Linked Folder (Entity File)

Returns the list of link folders for a to-many file_relation, putting as the first result a link folder to the
source of such relation and then one folder for each model instance which is a target of it.
Expects three query parameters:

• content_type_id: id of the content type of the source of the to-many relation
• object_id: id of the model instance of the source of the to-many relation
• link: key of the to-many relation, which will be one of the relations declared in the file_relation property
  of the CustomMeta inner class of the model which is the source of the to-many relation