Rails Nested Forms With Images

Question

So I\'m building a nested form with an Campaigns model and a Sites model where Campaigns has_many Sites. In my Campaigns form I have:

<%= f.fields_for :sites          


        

Answer 1

From the form helper object (in your case builder and f) you should be able to access the model object and the url your looking for like this:

<%= image_tag f.object.image_url(:thumb) %>

The image in image_url depends on how you named the attribute, but for your sample this should be correct.

Answer 2

You may want to investigate the paperclip gem: https://github.com/thoughtbot/paperclip

It lets you do this to show a thumbnail of the existing picture.

<div class="field">
    <% if @thing.logo? %>
    <%= image_tag @thing.logo(:thumb) %><br/>
      Change
    <% end %>
    <%= f.label :logo %>
    <%= f.file_field :logo %>
  </div>