add container tags

lib/cannery/containers/container_tag.ex

@@ -0,0 +1,31 @@
+defmodule Cannery.Containers.ContainerTag do
+  use Ecto.Schema
+  import Ecto.Changeset
+  alias Cannery.{Containers, Tags}
+
+  @primary_key {:id, :binary_id, autogenerate: true}
+  @foreign_key_type :binary_id
+  schema "container_tags" do
+    belongs_to :container, Containers.Container
+    belongs_to :tag, Tags.Tag
+
+    timestamps()
+  end
+
+  @type t :: %{
+          id: Ecto.UUID.t(),
+          container: Containers.Container.t(),
+          container_id: Ecto.UUID.t(),
+          tag: Tags.Tag.t(),
+          tag_id: Ecto.UUID.t(),
+          inserted_at: NaiveDateTime.t(),
+          updated_at: NaiveDateTime.t()
+        }
+
+  @doc false
+  def changeset(container_tag, attrs) do
+    container_tag
+    |> cast(attrs, [:tag_id, :container_id])
+    |> validate_required([:tag_id, :container_id])
+  end
+end

priv/repo/migrations/20210912224533_create_container_tags.exs

@@ -0,0 +1,17 @@
+defmodule Cannery.Repo.Migrations.CreateContainerTags do
+  use Ecto.Migration
+
+  def change do
+    create table(:container_tags, primary_key: false) do
+      add :id, :binary_id, primary_key: true
+
+      add :container_id, references(:containers, on_delete: :delete_all, type: :binary_id)
+      add :tag_id, references(:tags, on_delete: :delete_all, type: :binary_id)
+
+      timestamps()
+    end
+
+    create index(:container_tags, [:container_id])
+    create index(:container_tags, [:tag_id])
+  end
+end