Leonel *-* wrote:
> I'm trying to display a drop-down menu by using an instance variable
> from a model.
[...]
> Now, I want to populate the values from the model like this
> @durations = {"30 minutes" => "30", "1 hour" => "60", "1 hour 30
> minutes" => "90", "2 hours" => "120"}
>
> Then in the form partial I have this
> <div class="field">
> <%= f.label :duration %><br />
> <%= f.select ("duration", @durations.map {|d| [d.id, d.name]}, :prompt
> => "Select") %>
Why not just use collection_select?
And why not use Haml?
> </div>
>
> I get this error:
> You have a nil object when you didn't expect it!
> You might have expected an instance of Array.
> The error occurred while evaluating nil.map
Of course you did! The view has no access to model instance variables.
If you want to use @durations in the view, you'll need to set it in the
*controller*, not the model. Rails copies controller instance variables
to the view.
>
> How can I initialize an instance variable or instance hash
No such thing as an "instance hash". Did you mean an instance variable
that happens to contain a Hash?
> and then use
> it on the form for the drop-down menu?
By setting it in the controller. If this is at all confusing, you may
want to review the Rails Guides or other basic reference.
Best,
--
Marnen Laibow-Koser
http://www.marnen.org
[email protected]
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