Update Author to add the search action and refactor the format.

lib/decentralised_book_index/metadata.ex

@@ -2,11 +2,19 @@ defmodule DecentralisedBookIndex.Metadata do
   use Ash.Domain,
     otp_app: :decentralised_book_index
 
+  alias DecentralisedBookIndex.Metadata
+
   resources do
     resource DecentralisedBookIndex.Metadata.Book do
       define :create_book,
         action: :create,
-        args: [:title, :isbn, :description, :author_roles, {:optional, :book_editions_registry_id}]
+        args: [
+          :title,
+          :isbn,
+          :description,
+          :author_roles,
+          {:optional, :book_editions_registry_id}
+        ]
 
       define :add_book_to_related_editions_registry,
         action: :add_book_to_related_editions_registry,
@@ -31,6 +39,7 @@ defmodule DecentralisedBookIndex.Metadata do
       define :list_authors, action: :read
       define :get_author_by_id, args: [:id], action: :by_id
       define :get_author_alternative_names, args: [:author], action: :get_alternative_names
+      define :search_author, action: :search, args: [:name]
       define :update_author, action: :update
       define :destroy_author, action: :destroy
     end

lib/decentralised_book_index/metadata/author.ex

@@ -45,9 +45,14 @@ defmodule DecentralisedBookIndex.Metadata.Author do
         if related_author_id == nil do
           Ash.Changeset.add_error(changeset, :related_author_id, "Related author is empty")
         else
-          {:ok, related_author} = DecentralisedBookIndex.Metadata.get_author_by_id(related_author_id)
-
-          Ash.Changeset.force_change_attribute(changeset, :author_alias_registry_id, related_author.author_alias_registry_id)
+          {:ok, related_author} =
+            DecentralisedBookIndex.Metadata.get_author_by_id(related_author_id)
+
+          Ash.Changeset.force_change_attribute(
+            changeset,
+            :author_alias_registry_id,
+            related_author.author_alias_registry_id
+          )
         end
       end
     end
@@ -65,9 +70,22 @@ defmodule DecentralisedBookIndex.Metadata.Author do
         author = query.arguments.author
 
         DecentralisedBookIndex.Metadata.Author
-        |> Ash.Query.filter(author_alias_registry_id == ^author.author_alias_registry_id
-                            and id != ^author.id)
+        |> Ash.Query.filter(
+          author_alias_registry_id == ^author.author_alias_registry_id and
+            id != ^author.id
+        )
+      end
+    end
+
+    read :search do
+      argument :name, :ci_string do
+        constraints allow_empty?: true
+        default ""
       end
+
+      filter expr(contains(name, ^arg(:name)))
+
+      pagination offset?: true, default_limit: 10
     end
   end