Rails complex model association, shared document between users and teams of users

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Rails

I have a relatively complex model association in mind, and was wondering how I could accomplish it. In essence, this is what i want to accomplish.

- I have a User model, and a Document model
- User A can create a document. He is now the document admin.
1. He can then add other individual users to his document, and assign them permissions, ex: (Editor, Viewer, Admins)
2. He can also create a team, a group of users, and add multiple teams to his document. Each user on a team that User A has added to his document will also have a level of permissions. A user can belong to many teams.
I am a little bit confused about the associations I will have to setup.

What I have tried:

This is the code I have so far, which has not incorporated the team aspect:

<pre>
 class User < ApplicationRecord
   has_many :participations
   has_many :documents, through: :participations
 end

 class Document < ApplicationRecord
   has_many :participations
   has_many :users, through: :participations
 end

 class Participation < ApplicationRecord
   belongs_to :user
   belongs_to :document
   enum role: [ :admin, :editor, :viewer ]
 end