DRF:如何在json中将多对多字段连接成字符串

Question

models.py

class SalesPerson(models.Model):
    name = models.CharField(max_length=50)
    office = models.ForeignKey(Location, on_delete=models.SET_NULL, null=True)

class Project(models.Model):
    title = models.CharField(max_length=50)
    leader = models.ForeignKey(SalesPerson, on_delete=models.SET_NULL, null=True,related_name='leader')    
    location = models.ForeignKey(Location, on_delete=models.SET_NULL, null=True)
    product = models.ManyToManyField(Product)    
    sales_person = models.ManyToManyField(SalesPerson)

serializers.py

class ProjectSerializer(serializers.ModelSerializer):
    leader_name= serializers.ReadOnlyField(source='leader.name')
    location_name= serializers.ReadOnlyField(source='location.name')
    product = serializers.SlugRelatedField(read_only=True, slug_field='name', many=True)    
    sales_person = serializers.SlugRelatedField(read_only=True, slug_field='name', many=True)
    class Meta:
        model = Project
        fields = ('id', 'title', 'leader_name', 'location_name', 'product', 'sales_person')

class SPSerializer(serializers.ModelSerializer):
    projects = ProjectSerializer(many=True, read_only=True, source='project_set')
    office_name= serializers.ReadOnlyField(source='office.city')
    class Meta:
        model = SalesPerson
        fields = ('id', 'name', 'office_name', 'email', 'projects')

结果：

{
        "id": 2,
        "name": "Angela",
        "office_name": "NSW Sydney",
        "email": "angela@angela.com",
        "projects": [
            {
                "id": 1,
                "title": "Mall Orchid",
                "leader_name": "Boris",
                "product": [
                    "Split wall mounted"
                ],
                "sales_person": [
                    "Angela",
                    "Boris",
                    "David"
                ],                
            },
            {
                "id": 6,
                "title": "Mall Petunia",
                "leader_name": "Boris",
                "product": [
                    "Split duct"
                ],
                "sales_person": [
                    "Angela",
                    "Boris",
                    "David"
                ],                
            },            
        ]
    },

我将使用react native来使用json。

我知道如何遍历“项目”

但是，我希望避免迭代"sales_person“，以使呈现数组更简单

所以我确定我必须把sales_person变成一个字符串，但是今天我用谷歌搜索了好几个小时，就是找不到答案

如果可能的话，我希望在Django Rest框架中做到这一点，而不是在Expo React Native中

所以简而言之，我想要得到这样的结果：

{
        "id": 2,
        "name": "Angela",
        "office_name": "NSW Sydney",
        "email": "angela@angela.com",
        "projects": [
            {
                "id": 1,
                "title": "Mall Orchid",
                "leader_name": "Boris",
                "product": [
                    "Split wall mounted"
                ],
                "sales_person": "Angela", "Boris", "David",                
            },
            {
                "id": 6,
                "title": "Mall Petunia",
                "leader_name": "Boris",
                "product": [
                    "Split duct"
                ],
                "sales_person": "Angela", "Boris", "David",                
            },            
        ]
    },

非常感谢你的帮助。

Answer 1

我找到了答案

我写这篇文章是为了将来参考。

class ProjectSerializer(serializers.ModelSerializer):
    leader_name= serializers.ReadOnlyField(source='leader.name')
    location_name= serializers.ReadOnlyField(source='location.city')
    product = serializers.SlugRelatedField(read_only=True, slug_field='name', many=True)
    sales_person = serializers.SerializerMethodField('get_sales_person')
    class Meta:
        model = Project
        fields = ('id', 'title', 'leader_name', 'location_name', 'product', 'sales_person')

    def get_sales_person(self, obj):
        return ', '.join([sales_person.name for sales_person in obj.sales_person.all()])