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Diffstat (limited to 'actionpack/lib/action_controller/flash.rb')
| -rw-r--r-- | actionpack/lib/action_controller/flash.rb | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/flash.rb b/actionpack/lib/action_controller/flash.rb new file mode 100644 index 0000000000..220ed8c77a --- /dev/null +++ b/actionpack/lib/action_controller/flash.rb @@ -0,0 +1,65 @@ +module ActionController #:nodoc: + # The flash provides a way to pass temporary objects between actions. Anything you place in the flash will be exposed + # to the very next action and then cleared out. This is a great way of doing notices and alerts, such as a create action + # that sets <tt>flash["notice"] = "Succesfully created"</tt> before redirecting to a display action that can then expose + # the flash to its template. Actually, that exposure is automatically done. Example: + # + # class WeblogController < ActionController::Base + # def create + # # save post + # flash["notice"] = "Succesfully created post" + # redirect_to :action => "display", :params => { "id" => post.id } + # end + # + # def display + # # doesn't need to assign the flash notice to the template, that's done automatically + # end + # end + # + # display.rhtml + # <% if @flash["notice"] %><div class="notice"><%= @flash["notice"] %></div><% end %> + # + # This example just places a string in the flash, but you can put any object in there. And of course, you can put as many + # as you like at a time too. Just remember: They'll be gone by the time the next action has been performed. + module Flash + def self.append_features(base) #:nodoc: + super + base.before_filter(:fire_flash) + base.after_filter(:clear_flash) + end + + protected + # Access the contents of the flash. Use <tt>flash["notice"]</tt> to read a notice you put there or + # <tt>flash["notice"] = "hello"</tt> to put a new one. + def flash #:doc: + if @session["flash"].nil? + @session["flash"] = {} + @session["flashes"] ||= 0 + end + @session["flash"] + end + + # Can be called by any action that would like to keep the current content of the flash around for one more action. + def keep_flash #:doc: + @session["flashes"] = 0 + end + + private + # Records that the contents of @session["flash"] was flashed to the action + def fire_flash + if @session["flash"] + @session["flashes"] += 1 unless @session["flash"].empty? + @assigns["flash"] = @session["flash"] + else + @assigns["flash"] = {} + end + end + + def clear_flash + if @session["flash"] && (@session["flashes"].nil? || @session["flashes"] >= 1) + @session["flash"] = {} + @session["flashes"] = 0 + end + end + end +end
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