Class: ActionController::Flash::FlashHash

Inherits:
Hash
  • Object
show all
Defined in:
lib/action_controller/flash.rb

Constant Summary collapse

@@avoid_sweep = 
false

Instance Method Summary collapse

Constructor Details

#initialize ⇒ FlashHash

:nodoc:



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# File 'lib/action_controller/flash.rb', line 49

def initialize #:nodoc:
  super
  @used = {}
end

Instance Method Details

#[]=(k, v) ⇒ Object

:nodoc:



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# File 'lib/action_controller/flash.rb', line 54

def []=(k, v) #:nodoc:
  keep(k)
  super
end

#discard(k = nil) ⇒ Object

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)



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# File 'lib/action_controller/flash.rb', line 97

def discard(k=nil)
  use(k)
end

#keep(k = nil) ⇒ Object

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



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# File 'lib/action_controller/flash.rb', line 89

def keep(k=nil)
  use(k, false)
end

#now ⇒ Object

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'].



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# File 'lib/action_controller/flash.rb', line 81

def now
  FlashNow.new self
end

#replace(h) ⇒ Object

:nodoc:



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# File 'lib/action_controller/flash.rb', line 66

def replace h #:nodoc:
  @used = {}
  super
end

#sweep ⇒ Object

Mark for removal entries that were kept, and delete unkept ones.

This method is called automatically by filters, so you generally don’t need to care about it.



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# File 'lib/action_controller/flash.rb', line 104

def sweep #:nodoc:
  return if @@avoid_sweep
  keys.each do |k| 
    unless @used[k]
      use(k)
    else
      delete(k)
      @used.delete(k)
    end
  end
  (@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
end

#update(h) ⇒ Object Also known as: merge!

:nodoc:



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# File 'lib/action_controller/flash.rb', line 59

def update h #:nodoc:
  h.keys.each{|k| discard k }
  super
end