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git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3151 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
172 lines
5.6 KiB
Ruby
172 lines
5.6 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] = "Successfully 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] = "Successfully 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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#
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# See docs on the FlashHash class for more details about the flash.
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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(:sweep_flash)
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end
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class FlashNow #:nodoc:
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def initialize flash
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@flash = flash
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end
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def []=(k, v)
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@flash[k] = v
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@flash.discard(k)
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v
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end
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def [](k)
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@flash[k]
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end
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end
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class FlashHash < Hash
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@@avoid_sweep = false
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cattr_accessor :avoid_sweep
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def initialize #:nodoc:
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super
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@used = {}
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end
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def []=(k, v) #:nodoc:
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keep(k)
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super
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end
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def update h #:nodoc:
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h.keys.each{|k| discard k }
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super
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end
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alias merge! update
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def replace h #:nodoc:
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@used = {}
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super
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end
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# Sets a flash that will not be available to the next action, only to the current.
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#
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# flash.now[:message] = "Hello current action"
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#
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# This method enables you to use the flash as a central messaging system in your app.
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# When you need to pass an object to the next action, you use the standard flash assign (<tt>[]=</tt>).
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# When you need to pass an object to the current action, you use <tt>now</tt>, and your object will
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# vanish when the current action is done.
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#
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# Entries set via <tt>now</tt> are accessed the same way as standard entries: <tt>flash['my-key']</tt>.
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def now
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FlashNow.new self
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end
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# Keeps either the entire current flash or a specific flash entry available for the next action:
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#
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# flash.keep # keeps the entire flash
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# flash.keep(:notice) # keeps only the "notice" entry, the rest of the flash is discarded
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def keep(k=nil)
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use(k, false)
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end
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# Marks the entire flash or a single flash entry to be discarded by the end of the current action
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#
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# flash.keep # keep entire flash available for the next action
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# flash.discard(:warning) # discard the "warning" entry (it'll still be available for the current action)
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def discard(k=nil)
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use(k)
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end
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# Mark for removal entries that were kept, and delete unkept ones.
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#
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# This method is called automatically by filters, so you generally don't need to care about it.
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def sweep #:nodoc:
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return if @@avoid_sweep
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keys.each do |k|
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unless @used[k]
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use(k)
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else
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delete(k)
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@used.delete(k)
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end
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end
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(@used.keys - keys).each{|k| @used.delete k } # clean up after keys that could have been left over by calling reject! or shift on the flash
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end
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private
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# Used internally by the <tt>keep</tt> and <tt>discard</tt> methods
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# use() # marks the entire flash as used
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# use('msg') # marks the "msg" entry as used
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# use(nil, false) # marks the entire flash as unused (keeps it around for one more action)
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# use('msg', false) # marks the "msg" entry as unused (keeps it around for one more action)
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def use(k=nil, v=true)
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unless k.nil?
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@used[k] = v
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else
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keys.each{|key| use key, v }
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end
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end
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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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# Note that if sessions are disabled only flash.now will work.
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def flash #:doc:
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# @session = Hash.new if sessions are disabled
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if @session.is_a?(Hash)
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@__flash ||= FlashHash.new
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# otherwise, @session is a CGI::Session or a TestSession
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else
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@session['flash'] ||= FlashHash.new
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end
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end
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# deprecated. use <tt>flash.keep</tt> instead
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def keep_flash #:doc:
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warn 'keep_flash is deprecated; use flash.keep instead.'
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flash.keep
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end
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private
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# marks flash entries as used and expose the flash to the view
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def fire_flash
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flash.discard
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@assigns["flash"] = flash
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end
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# deletes the flash entries that were not marked for keeping
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def sweep_flash
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flash.sweep
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end
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end
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end
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