Ruby on Rails: how do you specify an html ID with the form_tag

Question

I'm using the form tag, and I want the result to be nomething like this:

<form action="controller/action" id="myID">

I currently have this

<% form_tag :action => '', :id=>"relative_date_filter" do |f| %>

which generates this:

<form action="/controller/relative_date_filter" method="post">

EDIT:
I currently get this error:

compile error
/app/views/controller/filters/_relative_time.html.erb:1: syntax error, unexpected tASSOC, expecting '}'
...e=true ;  form_tag {:action => ''}, {:id => "relative_date_f...
                              ^
/app/views/controller/filters/_relative_time.html.erb:1: syntax error, unexpected ',', expecting kEND
...e ;  form_tag {:action => ''}, {:id => "relative_date_filter...
                              ^
/app/views/controller/filters/_relative_time.html.erb:1: syntax error, unexpected kDO, expecting kEND
... => "relative_date_filter"} do ; @output_buffer.concat "\n  ...
                              ^
/app/views/controller/filters/_relative_time.html.erb:14: syntax error, unexpected kENSURE, expecting $end
Extracted source (around line #1):

1: <% form_tag {:action => ''}, {:id => "relative_date_filter"} do %>

Here, what is weird is that there is no line 14. its the end of the file. I added a return, and it changed to line 15. My previous code did cause the syntax error.

Answer 1

This should work:

<% form_tag({:action => ''}, {:id => "relative_date_filter"}) do |f| %>

Answer 2

The first parameter of form_tag is the url which is why you're seeing 'relative_date_filter' used for that. I think the extra options may allow you to specify an id.

<% form_tag({:action => ''}, {:id => 'relative_date_filter'}) do |f| %>

The first hash being the url and the second any extra options. This is also where the form method is supplied if you want anything other than post, for example.

Answer 3

<%= form_tag ({:controller => 'public', :action => 'search'}), ({:class => "round_corners_8"}) do %>

This one is working for me in Rails 3.0