带有pycharm的apache-cassandra数据库的Django

问题描述

我正在尝试使用pycharm和apache-cassandra作为数据库，使用Django框架使用数据库模型创建消息应用程序。当我尝试跑步

python manage.py migrate

在终端中，我收到以下错误消息，

TypeError：sync_cassandra命令的未知选项：app_label，check_unapplied，fake，fake_initial，交互式，migration_name，plan，run_syncdb。有效选项包括：数据库，force_color，help，no_color，pythonpath，设置，skip_checks，stderr，stdout，回溯，详细程度，版本。

我的setting.py

"""
Django settings for DjangoProject project.

Generated by 'django-admin startproject' using Django 3.1.

For more information on this file,see
https://docs.djangoproject.com/en/3.1/topics/settings/

For the full list of settings and their values,see
https://docs.djangoproject.com/en/3.1/ref/settings/
"""
import os
from pathlib import Path
from cassandra import ConsistencyLevel

# Build paths inside the project like this: BASE_DIR / 'subdir'.
from cassandra.cqlengine.connection import session

BASE_DIR = Path(__file__).resolve(strict=True).parent.parent

# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/3.1/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 's6+mmj8j^9qe+jy&=@^2i!cao!fnxeicaa24c^@se8n@o88t&r'

# 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','posts.apps.PostsConfig',]
INSTALLED_APPS = ['django_cassandra_engine'] + INSTALLED_APPS

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 = 'DjangoProject.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates','DIRS': [os.path.join(BASE_DIR,'templates')],'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 = 'DjangoProject.wsgi.application'

# Database
# https://docs.djangoproject.com/en/3.1/ref/settings/#databases


DATABASES = {
    'sqlite': {
        'ENGINE': 'django.db.backends.sqlite3','NAME': BASE_DIR / 'db.sqlite3','default': {
        'ENGINE': 'django_cassandra_engine','NAME': 'my_keyspace','TEST_NAME': 'MasterTable','HOST': '127.0.0.1','OPTIONS': {
            'replication': {
                'strategy_class': 'SimpleStrategy','replication_factor': 1
            },'connection': {
                'consistency': ConsistencyLevel.SERIAL,'retry_connect': True
                # + All connection options for cassandra.cluster.Cluster()
            },'session': {
                'default_timeout': 10,'default_fetch_size': 10000
                # + All options for cassandra.cluster.Session()
            }
        }
    }
}

# Password validation
# https://docs.djangoproject.com/en/3.1/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/3.1/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/3.1/howto/static-files/

STATIC_URL = '/static/'

但是，当我使用sqlite3进行迁移时，我没有任何错误。

解决方法

可能您已经知道了。

答案是Cassandra不必迁移，而是sync_cassandra。

尝试： python manage.py sync_cassandra