Methods
Public Instance methods
discard(k = nil)

Marks the entire flash or a single flash entry to be discarded by the end of the current action: 

    flash.discard              # discard the entire flash at the end of the current action
    flash.discard(:warning)    # discard only the "warning" entry at the end of the current action

[ show source ]

     # File actionpack/lib/action_controller/flash.rb, line 107
107:       def discard(k = nil)
108:         use(k)
109:       end
keep(k = nil)

Keeps either the entire current flash or a specific flash entry available for the next action: 

   flash.keep            # keeps the entire flash
   flash.keep(:notice)   # keeps only the "notice" entry, the rest of the flash is discarded

[ show source ]

     # File actionpack/lib/action_controller/flash.rb, line 99
 99:       def keep(k = nil)
100:         use(k, false)
101:       end
now()

Sets a flash that will not be available to the next action, only to the current. 

    flash.now[:message] = "Hello current action"

This method enables you to use the flash as a central messaging system in your app. When you need to pass an object to the next action, you use the standard flash assign ([]=). When you need to pass an object to the current action, you use now, and your object will vanish when the current action is done.

Entries set via now are accessed the same way as standard entries: flash[‘my-key’].

[ show source ]

    # File actionpack/lib/action_controller/flash.rb, line 91
91:       def now
92:         FlashNow.new(self)
93:       end
store(session, key = "flash")

[ show source ]

     # File actionpack/lib/action_controller/flash.rb, line 128
128:       def store(session, key = "flash")
129:         return if self.empty?
130:         session[key] = self
131:       end