[英]Add related ForeignKey fields with serializer in Django REST Framework
我正在使用Django 2.2和Django REST Framework
我有三个模特
class Plan(models.Model):
name = models.CharField(_('Plan Name'), max_length=100)
default = models.NullBooleanField(default=None, unique=True)
created = models.DateTimeField(_('created'), db_index=True)
quotas = models.ManyToManyField('Quota', through='PlanQuota')
class Quota(models.Model):
codename = models.CharField(max_length=50, unique=True)
name = models.CharFieldmax_length=100)
unit = models.CharField(max_length=100, blank=True)
class PlanQuota(models.Model):
plan = models.ForeignKey('Plan', on_delete=models.CASCADE)
quota = models.ForeignKey('Quota', on_delete=models.CASCADE)
value = models.IntegerField(default=1, null=True, blank=True)
我必须在计划序列化PlanQuota
中从PlanQuota
获取所有quota
及其价值,同时获取计划列表。
我有以下序列化程序
class PlanQuotaSerialier(serializers.ModelSerializer):
class Meta:
model = PlanQuota
depth = 1
fields = ['quota', 'value']
class PlanListSerializer(serializers.ModelSerializer):
plan_quota = PlanQuotaSerialier(read_only=True, many=True)
class Meta:
model = Plan
depth = 1
fields = ['name', 'default', 'created', 'plan_quota']
但是响应中没有plan_quota
。
如何在单个查询中添加每个计划的所有配额及其值(SQL JOIN)?
编辑2:
将source
添加到序列化器字段工作
plan_quota = PlanQuotaSerialier(source='planquota_set', many=True)
结果就像
"results": [
{
"name": "Test Plan 1",
"default": true,
"plan_quotas": [
{
"quota": {
"id": 1,
"order": 0,
"codename": "TEST",
"name": "Test Domain",
"unit": "count",
"description": "",
"is_boolean": false,
"url": ""
},
"value": 10
},
]
}
]
我可以使用plan_quotas
列表中的value
字段来quota
所有字段吗?
class PlanQuota(models.Model):
plan = models.ForeignKey('Plan', on_delete=models.CASCADE, related_name='plan_quotas')
quota = models.ForeignKey('Quota', on_delete=models.CASCADE)
value = models.IntegerField(default=1, null=True, blank=True)
class PlanListSerializer(serializers.ModelSerializer):
class Meta:
model = Plan
depth = 1
fields = ['name', 'default', 'created', 'plan_quotas']
这就是我解决它的方法。
对于第一个查询,添加了source
plan_quota = PlanQuotaSerialier(source ='planquota_set',many = True)
要删除quota
密钥,请在PlanQuotaSerializer
添加to_presentation()
def to_representation(self, instance): representation = super().to_representation(instance) if 'quota' in representation: representation['quota']['quota_id'] = representation['quota'].pop('id') representation.update(representation.pop('quota')) return representation
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