问题描述
我正在尝试为 class SuperUserMan: UserMan 模型填充数据库中的数据
另外，我不会使用外键 ID，如下所示
示例 1：
object相反，我将使用各自模型的唯一值，如下所示
示例 2：
Employeemodels.py 文件
- model: employee.employee
pk: 1
fields:
user: 1
manager: NULL
department: 1
job_level: 5
created_at: '2021-06-03'
updated_at: '2021-06-03'
让我们考虑示例 2 我将像示例 2 那样填充数据 这样做
我们可以使用 - model: employee.employee
pk: 1
fields:
user: [manager.finance]
manager: NULL
department: [Finance]
job_level: [MNGR]
created_at: '2021-06-03'
updated_at: '2021-06-03'
模型中的 from django.db import models
from django.conf import settings
from django.db.models import Q
class TimestampedModel(models.Model):
created_at = models.DateField(auto_Now_add=True)
updated_at = models.DateField(auto_Now=True)
class Meta:
abstract = True
class DepartmentManager(models.Manager):
def get_by_natural_key(self,name):
return self.get(name=name)
class Department(TimestampedModel):
name = models.CharField(max_length=128,unique=True)
objects = DepartmentManager()
class Meta:
db_table = 'tc_departments'
def __str__(self):
return f'{self.name}'
class JobLevelManager(models.Manager):
def get_by_natural_key(self,handle):
return self.get(handle=handle)
class JobLevel(models.Model):
handle = models.CharField(max_length=32,unique=True)
display_name = models.CharField(max_length=64,null=True,blank=True)
objects = JobLevelManager()
class Meta:
db_table = 'tc_job_levels'
def __str__(self):
return f'{self.handle} and {self.display_name}'
class EmployeeManager(models.Manager):
def get_by_natural_key(self,user):
return self.get(user=user)
class Employee(TimestampedModel):
user = models.OnetoOneField(settings.AUTH_USER_MODEL,on_delete=models.PROTECT)
manager = models.ForeignKey('self',on_delete=models.CASCADE,limit_choices_to={'manager__isnull': True},blank=True)
department = models.ForeignKey(Department,on_delete=models.CASCADE)
job_level = models.ForeignKey(JobLevel,on_delete=models.CASCADE)
profile_pic = models.ImageField(upload_to='photos/%Y/%m/%d',max_length=128,blank=True)
objects = EmployeeManager()
class Meta:
db_table = 'tc_employees'
unique_together = [['department','job_level']]
def __str__(self):
return f'{self.user}'
class Asset(TimestampedModel):
class DeviceType(models.TextChoices):
PHONE = 'PH','Phone'
TABLET = 'TB','Tablet'
LAPTOP = 'LP','Laptop'
DESKTOP = 'DS','Desktop'
device_type = models.CharField(max_length=2,choices=DeviceType.choices,default=DeviceType.LAPTOP)
serial_number = models.CharField(max_length=32,unique=True)
assigned_to = models.ForeignKey(Employee,on_delete=models.PROTECT)
assigned_on = models.DateTimeField()
returned_on = models.DateTimeField(blank=True,null=True)
class Meta:
db_table = 'tc_assets'
def __str__(self):
return f'{self.device_type.label} serial: {self.serial_number}'
字段，因为 user 字段是唯一的
示例 3：
Employeeuser我面临的问题仅仅是因为示例 3
中的- model: employee.employee
pk: 1
fields:
user: [manager.finance]
manager: NULL
department: [Finance]
job_level: [MNGR]
created_at: '2021-06-03'
updated_at: '2021-06-03'
- model: employee.employee
pk: 2
fields:
user: [team_leader.finance]
manager: [manager.finance]
department: [Finance]
job_level: [LEAD]
created_at: '2021-06-03'
updated_at: '2021-06-03'
,Traceback (most recent call last):
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/db/models/fields/__init__.py",line 1823,in get_prep_value
return int(value)
ValueError: invalid literal for int() with base 10: 'manager.finance'
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/core/serializers/python.py",line 134,in Deserializer
value = base.deserialize_fk_value(field,field_value,using,handle_forward_references)
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/core/serializers/base.py",line 310,in deserialize_fk_value
obj = default_manager.db_manager(using).get_by_natural_key(*field_value)
File "/home/selvaganesh/models/mtest/employee/models.py",line 67,in get_by_natural_key
return self.get(user=user)
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/db/models/manager.py",line 85,in manager_method
return getattr(self.get_queryset(),name)(*args,**kwargs)
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/db/models/query.py",line 424,in get
clone = self._chain() if self.query.combinator else self.filter(*args,line 941,in filter
return self._filter_or_exclude(False,args,kwargs)
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/db/models/query.py",line 961,in _filter_or_exclude
clone._filter_or_exclude_inplace(negate,line 968,in _filter_or_exclude_inplace
self._query.add_q(Q(*args,**kwargs))
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/db/models/sql/query.py",line 1391,in add_q
clause,_ = self._add_q(q_object,self.used_aliases)
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/db/models/sql/query.py",line 1410,in _add_q
child_clause,needed_inner = self.build_filter(
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/db/models/sql/query.py",line 1345,in build_filter
condition = self.build_lookup(lookups,col,value)
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/db/models/sql/query.py",line 1191,in build_lookup
lookup = lookup_class(lhs,rhs)
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/db/models/lookups.py",line 25,in __init__
self.rhs = self.get_prep_lookup()
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/db/models/fields/related_lookups.py",line 117,in get_prep_lookup
self.rhs = target_field.get_prep_value(self.rhs)
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/db/models/fields/__init__.py",line 1825,in get_prep_value
raise e.__class__(
ValueError: Field 'id' expected a number but got 'manager.finance'.
During handling of the above exception,another exception occurred:
Traceback (most recent call last):
File "manage.py",line 22,in <module>
main()
File "manage.py",line 18,in main
execute_from_command_line(sys.argv)
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/core/management/__init__.py",line 419,in execute_from_command_line
utility.execute()
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/core/management/__init__.py",line 413,in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/core/management/base.py",line 354,in run_from_argv
self.execute(*args,**cmd_options)
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/core/management/base.py",line 398,in execute
output = self.handle(*args,**options)
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/core/management/commands/loaddata.py",line 78,in handle
self.loaddata(fixture_labels)
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/core/management/commands/loaddata.py",line 123,in loaddata
self.load_label(fixture_label)
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/core/management/commands/loaddata.py",line 181,in load_label
for obj in objects:
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/core/serializers/pyyaml.py",line 76,in Deserializer
yield from PythonDeserializer(yaml.load(stream,Loader=SafeLoader),**options)
File "/home/selvaganesh/.virtualenvs/mtest/lib/python3.8/site-packages/django/core/serializers/python.py",line 136,in Deserializer
raise base.DeserializationError.WithData(e,d['model'],d.get('pk'),field_value)
django.core.serializers.base.DeserializationError: Problem installing fixture '/home/selvaganesh/models/mtest/employee/fixtures/employee.yaml': Field 'id' expected a number but got 'manager.finance'.: (employee.employee:pk=2) field_value was '['manager.finance']'
字段
示例 2 运行良好
其他外键字段pk: 2、manager、user一切正常
如果我使用 department 工作正常但是如果我使用 job_level 我收到一个错误
如何解决这个问题manager: NULL
请帮帮我
解决方法
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