CakePHP 3 Saving BelongsToMany Association Unknown type “” Error
问题 I've been banging my head against the wall trying to figure out why my Emails (belongsToMany Guests (belongsToMany Emails)) won't save. When I attempt to save the email model with associated data (guests) it fails at $this->Emails->save($email) with: Unknown type "" Error InvalidArgumentException I've followed the CakeBookmarks example (http://book.cakephp.org/3.0/en/tutorials-and-examples/bookmarks/intro.html) to the tee at this point for relationships and the edit form. And even built it