Rails 测试失败，但系统工作正常

Question

setup do
    @prayer = prayers(:one)
end

test "should update prayer count" do
    assert_difference('@prayer.count', 1) do
        get "update_counter", {:id => @prayer.id}
    end
    assert_redirected_to root_path
end

# Running tests:

counter updated and saved. Count is: 
1
F

Finished tests in 1.374664s, 0.7275 tests/s, 0.7275 assertions/s.

  1) Failure:
PrayersControllerTest#test_should_update_prayer_count [test/controllers/prayers_controller_test.rb:147]:
"@prayer.count" didn't change by 1.
Expected: 1
  Actual: 0

update_counter 功能运行良好且报告正确，但测试失败。 @prayer 变量是指向数据库还是指向某个单独的夹具对象？我也尝试过@prayer = Prayer.find(1)，但结果相同。有什么想法吗？

夹具 yml 是：

one:
  id: 1
  prayer: Pray for nice weather
  count: 0
  user_id: 1

谢谢。

Answer 1

你可以试试reload方法：

assert_difference('@prayer.reload.count', 1) do

这会导致 Rails 重新加载 @prayer 从 DB 获取实际数据。