class Mime::Type

end
end
end
format.xml { render xml: @post }
format.ics { render text: @post.to_ics, mime_type: Mime::Type }
format.html
respond_to do |format|
@post = Post.find(params)
def show
class PostsController < ActionController::Base
Encapsulates the notion of a mime type. Can be used at render time, for example, with:

def ==(mime_type) 

def ==(mime_type)
  return false if mime_type.blank?
  (@synonyms + [ self ]).any? do |synonym|
    synonym.to_s == mime_type.to_s || synonym.to_sym == mime_type.to_sym
  end
end

def ===(list) 

def ===(list)
  if list.is_a?(Array)
    (@synonyms + [ self ]).any? { |synonym| list.include?(synonym) }
  else
    super
  end
end

def =~(mime_type) 

def =~(mime_type)
  return false if mime_type.blank?
  regexp = Regexp.new(Regexp.quote(mime_type.to_s))
  (@synonyms + [ self ]).any? do |synonym|
    synonym.to_s =~ regexp
  end
end

def html? 

def html?
  @@html_types.include?(to_sym) || @string =~ /html/
end

def initialize(string, symbol = nil, synonyms = []) 

def initialize(string, symbol = nil, synonyms = [])
  @symbol, @synonyms = symbol, synonyms
  @string = string
end

def lookup(string) 

def lookup(string)
  LOOKUP[string]
end

def lookup_by_extension(extension) 

def lookup_by_extension(extension)
  EXTENSION_LOOKUP[extension.to_s]
end

def method_missing(method, *args) 

def method_missing(method, *args)
  if method.to_s.ends_with? '?'
    method[0..-2].downcase.to_sym == to_sym
  else
    super
  end
end

def parse(accept_header) 

def parse(accept_header)
  if !accept_header.include?(',')
    accept_header = accept_header.split(PARAMETER_SEPARATOR_REGEXP).first
    parse_trailing_star(accept_header) || [Mime::Type.lookup(accept_header)].compact
  else
    list, index = AcceptList.new, 0
    accept_header.split(',').each do |header|
      params, q = header.split(PARAMETER_SEPARATOR_REGEXP)
      if params.present?
        params.strip!
        params = parse_trailing_star(params) || [params]
        params.each do |m|
          list << AcceptItem.new(index, m.to_s, q)
          index += 1
        end
      end
    end
    list.assort!
  end
end

def parse_data_with_trailing_star(input)

Mime::XML, Mime::YAML, Mime::ATOM, Mime::JSON, Mime::RSS, Mime::URL_ENCODED_FORM].
For an input of 'application', returns [Mime::HTML, Mime::JS,

Mime::HTML, Mime::CSS, Mime::CSV, Mime::JS, Mime::YAML, Mime::TEXT].
For an input of 'text', returns [Mime::JSON, Mime::XML, Mime::ICS, 
def parse_data_with_trailing_star(input)
  Mime::SET.select { |m| m =~ input }
end

def parse_trailing_star(accept_header) 

def parse_trailing_star(accept_header)
  parse_data_with_trailing_star($1) if accept_header =~ TRAILING_STAR_REGEXP
end

def ref 

def ref
  to_sym || to_s
end

def register(string, symbol, mime_type_synonyms = [], extension_synonyms = [], skip_lookup = false) 

def register(string, symbol, mime_type_synonyms = [], extension_synonyms = [], skip_lookup = false)
  Mime.const_set(symbol.upcase, Type.new(string, symbol, mime_type_synonyms))
  new_mime = Mime.const_get(symbol.upcase)
  SET << new_mime
  ([string] + mime_type_synonyms).each { |str| LOOKUP[str] = SET.last } unless skip_lookup
  ([symbol] + extension_synonyms).each { |ext| EXTENSION_LOOKUP[ext.to_s] = SET.last }
  @register_callbacks.each do |callback|
    callback.call(new_mime)
  end
end

def register_alias(string, symbol, extension_synonyms = [])

rendering different HTML versions depending on the user agent, like an iPhone.
Registers an alias that's not used on mime type lookup, but can be referenced directly. Especially useful for 
def register_alias(string, symbol, extension_synonyms = [])
  register(string, symbol, [], extension_synonyms, true)
end

def register_callback(&block) 

def register_callback(&block)
  @register_callbacks << block
end

def respond_to_missing?(method, include_private = false) #:nodoc:

:nodoc: 
def respond_to_missing?(method, include_private = false) #:nodoc:
  method.to_s.ends_with? '?'
end

def to_a; end 

def to_a; end

def to_ary; end 

def to_ary; end

def to_s 

def to_s
  @string
end

def to_str 

def to_str
  to_s
end

def to_sym 

def to_sym
  @symbol
end

def unregister(symbol)

Mime::Type.unregister(:mobile)

Usage:

This method is opposite of register method. 
def unregister(symbol)
  symbol = symbol.upcase
  mime = Mime.const_get(symbol)
  Mime.instance_eval { remove_const(symbol) }
  SET.delete_if { |v| v.eql?(mime) }
  LOOKUP.delete_if { |_,v| v.eql?(mime) }
  EXTENSION_LOOKUP.delete_if { |_,v| v.eql?(mime) }
end