Sorry, I'm not sure if my understanding is correct.
In my view, you have user coin exchange and user_exchange_plan , four
models , like:
class User(models.Model):
...
class Coin(models.Model):
...
class Exchange(models.Model):
...
class UserExchangePlan(models.Model):
user = ForeignKey(User, ...)
coin = ForeignKey(Coin, ...)
exchange =ForeignKey(Exchange, ...)
now you want to create a user_exchange_plan with user_id coin_id exchange_id
just create your UserExchangePlanSerializers like:
class UserExchangePlanSerializers(ModelSerializer):
class Meta:
model = UserExchangePlan
fields = '__all__'
create your UserExchangePlanViewSet like:
class UserExchangePlanViewSet(ModelViewSet):
queryset = UserExchangePlan.objects.all()
serializer = UserExchangePlanSerializers
you can post {"user": <id>, "coin": <id>, "exchange": <id>,...} to create a
user_exchange_plan database data
if you want to list user_exchange_plan's user coin exchange with list data
type, you just need to create a new user_exchange_plan serializer like:
class ListUserExchangePlan(ModelSerializer):
user = YourUserSerializer()
coin = YourCoinSerializer()
exchange = YourExchangeSerializer()
class Meta:
model = UserExchangePlan
fields = '__all__'
You can build new YourUserSerializer/YourCoinSerializer/YourExc
hangeSerializer to your needs.
I hope my understanding is correct.
If you have other questions, you can email me directly.
By RyomaHan
2019年5月7日星期二 UTC+8下午8:47:51，Amit Singh写道：
>
> My Table structure is there are four tables
>
>
> user
> coin
> exchange
>
>
> their reference goes to
>
>
> user_exchange_plan
>
> with keys
>
>
> user_id, coin_id, exchange_id
>
>
> so i am creating a user exchange plan via api
> for this i am sending a request like
>
>
> { "user": 1, "coin": 1, "exchange": 1, "plan_type": null, ..... }
>
>
> but it is throwing validation error that all three are required. what
> could i be possibly doing wrong.
> how can i save foreign keys in this record.
>
> Following is the code for my serializer
>
> `class UserTradePlanSerializer(serializers.ModelSerializer):
>
> #code1
> user = serializers.PrimaryKeyRelatedField(queryset=SUser.objects.all())
> coin = serializers.PrimaryKeyRelatedField(queryset=Coin.objects.all())
> exchange = serializers.PrimaryKeyRelatedField(queryset=Exchange.objects.all())
>
> #code2
> # user = SUserSerializer()
> # coin = CoinSerializer()
> # exchange = ExchangeSerializer()
>
> def create(self, validated_data):
> return UserTradePlan.objects.create(**validated_data)
>
> class Meta:
> model = UserTradePlan
> fields = ("id", "user", "coin", "exchange", "plan_type", ....)
> depth = 1`
>
>
> if i activate the code written under #code1 then it will work as expected,
> but while retrieving it will not replace user with user object. it will
> return the id of that user plain.
>
>
> if i activate the code written under #code2 and comment the code #code1
> then while retrieving it replaces the user with object but it start
> throwing the validation error.
>
>
> what is the appropriate way to save and retrieve the values of association
> table. So that when saved it saves the id and when retrieved it replaces it
> by object. i haven't used user_id field do i need to add it to send the
> value?
>
>
> thanks
>
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