1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
module AbstractController
# In <b>routes.rb</b> one defines URL-to-controller mappings, but the reverse
# is also possible: an URL can be generated from one of your routing definitions.
# URL generation functionality is centralized in this module.
#
# See AbstractController::Routing and AbstractController::Resources for general
# information about routing and routes.rb.
#
# <b>Tip:</b> If you need to generate URLs from your models or some other place,
# then AbstractController::UrlFor is what you're looking for. Read on for
# an introduction.
#
# == URL generation from parameters
#
# As you may know, some functions - such as AbstractController::Base#url_for
# and ActionView::Helpers::UrlHelper#link_to, can generate URLs given a set
# of parameters. For example, you've probably had the chance to write code
# like this in one of your views:
#
# <%= link_to('Click here', :controller => 'users',
# :action => 'new', :message => 'Welcome!') %>
#
# #=> Generates a link to: /users/new?message=Welcome%21
#
# link_to, and all other functions that require URL generation functionality,
# actually use AbstractController::UrlFor under the hood. And in particular,
# they use the AbstractController::UrlFor#url_for method. One can generate
# the same path as the above example by using the following code:
#
# include UrlFor
# url_for(:controller => 'users',
# :action => 'new',
# :message => 'Welcome!',
# :only_path => true)
# # => "/users/new?message=Welcome%21"
#
# Notice the <tt>:only_path => true</tt> part. This is because UrlFor has no
# information about the website hostname that your Rails app is serving. So if you
# want to include the hostname as well, then you must also pass the <tt>:host</tt>
# argument:
#
# include UrlFor
# url_for(:controller => 'users',
# :action => 'new',
# :message => 'Welcome!',
# :host => 'www.example.com') # Changed this.
# # => "http://www.example.com/users/new?message=Welcome%21"
#
# By default, all controllers and views have access to a special version of url_for,
# that already knows what the current hostname is. So if you use url_for in your
# controllers or your views, then you don't need to explicitly pass the <tt>:host</tt>
# argument.
#
# For convenience reasons, mailers provide a shortcut for AbstractController::UrlFor#url_for.
# So within mailers, you only have to type 'url_for' instead of 'AbstractController::UrlFor#url_for'
# in full. However, mailers don't have hostname information, and what's why you'll still
# have to specify the <tt>:host</tt> argument when generating URLs in mailers.
#
#
# == URL generation for named routes
#
# UrlFor also allows one to access methods that have been auto-generated from
# named routes. For example, suppose that you have a 'users' resource in your
# <b>routes.rb</b>:
#
# map.resources :users
#
# This generates, among other things, the method <tt>users_path</tt>. By default,
# this method is accessible from your controllers, views and mailers. If you need
# to access this auto-generated method from other places (such as a model), then
# you can do that by including AbstractController::UrlFor in your class:
#
# class User < ActiveRecord::Base
# include AbstractController::UrlFor
#
# def base_uri
# user_path(self)
# end
# end
#
# User.find(1).base_uri # => "/users/1"
#
module UrlFor
extend ActiveSupport::Concern
included do
ActionController::Routing::Routes.install_helpers(self)
extlib_inheritable_accessor :default_url_options,
:instance_writer => false, :instance_reader => false
self.default_url_options ||= {}
end
# Overwrite to implement a number of default options that all url_for-based methods will use. The default options should come in
# the form of a hash, just like the one you would use for url_for directly. Example:
#
# def default_url_options(options)
# { :project => @project.active? ? @project.url_name : "unknown" }
# end
#
# As you can infer from the example, this is mostly useful for situations where you want to centralize dynamic decisions about the
# urls as they stem from the business domain. Please note that any individual url_for call can always override the defaults set
# by this method.
def default_url_options(options = nil)
self.class.default_url_options
end
def rewrite_options(options) #:nodoc:
if options.delete(:use_defaults) != false && (defaults = default_url_options(options))
defaults.merge(options)
else
options
end
end
# Generate a url based on the options provided, default_url_options and the
# routes defined in routes.rb. The following options are supported:
#
# * <tt>:only_path</tt> - If true, the relative url is returned. Defaults to +false+.
# * <tt>:protocol</tt> - The protocol to connect to. Defaults to 'http'.
# * <tt>:host</tt> - Specifies the host the link should be targeted at.
# If <tt>:only_path</tt> is false, this option must be
# provided either explicitly, or via +default_url_options+.
# * <tt>:port</tt> - Optionally specify the port to connect to.
# * <tt>:anchor</tt> - An anchor name to be appended to the path.
# * <tt>:skip_relative_url_root</tt> - If true, the url is not constructed using the
# +relative_url_root+ set in AbstractController::Base.relative_url_root.
# * <tt>:trailing_slash</tt> - If true, adds a trailing slash, as in "/archive/2009/"
#
# Any other key (<tt>:controller</tt>, <tt>:action</tt>, etc.) given to
# +url_for+ is forwarded to the Routes module.
#
# Examples:
#
# url_for :controller => 'tasks', :action => 'testing', :host=>'somehost.org', :port=>'8080' # => 'http://somehost.org:8080/tasks/testing'
# url_for :controller => 'tasks', :action => 'testing', :host=>'somehost.org', :anchor => 'ok', :only_path => true # => '/tasks/testing#ok'
# url_for :controller => 'tasks', :action => 'testing', :trailing_slash=>true # => 'http://somehost.org/tasks/testing/'
# url_for :controller => 'tasks', :action => 'testing', :host=>'somehost.org', :number => '33' # => 'http://somehost.org/tasks/testing?number=33'
def url_for(options = {})
options ||= {}
case options
when String
options
when Hash
_url_rewriter.rewrite(rewrite_options(options))
else
polymorphic_url(options)
end
end
protected
def _url_rewriter
ActionController::UrlRewriter
end
end
end
|
