title: Django JSONField contains list of values
body: <p>I have values in 'codes' JSONField structured like this:</p>
  
  <pre><code>[{"x": "723"}, {"x": "614"}]
  </code></pre>
  
  <p>I need to get Events objects where event.codes "x" key is IN a list of values, for example ['723', '332', ..]</p>
  
  <p>EDIT</p>
  
  <p>The model is:</p>
  
  <pre><code>from django.contrib.postgres.fields import JSONField
  
  class Events(models.Model):
      codes = JSONField(null=False, blank=True, default={})
  </code></pre>