Unit testing phoenix with put does not change map

Hello!

I’m trying to do a unit test with ex_machina like so

    test "renders errors when data is invalid", %{conn: conn,  group: group, shipment: shipment, route: route} do
      conn = put conn, group_shipment_route_path(conn, :update, group, shipment, route), route: params_for(:invalid_route)
      assert html_response(conn, 200) =~ "Edit Route"
    end
  end

where the value I want to place in looks like this

  def invalid_route_factory do
    %Route{
        label: nil
    }

  end

my changeset and schema looking like this

  schema "routes" do
    field :label, :string, null: false
    field :address, :string
    field :date, :string
    field :groups, :string
    field :checklist, {:array, :string}
    belongs_to :shipment, Shipment # on_delete set in database via migration

    timestamps()
  end

  @doc false
  def changeset(route, attrs) do
    route
    |> cast(attrs, [:address, :date, :groups, :label, :shipment_id, :checklist])
    |> validate_required([:label, :shipment_id])
  end
end

and the function I am trying to test looking like this

  def update(conn, %{"route" => route_params} = params) do
    { group_id, shipment_id, route_id } = get_ids(params)
    route = Shipments.get_route!(route_id)
    case Shipments.update_route(route, route_params) do
      {:ok, route} ->
        conn
        |> put_flash(:info, "Route updated successfully.")
        |> redirect(to: group_shipment_route_path(conn, :show, group_id, shipment_id, route))
      {:error, %Ecto.Changeset{} = changeset} ->
        render(conn, "edit.html", group: group_id, shipment: shipment_id, route: route, changeset: changeset)
    end
  end

the error I get indicates that the case returns {:ok, route} rather than :error, which should not be the case since :label should be validated against null as you can see in my schema.

This is the error I get that indicates I get {:ok, route}, and in my conn struct I see the route wasn’t created from my ex_machina factory.

  1) test update route renders errors when data is invalid (FerryWeb.RouteControllerTest)
     test/ferry_web/controllers/route_controller_test.exs:69
     ** (RuntimeError) expected response with status 200, got: 302, with body:
     <html><body>You are being <a href="/groups/74/shipments/183/routes/120">redirected</a>.</body></html>
     code: assert html_response(conn, 200) =~ "Edit Route"
     stacktrace:
       (phoenix) lib/phoenix/test/conn_test.ex:362: Phoenix.ConnTest.response/2
       (phoenix) lib/phoenix/test/conn_test.ex:376: Phoenix.ConnTest.html_response/2
       test/ferry_web/controllers/route_controller_test.exs:75: (test)

Is there anyway I can debug why this is happening?