Add the attribute for a avatar image url for Author.

lib/decentralised_book_index/metadata.ex

@@ -58,6 +58,7 @@ defmodule DecentralisedBookIndex.Metadata do
       define :get_author_alternative_names, args: [:author], action: :get_alternative_names
       define :search_author, action: :search, args: [:name]
       define :update_author, action: :update
+      define :assign_author_avatar_image, args: [:avatar_url], action: :assign_avatar_image
       define :destroy_author, action: :destroy
     end
 

lib/decentralised_book_index/metadata/author.ex

@@ -108,6 +108,10 @@ defmodule DecentralisedBookIndex.Metadata.Author do
 
       pagination offset?: true, default_limit: 10
     end
+
+    update :assign_avatar_image do
+      accept [:avatar_url]
+    end
   end
 
   attributes do
@@ -123,6 +127,11 @@ defmodule DecentralisedBookIndex.Metadata.Author do
       public? true
     end
 
+    attribute :avatar_url, :string do
+      allow_nil? true
+      public? true
+    end
+
     timestamps()
   end