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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