Update AuthorRole and SelectedAuthor component to require Author.

lib/decentralised_book_index/metadata/author_role.ex

@@ -27,7 +27,7 @@ defmodule DecentralisedBookIndex.Metadata.AuthorRole do
     create :create do
       primary? true
       accept [:id, :order, :role]
-      argument :author_id, :uuid
+      argument :author_id, :uuid, allow_nil?: false
 
       change fn changeset, _ ->
         author_id =
@@ -57,7 +57,7 @@ defmodule DecentralisedBookIndex.Metadata.AuthorRole do
     update :update do
       primary? true
       accept [:order, :role]
-      argument :author_id, :uuid, allow_nil?: true
+      argument :author_id, :uuid, allow_nil?: false
       require_atomic? false
 
       change fn changeset, _ ->
@@ -121,7 +121,7 @@ defmodule DecentralisedBookIndex.Metadata.AuthorRole do
     end
 
     belongs_to :author, Metadata.Author do
-      allow_nil? true
+      allow_nil? false
       public? true
     end
   end

lib/decentralised_book_index_web/components/my_components/selected_author.ex

@@ -2,6 +2,8 @@ defmodule DecentralisedBookIndexWeb.Components.MyComponents.SelectedAuthor do
   use Phoenix.Component
   use DecentralisedBookIndexWeb, :verified_routes
 
+  alias DecentralisedBookIndexWeb.CoreComponents
+
   attr :author_form, :map, default: nil
   attr :form_path, :string, default: ""
   attr :class, :string, default: ""
@@ -16,16 +18,32 @@ defmodule DecentralisedBookIndexWeb.Components.MyComponents.SelectedAuthor do
         DecentralisedBookIndex.Metadata.get_author_by_id!(author_id)
       end
 
-    assigns = assign(assigns, :author, author)
+    errors =
+      if Phoenix.Component.used_input?(assigns.author_form), do: assigns.author_form.errors, else: []
+    IO.inspect("errors")
+    IO.inspect(errors)
+
+    assigns =
+      assigns
+      |> assign(:author, author)
+      |> assign(:errors, Enum.map(errors, &CoreComponents.translate_error(&1)))
 
     ~H"""
-    <button type="button" phx-click="open-select-author" phx-target={@notify_component} phx-value-path={@form_path} class={"text-white bg-blue-700 hover:bg-blue-800 focus:outline-none focus:ring-4 focus:ring-blue-300 font-medium rounded-full text-sm px-5 py-2.5 text-center dark:bg-blue-600 dark:hover:bg-blue-700 dark:focus:ring-blue-800 #{@class}"}>
+    <button
+      type="button"
+      phx-click="open-select-author"
+      phx-target={@notify_component}
+      phx-value-path={@form_path}
+      class={"text-white bg-blue-700 hover:bg-blue-800 focus:outline-none focus:ring-4 focus:ring-blue-300 font-medium rounded-full text-sm px-5 py-2.5 text-center dark:bg-blue-600 dark:hover:bg-blue-700 dark:focus:ring-blue-800 #{@class}"}
+    >
       <%= if @author != nil do %>
         {@author.name}
       <% else %>
         Select an author
       <% end %>
     </button>
+
+    <CoreComponents.error :for={msg <- @errors}>{msg}</CoreComponents.error>
     """
   end
 end

lib/decentralised_book_index_web/live/book_live/form_component.ex

@@ -236,7 +236,7 @@ defmodule DecentralisedBookIndexWeb.BookLive.FormComponent do
             </td>
             <td class="px-3 w-48">
               <label for={author_roles_form[:author_id].id} class="hidden">Type</label>
-              <.input field={author_roles_form[:author_id]} type="hidden" />
+              <.input field={author_roles_form[:author_id]} type="hidden" show_errors?={false} />
               <.selected_author
                 author_form={author_roles_form[:author_id]}
                 notify_component={@notify_component}