undefined method 'to_model' when linking thumbnail to original image - ruby-on-rails

Question

I'm creating an album that I'm planning to display with Masonry and ImgZoom so that the visitors can have a bigger image when they click on it.
According to ImgZoom, to make the zoom work, you need to do the following:
<a href="path/to/real/image.png">
<img src="path/to/image's/thumbnail.png class="thumbnail" />
</a>
So I generated an uploader, with the following inside it:
class ImageUploader < CarrierWave::Uploader::Base
include CarrierWave::MiniMagick
storage :file
def store_dir
'portfolio/photos'
end
version :thumb do
process :resize_to_fit => [220, nil]
end
end
Everything works perfectly, I can call both the versions without trouble, but when I try to follow ImgZoom's instructions by doing the following:
<%= #portfolio.photos.each do |p| %>
#This is a nested form inside the portfolio form, so I need to do this to get my images
<%= link_to image_tag p.image.thumb.url, p.image %>
or:
<%= link_to p.image do %>
<%= image_tag p.image.thumb.url, :class => 'thumbnail' %>
<% end %>
I'm getting the following error: undefined method 'to_model' for #<ImageUploader:0x0000000c35f4d8>
I found a similar subject on stack overflow but the asker wasn't clear and was invited to ask an other question on the forum, which I couldn't find.
I can individually reach 'p.image' and 'p.image.thumb.url', but I can't make a link from one to another, which would be perfectly doable with simple html.
What am I doing wrong?
Thank you in advance

Answer 1

First, to create the class "thumbnail" in the link, you need to declare it properly. I edited the link:
<%= link_to p.image.url do %>
<%= image_tag p.image.url, class: "thumbnail" %>
<% end %>
Second, you need to check if you created an appropriate route for viewing the image. This can be either done by linking to a static assets properly (as your image is not under "public") or via a template view.
If the files where stored under "public", your way of linking should work just fine.
Check out how image_path works in the docs: image_path (and more)