[英]django Many to Many with three table relationships together
我想創建一個具有 3 個模型和多對多關系的序列化器:
# models.py
class Permission(models.Model):
permission_name = models.CharField(max_length=20)
class Feature(models.Model):
feature_name = models.CharField(max_length=40)
class Role(models.Model):
name = models.CharField(max_length=40)
permissions = models.ManyToManyField(Permission, through='RolePermission')
features = models.ManyToManyField(Feature, through='RolePermission')
class RolePermission(models.Model):
role = models.ForeignKey(Role, on_delete=models.CASCADE)
permission = models.ForeignKey(Permission, on_delete=models.CASCADE)
feature = models.ForeignKey(Feature, on_delete=models.CASCADE)
樣本數據:
PERMISSION:
1 - add
2 - edit
3 - remove
4 - view
FEATURE:
1 - user
2 - device
ROLE:
1 - ROLE1
2 - ROLE2
我想從視圖中響應的數據:
[
{
"id": 1,
"name": "ROLE1",
"features": [
{
"id": 1,
"name": "user",
"permissions": [
{
"id": 1,
"name": "add"
},
{
"id": 2,
"name": "edit"
},
{
"id": 3,
"name": "remove"
},
{
"id": 4,
"name": "view"
}
]
},
{
"id": 2,
"name": "device",
"permissions": [
{
"id": 4,
"name": "view"
}
]
}
]
},
{
"id": 2,
"name": "ROLE2",
"features": [
{
"id": 1,
"name": "user",
"permissions": [
{
"id": 4,
"name": "view"
}
]
},
{
"id": 2,
"name": "device",
"permissions": [
{
"id": 4,
"name": "view"
}
]
}
]
}
]
但是我無法正確編寫序列化程序?
任何幫助表示贊賞。
我想你應該使用這個代碼,也許有不同的 field_names
class PermisionSerializer(serializers.ModelSerializer):
class Meta:
model = Permission
fields = ('name', )
class FeatureSerializer(serializers.ModelSerializer):
permissions = PermisionSerializer(many=True)
class Meta:
model = Feature
fields = ('name', 'permissions', )
class RoleSerializer(serializers.ModelSerializer):
features = FeatureSerializer(many=True)
class Meta:
model = Role
fields = ('name', 'features', )
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