Yes, I need this to store the collaborators for each wiki.

the params looks something like the following when it is passed into wikis#new and wikis#update
```
[1] pry(#<WikisController>)> params
=> {"utf8"=>"✓",
 "_method"=>"patch",
 "wiki"=>{"title"=>"MyString", "body"=>"MyText", "collaborator_ids"=>["1"]},
 "commit"=>"Update",
 "action"=>"update",
 "controller"=>"wikis",
 "id"=>"1"}
```