最有可能发生这种情况，因为自定义表名称用于模型(使用set_table_name)或模型在模块中.

Most likely this happens because a custom table name is used for a Model (using the set_table_name) or the model is in a module.

要解决此问题，您需要在fixtures :all行之前的test_helper.rb中添加set_fixture_class行:

To solve, you need to add a set_fixture_class line in the test_helper.rb before the fixtures :all line:

class ActiveSupport::TestCase

  self.use_transactional_fixtures = true
  .
  .
  .
  set_fixture_class my_table_name: MyModule::MyClass

  fixtures :all

end

在这种情况下，灯具文件应名为my_table_name.yml

In this case the fixtures file should be called my_table_name.yml