Check out the documentation:
* in a view, "<%= url_for_file_column 'entry', 'image' %> will create
an URL to access the
uploaded file. Note that you need an Entry object in the instance
variable @entry for this
to work.
So the line in your index view:
<%= image_tag url_for_file_column("item", "picture",
"normal") %>
Is in-fact is trying to invoke:
@item.picture_relative_path
hence why you are getting evaluating nil error
Try this instead, pass the actual variable without quotes:
<%= image_tag url_for_file_column(item, "picture",
"normal") %>
Admittedly I probably wouldn't use file_column these days. Paperclip
is the defacto standard:
http://github.com/thoughtbot/paperclip/tree/master
Checkout the Ruby Tool Box which will give you sense of the defacto
plugins:
http://ruby-toolbox.com/
HTH,
Nicholas
On Jun 17, 5:21 pm, Per Fagrell <[email protected]> wrote:
> Hello!
>
> I'm trying to get image uploads to work with file_column, and thought
> I almost had it when I stumbled on a really strange error I can't
> figure out. No other post here seems to deal with it either.
>
> The create and edit views for my object "Item" (I'm a newbie at ruby/
> rails, so pardon my vocab ;) display the uploaded image just fine, but
> when I go back to the index, the page dies because it tried to invoke
> picture_relative_path on nil. No idea why the image string suddenly
> becomes nil, seems to me that it shouldn't be possible... attaching
> error and code around it. Any help GREATLY appreciated, just holler if
> any additional info would make it easier to diagnose. Hopefully the
> hive mind is sharper than my googling ;)
>
> --------Error output----------------
>
> Showing items/index.html.erb where line #14 raised:
>
> You have a nil object when you didn't expect it!
> The error occurred while evaluating nil.picture_relative_path
>
> Extracted source (around line #14):
>
> 11: <tr>
> 12: <td><%=h item.name %></td>
> 13: <td><%=h item.category %></td>
> 14: <td><%= image_tag url_for_file_column("item", "picture",
> "normal") %></td>
> 15: <td><%= link_to 'Show', item %></td>
> 16: <td><%= link_to 'Edit', edit_item_path(item) %></td>
> 17: <td><%= link_to 'Destroy', item, :confirm => 'Are you
> sure?', :method => :delete %></td>
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