如何根据从另一个table数据中获取的id获取table数据（包括子table和子子数据）？姜戈

Question

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company = Company.objects.get(id = company_id)  # getting input from django urls (<int:company_id>)
vehicles = CompanyContainVehicles.objects.filter(company_id=company.id)  # Give all rows having same id (company.id)
all_vehicles = Vehicle.objects.filter(companies=company)  # Gives all row with id provide by company
all_vehicles_parts = VehiclePart.objects.filter(__________) # Not Working

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class Company(models.Model):
    name = models.CharField(max_length=255)
    slug = models.SlugField(blank=True, null=True, unique=True)
    description = models.TextField()

class Vehicle(models.Model):
    vehicle_number = models.IntegerField()
    name = models.CharField(max_length=255)
    slug = models.SlugField(blank=True, null=True, unique=True)
    companies = models.ManyToManyField(
        Company,
        through='CompanyVehicle',
        related_name='companies'
    )

class CompanyVehicle(models.Model):
    company = models.ForeignKey(Company, on_delete=models.CASCADE)
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE)
    created_at = models.DateTimeField(auto_now_add=True)

class VehiclePart(models.Model):
    id = models.AutoField(primary_key=True)
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE)
    type = models.ForeignKey(PartType, on_delete=models.CASCADE)
    created_at = models.DateTimeField(auto_now_add=True, blank=True)

我如何用他们的载具获得 VehiclePart？（我想我会把所有数据都放在一个变量中，我们应该将它分开并与他们的车辆相加）。另外，如果 VehiclePart 包含一个名为 VehiclePartDetail 的子 class，我们可以做什么来访问数据？

Answer 1

I think I will give all the data in a variable and we should divide it and add with their Vehicle.

你不必。 Django 可以反向读取 ForeignKey 关系。您可以查询：

qs = Vehicle.objects<strong>.prefetch_related('vehiclepart_set')</strong>

然后您可以枚举查询集，并且对于每个 Vehicle 对象，使用 .vehiclepart_set.all() 访问它。例如：

for item in qs:
    print(vehicle_name)
    for part in item<strong>.vehiclepart_set.all()</strong>:
        print(part.id)

如何根据从另一个table数据中获取的id获取table数据（包括子table和子子数据）？姜戈

How to get table data (including child table and sub child data) based on id which obtains from another table data? Django

python

django

django-models

django-views

django-database-functions

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