Rails - Jul 2006 - using collection_select

hello,

supposing i have a User class that contains a Wibble

class User < ActiveRecord::Base
  has_one :wibble
end

in my view i have
<%= collection_select :user, :wibble, Wibble.find(:all), :id, :name %>

when i post, i get an error like
"Wibble expected, got String"

how/where am I supposed to convert this posted wibble_id into a
Wibble, or am I using collection_select incorrectly?

i''ve seen some suggestions to use :wibble_id in the select, e.g.
<%= collection_select :user, :wibble_id, Wibble.find(:all), :id, :name %>

but if i do this i get an "undefined method wibble_id" error

thanks,
Jeff

Jeff Emminger wrote:
> hello,
> 
> supposing i have a User class that contains a Wibble
> 
> class User < ActiveRecord::Base
>   has_one :wibble
> end
> 
> in my view i have
> <%= collection_select :user, :wibble, Wibble.find(:all), :id, :name
%>
> 
> when i post, i get an error like
> "Wibble expected, got String"
> 
> how/where am I supposed to convert this posted wibble_id into a
> Wibble, or am I using collection_select incorrectly?
> 
> i''ve seen some suggestions to use :wibble_id in the select, e.g.
> <%= collection_select :user, :wibble_id, Wibble.find(:all), :id, :name 
> %>
> 
> but if i do this i get an "undefined method wibble_id" error
> 
> thanks,
> Jeff

You''re trying to get a select list for a form?  Here''s how I
do it:

This line grabs entries where users are tied to groups.  GroupUsers
belongs to Group, Groups have many GroupUsers.
<% @groups = GroupUser.find(:all, :conditions =>
"user_id=''"+session[:user_id].to_s+"''")
%>


Now take @groups array and for each entry in it, have it display the
name of the group, and then embed the group ID:
<%= select("group_users", "group_id", @groups.collect
{|p| [
p.group.name, p.group.id ] }, { :include_blank => true }) %>

It turns it into this html:
<select name="group_users[group_id]">
  <option></option>
  <option value="1">Group1</option>
  <option value="2">Group2</option>
  <option value="5">Group5</option>
</select>


Hope this helps!

-Ben Lisbakken


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ben,

thanks for the reply.  that''s pretty much what i''m doing...
specifically i''m trying to attach my own TimeZoneImpl class to the
User.
the User has_one :time_zone_impl

my select list ends up being semantically identical - time zone name
display with the id for each option value.  the problem is that when the
form is submitted, rails is trying to put the int id in the
user.time_zone_impl slot, when it needs to be an instance of
TimeZoneImpl instead.

perhaps i need to look into composed_of since the User is composed of a
TimeZoneImpl?

i think i''ve solved it... using :time_zone_impl_id in the 
collection_select call is correct.  my error was not having association 
field in the DB spelled correctly!  :-D

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hello gentlemen

 could u plz give me an example for collection_select rather than 
mentioning syntax for it. for example lets consider user have to select 
multiple values like elective subject say it has a subject a,b,c,d,e 
user can select any number of subject. gentlemen am awaiting for a reply 
&  have a nice day

Advance Thx
regards
narayana

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<%= select_tag options_from_collection_for_select(@people, "id",
"name")
%>

where
@people = Person.find(:all)  # or some other collection of variables

and where ''id'' and ''name'' are both in the
Person model (in the table of
people, there is for example:    id int auto_increment, name varchar255, 
[and more columns..] .. )

and this will output:

<select>
  <option value=((the id of the person 1))> the name of the person 
1</option>
  <option value=((the id of the person 2))> the name of the person 
2</option>
  <option value=((the id of the person 3))> the name of the person 
3</option>
  .
  .
  .
</select>

hope it helps,

s

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hello shai

  Thx for helping i know already how to accept multiple values in html 
format
i want to know how to do this with collection_select

advance thx
have a nice day

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