wiki_policy.rb

class WikiPolicy < ApplicationPolicy
  
  class Scope < Struct.new(:user, :scope)
    def resolve
      if user.admin?
        scope.all
      else
        scope.where(user: user)
      end
    end
  end

  def index?
    if user.role?(:admin)
      true
    elsif user.role?(:premium)
      !wiki.private? && (wiki.user == user || wiki.collaborators.map{|collab| collab.user}.include?(user)) 
    else
      false
    end
  end
  

  def update?
    index?
  end

  def edit?
    index?
  end

  def create?
    user.present?
  end

  def show?
    wiki.private? ? update? : true
  end

  def destroy?
    update?
  end

end