Methods
D
K
N
Instance Public methods
discard(k = nil)

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

flash.keep                 # keep entire flash available for the next action
flash.discard(:warning)    # discard the "warning" entry (it'll still be available for the current action)

Source: show 

# File rails/actionpack/lib/action_controller/flash.rb, line 103
def discard(k = nil)
  use(k)
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

Source: show 

# File rails/actionpack/lib/action_controller/flash.rb, line 95
def keep(k = nil)
  use(k, false)
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'].

Source: show 

# File rails/actionpack/lib/action_controller/flash.rb, line 87
def now
  FlashNow.new self
end