refactors communities sidebar query

Author: elixirprogrammer

lib/reddit/category.ex

@@ -21,6 +21,11 @@ defmodule Reddit.Category do
     Repo.all(Community)
   end
 
+  def list_communities_names do
+    query = from c in Community, select: c.name, order_by: [asc: c.name]
+    Repo.all(query)
+  end
+
   @doc """
   Gets a single community.
 

lib/reddit_web/controllers/page_controller.ex

@@ -14,7 +14,7 @@ defmodule RedditWeb.PageController do
 ###  end
 
   def index(conn, _params) do
-    communities = Category.list_communities()
+    communities = Category.list_communities_names()
     posts = Post.list_popular_posts()
     logged_in_user_id = logged_in(conn.assigns.current_user)
     render conn, :index, communities: communities, posts: posts, logged_in_user_id: logged_in_user_id

lib/reddit_web/templates/page/index.html.eex

@@ -42,7 +42,7 @@
       <ul class="list-group list-group-flush">
         <%= for community <- @communities do %>
           <li class="list-group-item">
-            <%= link community.name, to: Routes.community_path(@conn, :show, community.name) %>
+            <%= link community, to: Routes.community_path(@conn, :show, community) %>
           </li>
         <% end %>
       </ul>