This Entangled Bank: Tag rails

editing ActiveRecord collection with related drop-downs using related_select_forms

Ed — Tue, 11 Sep 2007 10:13:00 +0100

Another problem setting the HTML name attribute when editing a collection of ActiveRecord objects in a Rails application. This time I was using the related_select_forms plugin to build related drop-down (select) lists. The plugin which creates all the necessary javascript to dynamically reload the second list according to the selection in the first list is kindly provided by Dimitrij Denissenko and available here.

After a bit of research I found that the name argument can be arbitrarily defined in the html_options hash passed as the final argument to the select list helper (see the docs here).

First I had to build up the name strings for the html in the format:

product[1424][field_name]

theme_name = "product[" + @product.id.to_s + "][theme_id]" 
sub_theme_name = "product[" + @product.id.to_s + "][sub_theme_id]"

first select list

<%= select(:theme, :id, theme_list, {},
            { :name => theme_name } ) %>

second select list

                    
<%= related_collection_select(
       :sub_theme, :id, [:theme, :id],  SubTheme.live_list, 
       :id, :name, :theme_id, 
       {}, 
       { :name => sub_theme_name } ) %>

NB: there is a slight gotcha here with the hashes. The first (empty) hash is the options{} hash used only for {:include_blank => true}, the second hash is used to set whatever HTML attributes you need, eg: { :selected => @product.sub_theme_id, :multiple => true, :name => sub_name }. You must include the first hash, empty if you don’t want to use :include_blank => true.

use multiple instances of FCK Editor when editing a Rails collection

Ed — Wed, 09 May 2007 00:38:00 +0100

Scott Rutherford has kindly packaged up a Rails helper for the FCK Editor as a plugin. You can find it here.

I was stumped for a while as I wanted to use multiple instances of the editor in a form used to edit a collection of objects, but figured it out with a little help from Scott.

I was using the syntax:

<%= text_field("product[]", "name", :size => 60) %>

successfully on other fields but trying:

<%= fckeditor_textarea("product[]", 'description', ... %>

gave me the error:

(eval):1:in `[]': wrong number of arguments (0 for 1)

In order to get HTML in the correct form:

<textarea id='product_3893_description_editor' 
 name='product[3893][description]'>blank</textarea>

it was necessary to pass the product ID to Scott’s helper as an additional argument:

<%= fckeditor_textarea_multi( "product",  "description", 
@product.id, { ...}) %>

and tweak the helper in fckeditor.rb:

def fckeditor_textarea_multi(object, field, new_arg, options = {})
   ... [snip] ...  
   inputs = "<textarea id='#{id}' #{cols} #{rows}  
   name='#{object}[#{new_arg}][#{field}]'>
   #{value}</textarea>\n"
   ... [snip] ...

multiple cygwin terminals without running X

Ed — Thu, 01 Mar 2007 00:08:00 +0000

I found Poderosa to be a good solution for running multiple Cygwin terminals within a tabbed window whilst doing Rails development.

As Poderosa is a Windows app it was easier to set up than the various X Window solutions suggested, such as MRXVT.

You can split the screen if you like which I do when I need to keep an eye on both my development and test log files.

Webrick on XP: starts OK then hangs on first request?

Ed — Tue, 30 Jan 2007 00:09:00 +0000

I had this problem and found the solution:

netsh winsock reset

here: http://www.db75.com/new_blog/?p=249

If anyone knows how to get XP to un-confuse itself without requiring a reboot, then it would be good to know.