Resolving-the-url-to-a-results-file-of-a-simulation.md

+1\. On the workflow model add `staged_dir_relative_path`:
+
+```diff
+# Get path to staged simulation directory relative to dataroot
+# i.e. given staged_dir of
+#
+#     /path/to/dataroot/containers/12
+#
+# this method returns
+#
+#     containers/12
+#
+# WARNING: Assumes staged_dir is inside dataroot!
+#
+# @return [Pathname] path to staged_dir relative to dataroot
+def staged_dir_relative_path
+-  Pathname.new(staged_dir).relative_path_from(AwesimRails.dataroot)
++  Pathname.new(staging_target_dir_name).join(Pathname.new(staged_dir).basename)
+end
+```
+
+2\. `files_path` is a helper provided to build URLs to files under the dataroot of the user. See https://github.com/AweSim-OSC/awesim_rails#filesrackapp for details. Add a model specific helper to build a URL, prepending the `files_path` URL. An example from ContainerFillSim:
+
+```ruby
+module ContainersHelper
+  # URL path helper
+  def container_results_path(container, path)
+    Pathname.new(files_path).join(container.staged_dir_relative_path, path).to_s
+  end
+end
+```
+
+3\. Use the helper in your views. In this example we iterate over each step of the container and display the corresponding image for each:
+
+```erb
+<% (0..@container.steps).each do |i| %>
+<div class="item <%= 'active' if i == 0 %>">
+  <%= image_tag container_results_path(@container, "images/t#{sprintf '%02d', i}.png") %>
+</div>
+<% end %>
+```
+
+