我无法从序列化程序中检索所需的所有字段。 情形:
我有两张桌子:Item&仓库。这些表通过名为InventoryStatus的表通过M2M关系连接。我需要的是从InventoryStatus表中获取带有嵌套仓库信息+状态字段的项目信息。 问题是,我无法获得"状态"场....
型号:
class InventoryItem(models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
code = models.CharField(max_length=25, null=False, blank=True)
orgid = models.ForeignKey('glonass.Company', null=True, related_name='inventory_items_company')
title = models.CharField(max_length=150, null=False, blank=True)
inventory = models.ManyToManyField('CompanyBranch', through='InventoryStatus', related_name='branch_iventoryStatus')
class CompanyBranch(BaseDataDescTime, LocationInfo, PostInfo, PoboxInfo, ContactInfo):
id = models.UUIDField(primary_key=True, default=uuid.uuid4,
orgid = models.ForeignKey('glonass.Company', null=True, related_name='branches')
slug = models.SlugField(max_length=150, blank=True, null=False)
class InventoryStatus(models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
inventoryitem = models.ForeignKey('InventoryItem', related_name='inventory_status_items', null=True)
orgid = models.ForeignKey('Company', null=True, related_name='inventory_status_company')
companybranch = models.ForeignKey('CompanyBranch', related_name='inventory_status_warehouses', null=True)
status = models.DecimalField(max_digits=9, decimal_places=2, null=True, blank=True, default=0)
串行器:
class InventoryStatusSerializer(serializers.HyperlinkedModelSerializer):
class Meta:
model = InventoryStatus
class CompanyBranchSerializer(serializers.HyperlinkedModelSerializer):
class Meta:
model = CompanyBranch
class InventoryItemSerializer(serializers.HyperlinkedModelSerializer):
inventory = CompanyBranchSerializer(many=True)
class Meta:
model = InventoryItem
需要输出:
[
{
'id': 'xxxxxxxxxxxxx',
'title': 'Car',
'inventory': [
{
'id': 'yyyyyyyyyyy',
'title': 'warehouse 1',
'status': 50
},
{
'id': 'zzzzzzzzzzzz',
'title': 'warehouse 2',
'status': 10
}
]
}
]
答案 0 :(得分:2)
问题是M2M关系直接给出相关对象而没有“直通”表上的任何信息,当你想在“通过”表中序列化并获取一些信息时会很麻烦。为了解决这个问题,我通常使用“通过”关系从“通过”表和相关项中获取信息。
在你的情况下,它可能看起来像:
class InventoryStatusSerializer(serializers.ModelSerializer):
companybranch = CompanyBranchSerializer(many=True, read_only=True)
class Meta:
model = InventoryStatus
fields = ('status', 'companybranch')
class InventoryItemSerializer(serializers.ModelSerializer):
inventory = InventoryStatusSerializer(source='inventory_status_items', many=True, read_only=True)
class Meta:
model = InventoryItem
这会产生类似的输出(注意:我认为你的意思是'slug',而不是你的例子的库存项目中的'title'):
[
{
'id': 'xxxxxxxxxxxxx',
'title': 'Car',
'inventory': [
{
'status': 50
'companybranch': {
'slug': 'warehouse 1',
'id': 'yyyyyyyyyyy', }
},
{
'status': 10
'companybranch': {
'slug': 'warehouse 2',
'id': 'zzzzzzzzzzzz',
}
}
]
}
]
现在,如果您想展平输出,只需更改InventoryStatusSerializer
:
class InventoryStatusSerializer(serializers.ModelSerializer):
id = serializers.ReadOnlyField(source='companybranch.id')
slug = serializers.ReadOnlyField(source='companybranch.slug')
class Meta:
model = InventoryStatus
fields = ('status', 'id', 'slug')
答案 1 :(得分:0)
您需要将字段部分添加到序列化程序'类如下:
class CompanyBranchSerializer(serializers.HyperlinkedModelSerializer):
class Meta:
model = CompanyBranch
fields = = ('id', 'orgid', 'slug')
你也需要为其他人做同样的事情。