Update AuthorRole delete logic to cascade if no Book.

lib/decentralised_book_index/metadata/author_role.ex

@@ -14,6 +14,10 @@ defmodule DecentralisedBookIndex.Metadata.AuthorRole do
   postgres do
     table "author_role"
     repo DecentralisedBookIndex.Repo
+
+    references do
+      reference :book, index?: true, on_delete: :delete
+    end
   end
 
   actions do

priv/repo/migrations/20250408105711_update_author_role_delete_logic_to_cascade_if_no_book.exs

@@ -0,0 +1,42 @@
+defmodule DecentralisedBookIndex.Repo.Migrations.UpdateAuthorRoleDeleteLogicToCascadeIfNoBook 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
+    drop constraint(:author_role, "author_role_book_id_fkey")
+
+    alter table(:author_role) do
+      modify :book_id,
+             references(:books,
+               column: :id,
+               name: "author_role_book_id_fkey",
+               type: :uuid,
+               prefix: "public",
+               on_delete: :delete_all
+             )
+    end
+
+    create index(:author_role, [:book_id])
+  end
+
+  def down do
+    drop_if_exists index(:author_role, [:book_id])
+
+    drop constraint(:author_role, "author_role_book_id_fkey")
+
+    alter table(:author_role) do
+      modify :book_id,
+             references(:books,
+               column: :id,
+               name: "author_role_book_id_fkey",
+               type: :uuid,
+               prefix: "public"
+             )
+    end
+  end
+end

priv/resource_snapshots/repo/author_role/20250408105712.json

@@ -0,0 +1,156 @@
+{
+  "attributes": [
+    {
+      "allow_nil?": false,
+      "default": "fragment(\"gen_random_uuid()\")",
+      "generated?": false,
+      "primary_key?": true,
+      "references": null,
+      "size": null,
+      "source": "id",
+      "type": "uuid"
+    },
+    {
+      "allow_nil?": true,
+      "default": "nil",
+      "generated?": false,
+      "primary_key?": false,
+      "references": null,
+      "size": null,
+      "source": "role",
+      "type": "text"
+    },
+    {
+      "allow_nil?": false,
+      "default": "nil",
+      "generated?": false,
+      "primary_key?": false,
+      "references": null,
+      "size": null,
+      "source": "order",
+      "type": "bigint"
+    },
+    {
+      "allow_nil?": false,
+      "default": "fragment(\"(now() AT TIME ZONE 'utc')\")",
+      "generated?": false,
+      "primary_key?": false,
+      "references": null,
+      "size": null,
+      "source": "inserted_at",
+      "type": "utc_datetime_usec"
+    },
+    {
+      "allow_nil?": false,
+      "default": "fragment(\"(now() AT TIME ZONE 'utc')\")",
+      "generated?": false,
+      "primary_key?": false,
+      "references": null,
+      "size": null,
+      "source": "updated_at",
+      "type": "utc_datetime_usec"
+    },
+    {
+      "allow_nil?": true,
+      "default": "nil",
+      "generated?": false,
+      "primary_key?": false,
+      "references": {
+        "deferrable": false,
+        "destination_attribute": "id",
+        "destination_attribute_default": null,
+        "destination_attribute_generated": null,
+        "index?": false,
+        "match_type": null,
+        "match_with": null,
+        "multitenancy": {
+          "attribute": null,
+          "global": null,
+          "strategy": null
+        },
+        "name": "author_role_dbi_server_id_fkey",
+        "on_delete": null,
+        "on_update": null,
+        "primary_key?": true,
+        "schema": "public",
+        "table": "dbi_servers"
+      },
+      "size": null,
+      "source": "dbi_server_id",
+      "type": "uuid"
+    },
+    {
+      "allow_nil?": true,
+      "default": "nil",
+      "generated?": false,
+      "primary_key?": false,
+      "references": {
+        "deferrable": false,
+        "destination_attribute": "id",
+        "destination_attribute_default": null,
+        "destination_attribute_generated": null,
+        "index?": true,
+        "match_type": null,
+        "match_with": null,
+        "multitenancy": {
+          "attribute": null,
+          "global": null,
+          "strategy": null
+        },
+        "name": "author_role_book_id_fkey",
+        "on_delete": "delete",
+        "on_update": null,
+        "primary_key?": true,
+        "schema": "public",
+        "table": "books"
+      },
+      "size": null,
+      "source": "book_id",
+      "type": "uuid"
+    },
+    {
+      "allow_nil?": true,
+      "default": "nil",
+      "generated?": false,
+      "primary_key?": false,
+      "references": {
+        "deferrable": false,
+        "destination_attribute": "id",
+        "destination_attribute_default": null,
+        "destination_attribute_generated": null,
+        "index?": false,
+        "match_type": null,
+        "match_with": null,
+        "multitenancy": {
+          "attribute": null,
+          "global": null,
+          "strategy": null
+        },
+        "name": "author_role_author_id_fkey",
+        "on_delete": null,
+        "on_update": null,
+        "primary_key?": true,
+        "schema": "public",
+        "table": "authors"
+      },
+      "size": null,
+      "source": "author_id",
+      "type": "uuid"
+    }
+  ],
+  "base_filter": null,
+  "check_constraints": [],
+  "custom_indexes": [],
+  "custom_statements": [],
+  "has_create_action": true,
+  "hash": "9E4F8AF2665BB1D2073A2FC4587C55DCB455E85298D4AADC87D221A8231771CD",
+  "identities": [],
+  "multitenancy": {
+    "attribute": null,
+    "global": null,
+    "strategy": null
+  },
+  "repo": "Elixir.DecentralisedBookIndex.Repo",
+  "schema": null,
+  "table": "author_role"
+}