Rails - Apr 2006 - "Cannot convert String to Integer" after using association

So, I''ve written a partial that does some stuff with a given instance
of
my class "entity". Entity is ActiveRecord. I''m able to
retrieve all
sorts of data from an @entity, until I do something like:

<% for @attribute in @entity.attributes %>
    <div id="attribute_<%= @attribute.id %>">
    	<%= render(:partial => ''attribute'') %>
    </div>
<% end %>

After which point, any attempt on my part to retrieve data from @entity 
( for instance <%= @entity.id %> results in:

cannot convert String into Integer

The stack trace is:

c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/active_record/associations/association_proxy.rb:75:in
`[]''
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/active_record/associations/association_proxy.rb:75:in
`send''
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/active_record/associations/association_proxy.rb:75:in
`method_missing''
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/active_record/associations/has_many_association.rb:90:in
`method_missing''
(eval):1:in `id''
#{RAILS_ROOT}/app/views/main/_entity.rhtml:27
#{RAILS_ROOT}/app/views/main/index.rhtml:30
#{RAILS_ROOT}/app/views/main/index.rhtml:29:in `each''
#{RAILS_ROOT}/app/views/main/index.rhtml:29


This is really starting to tick me off. I had a workaround in which I 
retrieved all the important information before I used an association, 
but that won''t let me retrieve more than one type of associated 
information.

Help?

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

Brian,

Can you include the actual code for _entity.rhtml, given that''s where  
your error is happening?

Cheers,

Pete Yandell
http://9cays.com

On 17/04/2006, at 9:37 AM, Bryan Duxbury wrote:
> So, I''ve written a partial that does some stuff with a given  
> instance of
> my class "entity". Entity is ActiveRecord. I''m able to
retrieve all
> sorts of data from an @entity, until I do something like:
>
> <% for @attribute in @entity.attributes %>
>     <div id="attribute_<%= @attribute.id %>">
>     	<%= render(:partial => ''attribute'') %>
>     </div>
> <% end %>
>
> After which point, any attempt on my part to retrieve data from  
> @entity
> ( for instance <%= @entity.id %> results in:
>
> cannot convert String into Integer
>
> The stack trace is:
>
> c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/ 
> active_record/associations/association_proxy.rb:75:in
> `[]''
> c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/ 
> active_record/associations/association_proxy.rb:75:in
> `send''
> c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/ 
> active_record/associations/association_proxy.rb:75:in
> `method_missing''
> c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/ 
> active_record/associations/has_many_association.rb:90:in
> `method_missing''
> (eval):1:in `id''
> #{RAILS_ROOT}/app/views/main/_entity.rhtml:27
> #{RAILS_ROOT}/app/views/main/index.rhtml:30
> #{RAILS_ROOT}/app/views/main/index.rhtml:29:in `each''
> #{RAILS_ROOT}/app/views/main/index.rhtml:29
>
>
> This is really starting to tick me off. I had a workaround in which I
> retrieved all the important information before I used an association,
> but that won''t let me retrieve more than one type of associated
> information.
>
> Help?
>
> -- 
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails

<%= @entity.id.to_s %>

On 4/16/06, Pete Yandell <pete@notahat.com> wrote:
>
> Brian,
>
> Can you include the actual code for _entity.rhtml, given that''s
where
> your error is happening?
>
> Cheers,
>
> Pete Yandell
> http://9cays.com
>
> On 17/04/2006, at 9:37 AM, Bryan Duxbury wrote:
>
> > So, I''ve written a partial that does some stuff with a given
> > instance of
> > my class "entity". Entity is ActiveRecord. I''m able
to retrieve all
> > sorts of data from an @entity, until I do something like:
> >
> > <% for @attribute in @entity.attributes %>
> >     <div id="attribute_<%= @attribute.id %>">
> >       <%= render(:partial => ''attribute'')
%>
> >     </div>
> > <% end %>
> >
> > After which point, any attempt on my part to retrieve data from
> > @entity
> > ( for instance <%= @entity.id %> results in:
> >
> > cannot convert String into Integer
> >
> > The stack trace is:
> >
> > c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/
> > active_record/associations/association_proxy.rb:75:in
> > `[]''
> > c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/
> > active_record/associations/association_proxy.rb:75:in
> > `send''
> > c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/
> > active_record/associations/association_proxy.rb:75:in
> > `method_missing''
> > c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/
> > active_record/associations/has_many_association.rb:90:in
> > `method_missing''
> > (eval):1:in `id''
> > #{RAILS_ROOT}/app/views/main/_entity.rhtml:27
> > #{RAILS_ROOT}/app/views/main/index.rhtml:30
> > #{RAILS_ROOT}/app/views/main/index.rhtml:29:in `each''
> > #{RAILS_ROOT}/app/views/main/index.rhtml:29
> >
> >
> > This is really starting to tick me off. I had a workaround in which I
> > retrieved all the important information before I used an association,
> > but that won''t let me retrieve more than one type of
associated
> > information.
> >
> > Help?
> >
> > --
> > 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
>


--
Mark Van Holstyn
mvette13@gmail.com
http://lotswholetime.com
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Mark Van Holstyn wrote:
> <%= @entity.id.to_s %>
Believe me, I tried that. Besides, you can''t even print out the id or 
any text, no matter the format.

Below is the code of _entity.rthml. The line that starts to loop for 
attributes will always fail. I hope someone finds something I missed.

<div id="entity_<%= @entity.id %>"
	class="table_div"
  style="width: 100px;  height: 50px"
  table="<%= @entity.name %>"
  onClick="tableClick(''entity_<%= @entity.id
%>'');"
>
	<div class="drag_handle"
    onMouseDown="makeDraggable(''entity_<%= @entity.id
%>'');"
    onMouseUp="makeUnDraggable();"
  >
  	<%= @entity.name %>
  </div>

<script language="JavaScript" type="text/javascript">
<!--
	var temp = new Array();
  temp.push(''<%= @entity.name %>'');
  temp.push(''entity_<%= @entity.id %>'');
  temp.push(new Array());
	tables.push(temp);
//-->
</script>
	<div style="font-style: italic;  border-top: 1px gray solid; 
border-bottom: 1px gray solid">
  	Attributes
  </div>
  <div id="entity_<%= @entity.id %>_attributes">
  	<% for @attribute in @entity.attributes %>
    <div id="attribute_<%= @attribute.id %>">
    	<%= render(:partial => ''attribute'') %>
    </div>
    <% end %>
  </div>
  <div style="font-style: italic; border-top: 1px gray solid; 
border-bottom: 1px gray solid">
  	Relations
  </div>
  <div id="entity__relations">
  <% for @relation in @entity.relations %>
    	<%= @relation.id %>
    <% end %>
  </div>
</div>



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

I''m betting something is broken in your attributes association. Can  
you post your entity and attribute models, and the schemas for their  
respective tables?

On 17/04/2006, at 1:25 PM, Bryan Duxbury wrote:
> <div id="entity_<%= @entity.id %>"
> 	class="table_div"
>   style="width: 100px;  height: 50px"
>   table="<%= @entity.name %>"
>   onClick="tableClick(''entity_<%= @entity.id
%>'');"
>>
> 	<div class="drag_handle"
>     onMouseDown="makeDraggable(''entity_<%= @entity.id
%>'');"
>     onMouseUp="makeUnDraggable();"
>>
>   	<%= @entity.name %>
>   </div>
>
> <script language="JavaScript"
type="text/javascript">
> <!--
> 	var temp = new Array();
>   temp.push(''<%= @entity.name %>'');
>   temp.push(''entity_<%= @entity.id %>'');
>   temp.push(new Array());
> 	tables.push(temp);
> //-->
> </script>
> 	<div style="font-style: italic;  border-top: 1px gray solid;
> border-bottom: 1px gray solid">
>   	Attributes
>   </div>
>   <div id="entity_<%= @entity.id %>_attributes">
>   	<% for @attribute in @entity.attributes %>
>     <div id="attribute_<%= @attribute.id %>">
>     	<%= render(:partial => ''attribute'') %>
>     </div>
>     <% end %>
>   </div>
>   <div style="font-style: italic; border-top: 1px gray solid;
> border-bottom: 1px gray solid">
>   	Relations
>   </div>
>   <div id="entity__relations">
>   <% for @relation in @entity.relations %>
>     	<%= @relation.id %>
>     <% end %>
>   </div>
> </div>

Mark Van Holstyn wrote:
> <%= @entity.id.to_s %>
You could replace this line with `<%= @entity.class.name %>` and tell 
us, what you get. #id is a method that returns the internal ruby id of 
an object represented by an integer.

Maybe @entity is not an ActiveRecord...


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

Pete Yandell wrote:
> I''m betting something is broken in your attributes association.
Can
> you post your entity and attribute models, and the schemas for their
> respective tables?
class Attribute < ActiveRecord::Base
	belongs_to :entity
end

class Entity < ActiveRecord::Base
	has_many :attributes
  has_many :relations,
  	:class_name => "Relation",
    :foreign_key => "entity1_id"

  has_many :incoming_relations,
  	:class_name => "Relation",
    :foreign_key => "entity2_id"
end

The schema is mundane. There''s a table for each model, with ids and 
other fields. The data types of all those things are correct. I checked 
to make sure the key field of Entity was an integer, and it is.

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

Bryan Duxbury wrote:
> Pete Yandell wrote:
>> I''m betting something is broken in your attributes
association. Can
>> you post your entity and attribute models, and the schemas for their
>> respective tables?
> 
> class Attribute < ActiveRecord::Base
> 	belongs_to :entity
> end
> 
> class Entity < ActiveRecord::Base
> 	has_many :attributes
>   has_many :relations,
>   	:class_name => "Relation",
>     :foreign_key => "entity1_id"
> 
>   has_many :incoming_relations,
>   	:class_name => "Relation",
>     :foreign_key => "entity2_id"
> end
> 
> The schema is mundane. There''s a table for each model, with ids
and
> other fields. The data types of all those things are correct. I checked 
> to make sure the key field of Entity was an integer, and it is.
> 
Bryan, you have chosen a name that clashes with Rails naming.

An ActiveRecord instance uses an ''attributes'' hash to hold the
state of
its attributes, and this has public accessors (attributes, attributes=).

regards

   Justin

Justin Forder wrote:
> Bryan Duxbury wrote:
>> 	has_many :attributes
>> other fields. The data types of all those things are correct. I checked
>> to make sure the key field of Entity was an integer, and it is.
>> 
> 
> Bryan, you have chosen a name that clashes with Rails naming.
> 
> An ActiveRecord instance uses an ''attributes'' hash to
hold the state of
> its attributes, and this has public accessors (attributes, attributes=).
> 
> regards
> 
>    Justin
Hot damn. That would make sense, wouldn''t it. Guess I''ll have
to rename.
Thanks.

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