Add pubsub

lib/aggiedit/rooms.ex

@@ -9,96 +9,30 @@ defmodule Aggiedit.Rooms do
   alias Aggiedit.Accounts
   alias Aggiedit.Rooms.Room
 
-  @doc """
+  alias Phoenix.PubSub
-  Returns the list of rooms.
 
-  ## Examples
-
-      iex> list_rooms()
-      [%Room{}, ...]
-
-  """
   def list_rooms do
     Repo.all(Room)
   end
 
-  @doc """
-  Gets a single room.
-
-  Raises `Ecto.NoResultsError` if the Room does not exist.
-
-  ## Examples
-
-      iex> get_room!(123)
-      %Room{}
-
-      iex> get_room!(456)
-      ** (Ecto.NoResultsError)
-
-  """
   def get_room!(id), do: Repo.get!(Room, id)
 
-  @doc """
-  Creates a room.
-
-  ## Examples
-
-      iex> create_room(%{field: value})
-      {:ok, %Room{}}
-
-      iex> create_room(%{field: bad_value})
-      {:error, %Ecto.Changeset{}}
-
-  """
   def create_room(attrs \\ %{}) do
     %Room{}
     |> Room.changeset(attrs)
     |> Repo.insert()
   end
 
-  @doc """
-  Updates a room.
-
-  ## Examples
-
-      iex> update_room(room, %{field: new_value})
-      {:ok, %Room{}}
-
-      iex> update_room(room, %{field: bad_value})
-      {:error, %Ecto.Changeset{}}
-
-  """
   def update_room(%Room{} = room, attrs) do
     room
     |> Room.changeset(attrs)
     |> Repo.update()
   end
 
-  @doc """
-  Deletes a room.
-
-  ## Examples
-
-      iex> delete_room(room)
-      {:ok, %Room{}}
-
-      iex> delete_room(room)
-      {:error, %Ecto.Changeset{}}
-
-  """
   def delete_room(%Room{} = room) do
     Repo.delete(room)
   end
 
-  @doc """
-  Returns an `%Ecto.Changeset{}` for tracking room changes.
-
-  ## Examples
-
-      iex> change_room(room)
-      %Ecto.Changeset{data: %Room{}}
-
-  """
   def change_room(%Room{} = room, attrs \\ %{}) do
     Room.changeset(room, attrs)
   end
@@ -117,23 +51,9 @@ defmodule Aggiedit.Rooms do
   end
 
   def posts_in_room(room_id) do
-    Repo.all((from p in Post, where: p.room_id == ^room_id, select: p))
+    Repo.all((from p in Post, where: p.room_id == ^room_id, order_by: [asc: :id], select: p))
   end
 
-  @doc """
-  Gets a single post.
-
-  Raises `Ecto.NoResultsError` if the Post does not exist.
-
-  ## Examples
-
-      iex> get_post!(123)
-      %Post{}
-
-      iex> get_post!(456)
-      ** (Ecto.NoResultsError)
-
-  """
   def get_post!(id), do: Repo.get!(Post, id)
 
   def create_post(attrs, user, after_save \\ &{:ok, &1}) do
@@ -145,6 +65,7 @@ defmodule Aggiedit.Rooms do
     |> Ecto.Changeset.put_assoc(:user, user)
     |> Ecto.Changeset.put_assoc(:room, user.room)
     |> Repo.insert()
+    |> broadcast_post_over_room(:post_created)
     |> post_saved(after_save)
   end
 
@@ -152,6 +73,7 @@ defmodule Aggiedit.Rooms do
     post
     |> Post.changeset(attrs)
     |> Repo.update()
+    |> broadcast_post_over_room(:post_updated)
     |> post_saved(after_save)
   end
 
@@ -160,32 +82,22 @@ defmodule Aggiedit.Rooms do
   end
   defp post_saved(error, _fun), do: error
 
-  @doc """
-  Deletes a post.
-
-  ## Examples
-
-      iex> delete_post(post)
-      {:ok, %Post{}}
-
-      iex> delete_post(post)
-      {:error, %Ecto.Changeset{}}
-
-  """
   def delete_post(%Post{} = post) do
     Repo.delete(post)
+    |> broadcast_post_over_room(:post_deleted)
   end
 
-  @doc """
-  Returns an `%Ecto.Changeset{}` for tracking post changes.
-
-  ## Examples
-
-      iex> change_post(post)
-      %Ecto.Changeset{data: %Post{}}
-
-  """
   def change_post(%Post{} = post, attrs \\ %{}) do
     Post.changeset(post, attrs)
   end
+
+  defp broadcast_post_over_room({:error, _reason}=error, _event), do: error
+  defp broadcast_post_over_room({:ok, post}, event) do 
+    PubSub.broadcast(Aggiedit.PubSub, "room:#{post.room_id}:posts", {event, post})
+    {:ok, post}
+  end
+
+  def subscribe(room) do
+    PubSub.subscribe(Aggiedit.PubSub, "room:#{room.id}:posts")
+  end
 end

lib/aggiedit_web/live/post_live/index.ex

@@ -10,7 +10,9 @@ defmodule AggieditWeb.PostLive.Index do
   def mount(%{"room_id" => _room_id} = params, session, socket) do
     {:ok, socket} = assign_socket_room_and_user_or_error(params, session, socket)
     case socket.assigns do
-      %{:room => room} -> {:ok, assign(socket, %{:posts => room |> Repo.preload(posts: [:user, :upload]) |> Map.get(:posts)})}
+      %{:room => room} -> 
+        if connected?(socket), do: Rooms.subscribe(socket.assigns.room)
+        {:ok, assign(socket, %{:posts => room |> Repo.preload(posts: [:user, :upload]) |> Map.get(:posts)}), temporary_assigns: [posts: []]}
       _ -> {:ok, socket}
     end
   end
@@ -59,4 +61,11 @@ defmodule AggieditWeb.PostLive.Index do
       {:noreply, socket |> put_flash(:error, "You do not have permission to delete this post.") |> redirect(to: Routes.post_index_path(socket, :index, socket.assigns.room))}
     end
   end
+
+  @impl true
+  def handle_info({action, post}, socket) when action in [:post_created, :post_updated, :post_deleted] do
+    {:noreply, update(socket, :posts, fn posts -> 
+      [posts | post]
+    end)}
+  end
 end

lib/aggiedit_web/live/post_live/index.html.heex

@@ -15,8 +15,9 @@
 <% end %>
 
 <span><%= live_patch "New Post", to: Routes.post_index_path(@socket, :new, @room) %></span>
-<%= for post <- @posts do %>
+<div id="posts" phx-update="prepend">
-  <div class="card d-flex flex-row align-items-center p-2 m-2 shadow">
+  <%= for post <- @posts do %>
+    <div id={"post-#{post.id}"} class="card d-flex flex-row align-items-center p-2 m-2 shadow">
       <%= if !is_nil(post.upload) do %>
         <%= live_redirect to: Routes.post_show_path(@socket, :show, @room, post) do %>
           <div class="card-image d-flex justify-content-center" style="width: 100px">
@@ -37,17 +38,5 @@
         <% end %>
       </div>
     </div>
-<!--
+  <% end %>
-  <div class=>
+</div>
-  </div>
-  <tr id={"post-#{post.id}"}>
-    <td><%= post.title %></td>
-    <td><%= post.body %></td>
-
-    <td>
-      <span></span>
-    </td>
-  </tr>
-  -->
-<% end %>
-

lib/aggiedit_web/templates/layout/_user_menu.html.heex

@@ -1,6 +1,6 @@
 <%= if @current_user do %>
   <li class="nav-item active">
-    <%= link "Settings", to: Routes.user_settings_path(@conn, :edit), class: "nav-link" %>
+    <%= link "#{@current_user.username}/settings", to: Routes.user_settings_path(@conn, :edit), class: "nav-link" %>
   </li>
   <li class="nav-item active">
     <%= link "Log out", to: Routes.user_session_path(@conn, :delete), method: :delete, class: "nav-link" %>