title: GeoDjango: How to create a circle based on point and radius
body: <p>I have the following (simplified) Model:</p>
  
  <pre><code>class Zone(gismodels.Model):
      name = gismodels.CharField()
      poly = gismodels.PolygonField()
  </code></pre>
  
  <p>I want to create and save a polygon that represents a circle, based upon a given point and radius.</p>
  
  <p>The only way I can figure out how to achieve this, is to call the postgis ST_Buffer function using raw SQL. I'm really hoping that there is another way.</p>
  
  <p>Is it possible to access the GEOS buffer methods?</p>