Rails - Jun 2007 - complete stumper: variable exists in hidden_field_tag, but nil everywhere else

This is a real mystery to me. I have an instance variable in a partial
that only gives its value inside a hidden_field_tag. If I try to use
the variable anywhere else in the partial, i either get nil or an
undefined error. The goal is to use the value of @event.id outside of
hidden_field_tag.

Here''s what works:
<%= hidden_field_tag ''id'', @event && @event.id, :id
=> ''event_id'' %>

...spits out this HTML: <input type="hidden" name="id"
id="event_id"
value="771"/>

So I read that to mean that @event.id is 771. Fine, good. However, if
I change the line to this:
<%= hidden_field_tag ''id'', @event.id, :id =>
''event_id'' %>

...I get an error:

RuntimeError in Controller#index

Showing app/views/controller/_contacts.rhtml where line #81 raised:

Called id for nil, which would mistakenly be 4 -- if you really wanted
the id of nil, use object_id


Furthermore, if I say this elsewhere in the same partial:
the event id is: <%= @event && @event.id %>END

...I get this:

the event is: END


And finally if I do this:

        <%= hidden_field_tag ''id'', @event &&
@event.id, :id =>
''event_id'' %>
        <%= hidden_field_tag ''id'', @event &&
@event.id, :id =>
''event_id'' %>
        <%= hidden_field_tag ''id'', @event &&
@event.id, :id =>
''event_id'' %>
        <%= hidden_field_tag ''id'', @event &&
@event.id, :id =>
''event_id'' %>
        <%= hidden_field_tag ''id'', @event &&
@event.id, :id =>
''event_id'' %>

...only the FIRST one works:

<input id="event_id" type="hidden" name="id"
value="771"/>
<input id="event_id" type="hidden"
name="id"/>
<input id="event_id" type="hidden"
name="id"/>
<input id="event_id" type="hidden"
name="id"/>
<input id="event_id" type="hidden"
name="id"/>



Anyone got a handle on this? I''ve never seen a problem like this
before and it''s driving me completely nuts. I''d really be
grateful for
any tips or fixes.

Thanks!
-Jason


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Hi Jason,

Jason Frankovitz wrote:
> This is a real mystery to me. I have an instance variable in a partial
> that only gives its value inside a hidden_field_tag. If I try to use
> the variable anywhere else in the partial, i either get nil or an
> undefined error. The goal is to use the value of @event.id outside of
> hidden_field_tag.
>
> Here''s what works:
> <%= hidden_field_tag ''id'', @event &&
@event.id, :id => ''event_id'' %>
>
> ...spits out this HTML: <input type="hidden"
name="id" id="event_id"
> value="771"/>
>
> So I read that to mean that @event.id is 771. Fine, good.
I don''t think it''s doing what you think it''s doing. 
This may help:
http://www.railsforum.com/viewtopic.php?pid=28781

Best regards,
Bill 



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