How to create a ability based on array values?

[Smejky338]

Hello, I'd like to ask you for help for my Master thesis.
I have User model with arrays groups and permissions and I'd like to create a rule that allows current_user to show a user_resource if the current_user's permissions overlap with user_resource's groups, i.e. (current_user.permissions & user_resource.groups).any? is true.

How do I write a rule in ability.rb for that?
I've tried this:

def initialize(user)
  user ||= User.new
  can :read, User, groups: user.permissions
end

But it doesn't work. I guess that it would work only if the whole array of groups would match the permissions, but I want it to work if at least one of the elements are the same.

ChatGPT recommended to use a lambda, but it doesn't seem to work for me either. I guess can only accepts a hash. Do you by any chance know if that is the case? It didn't give me an error, just the authorization has failed.

can :read, User do |user|
  user.groups.include?(g)
end

The groups could be something like this:

groups = (1..11).map { |n| "group#{n}".to_sym }
user_resource = User.new(id: 3, name: '3333', email: '333@333.333', groups: groups)

and the permissions of a given user to be something like this:

permissions = (10..1000).map { |n| "group#{n}".to_sym }
@current_user = User.new(id: 2, name: 'Joe', email: 'Joe@Doe.com', permissions: permissions)

Is there some other (simpler) way? I've briefly looked into https://github.com/martinrehfeld/role_model but it doesn't seem to solve my issue.

Thank you