neiam /gitgud

defmodule GitGud.Repo.Migrations.CreateLabels do
  use Ecto.Migration

  def change do
    create table(:labels) do
      add :repository_id, references(:repositories, on_delete: :delete_all), null: false
      add :name, :string, null: false, size: 80
      add :color, :string, null: false, size: 7
      add :description, :string, size: 255

      timestamps(type: :utc_datetime)
    end

    create unique_index(:labels, [:repository_id, :name])

    # Polymorphic join: one row per (label, target).
    # target_type ∈ {"issue", "pull_request"} for now.
    create table(:labelings) do
      add :label_id, references(:labels, on_delete: :delete_all), null: false
      add :target_type, :string, null: false
      add :target_id, :integer, null: false

      timestamps(type: :utc_datetime, updated_at: false)
    end

    create unique_index(:labelings, [:label_id, :target_type, :target_id])
    create index(:labelings, [:target_type, :target_id])
  end
end