why importer cannot map to custom field type I've created a custom field type and added a field with this field type to my content. When I add set any data on Node Edit page, the data will store into the database successfully. But if I try to set the data via feeds importer, in mapping, this field is missing. I don't know if I missed any hook function in my module, or is there any setting I have to do in my module. 

Here, I list all hook functions I am using:


hook_field_info
hook_field_widget_info
hook_field_widget_form
hook_element_info
hook_theme
hook_content_is_empty


Does anyone have any idea about why I cannot find my field in mapping list? If you need more information, please leave me a message. Thank you!!!
You may also need to specify the field mapping details in:

hook_feeds_processor_targets_alter


  Alter mapping targets for entities. Use this hook to add additional target options to the mapping form of Node processors.


Example implementations: http://www.drupalcontrib.org/api/drupal/contributions%21feeds%21feeds.api.php/function/implementations/hook_feeds_processor_targets_alter/7

More info: http://www.drupalcontrib.org/api/drupal/contributions%21feeds%21feeds.api.php/group/mappingapi/7