/**
  * 修改字段页面.
  * 
  * @access public
  * @return void
  */
 public function edit($id)
 {
     $id = intval($id);
     if ($id < 1) {
         $this->error('字段参数非法');
     }
     $modelField = new FieldModel();
     $fieldInfo = $modelField->fetchFieldDetailInfo($id);
     if (empty($fieldInfo)) {
         $this->error('无效的字段');
     }
     $fieldInfo['fieldName'] = substr($fieldInfo['fieldName'], strlen($this->_field_prefix));
     // 去掉字段名前缀.
     $fieldInfo['formSet'] = $this->makeFormOptions(unserialize($fieldInfo['formSet']) ? unserialize($fieldInfo['formSet']) : array());
     // 生成 formSet.
     $fieldInfo['searchRules'] = $this->makeFormOptions(unserialize($fieldInfo['searchRules']) ? unserialize($fieldInfo['searchRules']) : array());
     // 生成搜索规则.
     $fieldInfo['jsRules'] = unserialize($fieldInfo['jsRules']);
     $validateRules = $this->getValidateRules();
     // 将验证规则处理成 js 方便对应处理的关系列表.
     $validateRuleRelations = [];
     foreach ($validateRules as $row) {
         $validateRuleRelations[$row['name']] = ['text' => $row['text'], 'notice' => $row['notice']];
     }
     $linkMenus = [];
     if ((int) $fieldInfo['lid'] > 0) {
         // 是联动菜单项.
         $modelLinklevel = new LinklevelModel();
         $linkMenus = $modelLinklevel->fetchList(0);
         // 获取联动一级菜单.
         unset($modelLinklevel);
     }
     $this->assign(['fieldInfo' => $fieldInfo, 'fieldTypes' => $this->getFieldTypes(), 'formTypes' => $this->getFormTypes(), 'validateRules' => $validateRules, 'validateRuleRelations' => $validateRuleRelations, 'linkMenus' => $linkMenus])->display();
 }