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docs/api-guide/serializers.md
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@ -520,6 +520,14 @@ You can add extra fields to a `ModelSerializer` or override the default fields b
Extra fields can correspond to any property or callable on the model.
**Note**: It is also possible to use the attributes of a ForeignKey field. For example you can get the first name of the User like this.
class UserSerializer(serializers.ModelSerializer):
first_name = serializers.CharField(source='user.first_name', read_only=True)
class Meta:
model = User
## Specifying read only fields
You may wish to specify multiple fields as read-only. Instead of adding each field explicitly with the `read_only=True` attribute, you may use the shortcut Meta option, `read_only_fields`.