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Class: ActionDispatch::MiddlewareStack

Relationships & Source Files
Namespace Children
Classes:
InstrumentationProxy, Middleware
Extension / Inclusion / Inheritance Descendants
Subclasses:
ActionController::MiddlewareStack
Super Chains via Extension / Inclusion / Inheritance
Instance Chain:
self, ::Enumerable, ::ActiveSupport::EnumerableCoreExt::Constants
Inherits: Object
Defined in: actionpack/lib/action_dispatch/middleware/stack.rb

Overview

Read more about [Rails middleware stack](guides.rubyonrails.org/rails_on_rack.html#action-dispatcher-middleware-stack) in the guides.

Class Method Summary

Instance Attribute Summary

::Enumerable - Included

#many?

Returns true if the enumerable has more than 1 element.

Instance Method Summary

::Enumerable - Included

#compact_blank

Returns a new ::Array without the blank items.
#exclude?

The negative of the Enumerable#include?.
#excluding

Returns a copy of the enumerable excluding the specified elements.
#in_order_of

Returns a new ::Array where the order has been set to that provided in the series, based on the key of the objects in the original enumerable.
#including

Returns a new array that includes the passed elements.
#index_by

Convert an enumerable to a hash, using the block result as the key and the element as the value.
#index_with

Convert an enumerable to a hash, using the element as the key and the block result as the value.
#maximum

Calculates the maximum from the extracted elements.
#minimum

Calculates the minimum from the extracted elements.
#pick

Extract the given key from the first element in the enumerable.
#pluck

Extract the given key from each element in the enumerable.
#sole

Returns the sole item in the enumerable.
#without

Alias for Enumerable#excluding.
#as_json

::ActiveSupport::EnumerableCoreExt::Constants - Included

#const_missing

Constructor Details

.new(*args) {|_self| ... } ⇒ MiddlewareStack

Yields:

  • (_self)

Yield Parameters:

  • _self (MiddlewareStack) —

    the object that the method was called on

[ GitHub ] 

  


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



def initialize(*args)
  @middlewares = []
  yield(self) if block_given?
end


  







Instance Attribute Details



  

    #middlewares   (rw)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 74



attr_accessor :middlewares


  







Instance Method Details



  

    #[](i)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 93



def [](i)
  middlewares[i]
end


  








  

    #assert_index(index, where)   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 178



def assert_index(index, where)
  i = index.is_a?(Integer) ? index : index_of(index)
  raise "No such middleware to insert #{where}: #{index.inspect}" unless i
  i
end


  








  

    #build(app = nil, &block)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 166



def build(app = nil, &block)
  instrumenting = ActiveSupport::Notifications.notifier.listening?(InstrumentationProxy::EVENT_NAME)
  middlewares.freeze.reverse.inject(app || block) do |a, e|
    if instrumenting
      e.build_instrumented(a)
    else
      e.build(a)
    end
  end
end


  








  

    #build_middleware(klass, args, block)   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 184



def build_middleware(klass, args, block)
  Middleware.new(klass, args, block)
end


  








  

    #delete(target)  
  



  

    

Deletes a middleware from the middleware stack.



Returns the array of middlewares not including the deleted item, or returns nil if the target is not found.


  



  [ GitHub ]


  

  


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



def delete(target)
  middlewares.reject! { |m| m.name == target.name }
end


  








  

    #delete!(target)  
  



  

    

Deletes a middleware from the middleware stack.



Returns the array of middlewares not including the deleted item, or raises RuntimeError if the target is not found.


  



  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 139



def delete!(target)
  delete(target) || (raise "No such middleware to remove: #{target.inspect}")
end


  








  

    #each(&block)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 81



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


  








  

    #index_of(klass)   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 188



def index_of(klass)
  middlewares.index do |m|
    m.name == klass.name
  end
end


  








  

    #initialize_copy(other)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 102



def initialize_copy(other)
  self.middlewares = other.middlewares.dup
end


  








  

    #insert(index, klass, *args, &block)  
    Also known as: #insert_before
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 106



def insert(index, klass, *args, &block)
  index = assert_index(index, :before)
  middlewares.insert(index, build_middleware(klass, args, block))
end


  








  

    #insert_after(index, *args, &block)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 114



def insert_after(index, *args, &block)
  index = assert_index(index, :after)
  insert(index + 1, *args, &block)
end


  








  

    #insert_before(index, klass, *args, &block)  
  



  

    

Alias for #insert.


  



  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 112



alias_method :insert_before, :insert


  








  

    #last  
  

  [ GitHub ]


  

  


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



def last
  middlewares.last
end


  








  

    #move(target, source)  
    Also known as: #move_before
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 143



def move(target, source)
  source_index = assert_index(source, :before)
  source_middleware = middlewares.delete_at(source_index)

  target_index = assert_index(target, :before)
  middlewares.insert(target_index, source_middleware)
end


  








  

    #move_after(target, source)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 153



def move_after(target, source)
  source_index = assert_index(source, :after)
  source_middleware = middlewares.delete_at(source_index)

  target_index = assert_index(target, :after)
  middlewares.insert(target_index + 1, source_middleware)
end


  








  

    #move_before(target, source)  
  



  

    

Alias for #move.


  



  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 151



alias_method :move_before, :move


  








  

    #size  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 85



def size
  middlewares.size
end


  








  

    #swap(target, *args, &block)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 120



def swap(target, *args, &block)
  index = assert_index(target, :before)
  insert(index, *args, &block)
  middlewares.delete_at(index + 1)
end


  








  

    #unshift(klass, *args, &block)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 97



def unshift(klass, *args, &block)
  middlewares.unshift(build_middleware(klass, args, block))
end


  








  

    #use(klass, *args, &block)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/middleware/stack.rb', line 161



def use(klass, *args, &block)
  middlewares.push(build_middleware(klass, args, block))
end