LiveView Post Show

blog.ex

# lib/morphic_pro/blog.ex

defmodule MorphicPro.Blog do
 ...

  def get_post!(slug, current_user, options \\ []) do
    preload = Keyword.get(options, :preload, [])

    Post
    |> Repo.by_slug(slug)
    |> from(preload: ^preload)
    |> Bodyguard.scope(current_user)
    |> Repo.one!()
  end
  
  ...
end

console.sh

The logs from my console.

[info] GET /posts/foobar
[debug] Processing with Phoenix.LiveView.Plug.show/2
  Parameters: %{"slug" => "foobar"}
  Pipelines: [:browser]

[
  "mount",
  %{"slug" => "foobar"},
  %{
    "_csrf_token" => "...",
    "user_token" => ...
  },
  #Phoenix.LiveView.Socket<
    assigns: %{
      flash: %{},
      live_action: :show,
      live_module: MorphicProWeb.PostLive.Show
    },
    changed: %{},
    endpoint: MorphicProWeb.Endpoint,
    id: "phx-Fgvs1dGJIPBNOgEC",
    parent_pid: nil,
    root_pid: nil,
    router: MorphicProWeb.Router,
    view: MorphicProWeb.PostLive.Show,
    ...
  >
]

[debug] QUERY OK source="users_tokens" db=23.2ms idle=3075.7ms
SELECT u1."id", u1."email", u1."hashed_password", u1."confirmed_at", u1."admin", u1."inserted_at", u1."updated_at" FROM "users_tokens" AS u0 INNER JOIN "users" AS u1 ON u1."id" = u0."user_id" WHERE ((u0."token" = $1) AND (u0."context" = $2)) AND (u0."inserted_at" > $3::timestamp + (-60::decimal::numeric * interval '1 day')) [..., "session", ~U[2020-05-04 20:21:36.666142Z]]
[
  "handle_params",
  %{"slug" => "foobar"},
  "https://localhost:4001/posts/foobar",
  #Phoenix.LiveView.Socket<
    assigns: %{
      current_user: #MorphicPro.Accounts.User<
        __meta__: #Ecto.Schema.Metadata<:loaded, "users">,
        admin: true,
        captcha: nil,
        captcha_return: nil,
        confirmed_at: ~N[2020-04-22 20:51:33],
        email: "jchernoff@morphic.pro",
        ...
      >,
      flash: %{},
      live_action: :show,
      live_module: MorphicProWeb.PostLive.Show
    },
    changed: %{current_user: true},
    endpoint: MorphicProWeb.Endpoint,
    id: "phx-Fgvs1dGJIPBNOgEC",
    parent_pid: nil,
    root_pid: nil,
    router: MorphicProWeb.Router,
    view: MorphicProWeb.PostLive.Show,
    ...
  >
]
[debug] QUERY OK source="posts" db=5.9ms idle=2959.3ms
SELECT p0."id", p0."body", p0."draft", p0."excerpt", p0."published_at", p0."published_at_local", p0."slug", p0."title", p0."large_img", p0."thumb_img", p0."likes_count", p0."tags_string", p0."inserted_at", p0."updated_at" FROM "posts" AS p0 WHERE (p0."slug" = $1) ["foobar"]
[debug] QUERY OK source="tags" db=12.0ms idle=2928.6ms
SELECT t0."id", t0."name", p1."id" FROM "tags" AS t0 INNER JOIN "posts" AS p1 ON p1."id" = ANY($1) INNER JOIN "post_tags" AS p2 ON p2."post_id" = p1."id" WHERE (p2."tag_id" = t0."id") ORDER BY p1."id" [[12]]
[info] Sent 200 in 46ms
[info] CONNECTED TO Phoenix.LiveView.Socket in 227µs
  Transport: :websocket
  Serializer: Phoenix.Socket.V2.JSONSerializer
  Parameters: %{"_csrf_token" => "...", "vsn" => "2.0.0"}
[
  "mount",
  %{"slug" => "foobar"},
  %{
    "_csrf_token" => "...",
    "user_token" => ...
  },
  #Phoenix.LiveView.Socket<
    assigns: %{
      flash: %{},
      live_action: :show,
      live_module: MorphicProWeb.PostLive.Show
    },
    changed: %{},
    endpoint: MorphicProWeb.Endpoint,
    id: "phx-Fgvs1dGJIPBNOgEC",
    parent_pid: nil,
    root_pid: #PID<0.683.0>,
    router: MorphicProWeb.Router,
    view: MorphicProWeb.PostLive.Show,
    ...
  >
]
[debug] QUERY OK source="users_tokens" db=7.2ms idle=3347.1ms
SELECT u1."id", u1."email", u1."hashed_password", u1."confirmed_at", u1."admin", u1."inserted_at", u1."updated_at" FROM "users_tokens" AS u0 INNER JOIN "users" AS u1 ON u1."id" = u0."user_id" WHERE ((u0."token" = $1) AND (u0."context" = $2)) AND (u0."inserted_at" > $3::timestamp + (-60::decimal::numeric * interval '1 day')) [..., "session", ~U[2020-05-04 20:21:37.128194Z]]
[
  "handle_params",
  %{"slug" => "foobar"},
  "https://localhost:4001/posts/foobar",
  #Phoenix.LiveView.Socket<
    assigns: %{
      current_user: #MorphicPro.Accounts.User<
        __meta__: #Ecto.Schema.Metadata<:loaded, "users">,
        admin: true,
        captcha: nil,
        captcha_return: nil,
        confirmed_at: ~N[2020-04-22 20:51:33],
        email: "jchernoff@morphic.pro",
        ...
      >,
      flash: %{},
      live_action: :show,
      live_module: MorphicProWeb.PostLive.Show
    },
    changed: %{current_user: true},
    endpoint: MorphicProWeb.Endpoint,
    id: "phx-Fgvs1dGJIPBNOgEC",
    parent_pid: nil,
    root_pid: #PID<0.683.0>,
    router: MorphicProWeb.Router,
    view: MorphicProWeb.PostLive.Show,
    ...
  >
]
[debug] QUERY OK source="posts" db=11.5ms idle=2211.0ms
SELECT p0."id", p0."body", p0."draft", p0."excerpt", p0."published_at", p0."published_at_local", p0."slug", p0."title", p0."large_img", p0."thumb_img", p0."likes_count", p0."tags_string", p0."inserted_at", p0."updated_at" FROM "posts" AS p0 WHERE (p0."slug" = $1) ["foobar"]
[debug] QUERY OK source="tags" db=30.8ms queue=0.1ms idle=2214.7ms
SELECT t0."id", t0."name", p1."id" FROM "tags" AS t0 INNER JOIN "posts" AS p1 ON p1."id" = ANY($1) INNER JOIN "post_tags" AS p2 ON p2."post_id" = p1."id" WHERE (p2."tag_id" = t0."id") ORDER BY p1."id" [[12]]

post.ex

# lib/morphic_pro/blog/post.ex

defmodule MorphicPro.Blog.Post do
  ...

  @behaviour Bodyguard.Schema

  def scope(query, %MorphicPro.Accounts.User{admin: true}, _), do: query 
  def scope(query, _, _), do: MorphicPro.Repo.where_published(query)

  ...
end

router.ex

# lib/morphic_pro_web/router.ex

defmodule MorphicProWeb.Router do
  use MorphicProWeb, :router
  ...
  
  pipeline :browser do
    plug :accepts, ["html"]
    plug :fetch_session
    plug :fetch_live_flash
    plug :put_root_layout, {MorphicProWeb.LayoutView, :root}
    plug :protect_from_forgery
    plug :put_secure_browser_headers
  end
  
  ...
  
  scope "/", MorphicProWeb do
    pipe_through :browser

    live "/posts/:slug", PostLive.Show, :show
  end

end

show.ex

# lib/morphic_pro_web/live/post_live/show.ex

defmodule MorphicProWeb.PostLive.Show do
  use MorphicProWeb, :live_view

  alias MorphicPro.Blog
  alias MorphicPro.Blog.Post
  alias MorphicPro.Accounts

  @impl true
  def mount(%{"slug" => slug} = params, session, socket) do
    IO.inspect(["mount", params, session, socket])
    if connected?(socket),
      do: Phoenix.PubSub.subscribe(MorphicPro.PubSub, "post:#{slug}")

    if user = session["user_token"] && Accounts.get_user_by_session_token(session["user_token"]) do
      {:ok, assign(socket, current_user: user)}
    else
      {:ok, assign(socket, current_user: nil)}
    end
  end

  @impl true
  def handle_params(%{"slug" => slug} = params, session, %{assigns: %{current_user: current_user}} = socket) do
    IO.inspect(["handle_params", params, session, socket])

      # How do I render a 404 with LV?
      # is the (Ecto.NoResultsError) expected at least one result but got none in query: handled?
      {:noreply,
        socket
        |> assign(:page_title, page_title(socket.assigns.live_action))
        |> assign(:post, Blog.get_post(slug, current_user, preload: [:tags]))}
  end

  @impl true
  def render(assigns) do
    ~L"""
    ...
    """
  end

  defp page_title(:show), do: "Show Post"
end