Encapsulates the notion of a mime type. Can be used at render time, for example, with:

class PostsController < ActionController::Base
  def show
    @post = Post.find(params[:id])

    respond_to do |format|
      format.html
      format.ics { render text: post.to_ics, mime_type: Mime::Type["text/calendar"]  }
      format.xml { render xml: @people }
    end
  end
end
Methods
#
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Constants
TRAILING_STAR_REGEXP = /(text|application)\/\*/
 
PARAMETER_SEPARATOR_REGEXP = /;\s*\w+="?\w+"?/
 
Attributes
[R] symbol
Class Public methods
new(string, symbol = nil, synonyms = [])
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 228
def initialize(string, symbol = nil, synonyms = [])
  @symbol, @synonyms = symbol, synonyms
  @string = string
end
Instance Public methods
==(mime_type)
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 257
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
===(list)
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 249
def ===(list)
  if list.is_a?(Array)
    (@synonyms + [ self ]).any? { |synonym| list.include?(synonym) }
  else
    super
  end
end
=~(mime_type)
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 264
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
html?()
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 272
def html?
  @@html_types.include?(to_sym) || @string =~ /html/
end
lookup(string)
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 148
def lookup(string)
  LOOKUP[string]
end
lookup_by_extension(extension)
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 152
def lookup_by_extension(extension)
  EXTENSION_LOOKUP[extension.to_s]
end
parse(accept_header)
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 176
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
parse_data_with_trailing_star(input)

For an input of 'text', returns [Mime::JSON, Mime::XML, Mime::ICS, Mime::HTML, Mime::CSS, Mime::CSV, Mime::JS, Mime::YAML, Mime::TEXT].

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

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 208
def parse_data_with_trailing_star(input)
  Mime::SET.select { |m| m =~ input }
end
parse_trailing_star(accept_header)
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 199
def parse_trailing_star(accept_header)
  parse_data_with_trailing_star($1) if accept_header =~ TRAILING_STAR_REGEXP
end
ref()
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 245
def ref
  to_sym || to_s
end
register(string, symbol, mime_type_synonyms = [], extension_synonyms = [], skip_lookup = false)
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 162
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
register_alias(string, symbol, extension_synonyms = [])

Registers an alias that's not used on mime type lookup, but can be referenced directly. Especially useful for rendering different HTML versions depending on the user agent, like an iPhone.

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 158
def register_alias(string, symbol, extension_synonyms = [])
  register(string, symbol, [], extension_synonyms, true)
end
register_callback(&block)
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 144
def register_callback(&block)
  @register_callbacks << block
end
to_s()
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 233
def to_s
  @string
end
to_str()
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 237
def to_str
  to_s
end
to_sym()
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 241
def to_sym
  @symbol
end
unregister(symbol)

This method is opposite of register method.

Usage:

Mime::Type.unregister(:mobile)
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 217
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