爲什麼在setup_all塊的數據庫中插入的對象不會出現在測試塊中？

Question

我在控制器中有類似的測試，在測試塊中有setup_all插入。在這裏，我試圖在我的模型中允許同樣的事情，而且我似乎無法使其工作。

我有一個測試如下：

defmodule Faq.QuestionTest do 
    use Faq.ModelCase 

    alias Faq.Question 

    setup_all do 
    :ok = Ecto.Adapters.SQL.Sandbox.checkout(Repo) 

    Question.changeset(%Question{}, %{question: "Unanswered", answer: nil})               |> Repo.insert! 
    Question.changeset(%Question{}, %{question: "Answered", answer: "My published answer", published_at: Ecto.DateTime.utc(:usec)}) |> Repo.insert! 

    published_count = Question |> Question.published |> Repo.all |> Enum.count 
    assert 1 == published_count 

    IO.puts "SETUP_ALL" 

    :ok 
    end 

    describe "scopes" do 
    test "answered", meta do 
     published_count = Question |> Question.published |> Repo.all |> Enum.count 
     assert 1 == published_count 
    end 
    end 
end 

當我運行它，我有以下錯誤：

$ mix test test/models/question_test.exs 
warning: variable meta is unused 
    test/models/question_test.exs:21 

SETUP_ALL 


    1) test scopes answered (Faq.QuestionTest) 
    test/models/question_test.exs:21 
    Assertion with == failed 
    code: 1 == published_count 
    lhs: 1 
    rhs: 0 
    stacktrace: 
     test/models/question_test.exs:23: (test) 



Finished in 0.09 seconds 
1 test, 1 failure 

現在在setup_all塊我做出同樣的驗證，因爲我在做我的test區塊。爲什麼它會在測試中失敗，但通過setup_all？

Answer 1

所以事實證明，ModelCase運行的第一行setup_all再次在每次運行，從而使我的連接無效。這條線就在這裏：:ok = Ecto.Adapters.SQL.Sandbox.checkout(Repo)