保存数据时出现mongokit SchemaTypeError

Question

I have a mongokit model:

class Job(Document):
    __collection__ = 'jobs'
    structure = {
        'data': dict,
        'queue': basestring,
        'executor': mongokit.OR(basestring, dict),
        'state_name': basestring,
        'state': mongokit.OR(basestring, dict),
        'inherit': basestring,
    }
    default_values = {}
    required_fields = []

When I saved data, it raised SchemaTypeError: executor must be an instance of <basestring or dict> not unicode .

unicode is subtype of basestring . This error confused me.

These are my dependency versions:

• python: 2.7.10
• mongokit: 0.9.1.1

Answer 1

Some info about Strings in Python:

Firstly, "Everything is Object in python."

Object
  1. Basestring
       1. str
       2. unicode

To make it clear for understanding:

In [1]: unicode_str = u"I am unicode"
In [2]: normal_str = "I am normal string"

In [3]: isinstance(unicode_str, unicode)
Out[3]: True

In [4]: isinstance(unicode_str, str)
Out[4]: False

Moral: Type of unicode will be unicode and not basestring. Hence, you are getting such error.

So while passing a string data to field executor , cast it into string.