Models

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from django.db import models
from django.db import models

In [2]:

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class Aluno(models.Model):
    nome = models.CharField(max_length=100)
    matricula = models.CharField(max_length=10, unique=True)
    idade = models.PositiveIntegerField()
    curso = models.CharField(max_length=100)
    data_matricula = models.DateField()

    def __str__(self):
        return f"{self.nome}"
class Aluno(models.Model):
    nome = models.CharField(max_length=100)
    matricula = models.CharField(max_length=10, unique=True)
    idade = models.PositiveIntegerField()
    curso = models.CharField(max_length=100)
    data_matricula = models.DateField()

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

---------------------------------------------------------------------------
ImproperlyConfigured                      Traceback (most recent call last)
Cell In[2], line 1
----> 1 class Aluno(models.Model):
      2     nome = models.CharField(max_length=100)
      3     matricula = models.CharField(max_length=10, unique=True)

File c:\Users\00661711722\Documents\PBE_24.2_8002\.venv\Lib\site-packages\django\db\models\base.py:129, in ModelBase.__new__(cls, name, bases, attrs, **kwargs)
    126 app_label = None
    128 # Look for an application configuration to attach the model to.
--> 129 app_config = apps.get_containing_app_config(module)
    131 if getattr(meta, "app_label", None) is None:
    132     if app_config is None:

File c:\Users\00661711722\Documents\PBE_24.2_8002\.venv\Lib\site-packages\django\apps\registry.py:260, in Apps.get_containing_app_config(self, object_name)
    251 def get_containing_app_config(self, object_name):
    252     """
    253     Look for an app config containing a given object.
    254 
   (...)
    258     Return None if the object isn't in any registered app config.
    259     """
--> 260     self.check_apps_ready()
    261     candidates = []
    262     for app_config in self.app_configs.values():

File c:\Users\00661711722\Documents\PBE_24.2_8002\.venv\Lib\site-packages\django\apps\registry.py:137, in Apps.check_apps_ready(self)
    132 from django.conf import settings
    134 # If "not ready" is due to unconfigured settings, accessing
    135 # INSTALLED_APPS raises a more helpful ImproperlyConfigured
    136 # exception.
--> 137 settings.INSTALLED_APPS
    138 raise AppRegistryNotReady("Apps aren't loaded yet.")

File c:\Users\00661711722\Documents\PBE_24.2_8002\.venv\Lib\site-packages\django\conf\__init__.py:81, in LazySettings.__getattr__(self, name)
     79 """Return the value of a setting and cache it in self.__dict__."""
     80 if (_wrapped := self._wrapped) is empty:
---> 81     self._setup(name)
     82     _wrapped = self._wrapped
     83 val = getattr(_wrapped, name)

File c:\Users\00661711722\Documents\PBE_24.2_8002\.venv\Lib\site-packages\django\conf\__init__.py:61, in LazySettings._setup(self, name)
     59 if not settings_module:
     60     desc = ("setting %s" % name) if name else "settings"
---> 61     raise ImproperlyConfigured(
     62         "Requested %s, but settings are not configured. "
     63         "You must either define the environment variable %s "
     64         "or call settings.configure() before accessing settings."
     65         % (desc, ENVIRONMENT_VARIABLE)
     66     )
     68 self._wrapped = Settings(settings_module)

ImproperlyConfigured: Requested setting INSTALLED_APPS, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.

In [3]:

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class Department(models.Model):
    name = models.CharField(max_length=100)

    def __str__(self):
        return self.name
class Department(models.Model):
    name = models.CharField(max_length=100)

    def __str__(self):
        return self.name

---------------------------------------------------------------------------
ImproperlyConfigured                      Traceback (most recent call last)
Cell In[3], line 1
----> 1 class Department(models.Model):
      2     name = models.CharField(max_length=100)
      4     def __str__(self):

File c:\Users\00661711722\Documents\PBE_24.2_8002\.venv\Lib\site-packages\django\db\models\base.py:129, in ModelBase.__new__(cls, name, bases, attrs, **kwargs)
    126 app_label = None
    128 # Look for an application configuration to attach the model to.
--> 129 app_config = apps.get_containing_app_config(module)
    131 if getattr(meta, "app_label", None) is None:
    132     if app_config is None:

File c:\Users\00661711722\Documents\PBE_24.2_8002\.venv\Lib\site-packages\django\apps\registry.py:260, in Apps.get_containing_app_config(self, object_name)
    251 def get_containing_app_config(self, object_name):
    252     """
    253     Look for an app config containing a given object.
    254 
   (...)
    258     Return None if the object isn't in any registered app config.
    259     """
--> 260     self.check_apps_ready()
    261     candidates = []
    262     for app_config in self.app_configs.values():

File c:\Users\00661711722\Documents\PBE_24.2_8002\.venv\Lib\site-packages\django\apps\registry.py:137, in Apps.check_apps_ready(self)
    132 from django.conf import settings
    134 # If "not ready" is due to unconfigured settings, accessing
    135 # INSTALLED_APPS raises a more helpful ImproperlyConfigured
    136 # exception.
--> 137 settings.INSTALLED_APPS
    138 raise AppRegistryNotReady("Apps aren't loaded yet.")

File c:\Users\00661711722\Documents\PBE_24.2_8002\.venv\Lib\site-packages\django\conf\__init__.py:81, in LazySettings.__getattr__(self, name)
     79 """Return the value of a setting and cache it in self.__dict__."""
     80 if (_wrapped := self._wrapped) is empty:
---> 81     self._setup(name)
     82     _wrapped = self._wrapped
     83 val = getattr(_wrapped, name)

File c:\Users\00661711722\Documents\PBE_24.2_8002\.venv\Lib\site-packages\django\conf\__init__.py:61, in LazySettings._setup(self, name)
     59 if not settings_module:
     60     desc = ("setting %s" % name) if name else "settings"
---> 61     raise ImproperlyConfigured(
     62         "Requested %s, but settings are not configured. "
     63         "You must either define the environment variable %s "
     64         "or call settings.configure() before accessing settings."
     65         % (desc, ENVIRONMENT_VARIABLE)
     66     )
     68 self._wrapped = Settings(settings_module)

ImproperlyConfigured: Requested setting INSTALLED_APPS, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.

In [4]:

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class Employee(models.Model):
    name = models.CharField(max_length=100)
    role = models.CharField(max_length=100)
    department = models.ForeignKey(Department, on_delete=models.CASCADE)

    def __str__(self):
        return self.name
class Employee(models.Model):
    name = models.CharField(max_length=100)
    role = models.CharField(max_length=100)
    department = models.ForeignKey(Department, on_delete=models.CASCADE)

    def __str__(self):
        return self.name

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
Cell In[4], line 1
----> 1 class Employee(models.Model):
      2     name = models.CharField(max_length=100)
      3     role = models.CharField(max_length=100)

Cell In[4], line 4, in Employee()
      2 name = models.CharField(max_length=100)
      3 role = models.CharField(max_length=100)
----> 4 department = models.ForeignKey(Department, on_delete=models.CASCADE)
      6 def __str__(self):
      7     return self.name

NameError: name 'Department' is not defined