lib/bdfr_browser/http/plug.ex

@@ -44,7 +44,8 @@ defmodule BdfrBrowser.HTTP.Plug do
 
     tpl_args = [
       subreddit: subreddit,
-      dates: subreddit_record |> Post.date_listing() |> Repo.all()
+      dates: subreddit_record |> Post.date_listing() |> Repo.all(),
+      statistics: subreddit |> Subreddit.statistics() |> Repo.all()
     ]
 
     content = render_template("subreddit", tpl_args)
@@ -94,7 +95,8 @@ defmodule BdfrBrowser.HTTP.Plug do
 
     tpl_args = [
       subreddit: subreddit_names,
-      dates: subreddit_records |> Post.date_listing() |> Repo.all()
+      dates: subreddit_records |> Post.date_listing() |> Repo.all(),
+      statistics: subreddit_names |> Subreddit.statistics() |> Repo.all()
     ]
 
     content = render_template("subreddit", tpl_args)

lib/bdfr_browser/subreddit.ex

@@ -22,4 +22,16 @@ defmodule BdfrBrowser.Subreddit do
   def names_without(hidden) do
     from(s in __MODULE__, select: s.name, where: s.name not in ^hidden, order_by: [asc: fragment("lower(?)", s.name)])
   end
+
+  def statistics(subreddit) when is_binary(subreddit), do: statistics([subreddit])
+
+  def statistics(subreddits) when is_list(subreddits) do
+    from(s in __MODULE__,
+      join: p in assoc(s, :posts),
+      left_join: c in assoc(p, :comments),
+      select: {s.name, count(p.id), count(c.id)},
+      where: s.name in ^subreddits,
+      group_by: [s.name]
+    )
+  end
 end

priv/repo/migrations/20231024085825_add_indices_to_multiple_tables.exs

@@ -1,10 +0,0 @@
-defmodule BdfrBrowser.Repo.Migrations.AddIndicesToMultipleTables do
-  use Ecto.Migration
-
-  def change do
-    create index("posts", :author)
-    create index("posts", :posted_at)
-    create index("comments", :author)
-    create index("chats", :accounts)
-  end
-end

priv/templates/http/subreddit.eex

@@ -55,4 +55,12 @@
       <% end %>
     <% end %>
   </div>
+
+  <div class="d-grid gap-2 col-12 mx-auto">
+    <p class="text-secondary">
+      <%= for {name, post_count, comment_count} <- statistics do %>
+        <%= name %>: <%= post_count %> Posts; <%= comment_count %> Comments<br />
+      <% end %>
+    </p>
+  </div>
 </div>

priv/templates/http/subreddit_posts.eex

@@ -31,7 +31,7 @@
               <%= BdfrBrowser.RenderUtils.post_type_icon(post.url) %>
               <%= post.num_comments %> comment(s)
               -
-              <%= BdfrBrowser.RenderUtils.format_date(post.posted_at, :long) %></small>
+              <%= BdfrBrowser.RenderUtils.format_date(post.posted_at, :short) %></small>
           </h6>
         </div>
       </div>