I''m trying to create my first custom FormBuilder and I''m
having a bit
of a problem. I''m trying to add a ''field_group''
method to my builder
that takes a block, but when I yield to the block I seem to be getting
duplicate form field entries being produced. Maybe my code will make
this clearer:
class LabelledBuilder < ActionView::Helpers::FormBuilder
def self.define_labelled_field_method(method_name)
src = <<-end_src
def #{method_name}(label, method, options = {})
hint_text = options[:hint]
@template.content_tag("tr") do
@template.content_tag("td",
@template.content_tag("label",
label.to_s.humanize.titleize, :for => method)) +
@template.content_tag("td", super(method, options) +
(hint_text.nil? ? '''' :
@template.content_tag("div",
hint_text, :class => "field_hint")))
end
end
end_src
class_eval src, __FILE__, __LINE__
end
def check_box(label, method, options = {})
super(method, options) +
@template.content_tag("label", label, :for => method)
end
def field_group(label, &proc)
raise ArgumentError, "Missing block" unless block_given?
@template.concat(yield, proc.binding) # <--- !!!! PROBLEM
SEEMS TO BE CAUSED BY THIS YIELD !!!
end
(field_helpers - %w(check_box)).each do |name|
define_labelled_field_method(name)
end
end
If I put this in my view
<% form_for :user, :url => {:controller => :user, :action
=> :new }, :builder => LabelledBuilder do |f| %>
<table>
<%= f.text_field "user name:", :user_name, :hint =>
"Enter user
name" %>
<% f.field_group "includes:" do %>
<%= f.check_box "box", :terms_of_service %>
<% end %>
</table>
<% end %>
the text field and the checkbox are emitted correctly, but then I also
get an inner <form> element embedded in the outer <form> element,
and
the two <input> fields are repeated. Something like this:
<form action="/user/new" method="post">
<table>
<tr><td><label for="user_name">User
Name:</label></td><td><input
hint="Enter user name" id="user_user_name"
name="user[user_name]"
size="30" type="text" /><div
class="field_hint">Enter user name</div></
td></tr>
<input id="user_terms_of_service"
name="user[terms_of_service]"
type="checkbox" value="1" /><input
name="user[terms_of_service]"
type="hidden" value="0" /><label
for="terms_of_service">box</label>
<form action="/user/new" method="post">
<table>
<tr><td><label for="user_name">User
Name:</label></td><td><input
hint="Enter user name" id="user_user_name"
name="user[user_name]"
size="30" type="text" /><div
class="field_hint">Enter user name</div></
td></tr>
<input id="user_terms_of_service"
name="user[terms_of_service]"
type="checkbox" value="1" /><input
name="user[terms_of_service]"
type="hidden" value="0" /><label
for="terms_of_service">box</label>
</table>
</form>
I believe it has something to do with the call to ''yield'' in
my
field_group method, but I''m not sure why this is happening. Can
anybody explain this to me?
TIA,
-- bb
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