How change returned value after annotation queryset of model?

[Seti Volkylany]

If I used annotation for get rating an object, I had new field 'rating' (is number). How change values field rating through SQl for return:

if rating = 0 return '0'

if rating = 1 return '+1'

if rating = -1 return '-1'

[Jani Tiainen]

On option could be using choices on a field definition.

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Jani Tiainen