# Ecto Context Module Template

Copy-pasteable template for a new Ecto schema + context + test following TowerOps conventions.

Replace `__CONTEXT__` with PascalCase context name (e.g., `Schedules`).
Replace `__SCHEMA__` with PascalCase schema name (e.g., `Schedule`).
Replace `__resource__` with snake_case (e.g., `schedule`).
Replace `__resources__` with plural snake_case (e.g., `schedules`).
Replace `__table__` with the database table name (e.g., `schedules`).

---

## `lib/towerops/__context__/__resource__.ex` (Schema)

```elixir
defmodule Towerops.__CONTEXT__.__SCHEMA__ do
  @moduledoc """
  Schema for __resources__.

  Describe what this resource represents and its relationships.
  """
  use Ecto.Schema

  import Ecto.Changeset

  alias Towerops.Organizations.Organization

  @primary_key {:id, :binary_id, autogenerate: true}
  @foreign_key_type :binary_id
  schema "__table__" do
    field :name, :string
    field :description, :string
    field :enabled, :boolean, default: true

    belongs_to :organization, Organization

    timestamps()
  end

  @required_fields ~w(name organization_id)a
  @optional_fields ~w(description enabled)a

  def changeset(__resource__, attrs) do
    __resource__
    |> cast(attrs, @required_fields ++ @optional_fields)
    |> validate_required(@required_fields)
    |> validate_length(:name, max: 255)
    |> validate_length(:description, max: 1000)
    |> foreign_key_constraint(:organization_id)
  end
end
```

---

## `lib/towerops/__context__.ex` (Context)

```elixir
defmodule Towerops.__CONTEXT__ do
  @moduledoc """
  Context for managing __resources__.
  """

  import Ecto.Query

  alias Towerops.__CONTEXT__.__SCHEMA__
  alias Towerops.Repo

  @preloads [:organization]

  def create___resource__(attrs) do
    %__SCHEMA__{}
    |> __SCHEMA__.changeset(attrs)
    |> Repo.insert()
  end

  def update___resource__(%__SCHEMA__{} = __resource__, attrs) do
    __resource__
    |> __SCHEMA__.changeset(attrs)
    |> Repo.update()
  end

  def delete___resource__(%__SCHEMA__{} = __resource__) do
    Repo.delete(__resource__)
  end

  def get___resource__!(id) do
    __SCHEMA__
    |> Repo.get!(id)
    |> Repo.preload(@preloads)
  end

  def list___resources__(organization_id, opts \\ []) do
    __SCHEMA__
    |> where([r], r.organization_id == ^organization_id)
    |> apply_filter(opts[:filter])
    |> order_by([r], desc: r.inserted_at)
    |> Repo.all()
    |> Repo.preload(@preloads)
  end

  defp apply_filter(query, :active) do
    where(query, [r], r.enabled == true)
  end

  defp apply_filter(query, :archived) do
    where(query, [r], r.enabled == false)
  end

  defp apply_filter(query, _), do: query
end
```

---

## Migration

```elixir
defmodule Towerops.Repo.Migrations.Create__SCHEMA__s do
  use Ecto.Migration

  def change do
    create table(:__table__, primary_key: false) do
      add :id, :binary_id, primary_key: true
      add :name, :string, null: false
      add :description, :text
      add :enabled, :boolean, default: true, null: false

      add :organization_id, references(:organizations, type: :binary_id, on_delete: :delete_all),
        null: false

      timestamps()
    end

    create index(:__table__, [:organization_id])
  end
end
```

---

## `test/towerops/__context___test.exs` (Context Tests)

```elixir
defmodule Towerops.__CONTEXT__Test do
  use Towerops.DataCase

  alias Towerops.__CONTEXT__
  alias Towerops.__CONTEXT__.__SCHEMA__

  setup do
    user = insert_user()
    {:ok, organization} =
      Towerops.Organizations.create_organization(%{name: "Test Org"}, user.id)

    %{organization: organization, user: user}
  end

  describe "create___resource__/1" do
    test "creates with valid attrs", %{organization: org} do
      attrs = %{
        name: "Test __RESOURCE_TITLE__",
        organization_id: org.id
      }

      assert {:ok, %__SCHEMA__{} = __resource__} = __CONTEXT__.create___resource__(attrs)
      assert __resource__.name == "Test __RESOURCE_TITLE__"
      assert __resource__.organization_id == org.id
    end

    test "fails without required fields" do
      assert {:error, changeset} = __CONTEXT__.create___resource__(%{})
      assert errors_on(changeset) |> Map.has_key?(:name)
      assert errors_on(changeset) |> Map.has_key?(:organization_id)
    end
  end

  describe "update___resource__/2" do
    test "updates with valid attrs", %{organization: org} do
      {:ok, __resource__} =
        __CONTEXT__.create___resource__(%{name: "Original", organization_id: org.id})

      assert {:ok, updated} = __CONTEXT__.update___resource__(__resource__, %{name: "Updated"})
      assert updated.name == "Updated"
    end
  end

  describe "delete___resource__/1" do
    test "deletes the resource", %{organization: org} do
      {:ok, __resource__} =
        __CONTEXT__.create___resource__(%{name: "To Delete", organization_id: org.id})

      assert {:ok, _} = __CONTEXT__.delete___resource__(__resource__)
      assert_raise Ecto.NoResultsError, fn -> __CONTEXT__.get___resource__!(__resource__.id) end
    end
  end

  describe "list___resources__/2" do
    test "lists resources for organization", %{organization: org} do
      {:ok, _} = __CONTEXT__.create___resource__(%{name: "Item 1", organization_id: org.id})
      {:ok, _} = __CONTEXT__.create___resource__(%{name: "Item 2", organization_id: org.id})

      __resources__ = __CONTEXT__.list___resources__(org.id)
      assert length(__resources__) == 2
    end

    test "filters by active status", %{organization: org} do
      {:ok, _} = __CONTEXT__.create___resource__(%{name: "Active", organization_id: org.id, enabled: true})
      {:ok, _} = __CONTEXT__.create___resource__(%{name: "Archived", organization_id: org.id, enabled: false})

      active = __CONTEXT__.list___resources__(org.id, filter: :active)
      assert length(active) == 1
      assert hd(active).name == "Active"
    end
  end

  describe "get___resource__!/1" do
    test "returns the resource with preloads", %{organization: org} do
      {:ok, created} = __CONTEXT__.create___resource__(%{name: "Find Me", organization_id: org.id})

      __resource__ = __CONTEXT__.get___resource__!(created.id)
      assert __resource__.name == "Find Me"
      assert __resource__.organization.id == org.id
    end
  end
end
```