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