$term->tid]['tid'] = array(
                '#type'          => 'value',
                '#value'         => $term->tid,
              );

              $element[$term->tid]['value'] = array(
                '#type'          => 'textfield',
                '#value'         => in_array($term->tid, $values) ? $values[$term->tid] : 5,
              );

            }
          }
        }
      }

      break;
  }

  return $element;
}

Answer 1

what not using Field Collection ?

Answer 2

The problem was with values: they had to be trasposed. This solution uses transfer_slider from jquery.

/**
 * Implements hook_field_widget_form().
 */
function taxonomy_value_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {
  $values = taxonomy_value_traspose_values($items);
  $element += array(
    '#delta' => $delta,
  );

  switch ($instance['widget']['type']) {

    case 'taxonomy_value_widget':

      if ($vocabulary = taxonomy_vocabulary_machine_name_load('tags')) {
        if ($terms = taxonomy_get_tree($vocabulary->vid)) {
          foreach ($terms as $term) {
            if ($term->depth == 0) {
              $element[$term->tid] = array(
                '#markup'  => '</br><strong>' . $term->name . '</strong>',
              );
            } else {
              $element[$term->tid]['term'] = array(
                '#markup'  => '<span class="taxonomy_value-taxonomy-string">' .  $term->name . '</span>',
              );

              $element[$term->tid]['tid'] = array(
                '#type'          => 'value',
                '#value'         => $term->tid,
              );

              $element[$term->tid]['slidervalue'] = array(
                '#type'          => 'transfer_slider',
                '#title'         => '',
                '#left_value'    => array_key_exists($term->tid, $values) ? $values[$term->tid] : 5,
                '#right_value'   => array_key_exists($term->tid, $values) ? 10 - $values[$term->tid] : 5,
                '#left'          => '',
                '#right'         => '',
              );

              // Tengo que hacerlo así ya que transfer_slider está diseñado para tener 2 textfields. Este campo lo actualizo en presave.
              $element[$term->tid]['value'] = array(
                '#type'          => 'value',
                '#value'         => array_key_exists($term->tid, $values) ? $values[$term->tid] : 5
              );
            }
          }
        }
      }

      break;
  }

  return $element;
}

/**
 * Dado un array 'delta' => ('tid' => X, 'value' => Y), devuelve un array associativo 'X' => Y.
 * @param unknown_type $items
 */
function taxonomy_value_traspose_values($items) {
  $values = array();
  foreach ($items as $item) {
    $values[$item['tid']] = $item['value'];
  }

  return $values;
}