Question

我想在过滤计数中使用django序列化程序列表（Model＆lt; - ＆gt; Foreign＆lt; - ＆gt; Foreign（Count））

看我的模特

class Test(models.Model):
   item = CharField
   title = CharField

class TestChild(models.Model):
   test = ForeignKey(Test)
   child_title = CharField

class TestChildType(model.Model):
   child = ForeignKey(TestChild)
   type = BooleanField

测试ChildType模型类型字段使用

filter(type=false).count()
filter(type=true).count()

testFalseCount过滤false值 testTrueCount过滤真值

并想要序列化器

{
   item:'mouse',
   title:'goood Mouse'
   child:[
             {
                child_title:'childGood'
                testFalseCount:4
                testTrueCount:3
             },
             ...
         ]
}

Answer 1

from rest_framework import serializers

class TestChildSerializer(serializers.ModelSerializer):
    testFalseCount = serializers.SerializerMethodField()
    testTrueCount = serializers.SerializerMethodField()

    @staticmethod
    def get_testFalseCount(obj):
        return obj.filter(type=false).count()

    @staticmethod
    def get_testTrueCount(obj):
        return obj.filter(type=true).count()

    class Meta:
        model = Test

class TestSerializer(serializers.ModelSerializer):
    child = serializers.SerializerMethodField()

    @staticmethod
    def get_child(obj):
        return [TestChildSerializer(child).data for child in obj.testchild_set.all()]

    class Meta:
        model = Test

django两个模型序列化器在过滤计数

1 个答案: