title: Django count objects created in current month
body: <p>I have field in my model:</p>
  
  <pre><code>class Order(BaseModel):
      created_at = models.DateTimeField(auto_now_add=True)
  </code></pre>
  
  <p>I need to count all Order objects created in current month.
  How can I do this in my views?</p>