在模块中评估，但类不是模块的一部分

Question

I have a module Database . In this module, eval("MyClass") returns Database::MyClass is inexistent . But I want it to be evaluated outside of the Database module. Who knows how this is to be done?

Answer 1

您应该尝试然后显式指定全局范围：

eval('::MyClass')

Answer 2

If you are trying to access a class by its name contained in a string, it might be a better choice to use Kernel.const_get. See this stack overflow post for more info: Get a class by name in Ruby?