Django执行makemigrations命令报错：Passenger模型参数异常

正在学习CS50课程，此前Airport与Flights模型可正常运行，新增Passenger模型后执行python manage.py makemigrations命令失败，报错提示TypeError: __init__() got an unexpected keyword argument 'max_lenght'。

我的models.py代码 #

from django.db import models

class Airport(models.Model):
    city=models.CharField(max_length=64)
    code=models.CharField(max_length=3)

    def __str__(self):
        return f"{self.city} ({self.code})"

# Create your models here.
class Flights(models.Model):
    origin=models.ForeignKey(Airport , on_delete= models.CASCADE , related_name="departures")
    destination=models.ForeignKey(Airport , on_delete=models.CASCADE , related_name="arrivals")
    duration=models.IntegerField()

    def __str__(self):
        return f" {self.origin} to {self.destination} : {self.duration}"
    
class Passenger(models.Model):
    first=models.CharField(max_length=24)
    last=models.CharField(max_lenght=24)
    flight=models.ManyToManyField(Flights , blank=True , related_name="passengers")

    def __str__(self):
        return f"{self.first} {self.last}"

完整报错堆栈 #

$ python manage.py makemigrations
Traceback (most recent call last):
  File "D:\practice\airlines\manage.py", line 22, in <module>
    main()
  File "D:\practice\airlines\manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "C:\Users\faisa\AppData\Local\Programs\Python\Python39\lib\site-packages\django\core\management\__init__.py", line 442, in execute_from_command_line
    utility.execute()
  File "C:\Users\faisa\AppData\Local\Programs\Python\Python39\lib\site-packages\django\core\management\__init__.py", line 416, in execute
    django.setup()
  File "C:\Users\faisa\AppData\Local\Programs\Python\Python39\lib\site-packages\django\__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "C:\Users\faisa\AppData\Local\Programs\Python\Python39\lib\site-packages\django\apps\registry.py", line 116, in populate
    app_config.import_models()
  File "C:\Users\faisa\AppData\Local\Programs\Python\Python39\lib\site-packages\django\apps\config.py", line 269, in import_models
    self.models_module = import_module(models_module_name)
  File "C:\Users\faisa\AppData\Local\Programs\Python\Python39\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 850, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "D:\practice\airlines\flights\models.py", line 19, in <module>
    class Passenger(models.Model):
  File "D:\practice\airlines\flights\models.py", line 21, in Passenger
    last=models.CharField(max_lenght=24)
  File "C:\Users\faisa\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\fields\__init__.py", line 1139, in __init__
    super().__init__(*args, **kwargs)
TypeError: __init__() got an unexpected keyword argument 'max_lenght'

问题解决 #

报错原因是拼写错误：Passenger模型中last=models.CharField(max_lenght=24)里的参数名max_lenght拼写错误，正确写法应为max_length（注意是length而非lenght）。

修正后的Passenger模型代码：

class Passenger(models.Model):
    first=models.CharField(max_length=24)
    last=models.CharField(max_length=24)
    flight=models.ManyToManyField(Flights , blank=True , related_name="passengers")

    def __str__(self):
        return f"{self.first} {self.last}"

修正后重新执行python manage.py makemigrations和python manage.py migrate命令即可完成数据库迁移。

内容的提问来源于stack exchange，提问作者Mohammed Faisal Khan