This question is being asked to expand and fill in the holes from this one: Return results from multiple models with Django REST Framework
my goal is to return a json object that I will use to dynamically populate the options in various select statements in my html code.
so I want to grab a attribute from model a, another from model b etc
then I want all the values from attribute a and b and c etc
to be in a value as a JSON array to a key so
json = {
modelA: {'atter1, atter2, atter3}
modelB: {'atter1, atter2, atter3}
model..:{you get the point}
}
this part from the post referenced above makes sense:
class TimelineViewSet(viewsets.ModelViewSet):
"""
API endpoint that lists all tweet/article objects in rev-chrono.
"""
queryset = itertools.chain(Tweet.objects.all(), Article.objects.all())
serializer_class = TimelineSerializer
what doesn't is this:
class TimelineSerializer(serializers.Serializer):
pk = serializers.Field()
title = serializers.CharField()
author = serializers.RelatedField()
pub_date = serializers.DateTimeField()
how do I set the the seperate model attributes to the correct json key?
I assume its something similar to a serializer relation but these values aren't related to eachother via onetoone, onetomany, or many to many. I just want to grab all this info at once instead of creating an api for each value.
I am a lost little girl and I am asking you to help me find my way home.
You'll find things easier in Django REST Framework if you design your response format rationally.
It seems a bit vague at the moment, but I would suggest something like:
{
"tweets": [
{"tweet_attr_A": value_1, ...}, // first tweet
{"tweet_attr_A": value_2, ...}, // second tweet
//etc
],
"articles": [
{"id": 1, ...}, // first article
{"id": 2, ...}, // second article
//etc
]
}
We can express this with three serializers, like:
class TweetSerializer(serializers.ModelSerializer):
class Meta:
model = Tweet
class ArticleSerializer(serializers.ModelSerializer):
class Meta:
model = Article
class TimelineSerializer(serializers.Serializer):
tweets = TweetSerializer(many=True)
articles = ArticleSerializer(many=True)
http://www.django-rest-framework.org/api-guide/serializers/#dealing-with-nested-objects
Then, because we're using more than one model, it's easiest just to define your own custom viewset rather than trying to shoe-horn this into DRF's magic ModelViewSet type.
http://www.django-rest-framework.org/api-guide/viewsets/#example
First we need an object type to pass into our TimelineSerializer. It should have two attributes: tweets and articles
from collections import namedtuple
Timeline = namedtuple('Timeline', ('tweets', 'articles'))
Then we'll define the custom viewset to fetch the tweets and articles, instantiate a Timeline object and return the TimelineSerializer data:
class TimelineViewSet(viewsets.ViewSet):
"""
A simple ViewSet for listing the Tweets and Articles in your Timeline.
"""
def list(self, request):
timeline = Timeline(
tweets=Tweet.objects.all(),
articles=Article.objects.all(),
)
serializer = TimelineSerializer(timeline)
return Response(serializer.data)
I had a same situation to serialize multiple models to fetch filtered output from each serialize model to use from one single api. I came across this module to achieve this result.
