comments appear as they are added

lib/launch_cart/comments.ex

@@ -17,8 +17,9 @@ defmodule LaunchCart.Comments do
       [%Comment{}, ...]
 
   """
-  def list_comments do
-    Repo.all(Comment)
+  def list_comments(site_id) do
+    from(c in Comment, where: c.comment_site_id == ^site_id, order_by: {:desc, c.inserted_at})
+    |> Repo.all()
   end
 
   @doc """
@@ -53,6 +54,21 @@ defmodule LaunchCart.Comments do
     %Comment{}
     |> Comment.changeset(attrs)
     |> Repo.insert()
+    |> case do
+      {:ok, comment} ->
+        Phoenix.PubSub.broadcast(
+          LaunchCart.PubSub,
+          "comments:#{comment.comment_site_id}",
+          {:comment_created, comment}
+        )
+
+        # what do here?
+        # comment |> CommentEmail.comment_added() |> Mailer.deliver() |> IO.inspect()
+        {:ok, comment}
+
+      {:error, changeset} ->
+        {:error, changeset}
+    end
   end
 
   @doc """

test/launch_cart/comments_test.exs

@@ -12,7 +12,7 @@ defmodule LaunchCart.CommentsTest do
 
     test "list_comments/1 returns all comments for site" do
       comment = insert(:comment)
-      assert Comments.list_comments() |> Enum.map(& &1.id) == [comment.id]
+      assert Comments.list_comments(comment.comment_site_id) |> Enum.map(& &1.id) == [comment.id]
     end
 
     test "get_comment!/1 returns the comment with given id" do

test/launch_cart_web/features/launch_comments_test.exs

@@ -4,6 +4,7 @@ defmodule LaunchCartWeb.Features.LaunchCommentsTest do
 
   alias LaunchCart.Repo
   alias LaunchCart.CommentSites
+  alias LaunchCart.Comments
 
   import Wallaby.Query
   import LaunchCart.Factory
@@ -26,4 +27,22 @@ defmodule LaunchCartWeb.Features.LaunchCommentsTest do
     assert %{comments: [%{comment: "Has sumpin to say", author: "Bob"}]} =
              CommentSites.get_comment_site!(comment_site.id) |> Repo.preload(:comments)
   end
+
+  feature "sees new comments as they are created", %{session: session, comment_site: comment_site} do
+    session = session
+    |> visit("/fake_comment_site/#{comment_site.id}")
+
+    {:ok, _comment} =
+      Comments.create_comment(%{
+        comment_site_id: comment_site.id,
+        url: "http://foo.bar",
+        author: "Yo Mamma",
+        comment: "is so great that you are lucky to have her."
+      })
+
+    session
+    |> find(css("launch-comments"))
+    |> shadow_root()
+    |> assert_has(css("div[part='comment-text']", text: "is so great"))
+  end
 end