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require 'builder'
module ActiveSupport #:nodoc:
module CoreExtensions #:nodoc:
module Array #:nodoc:
module Conversions
# Converts the array to a comma-separated sentence where the last element is joined by the connector word. Options:
# * <tt>:connector</tt> - The word used to join the last element in arrays with two or more elements (default: "and")
# * <tt>:skip_last_comma</tt> - Set to true to return "a, b and c" instead of "a, b, and c".
def to_sentence(options = {})
options.assert_valid_keys(:connector, :skip_last_comma)
options.reverse_merge! :connector => 'and', :skip_last_comma => false
options[:connector] = "#{options[:connector]} " unless options[:connector].nil? || options[:connector].strip == ''
case length
when 0
""
when 1
self[0].to_s
when 2
"#{self[0]} #{options[:connector]}#{self[1]}"
else
"#{self[0...-1].join(', ')}#{options[:skip_last_comma] ? '' : ','} #{options[:connector]}#{self[-1]}"
end
end
# Calls <tt>to_param</tt> on all its elements and joins the result with
# slashes. This is used by <tt>url_for</tt> in Action Pack.
def to_param
map(&:to_param).join '/'
end
# Converts an array into a string suitable for use as a URL query string,
# using the given +key+ as the param name.
#
# ['Rails', 'coding'].to_query('hobbies') # => "hobbies%5B%5D=Rails&hobbies%5B%5D=coding"
def to_query(key)
collect { |value| value.to_query("#{key}[]") } * '&'
end
def self.included(base) #:nodoc:
base.class_eval do
alias_method :to_default_s, :to_s
alias_method :to_s, :to_formatted_s
end
end
# Converts a collection of elements into a formatted string by calling
# <tt>to_s</tt> on all elements and joining them:
#
# Blog.find(:all).to_formatted_s # => "First PostSecond PostThird Post"
#
# Adding in the <tt>:db</tt> argument as the format yields a prettier
# output:
#
# Blog.find(:all).to_formatted_s(:db) # => "First Post,Second Post,Third Post"
def to_formatted_s(format = :default)
case format
when :db
if respond_to?(:empty?) && self.empty?
"null"
else
collect { |element| element.id }.join(",")
end
else
to_default_s
end
end
# Returns a string that represents this array in XML by sending
# <tt>to_xml</tt> to each element.
#
# All elements are expected to respond to <tt>to_xml</tt>, if any of
# them does not an exception is raised.
#
# The root node reflects the class name of the first element in plural
# if all elements belong to the same type and that's not <tt>Hash</tt>.
# Otherwise the root element is "records".
#
# Root children have as node name the one of the root singularized.
#
# [{:foo => 1, :bar => 2}, {:baz => 3}].to_xml
#
# <?xml version="1.0" encoding="UTF-8"?>
# <records type="array">
# <record>
# <bar type="integer">2</bar>
# <foo type="integer">1</foo>
# </record>
# <record>
# <baz type="integer">3</baz>
# </record>
# </records>
#
# The +options+ hash is passed downwards:
#
# [Message.find(:first)].to_xml(:skip_types => true)
#
# <?xml version="1.0" encoding="UTF-8"?>
# <messages>
# <message>
# <created-at>2008-03-07T09:58:18+01:00</created-at>
# <id>1</id>
# <name>1</name>
# <updated-at>2008-03-07T09:58:18+01:00</updated-at>
# <user-id>1</user-id>
# </message>
# </messages>
#
def to_xml(options = {})
raise "Not all elements respond to to_xml" unless all? { |e| e.respond_to? :to_xml }
options[:root] ||= all? { |e| e.is_a?(first.class) && first.class.to_s != "Hash" } ? first.class.to_s.underscore.pluralize : "records"
options[:children] ||= options[:root].singularize
options[:indent] ||= 2
options[:builder] ||= Builder::XmlMarkup.new(:indent => options[:indent])
root = options.delete(:root).to_s
children = options.delete(:children)
if !options.has_key?(:dasherize) || options[:dasherize]
root = root.dasherize
end
options[:builder].instruct! unless options.delete(:skip_instruct)
opts = options.merge({ :root => children })
xml = options[:builder]
if empty?
xml.tag!(root, options[:skip_types] ? {} : {:type => "array"})
else
xml.tag!(root, options[:skip_types] ? {} : {:type => "array"}) {
yield xml if block_given?
each { |e| e.to_xml(opts.merge!({ :skip_instruct => true })) }
}
end
end
end
end
end
end
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