title: Combine MongoDb clients: pyMongo and MongoEngine
body: <p>In my web application, I use <code>Flask</code> as framework and <code>MongoDB</code> as persistent layer. There are multiple libraries to connect to <code>MongoDB</code>. I am currently using the low-level lib <code>pyMongo</code>. However, I would like to combine it with <code>MongoEngine</code> for some models.</p>
  
  <p>The only approach I see is to create an instance of both clients. This looks a big doggy. Is there a simpler way to combine these libraries (<code>pyMongo</code>, <code>MongoEngine</code>) such that they use the same database (with different collections). </p>