Rails - Apr 2006 - habtm and options_from_collection_for_select [1.0.0]

I ran into a problem using options_from_collection_for_select :

ActiveRecord::AssociationTypeMismatch (Topic expected, got String):
     /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/ 
active_record/associations/association_collection.rb:128:in  
`raise_on_type_mismatch''
     /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/ 
active_record/associations/association_collection.rb:114:in `replace''
     /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/ 
active_record/associations/association_collection.rb:114:in `replace''
     /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/ 
active_record/associations.rb:770:in `topics=''

My models:

class Company < ActiveRecord::Base
   has_and_belongs_to_many :topics
end

class Topic < ActiveRecord::Base
   has_and_belongs_to_many :companies
end

And the form elements:

<select id="company_topics" name="company[topics][]"  
multiple="multiple">
   <%= options_from_collection_for_select(Topic.find_all, "id",  
"name") %>
</select>

I tested using the connsole, and things work as expected.

Any help greatly appreciated !

Paul

i don''t think this is an error related to
options_from_collection_for_select.

the key in the error is:

/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/active_record/associations.rb:770:in
`topics=''

it''s clearly an association error related to topics
if you look at the docs for habtm:

collection=objects - replaces the collections content by deleting and adding
objects as appropriate.

so my guess in one of you''re actions you trying to set the
company.topics to
a string rather than a Topic object.

a console test would confirm the same error

company = Company.find(:first)
test_params[:company][:topics] = ["1", "2", "3"]
company.topics=test_params[:company][:topics]



Chris

On 4/4/06, Paul Mylchreest <paul.mylchreest@mac.com>
wrote:
>
> I ran into a problem using options_from_collection_for_select :
>
> ActiveRecord::AssociationTypeMismatch (Topic expected, got String):
>      /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/
> active_record/associations/association_collection.rb:128:in
> `raise_on_type_mismatch''
>      /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/
> active_record/associations/association_collection.rb:114:in
`replace''
>      /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/
> active_record/associations/association_collection.rb:114:in
`replace''
>      /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/
> active_record/associations.rb:770:in `topics=''
>
> My models:
>
> class Company < ActiveRecord::Base
>    has_and_belongs_to_many :topics
> end
>
> class Topic < ActiveRecord::Base
>    has_and_belongs_to_many :companies
> end
>
> And the form elements:
>
> <select id="company_topics" name="company[topics][]"
> multiple="multiple">
>    <%= options_from_collection_for_select(Topic.find_all,
"id",
> "name") %>
> </select>
>
> I tested using the connsole, and things work as expected.
>
> Any help greatly appreciated !
>
> Paul
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
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