title: mongoengine +django how to count the number of items of same content
body: <p>I want to count all the numbers of different values in a field.there is no "annotate()" to use in mongoengine ,then how could i count the number and order them by numbers</p>
  
  <p>The only way i  thought out to solve this is use"distinct()"to find out the different values and then use "count()"to count each of the values
  it's a stupid way to realize the result i want</p>
  
  <p>Do you have any other ways ?</p>