Hey,
I recently started building my first Phoenix app, it’ll be a YT downloader.

Design
So, when I started implementing searching I realised that you can search for playlist, channels and videos.
I thought about two designs:

1. create universal thumbnail template and embed switching between types in view module.
2. create 3 separate thumbnails and use case to get type from received API response, rendering appropriate partial template

The problem
I went with 2nd solution, but after writing it Phoenix crashes. Here’s the code:

<%= for item <- @search_results["items"] do %>
  <% case kind(item["id"]) do %>
    <% :playlist -> render "playlist_thumbnail.html", data: extract_video_data(item), conn: @conn %>
    <% :video -> render "video_thumbnail.html", data: extract_video_data(item), conn: @conn %>
  <% end %>
<% end %>

def kind(%{"kind" => "youtube#playlist"}), do: :playlist
def kind(%{"kind" => "youtube#video"}), do: :video
def kind(_), do: :error

Error:

== Compilation error in file lib/yt_downloader_web/views/search_view.ex ==
** (SyntaxError) lib/yt_downloader_web/templates/search/search.html.eex:3: syntax error before: ‘->’
(eex) lib/eex/compiler.ex:45: EEx.Compiler.generate_buffer/4
(eex) lib/eex/compiler.ex:54: EEx.Compiler.generate_buffer/4
(phoenix) lib/phoenix/template.ex:378: Phoenix.Template.compile/2
(phoenix) lib/phoenix/template.ex:186: anonymous fn/3 in Phoenix.Template.“MACRO-before_compile”/2
(elixir) lib/enum.ex:1899: Enum.“-reduce/3-lists^foldl/2-0-”/3
(phoenix) expanding macro: Phoenix.Template.before_compile/1
lib/yt_downloader_web/views/search_view.ex:1: YtDownloaderWeb.SearchView (module)
(elixir) lib/kernel/parallel_compiler.ex:198: anonymous fn/4 in Kernel.ParallelCompiler.spawn_workers/6

Questions

1. Did I missed something in case?
2. Is there simpler or more Phoenixy way to do this?

EDIT:
I got it working by using:

<%= for item <- @search_results["items"] do %>
  <%= case kind(item["id"]) do %>
    <% :playlist -> %> <%= render "playlist_thumbnail.html", data: extract_video_data(item), conn: @conn %>
    <% :video -> %> <%= render "video_thumbnail.html", data: extract_video_data(item), conn: @conn %>
  <% end %>
<% end %>

But I still dunno why this is working and why earlier code wasn’t working. Anybody?