From e4ae1572758758c115ac5a5d9263119bcd744f09 Mon Sep 17 00:00:00 2001
From: Claudio Ortolina <cloud8421@gmail.com>
Date: Thu, 12 Sep 2024 14:51:10 +0100
Subject: [PATCH] Associate artists and records

---
 lib/music_library/records/artist.ex           |  4 ++++
 lib/music_library/records/artist_record.ex    | 20 +++++++++++++++++++
 lib/music_library/records/record.ex           |  4 ++++
 .../20240912134607_create_artists_records.exs | 16 +++++++++++++++
 4 files changed, 44 insertions(+)
 create mode 100644 lib/music_library/records/artist_record.ex
 create mode 100644 priv/repo/migrations/20240912134607_create_artists_records.exs

diff --git a/lib/music_library/records/artist.ex b/lib/music_library/records/artist.ex
index 4b82fbc9..c41927b9 100644
--- a/lib/music_library/records/artist.ex
+++ b/lib/music_library/records/artist.ex
@@ -2,6 +2,8 @@ defmodule MusicLibrary.Records.Artist do
   use Ecto.Schema
   import Ecto.Changeset
 
+  alias MusicLibrary.{Records.ArtistRecord, Records.Record}
+
   @primary_key {:id, :binary_id, autogenerate: true}
   @foreign_key_type :binary_id
   schema "artists" do
@@ -9,6 +11,8 @@ defmodule MusicLibrary.Records.Artist do
     field :image, :string
     field :musicbrainz_id, Ecto.UUID
 
+    many_to_many :records, Record, join_through: ArtistRecord
+
     timestamps(type: :utc_datetime)
   end
 
diff --git a/lib/music_library/records/artist_record.ex b/lib/music_library/records/artist_record.ex
new file mode 100644
index 00000000..e87f1256
--- /dev/null
+++ b/lib/music_library/records/artist_record.ex
@@ -0,0 +1,20 @@
+defmodule MusicLibrary.Records.ArtistRecord do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  @primary_key {:id, :binary_id, autogenerate: true}
+  @foreign_key_type :binary_id
+  schema "artists_records" do
+    field :artist_id, :binary_id
+    field :record_id, :binary_id
+
+    timestamps(type: :utc_datetime)
+  end
+
+  @doc false
+  def changeset(artist_record, attrs) do
+    artist_record
+    |> cast(attrs, [])
+    |> validate_required([])
+  end
+end
diff --git a/lib/music_library/records/record.ex b/lib/music_library/records/record.ex
index dc9cc3f3..11519fc0 100644
--- a/lib/music_library/records/record.ex
+++ b/lib/music_library/records/record.ex
@@ -2,6 +2,8 @@ defmodule MusicLibrary.Records.Record do
   use Ecto.Schema
   import Ecto.Changeset
 
+  alias MusicLibrary.{Records.Artist, Records.ArtistRecord}
+
   @primary_key {:id, :binary_id, autogenerate: true}
   @foreign_key_type :binary_id
   schema "records" do
@@ -12,6 +14,8 @@ defmodule MusicLibrary.Records.Record do
     field :musicbrainz_id, Ecto.UUID
     field :genres, {:array, :string}
 
+    many_to_many :artists, Artist, join_through: ArtistRecord
+
     timestamps(type: :utc_datetime)
   end
 
diff --git a/priv/repo/migrations/20240912134607_create_artists_records.exs b/priv/repo/migrations/20240912134607_create_artists_records.exs
new file mode 100644
index 00000000..12a86eff
--- /dev/null
+++ b/priv/repo/migrations/20240912134607_create_artists_records.exs
@@ -0,0 +1,16 @@
+defmodule MusicLibrary.Repo.Migrations.CreateArtistsRecords do
+  use Ecto.Migration
+
+  def change do
+    create table(:artists_records, primary_key: false) do
+      add :id, :binary_id, primary_key: true
+      add :artist_id, references(:artists, on_delete: :nothing, type: :binary_id)
+      add :record_id, references(:records, on_delete: :nothing, type: :binary_id)
+
+      timestamps(type: :utc_datetime)
+    end
+
+    create index(:artists_records, [:artist_id])
+    create index(:artists_records, [:record_id])
+  end
+end