title: Store django forms.MultipleChoiceField in Models directly
body: <p>Say I have choices defined as follows:</p>
  
  <pre><code>choices = (('1','a'),
             ('2','b'),
             ('3','c'))
  </code></pre>
  
  <p>And a form that renders and inputs these values in a MultipleChoiceField,</p>
  
  <pre><code>class Form1(forms.Form):
      field = forms.MultipleChoiceField(choices=choices)
  </code></pre>
  
  <p>What is the right way to store <code>field</code> in a model.</p>
  
  <p>I can of course loop through the <code>forms.cleaned_data['field']</code> and obtain a value that fits in <code>models.CommaSeperatedIntegerField</code>.</p>
  
  <p>Again, each time I retrieve these values, I will have to loop and convert into options.</p>
  
  <p>I think there is a better way to do so, as in this way, I am in a way re-implementing the function that CommaSeperateIntegerField is supposed to do.</p>