The m_identity model manages usernames and other user identities. mod_authentication uses it to store and check salted passwords, but also provides a safe storage for user tokens of any kind, as used by mod_facebook.
Note that a user does not have to be of the person category per se, in Zotonic anything can have identities attached to it.
The following m_identity model properties are available in templates:
|Check if a page id is an user. Return a bool. Usage: m.identity[page_id].is_user
|Fetch the username, if any, of a user. Returns a binary or undefined. Usage: m.identity[page_id].username