+ unless @user.administrator?
+ flash[:error] = t'user_role.filter.not_an_administrator'
+ redirect_to :controller => 'user', :action => 'view', :display_name => @this_user.display_name
+ end
+ end
+
+ ##
+ # ensure that there is a "this_user" instance variable
+ def lookup_this_user
+ unless @this_user = User.find_by_display_name(params[:display_name])
+ @not_found_user = params[:display_name]
+ render :template => 'user/no_such_user', :status => :not_found
+ end
+ end
+
+ ##
+ # require that the given role is valid. the role is a URL
+ # parameter, so should always be present.
+ def require_valid_role
+ @role = params[:role]
+ unless UserRole::ALL_ROLES.include?(@role)
+ flash[:error] = t('user_role.filter.not_a_role', :role => @role)
+ redirect_to :controller => 'user', :action => 'view', :display_name => @this_user.display_name
+ end