File: active_record_helper.rb

package info (click to toggle)
rails 2.3.5-1.2+squeeze8
  • links: PTS, VCS
  • area: main
  • in suites: squeeze
  • size: 18,248 kB
  • ctags: 20,944
  • sloc: ruby: 122,413; makefile: 72; sql: 43; sh: 1
file content (305 lines) | stat: -rw-r--r-- 14,767 bytes parent folder | download
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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
require 'cgi'
require 'action_view/helpers/form_helper'

module ActionView
  class Base
    @@field_error_proc = Proc.new{ |html_tag, instance| "<div class=\"fieldWithErrors\">#{html_tag}</div>".html_safe }
    cattr_accessor :field_error_proc
  end

  module Helpers
    # The Active Record Helper makes it easier to create forms for records kept in instance variables. The most far-reaching is the +form+
    # method that creates a complete form for all the basic content types of the record (not associations or aggregations, though). This
    # is a great way of making the record quickly available for editing, but likely to prove lackluster for a complicated real-world form.
    # In that case, it's better to use the +input+ method and the specialized +form+ methods in link:classes/ActionView/Helpers/FormHelper.html
    module ActiveRecordHelper
      # Returns a default input tag for the type of object returned by the method. For example, if <tt>@post</tt>
      # has an attribute +title+ mapped to a +VARCHAR+ column that holds "Hello World":
      #
      #   input("post", "title")
      #   # => <input id="post_title" name="post[title]" size="30" type="text" value="Hello World" />
      def input(record_name, method, options = {})
        InstanceTag.new(record_name, method, self).to_tag(options)
      end

      # Returns an entire form with all needed input tags for a specified Active Record object. For example, if <tt>@post</tt>
      # has attributes named +title+ of type +VARCHAR+ and +body+ of type +TEXT+ then
      #
      #   form("post")
      #
      # would yield a form like the following (modulus formatting):
      #
      #   <form action='/posts/create' method='post'>
      #     <p>
      #       <label for="post_title">Title</label><br />
      #       <input id="post_title" name="post[title]" size="30" type="text" value="Hello World" />
      #     </p>
      #     <p>
      #       <label for="post_body">Body</label><br />
      #       <textarea cols="40" id="post_body" name="post[body]" rows="20"></textarea>
      #     </p>
      #     <input name="commit" type="submit" value="Create" />
      #   </form>
      #
      # It's possible to specialize the form builder by using a different action name and by supplying another
      # block renderer. For example, if <tt>@entry</tt> has an attribute +message+ of type +VARCHAR+ then
      #
      #   form("entry",
      #     :action => "sign",
      #     :input_block => Proc.new { |record, column|
      #       "#{column.human_name}: #{input(record, column.name)}<br />"
      #   })
      #
      # would yield a form like the following (modulus formatting):
      #
      #   <form action="/entries/sign" method="post">
      #     Message:
      #     <input id="entry_message" name="entry[message]" size="30" type="text" /><br />
      #     <input name="commit" type="submit" value="Sign" />
      #   </form>
      #
      # It's also possible to add additional content to the form by giving it a block, such as:
      #
      #   form("entry", :action => "sign") do |form|
      #     form << content_tag("b", "Department")
      #     form << collection_select("department", "id", @departments, "id", "name")
      #   end
      #
      # The following options are available:
      #
      # * <tt>:action</tt> - The action used when submitting the form (default: +create+ if a new record, otherwise +update+).
      # * <tt>:input_block</tt> - Specialize the output using a different block, see above.
      # * <tt>:method</tt> - The method used when submitting the form (default: +post+).
      # * <tt>:multipart</tt> - Whether to change the enctype of the form to "multipart/form-data", used when uploading a file (default: +false+).
      # * <tt>:submit_value</tt> - The text of the submit button (default: "Create" if a new record, otherwise "Update").
      def form(record_name, options = {})
        record = instance_variable_get("@#{record_name}")

        options = options.symbolize_keys
        options[:action] ||= record.new_record? ? "create" : "update"
        action = url_for(:action => options[:action], :id => record)

        submit_value = options[:submit_value] || options[:action].gsub(/[^\w]/, '').capitalize

        contents = form_tag({:action => action}, :method =>(options[:method] || 'post'), :enctype => options[:multipart] ? 'multipart/form-data': nil)
        contents.safe_concat hidden_field(record_name, :id) unless record.new_record?
        contents.safe_concat all_input_tags(record, record_name, options)
        yield contents if block_given?
        contents.safe_concat submit_tag(submit_value)
        contents.safe_concat '</form>'
      end

      # Returns a string containing the error message attached to the +method+ on the +object+ if one exists.
      # This error message is wrapped in a <tt>DIV</tt> tag, which can be extended to include a <tt>:prepend_text</tt>
      # and/or <tt>:append_text</tt> (to properly explain the error), and a <tt>:css_class</tt> to style it
      # accordingly. +object+ should either be the name of an instance variable or the actual object. The method can be
      # passed in either as a string or a symbol.
      # As an example, let's say you have a model <tt>@post</tt> that has an error message on the +title+ attribute:
      #
      #   <%= error_message_on "post", "title" %>
      #   # => <div class="formError">can't be empty</div>
      #
      #   <%= error_message_on @post, :title %>
      #   # => <div class="formError">can't be empty</div>
      #
      #   <%= error_message_on "post", "title",
      #       :prepend_text => "Title simply ",
      #       :append_text => " (or it won't work).",
      #       :css_class => "inputError" %>
      def error_message_on(object, method, *args)
        options = args.extract_options!
        unless args.empty?
          ActiveSupport::Deprecation.warn('error_message_on takes an option hash instead of separate ' +
            'prepend_text, append_text, and css_class arguments', caller)

          options[:prepend_text] = args[0] || ''
          options[:append_text] = args[1] || ''
          options[:css_class] = args[2] || 'formError'
        end
        options.reverse_merge!(:prepend_text => '', :append_text => '', :css_class => 'formError')

        if (obj = (object.respond_to?(:errors) ? object : instance_variable_get("@#{object}"))) &&
          (errors = obj.errors.on(method))
          content_tag("div",
            "#{options[:prepend_text]}#{ERB::Util.html_escape(errors.is_a?(Array) ? errors.first : errors)}#{options[:append_text]}",
            :class => options[:css_class]
          )
        else
          ''
        end
      end

      # Returns a string with a <tt>DIV</tt> containing all of the error messages for the objects located as instance variables by the names
      # given.  If more than one object is specified, the errors for the objects are displayed in the order that the object names are
      # provided.
      #
      # This <tt>DIV</tt> can be tailored by the following options:
      #
      # * <tt>:header_tag</tt> - Used for the header of the error div (default: "h2").
      # * <tt>:id</tt> - The id of the error div (default: "errorExplanation").
      # * <tt>:class</tt> - The class of the error div (default: "errorExplanation").
      # * <tt>:object</tt> - The object (or array of objects) for which to display errors,
      #   if you need to escape the instance variable convention.
      # * <tt>:object_name</tt> - The object name to use in the header, or any text that you prefer.
      #   If <tt>:object_name</tt> is not set, the name of the first object will be used.
      # * <tt>:header_message</tt> - The message in the header of the error div.  Pass +nil+
      #   or an empty string to avoid the header message altogether. (Default: "X errors
      #   prohibited this object from being saved").
      # * <tt>:message</tt> - The explanation message after the header message and before
      #   the error list.  Pass +nil+ or an empty string to avoid the explanation message
      #   altogether. (Default: "There were problems with the following fields:").
      #
      # To specify the display for one object, you simply provide its name as a parameter.
      # For example, for the <tt>@user</tt> model:
      #
      #   error_messages_for 'user'
      #
      # To specify more than one object, you simply list them; optionally, you can add an extra <tt>:object_name</tt> parameter, which
      # will be the name used in the header message:
      #
      #   error_messages_for 'user_common', 'user', :object_name => 'user'
      #
      # If the objects cannot be located as instance variables, you can add an extra <tt>:object</tt> parameter which gives the actual
      # object (or array of objects to use):
      #
      #   error_messages_for 'user', :object => @question.user
      #
      # NOTE: This is a pre-packaged presentation of the errors with embedded strings and a certain HTML structure. If what
      # you need is significantly different from the default presentation, it makes plenty of sense to access the <tt>object.errors</tt>
      # instance yourself and set it up. View the source of this method to see how easy it is.
      def error_messages_for(*params)
        options = params.extract_options!.symbolize_keys

        if object = options.delete(:object)
          objects = Array.wrap(object)
        else
          objects = params.collect {|object_name| instance_variable_get("@#{object_name}") }.compact
        end

        count  = objects.inject(0) {|sum, object| sum + object.errors.count }
        unless count.zero?
          html = {}
          [:id, :class].each do |key|
            if options.include?(key)
              value = options[key]
              html[key] = value unless value.blank?
            else
              html[key] = 'errorExplanation'
            end
          end
          options[:object_name] ||= params.first

          I18n.with_options :locale => options[:locale], :scope => [:activerecord, :errors, :template] do |locale|
            header_message = if options.include?(:header_message)
              options[:header_message]
            else
              object_name = options[:object_name].to_s.gsub('_', ' ')
              object_name = I18n.t(object_name, :default => object_name, :scope => [:activerecord, :models], :count => 1)
              locale.t :header, :count => count, :model => object_name
            end
            message = options.include?(:message) ? options[:message] : locale.t(:body)
            error_messages = objects.sum {|object| object.errors.full_messages.map {|msg| content_tag(:li, ERB::Util.html_escape(msg)) } }.join

            contents = ''
            contents << content_tag(options[:header_tag] || :h2, header_message) unless header_message.blank?
            contents << content_tag(:p, message) unless message.blank?
            contents << content_tag(:ul, error_messages)

            content_tag(:div, contents, html)
          end
        else
          ''
        end
      end

      private
        def all_input_tags(record, record_name, options)
          input_block = options[:input_block] || default_input_block
          record.class.content_columns.collect{ |column| input_block.call(record_name, column) }.join("\n")
        end

        def default_input_block
          Proc.new { |record, column| %(<p><label for="#{record}_#{column.name}">#{column.human_name}</label><br />#{input(record, column.name)}</p>) }
        end
    end

    class InstanceTag #:nodoc:
      def to_tag(options = {})
        case column_type
          when :string
            field_type = @method_name.include?("password") ? "password" : "text"
            to_input_field_tag(field_type, options)
          when :text
            to_text_area_tag(options)
          when :integer, :float, :decimal
            to_input_field_tag("text", options)
          when :date
            to_date_select_tag(options)
          when :datetime, :timestamp
            to_datetime_select_tag(options)
          when :time
            to_time_select_tag(options)
          when :boolean
            to_boolean_select_tag(options)
        end
      end

      alias_method :tag_without_error_wrapping, :tag
      def tag(name, options)
        if object.respond_to?(:errors) && object.errors.respond_to?(:on)
          error_wrapping(tag_without_error_wrapping(name, options), object.errors.on(@method_name))
        else
          tag_without_error_wrapping(name, options)
        end
      end

      alias_method :content_tag_without_error_wrapping, :content_tag
      def content_tag(name, value, options)
        if object.respond_to?(:errors) && object.errors.respond_to?(:on)
          error_wrapping(content_tag_without_error_wrapping(name, value, options), object.errors.on(@method_name))
        else
          content_tag_without_error_wrapping(name, value, options)
        end
      end

      alias_method :to_date_select_tag_without_error_wrapping, :to_date_select_tag
      def to_date_select_tag(options = {}, html_options = {})
        if object.respond_to?(:errors) && object.errors.respond_to?(:on)
          error_wrapping(to_date_select_tag_without_error_wrapping(options, html_options), object.errors.on(@method_name))
        else
          to_date_select_tag_without_error_wrapping(options, html_options)
        end
      end

      alias_method :to_datetime_select_tag_without_error_wrapping, :to_datetime_select_tag
      def to_datetime_select_tag(options = {}, html_options = {})
        if object.respond_to?(:errors) && object.errors.respond_to?(:on)
            error_wrapping(to_datetime_select_tag_without_error_wrapping(options, html_options), object.errors.on(@method_name))
          else
            to_datetime_select_tag_without_error_wrapping(options, html_options)
        end
      end

      alias_method :to_time_select_tag_without_error_wrapping, :to_time_select_tag
      def to_time_select_tag(options = {}, html_options = {})
        if object.respond_to?(:errors) && object.errors.respond_to?(:on)
          error_wrapping(to_time_select_tag_without_error_wrapping(options, html_options), object.errors.on(@method_name))
        else
          to_time_select_tag_without_error_wrapping(options, html_options)
        end
      end

      def error_wrapping(html_tag, has_error)
        has_error ? Base.field_error_proc.call(html_tag, self) : html_tag
      end

      def error_message
        object.errors.on(@method_name)
      end

      def column_type
        object.send(:column_for_attribute, @method_name).type
      end
    end
  end
end