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
|
require 'cgi'
require File.dirname(__FILE__) + '/form_helper'
module ActionView
class Base
@@field_error_proc = Proc.new{ |html_tag, instance| "<div class=\"fieldWithErrors\">#{html_tag}</div>" }
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 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. Example
# (title is a VARCHAR column and 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)
InstanceTag.new(record_name, method, self).to_tag
end
# Returns an entire form with input tags and everything for a specified Active Record object. Example
# (post is a new record that has a title using VARCHAR and a body using TEXT):
# form("post") =>
# <form action='/post/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" wrap="virtual">
# Back to the hill and over it again!
# </textarea>
# </p>
# <input 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. Example (entry is a new record that has a message attribute using VARCHAR):
#
# form("entry", :action => "sign", :input_block =>
# Proc.new { |record, column| "#{column.human_name}: #{input(record, column.name)}<br />" }) =>
#
# <form action='/post/sign' method='post'>
# Message:
# <input id="post_title" name="post[title]" size="30" type="text" value="Hello World" /><br />
# <input 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
def form(record_name, options = {})
record = instance_eval("@#{record_name}")
options[:action] ||= record.new_record? ? "create" : "update"
action = url_for(:action => options[:action])
submit_value = options[:submit_value] || options[:action].gsub(/[^\w]/, '').capitalize
id_field = record.new_record? ? "" : InstanceTag.new(record_name, "id", self).to_input_field_tag("hidden")
formtag = %(<form action="#{action}" method="post">#{id_field}) + all_input_tags(record, record_name, options)
yield formtag if block_given?
formtag + %(<input type="submit" value="#{submit_value}" /></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 DIV tag, which can be specialized to include both a +prepend_text+ and +append_text+
# to properly introduce the error and a +css_class+ to style it accordingly. Examples (post has an error message
# "can't be empty" on the title attribute):
#
# <%= error_message_on "post", "title" %> =>
# <div class="formError">can't be empty</div>
#
# <%= error_message_on "post", "title", "Title simply ", " (or it won't work)", "inputError" %> =>
# <div class="inputError">Title simply can't be empty (or it won't work)</div>
def error_message_on(object, method, prepend_text = "", append_text = "", css_class = "formError")
if errors = instance_eval("@#{object}").errors.on(method)
"<div class=\"#{css_class}\">#{prepend_text + (errors.is_a?(Array) ? errors.first : errors) + append_text}</div>"
end
end
# Returns a string with a div containing all the error messages for the object located as an instance variable by the name
# of <tt>object_name</tt>. This div 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)
def error_messages_for(object_name, options={})
object = instance_eval "@#{object_name}"
unless object.errors.empty?
content_tag("div",
content_tag(
options[:header_tag] || "h2",
"#{pluralize(object.errors.count, "error")} prohibited this #{object_name.gsub("_", " ")} from being saved"
) +
content_tag("p", "There were problems with the following fields:") +
content_tag("ul", object.errors.full_messages.collect { |msg| content_tag("li", msg) }),
"id" => options[:id] || "errorExplanation", "class" => options[:class] || "errorExplanation"
)
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
to_input_field_tag("text", options)
when :date
to_date_select_tag(options)
when :datetime
to_datetime_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 = {})
if object.respond_to?("errors") && object.errors.respond_to?("on")
error_wrapping(to_date_select_tag_without_error_wrapping(options), object.errors.on(@method_name))
else
to_date_select_tag_without_error_wrapping(options)
end
end
alias_method :to_datetime_select_tag_without_error_wrapping, :to_datetime_select_tag
def to_datetime_select_tag(options = {})
if object.respond_to?("errors") && object.errors.respond_to?("on")
error_wrapping(to_datetime_select_tag_without_error_wrapping(options), object.errors.on(@method_name))
else
to_datetime_select_tag_without_error_wrapping(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
|
