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/**

 * Override the default data for a Field API field.

 *

 * Field module's implementation of hook_views_data() invokes this for each

 * field in the module that defines the field type (as declared in the field

 * array). It is not invoked in other modules.

 *

 * If no hook implementation exists, hook_views_data() falls back to

 * field_views_field_default_views_data().

 *

 * @see field_views_data()

 * @see hook_field_views_data_alter()

 * @see hook_field_views_data_views_data_alter()

 *

 * @param $field

 *  A field definition array, as returned by field_info_fields().

 *

 * @return

 *  An array of views data, in the same format as the return value of

 *  hook_views_data().

 */

function hook_field_views_data($field) {

}

/**

 * Alter the views data for a single Field API field.

 *

 * This is called even if there is no hook_field_views_data() implementation for

 * the field, and therefore may be used to alter the default data that

 * field_views_field_default_views_data() supplies for the field.

 *

 * @param $result

 *  An array of views table data provided for a single field. This has the same

 *  format as the return value of hook_views_data().

 * @param $field

 *  A field definition array, as returned by field_info_fields().

 * @param $module

 *  The module that defines the field type.

 *

 * @see field_views_data()

 * @see hook_field_views_data()

 * @see hook_field_views_data_views_data_alter()

 */

function hook_field_views_data_alter(&$result, $field, $module) {

}

/**

 * Alter the views data on a per field basis.

 *

 * Field module's implementation of hook_views_data_alter() invokes this for

 * each field in the module that defines the field type (as declared in the

 * field array). It is not invoked in other modules.

 *

 * Unlike hook_field_views_data_alter(), this operates on the whole of the views

 * data. This allows a field module to add data that concerns its fields to

 * other tables, which would not yet be defined at the point when

 * hook_field_views_data() and hook_field_views_data_alter() are invoked. For

 * example, entityreference adds reverse relationships on the tables for the

 * entities which are referenced by entityreference fields.

 *

 * (Note: this is weirdly named so as not to conflict with

 * hook_field_views_data_alter().)

 *

 * @see hook_field_views_data()

 * @see hook_field_views_data_alter()

 * @see field_views_data_alter()

 */

function hook_field_views_data_views_data_alter(&$data, $field) {

  $field_name = $field['field_name'];

  $data_key = 'field_data_' . $field_name;

  // Views data for this field is in $data[$data_key]

}