Drupal force text format for a field

bluecollar_helper.php

<?php
/**
* Implements hook_element_info_alter().
*
* Sets the text format processor to a custom callback function.
* This code is taken from the Better Formats module.
*/
function bluecollar_helper_element_info_alter(&$type) {
  if (isset($type['text_format']['#process'])) {
    foreach ($type['text_format']['#process'] as &$callback) {
      if ($callback === 'filter_process_format') {
        $callback = 'bluecollar_helper_filter_process_format';
      }
    }
  }
}

/**
* Callback for bluecollar_helper_element_info_alter().
*/
function bluecollar_helper_filter_process_format($element) {
  $element = filter_process_format($element);
  // Change input format to "Filtered HTML" for body fields of article nodes
  if (isset($element['#bundle']) && $element['#bundle'] == 'photo' && $element['#field_name'] == 'field_text') {
    $element['format']['format']['#default_value'] = 'wysiwyg_mini';
    $options['wysiwyg_mini'] = $element['format']['format']['#options']['wysiwyg_mini'];
    $element['format']['format']['#options'] = $options;
  }

  return $element;
}