擅长:python、mysql、java
<p>您可以在类的<code>meta</code>dict中指定<a href="https://mongoengine-odm.readthedocs.org/en/latest/guide/defining-documents.html#indexes">indexes</a>:</p>
<pre><code>class SocialGroup(Document):
timestamp = DateTimeField(default=datetime.now)
course_name = StringField()
group_name = StringField(choices=[('A', 1), ('B', 1), ('C', 1),('D', 1), ('E', 1), ('F', 1), ('None',1)], default="None")
meta = {
'indexes': [
{'fields': ('course_name', 'group_name'), 'unique': True}
]
}
</code></pre>