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Covariant parameter types are designated with a + before the type parameter. A covariant type is useful for read-only containers. Scala s List is defined as List[+T], which means that it s covariant on type T. List is covariant because if you pass a List[String] to a method that expects a List[Any], then every element of the List satisfies the requirement that is an Any and we cannot change the contents of the List. Let s define an immutable class, Getable. Once an instance of Getable is created, it cannot change, so we can mark its type, T, as covariant.

s.version = '0.0.1'

Asserts the location of the currently loaded page; for example, that it s /forum and not /catalog Asserts that the title of the currently loaded page is correct Asserts that the specified text is present on the page

The summary line is displayed by gem list, and can be useful to people prior to installing the gem. Simply put together a short description of your library/gem here:

scala> class Getable[+T](val data: T)

s.summary = "StringExtend adds useful features to the String class"

Let s define a method that takes a Getable[Any]:

The files attribute accepts an array of all the files to include within the gem. In this case you use Dir.glob to get an array of all the files under the current directory:

birt code 39, birt upc-a, birt pdf 417, birt gs1 128, birt barcode open source, birt code 128

Verification and wait for assertions use the same format. Use verifyLocation(/forum) to verify that the location is /forum, and use waitForLocation(/forum) to wait for that page to be loaded.

s.files = Dir.glob("**/**/**")

scala> def get(in: Getable[Any]) {println("It's "+in.data)}

Last, it s possible to send extra header fields with an HTTP request by supplying an optional hash parameter to open:

Now that both Ferret and acts_as_ferret are installed, the only thing we need to make our books searchable is one line in app/models/book.rb: class Book < ActiveRecord::Base has_and_belongs_to_many :authors belongs_to :publisher acts_as_ferret :fields => [:title, :author_names] # lots of omitted code end With that single line, we have made it possible to do fast searches on books according to their titles and authors. acts_as_ferret now intercepts all create, update, and delete operations of the Book class and updates its full-text index accordingly. But wait a minute! There is no attribute author_names in the books table. That is correct. Fortunately, acts_as_ferret can index even objects instance method values, so we ll add a method called author_names to the Book model class. Change app/models/book.rb as shown here: class Book < ActiveRecord::Base has_and_belongs_to_many :authors belongs_to :publisher acts_as_ferret :fields => [:title, :author_names] file_column :cover_image validates_length_of :title, :in => 1..255 validates_presence_of :publisher validates_presence_of :authors validates_presence_of :published_at validates_numericality_of :page_count, :only_integer => true validates_numericality_of :price validates_format_of :isbn, :with => /[0-9\-xX]{13}/ validates_uniqueness_of :isbn def author_names self.authors.map do |a| a.name end.join(", ") rescue "" end end

require 'open-uri' f = open('http://www.rubyinside.com/test.txt', {'User-Agent' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)'}) puts f.read

We define an instance of Getable[String]:

In this example, a user agent header is sent with the HTTP request that makes it appear as if you re using Internet Explorer to request the remote file. Sending a user agent header can be a useful technique if you re dealing with a Web site that returns different information to different types of browsers. Ideally, however, you should use a User-Agent header that reflects the name of your program.

scala> val gs = new Getable("String")

Web pages are created using a variety of technologies; the most popular is HyperText Markup Language (HTML). HTML is a language that can be represented in plain text and is composed of numerous tags that indicate the meaning of each part of the document. For example: