title: JSON auto adding backslashes
body: <p>I'm trying to pass a GeoJson response that comes from a function called db.session.query(func.ST_AsGeoJSON(self.geometry)).first(), using GeoAlchemy and PostGres. When printing, shows:</p>
  <pre><code>('{&quot;type&quot;:&quot;Polygon&quot;,&quot;coordinates&quot;:[[[-38.4105,-12.9232],[-38.4205,-12.9232],[-38.4305,-12.9232],[-38.4505,-12.9232],[-38.4105,-12.9232]]]}',)
  </code></pre>
  <p>But when i try to add this to other Json, like that:</p>
  <pre><code>    geojson = {
          'geometry': db.session.query(func.ST_AsGeoJSON(self.geometry)).first(),
          'type': 'Feature',
          'properties': {
              'Nome': 'Default',
              'Qualidade': 'Default'
          },
      }
  </code></pre>
  <p>The response that comes to the website is full of backslashes:</p>
  <p><a href="https://i.stack.imgur.com/xoUWe.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xoUWe.png" alt="enter image description here" /></a></p>
  <p>I need to properly pass the geometry response to the geojson.</p>