edit action can't whine about missing container

fix the header while we're at it.

thing_controller.org

@@ -134,21 +134,29 @@ end
   </div>
 
   <div class="small-12 medium-4 cell">
+    <div class="grid-x small-up-4">
+      <div class="cell">
+        <%= link "edit", to: Routes.thing_path(@conn, :edit, @thing),
+            class: "button primary expanded" %>
+      </div>
+      <div class="cell">
+        <%= link "insert", to: Routes.thing_path(@conn, :insert, @thing),
+            class: "button secondary expanded" %>
+      </div>
+      <%= if @thing.container do %>
+        <div class="cell">
+          <%= link "next_to", to: Routes.thing_path(@conn, :insert, @thing.container),
+              class: "button expanded" %>
+        </div>
+      <% end %>
+      <div class="cell">
+        <%= link "move", to: Routes.thing_path(@conn, :move, @thing),
+            class: "button success expanded" %>
+      </div>
+    </div>
+
     <iframe src="https://www.youtube.com/embed/VFZNvj-HfBU" frameborder="0" allow="picture-in-picture" allowfullscreen></iframe>
 
-    <div class="grid-x">
-    <div class="small-4 cell">
-      <%= link "edit", to: Routes.thing_path(@conn, :edit, @thing),
-          class: "button primary expanded" %>
-    </div>
-    <div class="small-4 cell">
-      <%= link "insert", to: Routes.thing_path(@conn, :insert, @thing),
-          class: "button secondary expanded" %>
-    </div>
-    <div class="small-4 cell">
-      <%= link "move", to: Routes.thing_path(@conn, :move, @thing),
-          class: "button success expanded" %>
-    </div>
   </div>
 </div>
 #+end_src
@@ -207,7 +215,13 @@ end
 #+begin_src web :tangle lib/poka_ijo_web/templates/thing/edit.html.eex :mkdirp yes
 <div class="grid-x grid-padding-x">
   <div class="small-12 medium-8 cell">
-    <h2>New Thing</h2>
+    <h2>
+      <%= if @changeset.data.name do %>
+        Editing <%= @changeset.data.name %>
+      <% else %>
+        New Thing
+      <% end %>
+    </h2>
 
     <%= if assigns[:container] do %>
       will be stored in&nbsp;
@@ -222,7 +236,7 @@ end
       <% end %>
 
       <%# if it's shown in the UI and the changeset has the ID: %>
-      <%= if assigns[:container] && @changeset.changes.container_id do %>
+      <%= if assigns[:container] && Map.get(@changeset.data, :container_id) do %>
         <%= hidden_input f, :container_id %>
       <% end %>
 
@@ -426,6 +440,7 @@ def edit(conn, %{"id" => id}) do
   |> put_view(PokaIjoWeb.ThingView)
   |> render(:edit,
     thing: thing,
+    container: thing.container,
     changeset: changeset,
     page_title: "Poka Ijo: #{thing.name}"
   )

things.org

@@ -38,7 +38,11 @@ schema "things" do
   field :value_cents, :integer, default: 0
 
   belongs_to :container, PokaIjo.Thing
-  has_many   :contents, PokaIjo.Thing, foreign_key: :container_id
+  has_many :contents, PokaIjo.Thing, foreign_key: :container_id
+
+  has_many :photos, PokaIjo.Photo,
+    foreign_key: :thing_id,
+    on_delete: :delete_all
 
   timestamps()
 end