Thank you very much.
I've tried this approach but with ModelSerializer, and i couldn't find a
field.
It was my mistake.
I'll try with Serializer.
пятница, 20 мая 2016 г., 1:09:42 UTC+3 пользователь Info Cascade написал:
>
> Eugene,
>
> I recently did this. The JSON would be something like
>
> {"location": { "subfield": "some value" },
> "otherfield": "othervalue"
> }
>
> I think I had to use the get_value() or get_attribute() methods because
> processing the subfield required access to one of the other fields
> higher up in the JSON hierarchy, so I needed the whole dictionary.
> However, that part is not included here, for simplicity.
>
> class LocationField(serializers.Field):
> def to_internal_value(self, data):
> subfield = None
> try:
> # pick out the location dict
> location = data.get('location')
>
> # pick these out first
> subfield = location.get('subfield')
> except:
> ValidationError("oops!")
>
> return {
> 'subfield': subfield,
> }
>
> def get_value(self, dictionary):
> """ Get the location dictionary out of the data dictionary, prior
> to calling to_internal_value()
> """
> return dictionary
>
> def get_attribute(self, obj):
> return obj
>
> def to_representation(self, obj):
> subfield = ''
> try:
> subfield = obj.subfield
> except Exception, e:
> log.warn('Unrecognized location: %s', e)
>
> return {
> 'subfield':subfield,
> }
>
> class MyModelAbstractSerializer(serializers.Serializer):
> location = LocationField(required=False, allow_null=True)
>
> def create(self, validated_data):
> location = validated_data.pop('location')
> validated_data['subfield'] = location['subfield']
>
> instance = MyModel(**validated_data)
> instance.save()
> return instance
>
> def update(self, instance, validated_data):
> <get the location data same as for create()>
>
>
>
> On 05/19/2016 09:14 AM, Eugene Lisitsky wrote:
> > Hi!
> >
> > I have to deal with API with encapsulated data, like this:
> >
> > |
> > {
> > "action":"update",
> > "issue":{
> > "id":123,
> > "Key":"KEY-234",
> > "fields":{
> > "creator":"bill",
> > "summary":"The issue summary",
> > "category":"cool"},
> > "user":"bob",
> > "timestamp":3555455
> > }
> >
> > |
> >
> > I need to take some fields from `issue` and put the data to some flat
> > model like:
> >
> > |
> > classIssue(models.Model):
> > key =models.CharField(...)
> > summary =models.CharField(...)
> > category =models.CharField(...)
> > |
> >
> > But here field `key` and field `summary` are located in different json
> > objects. How can I extract summary during parsing?
> >
> > How to write a Serializer?
> >
> > I've tried to make something using `.to_internal_value()` and
> > `.representation()` but it looks ugly.
> > Also it doesn't work, because it tries to find `summary` field during
> > validation and fails.
> >
> > Have I to write down my own Field class which will be capable of some
> > specific parsing like looking into nested objects.
> > How to make a representation for this field if I home some of them in
> > one serializer? I will have to merge output into one json object.
> >
> > Thank you.
> >
> >
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