Rails - May 2006 - Make a checkbox checked based on a condition?

I have a series of checkboxes in a form generated as follows:

<% for user in @active_users %>
  <p><%= user.firstname + " " + user.surname%>
  <%= check_box ''assigned_tasks'',
''user_id'', {:index => user.id},
user.id, nil %></p>
<% end %>

I''d like to have one of them selected when user.id is equal to the
value
of the logged in user, stored in session[:user_id]

How do I do that?

thx
N.

-- 
Posted via http://www.ruby-forum.com/.

It''s a little obscure but you can find some general suggestions here:
http://api.rubyonrails.com/classes/ActionView/Helpers/FormHelper.html#M000394

I remember having a hell of a time doing the same thing but I don''t
remember my solution.

On 5/1/06, Nick Coyne <nic@nickcoyne.com> wrote:
> I have a series of checkboxes in a form generated as follows:
>
> <% for user in @active_users %>
>   <p><%= user.firstname + " " + user.surname%>
>   <%= check_box ''assigned_tasks'',
''user_id'', {:index => user.id},
> user.id, nil %></p>
> <% end %>
>
> I''d like to have one of them selected when user.id is equal to the
value
> of the logged in user, stored in session[:user_id]
>
> How do I do that?
>
> thx
> N.
>
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>

I''ve just had to do something similar and did this (though I have to 
say, I''m not wild about it - seems a pretty messy way to do it):

<% for c in @categories %>
  <%= check_box("category", c.id, (@selected_categories.include?(c)
?
{:checked => ''checked''} : {:checked => false} )) %>
<%= c.name %>
<% end %>

Basically, this was to allow an edit of an entry which was a member of a 
number of categories, with @selected_categories being the categories the 
entry is currently a member of. the bit in parentheses tests whether the 
category is included in @selected_categories, if so it returns :checked 
=> ''checked'', otherwise {:checked => false}

However, this feels a bit like a hack to me, and there''s got to be a 
better way. Hope this helps in the meantime.

Chuck Vose wrote:
> It''s a little obscure but you can find some general suggestions
here:
>
http://api.rubyonrails.com/classes/ActionView/Helpers/FormHelper.html#M000394
>
>
> I remember having a hell of a time doing the same thing but I
don''t
> remember my solution.
>
> On 5/1/06, Nick Coyne <nic@nickcoyne.com> wrote:
>> I have a series of checkboxes in a form generated as follows:
>>
>> <% for user in @active_users %>
>>   <p><%= user.firstname + " " + user.surname%>
>>   <%= check_box ''assigned_tasks'',
''user_id'', {:index => user.id},
>> user.id, nil %></p>
>> <% end %>
>>
>> I''d like to have one of them selected when user.id is equal to
the value
>> of the logged in user, stored in session[:user_id]
>>
>> How do I do that?
>>
>> thx
>> N.
>>
>> -- 
>> Posted via http://www.ruby-forum.com/.
>> _______________________________________________
>> Rails mailing list
>> Rails@lists.rubyonrails.org
>> http://lists.rubyonrails.org/mailman/listinfo/rails
>>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>

This worked for me with one minor change. The checkbox is unchecked by
default so the option parameter condition can be written more simply as:

(@selected_categories.include?(c) && {:checked =>
''checked''})


Chris T wrote:
> I''ve just had to do something similar and did this (though I have
to
> say, I''m not wild about it - seems a pretty messy way to do it):
> 
-- 
Posted via http://www.ruby-forum.com/.