Question

我有一个用于Happymeal的模块，该模块包含:food（字符串）和:toy（以:id作为主键的简单数据库对象）

构造函数如下：

defmodule Myapp.Happymeal do

  alias Myapp.{Repo, Toy}

  defstruct [
    :toy,
    :food
  ]

  @type t :: %__MODULE__{
          toy: Toy,
          food: String
        }

  def new(%{toy_id: toy_id, food: food}) do
    toy = Repo.get(Toy, toy_id)

    {:ok,
     %__MODULE__{
       toy: toy,
       food: food
     }}
  end
end

在Myapp.Happymeal.new(%{toy_id: 1, food: "burger"})中运行iex时，我按预期返回了一个Happymeal。

但是，当我通过测试运行它时

defmodule MyappTest do
  use ExUnit.Case 

  describe "Happymeal tests" do
    test "Happymeal can be created" do
      {:ok, happymeal} = Myapp.Happymeal.new(%{toy_id: 1, food: "burger"})

      IO.inspect(happymeal)
    end
  end
end

...我收到一个错误：

** (DBConnection.OwnershipError) cannot find ownership process for #PID<0.341.0>.

 When using ownership, you must manage connections in one
 of the four ways:

 * By explicitly checking out a connection
 * By explicitly allowing a spawned process
 * By running the pool in shared mode
 * By using :caller option with allowed process

 The first two options require every new process to explicitly
 check a connection out or be allowed by calling checkout or
 allow respectively.

 The third option requires a {:shared, pid} mode to be set.
 If using shared mode in tests, make sure your tests are not
 async.

 The fourth option requires [caller: pid] to be used when
 checking out a connection from the pool. The caller process
 should already be allowed on a connection.

 If you are reading this error, it means you have not done one
 of the steps above or that the owner process has crashed.

 See Ecto.Adapters.SQL.Sandbox docs for more information.
 code: {:ok, happymeal} = Myapp.Happymeal.new(%{toy_id: 1, food: "burger"})

如何在phoenix测试中使这种构造函数起作用？

编辑：我的test_helper.exs如下：

ExUnit.start()

Ecto.Adapters.SQL.Sandbox.mode(Myapp.Repo, :manual)

使用数据库组件测试构造函数

0 个答案: