Django没有这样的表

Posted 2023-02-24

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【中文标题】Django没有这样的表【英文标题】：Django no such table 【发布时间】：2021-12-10 03:01:01 【问题描述】：

在一个新的 Django 项目的开发环境中，我有 2 个应用程序，我遇到了“无列命名”异常的问题。我最终删除了 sqlite db 并重试了 python manage.py makemigrations 和 pyhon manage.py migrate 现在我遇到了一个没有表退出的新异常。我可以从sqlite模型验证该表没有退出，但是删除数据库后我没有收到任何错误并重新运行python manage.py makemigrations和python manage.py migrate

在我的产品应用程序的 models.py 中

    from django.db import models
    from django.db.models.fields import CharField
    from instructions.models import Instruction
    # Create your models here.
    
    class Product(models.Model):
        productName = models.CharField(max_length=200)
        productDescription = models.TextField(blank=True)
        productPrice = models.DecimalField(max_digits=9, decimal_places=0, default=0)
        productSubQuantity = models.IntegerField(default=1, blank=False)
        productAvailable = models.BooleanField(default = True)
        productCreated_at = models.DateTimeField(auto_now_add = True)
        productUpdated_at = models.DateTimeField(auto_now = True)
        productSlug = models.SlugField(max_length = 255, unique = True,
        help_text = "Unique text for url created from product name")
        productMetaKeywords = models.CharField("Meta keywords for SEO", max_length = 255,
        help_text ="Comma delimited words for SEO")
        productMetaDescription = models.CharField("Meta description", max_length = 255,
        help_text="Content for meta tag description")
        instruction = models.ForeignKey(Instruction, on_delete = models.CASCADE, related_name = "instruction")
    
        class Meta:
            db_table = 'products'
            ordering = ['-productName']
    
        def __str__(self):
            return self.productName
    
    class Image(models.Model):
        image = models.ImageField()
        imageMetaKeyWords = models.CharField("Meta keywords for SEO", max_length = 255,
        help_text = "Comma delimited words for SEO")
        imageMetaDescription = models.CharField("Meta description", max_length = 255,
        help_text = "Content for image meta tag description")
        defaultImage = models.BooleanField(default= False)
        product = models.ForeignKey(Product, on_delete=models.CASCADE, related_name="images")

在指令应用中的 models.py 中

from django.db import models

# Create your models here.
class Instruction(models.Model):
    instructionName = models.CharField(max_length=200)
    instructionEstimatedPreparationTime = models.IntegerField(default = 0)
    instructionContent = models.TextField(blank = False)
    instructionVideoFilePath = models.FileField(blank = True, null = True)
    instructionVideoQRcode = models.CharField(max_length=1000, blank = True, null = True)

在settings.py中

"""
Django settings for dimsumbox project.

Generated by 'django-admin startproject' using Django 3.2.8.

For more information on this file, see
https://docs.djangoproject.com/en/3.2/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/3.2/ref/settings/
"""

from pathlib import Path

# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/3.2/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'django-insecure-)4we8*9#lmu^+(x%k+&thxt8t0f=*m^f8h5xfba9wiwc6r2@ze'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = []


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'products',
    'instructions'
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'dimsumbox.urls'

TEMPLATES = [
    
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,
        'OPTIONS': 
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        ,
    ,
]

WSGI_APPLICATION = 'dimsumbox.wsgi.application'


# Database
# https://docs.djangoproject.com/en/3.2/ref/settings/#databases

DATABASES = 
    'default': 
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': BASE_DIR / 'db.sqlite3',
    



# Password validation
# https://docs.djangoproject.com/en/3.2/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    ,
    
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    ,
    
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    ,
    
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    ,
]


# Internationalization
# https://docs.djangoproject.com/en/3.2/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, javascript, Images)
# https://docs.djangoproject.com/en/3.2/howto/static-files/

STATIC_URL = '/static/'

# Default primary key field type
# https://docs.djangoproject.com/en/3.2/ref/settings/#default-auto-field

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

当我从管理员输入产品时输出错误

Internal Server Error: /admin/products/product/
Traceback (most recent call last):
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/backends/sqlite3/base.py", line 423, in execute
    return Database.Cursor.execute(self, query, params)
sqlite3.OperationalError: no such table: products

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/contrib/admin/options.py", line 616, in wrapper
    return self.admin_site.admin_view(view)(*args, **kwargs)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/utils/decorators.py", line 130, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/contrib/admin/sites.py", line 232, in inner
    return view(request, *args, **kwargs)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/utils/decorators.py", line 43, in _wrapper
    return bound_method(*args, **kwargs)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/utils/decorators.py", line 130, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/contrib/admin/options.py", line 1697, in changelist_view
    cl = self.get_changelist_instance(request)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/contrib/admin/options.py", line 736, in get_changelist_instance
    return ChangeList(
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/contrib/admin/views/main.py", line 100, in __init__
    self.get_results(request)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/contrib/admin/views/main.py", line 235, in get_results
    result_count = paginator.count
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/utils/functional.py", line 48, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/core/paginator.py", line 97, in count
    return c()
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/models/query.py", line 412, in count
    return self.query.get_count(using=self.db)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/models/sql/query.py", line 519, in get_count
    number = obj.get_aggregation(using, ['__count'])['__count']
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/models/sql/query.py", line 504, in get_aggregation
    result = compiler.execute_sql(SINGLE)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/models/sql/compiler.py", line 1175, in execute_sql
    cursor.execute(sql, params)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/backends/utils.py", line 98, in execute
    return super().execute(sql, params)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/backends/utils.py", line 66, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/backends/utils.py", line 75, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/backends/utils.py", line 79, in _execute
    with self.db.wrap_database_errors:
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/utils.py", line 90, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/backends/sqlite3/base.py", line 423, in execute
(env) jianxiongwu@Jians-MacBook-Pro dimsumbox % python manage.py runserver
Watching for file changes with StatReloader
Performing system checks...

System check identified no issues (0 silenced).
October 24, 2021 - 06:09:35
Django version 3.2.8, using settings 'dimsumbox.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
[24/Oct/2021 06:09:40] "GET / HTTP/1.1" 200 10697
[24/Oct/2021 06:09:43] "GET /admin/ HTTP/1.1" 200 5130
[24/Oct/2021 06:09:44] "GET /admin/ HTTP/1.1" 200 5130
Internal Server Error: /admin/products/product/
Traceback (most recent call last):
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/backends/sqlite3/base.py", line 423, in execute
    return Database.Cursor.execute(self, query, params)
sqlite3.OperationalError: no such table: products

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/contrib/admin/options.py", line 616, in wrapper
    return self.admin_site.admin_view(view)(*args, **kwargs)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/utils/decorators.py", line 130, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/contrib/admin/sites.py", line 232, in inner
    return view(request, *args, **kwargs)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/utils/decorators.py", line 43, in _wrapper
    return bound_method(*args, **kwargs)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/utils/decorators.py", line 130, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/contrib/admin/options.py", line 1697, in changelist_view
    cl = self.get_changelist_instance(request)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/contrib/admin/options.py", line 736, in get_changelist_instance
    return ChangeList(
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/contrib/admin/views/main.py", line 100, in __init__
    self.get_results(request)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/contrib/admin/views/main.py", line 235, in get_results
    result_count = paginator.count
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/utils/functional.py", line 48, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/core/paginator.py", line 97, in count
    return c()
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/models/query.py", line 412, in count
    return self.query.get_count(using=self.db)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/models/sql/query.py", line 519, in get_count
    number = obj.get_aggregation(using, ['__count'])['__count']
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/models/sql/query.py", line 504, in get_aggregation
    result = compiler.execute_sql(SINGLE)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/models/sql/compiler.py", line 1175, in execute_sql
    cursor.execute(sql, params)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/backends/utils.py", line 98, in execute
    return super().execute(sql, params)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/backends/utils.py", line 66, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/backends/utils.py", line 75, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/backends/utils.py", line 79, in _execute
    with self.db.wrap_database_errors:
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/utils.py", line 90, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "/Users/jianxiongwu/Documents/Python/Github/DimsumBox_website/env/lib/python3.10/site-packages/django/db/backends/sqlite3/base.py", line 423, in execute
    return Database.Cursor.execute(self, query, params)
django.db.utils.OperationalError: no such table: products
[24/Oct/2021 06:09:46] "GET /admin/products/product/ HTTP/1.1" 500 170815

【问题讨论】：

试试python manage.py makemigrations app 和python manage.py migrate app 还有你的应用名称是什么？我认为您在settings.py 文件中添加了型号名称而不是应用名称。这行得通！为什么不能像我一开始那样运行 python manage.py makemigrations？你能写一个答案来结束这个问题吗？能否更新views.py文件，以便我们更清楚地调试。我还没有在views.py中写任何东西。它仅适用于管理员视图。 【参考方案1】：

正如 Sunil Ghimire python manage.py makemigrations app 和 python manage.py migrate app 所建议的那样，由于一些奇怪的原因，我还不明白 python manage.py makemigrations 和 python manage.py migrate 单独没有应用程序不起作用。

【讨论】：

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