Add AuthorRole to manage relationship between Author and Book.

priv/repo/migrations/20250309192029_create_author_role_and_update_relationships.exs

@@ -0,0 +1,75 @@
+defmodule DecentralisedBookIndex.Repo.Migrations.CreateAuthorRoleAndUpdateRelationships do
+  @moduledoc """
+  Updates resources based on their most recent snapshots.
+
+  This file was autogenerated with `mix ash_postgres.generate_migrations`
+  """
+
+  use Ecto.Migration
+
+  def up do
+    alter table(:authors) do
+      add :author_role_id, :uuid
+    end
+
+    create table(:author_role, primary_key: false) do
+      add :id, :uuid, null: false, default: fragment("gen_random_uuid()"), primary_key: true
+    end
+
+    alter table(:authors) do
+      modify :author_role_id,
+             references(:author_role,
+               column: :id,
+               name: "authors_author_role_id_fkey",
+               type: :uuid,
+               prefix: "public"
+             )
+    end
+
+    alter table(:author_role) do
+      add :role, :text, null: false
+      add :order, :bigint, null: false
+
+      add :inserted_at, :utc_datetime_usec,
+        null: false,
+        default: fragment("(now() AT TIME ZONE 'utc')")
+
+      add :updated_at, :utc_datetime_usec,
+        null: false,
+        default: fragment("(now() AT TIME ZONE 'utc')")
+
+      add :book_id,
+          references(:books,
+            column: :id,
+            name: "author_role_book_id_fkey",
+            type: :uuid,
+            prefix: "public"
+          ),
+          null: false
+    end
+  end
+
+  def down do
+    drop constraint(:author_role, "author_role_book_id_fkey")
+
+    alter table(:author_role) do
+      remove :book_id
+      remove :updated_at
+      remove :inserted_at
+      remove :order
+      remove :role
+    end
+
+    drop constraint(:authors, "authors_author_role_id_fkey")
+
+    alter table(:authors) do
+      modify :author_role_id, :uuid
+    end
+
+    drop table(:author_role)
+
+    alter table(:authors) do
+      remove :author_role_id
+    end
+  end
+end

priv/repo/migrations/20250309194121_update_author_role_to_allow_empty_role_and_book_relationship.exs

@@ -0,0 +1,23 @@
+defmodule DecentralisedBookIndex.Repo.Migrations.UpdateAuthorRoleToAllowEmptyRoleAndBookRelationship do
+  @moduledoc """
+  Updates resources based on their most recent snapshots.
+
+  This file was autogenerated with `mix ash_postgres.generate_migrations`
+  """
+
+  use Ecto.Migration
+
+  def up do
+    alter table(:author_role) do
+      modify :book_id, :uuid, null: true
+      modify :role, :text, null: true
+    end
+  end
+
+  def down do
+    alter table(:author_role) do
+      modify :role, :text, null: false
+      modify :book_id, :uuid, null: false
+    end
+  end
+end