Class: ActionDispatch::Flash::FlashHash

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/action_dispatch/middleware/flash.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(flashes = {}, discard = []) ⇒ FlashHash

:nodoc:



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# File 'lib/action_dispatch/middleware/flash.rb', line 94

def initialize(flashes = {}, discard = []) #:nodoc:
  @discard = Set.new(discard)
  @flashes = flashes
  @now     = nil
end

Class Method Details

.from_session_value(value) ⇒ Object 



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# File 'lib/action_dispatch/middleware/flash.rb', line 76

def self.from_session_value(value)
  flash = case value
          when FlashHash # Rails 3.1, 3.2
            new(value.instance_variable_get(:@flashes), value.instance_variable_get(:@used))
          when Hash # Rails 4.0
            new(value['flashes'], value['discard'])
          else
            new
          end

  flash.tap(&:sweep)
end

Instance Method Details

#[](k) ⇒ Object 



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# File 'lib/action_dispatch/middleware/flash.rb', line 113

def [](k)
  @flashes[k]
end

#[]=(k, v) ⇒ Object 



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# File 'lib/action_dispatch/middleware/flash.rb', line 108

def []=(k, v)
  @discard.delete k
  @flashes[k] = v
end

#alert ⇒ Object

Convenience accessor for flash[:alert].



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# File 'lib/action_dispatch/middleware/flash.rb', line 211

def alert
  self[:alert]
end

#alert=(message) ⇒ Object

Convenience accessor for flash[:alert]=.



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# File 'lib/action_dispatch/middleware/flash.rb', line 216

def alert=(message)
  self[:alert] = message
end

#clear ⇒ Object 



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# File 'lib/action_dispatch/middleware/flash.rb', line 145

def clear
  @discard.clear
  @flashes.clear
end

#delete(key) ⇒ Object 



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# File 'lib/action_dispatch/middleware/flash.rb', line 131

def delete(key)
  @discard.delete key
  @flashes.delete key
  self
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.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



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# File 'lib/action_dispatch/middleware/flash.rb', line 197

def discard(k = nil)
  @discard.merge Array(k || keys)
  k ? self[k] : self
end

#each(&block) ⇒ Object 



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# File 'lib/action_dispatch/middleware/flash.rb', line 150

def each(&block)
  @flashes.each(&block)
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/action_dispatch/middleware/flash.rb', line 141

def empty?
  @flashes.empty?
end

#initialize_copy(other) ⇒ Object 



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# File 'lib/action_dispatch/middleware/flash.rb', line 100

def initialize_copy(other)
  if other.now_is_loaded?
    @now = other.now.dup
    @now.flash = self
  end
  super
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_dispatch/middleware/flash.rb', line 188

def keep(k = nil)
  @discard.subtract Array(k || keys)
  k ? self[k] : self
end

#key?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/action_dispatch/middleware/flash.rb', line 127

def key?(name)
  @flashes.key? name
end

#keys ⇒ Object 



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# File 'lib/action_dispatch/middleware/flash.rb', line 123

def keys
  @flashes.keys
end

#notice ⇒ Object

Convenience accessor for flash[:notice].



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# File 'lib/action_dispatch/middleware/flash.rb', line 221

def notice
  self[:notice]
end

#notice=(message) ⇒ Object

Convenience accessor for flash[:notice]=.



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# File 'lib/action_dispatch/middleware/flash.rb', line 226

def notice=(message)
  self[:notice] = message
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'].

Also, brings two convenience accessors:

flash.now.alert = "Beware now!"
# Equivalent to flash.now[:alert] = "Beware now!"

flash.now.notice = "Good luck now!"
# Equivalent to flash.now[:notice] = "Good luck now!"



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# File 'lib/action_dispatch/middleware/flash.rb', line 180

def now
  @now ||= FlashNow.new(self)
end

#replace(h) ⇒ Object

:nodoc:



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# File 'lib/action_dispatch/middleware/flash.rb', line 156

def replace(h) #:nodoc:
  @discard.clear
  @flashes.replace h
  self
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_dispatch/middleware/flash.rb', line 205

def sweep #:nodoc:
  @discard.each { |k| @flashes.delete k }
  @discard.replace @flashes.keys
end

#to_hash ⇒ Object 



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# File 'lib/action_dispatch/middleware/flash.rb', line 137

def to_hash
  @flashes.dup
end

#to_session_value ⇒ Object 



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# File 'lib/action_dispatch/middleware/flash.rb', line 89

def to_session_value
  return nil if empty?
  {'discard' => @discard.to_a, 'flashes' => @flashes}
end

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

:nodoc:



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# File 'lib/action_dispatch/middleware/flash.rb', line 117

def update(h) #:nodoc:
  @discard.subtract h.keys
  @flashes.update h
  self
end