如何在Drupal 7数据库中查询必填字段？

Question

I am trying to write a function that will get me the names of the required fields from the drupal database. Then, so I can write one validation function for alerting the user that he/she has not entered in a required field.

Answer 1

You can get this quite easily using the field_info_instances() function:

$instances = field_info_instances('node', 'invoice');
$required = array();
foreach ($instances as $field_name => $instance) {
  if ($instance['required'] == 1) {
    $required[] = $field_name;
  }
}

To get the field type you need to query for the field not the instance. In the loop you can call:

$field = field_info_field($field_name);
$type = $field['type'];