title: How to generate a model for a mongoengine Document from an already existing collection
body: <p>There is an existing collection in mongo called <code>students</code>. Is there a way where I don't have to type out the schema for all the fields and directly import all the fields from the collection?</p>
  <pre><code>class Student(DynamicDocument):
      meta = {'collection': 'students'}
      name = StringField() # I want to avoid writing this for all the fields in the collection
      rollNo = IntField()
      address = StringField()
  </code></pre>