Example using Devise's current_user with Trailblazer and Cells 4.0.0.beta5

cell.rb

# concepts/account/cell.rb
class Account::Cell < Cell:Concept
  ...
  
  def show
    render
  end
  
  class Grid < Cell::Concept
    def show
      concept('account/cell', collection: options[:current_user].accounts)
    end
  end
end

index.html.erb

<%# views/accounts/index.html.erb %>
<%= concept("account/cell/grid", nil, current_user: current_user) %>

This replaces:

class Grid < Cell::Concept
  include include Devise::Controllers::Helpers
  helper_method :current_user

  def show
    concept('account/cell', collection: current_user.accounts)
  end
end

as worked in beta3.