```ruby
module ActsAsTenant
  module ControllerExtensions
  
    # this method allows setting the current_account by reading the subdomain and looking
    # it up in the tenant-model passed to the method (defaults to Account). The method will 
    # look for the subdomain in a column referenced by the second argument (defaults to subdomain).
  
    def set_current_tenant_by_subdomain(tenant = :account, column = :subdomain )
      self.class_eval do
        cattr_accessor :tenant_class, :tenant_column
        attr_accessor :current_tenant
      end
    
      self.tenant_class = tenant.to_s.capitalize.constantize
      self.tenant_column = column.to_sym
    
      self.class_eval do
        before_filter :find_tenant_by_subdomain

        private
          def find_tenant_by_subdomain
            ActsAsTenant.current_tenant = tenant_class.where(tenant_column => request.subdomains.first).first
            @current_tenant_instance = ActsAsTenant.current_tenant
          end
      end
    end
  
    def set_current_tenant_to(current_tenant_object)
      self.class_eval do
        cattr_accessor :tenant_class
        attr_accessor :current_tenant
        before_filter lambda { @current_tenant_instance = ActsAsTenant.current_tenant = current_tenant_object }
      end
    end
  
    # helper method to have the current_tenant available in the controller  
    def current_tenant
      ActsAsTenant.current_tenant
    end
    
    ActiveSupport.on_load(:action_controller) do
      helper_method :current_tenant
    end
    
  end
end```

Fix to get current_tenant working
user
```ruby
module ActsAsTenant
  module ControllerExtensions
    extend ActiveSupport::Concern
      
    included do
      helper_method :current_tenant
    end
  
    module ClassMethods
      
      # this method allows setting the current_account by reading the subdomain and looking
      # it up in the tenant-model passed to the method (defaults to Account). The method will 
      # look for the subdomain in a column referenced by the second argument (defaults to subdomain).
      def set_current_tenant_by_subdomain(tenant = :account, column = :subdomain )
        self.class_eval do
          cattr_accessor :tenant_class, :tenant_column
          attr_accessor :current_tenant
        end
  
        self.tenant_class = tenant.to_s.capitalize.constantize
        self.tenant_column = column.to_sym
  
        self.class_eval do
          before_filter :find_tenant_by_subdomain

          private
            def find_tenant_by_subdomain
              ActsAsTenant.current_tenant = tenant_class.where(tenant_column => request.subdomains.first).first
              @current_tenant_instance = ActsAsTenant.current_tenant
            end
        end
      end

      def set_current_tenant_to(current_tenant_object)
        self.class_eval do
          cattr_accessor :tenant_class
          attr_accessor :current_tenant
          before_filter lambda { @current_tenant_instance = ActsAsTenant.current_tenant = current_tenant_object }
        end
      end

      # helper method to have the current_tenant available in the controller  
      def current_tenant
        ActsAsTenant.current_tenant
      end
  
  #ActiveSupport.on_load(:action_controller) do
  #  helper_method :current_tenant
  #end
    end
  end
end```
assistant