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django - 如何修复“设置”对象没有属性“CASSANDRA_FALLBACK_ORDER_BY_PYTHON”

问题描述

我在 django 项目中设置 cassandra 引擎，我成功运行了服务器，但是当我在管理站点中单击 myapp 模型时出现错误：

Settings' object has no attribute 'CASSANDRA_FALLBACK_ORDER_BY_PYTHON

我首先同步 cassandra 然后迁移它，之后我运行服务器没有错误，但是在管理站点中，当我想将数据放入我的模型时出现此错误

For database I use django_cassandra_engine 

DATABASES = {
    'default': {
        'ENGINE': 'django_cassandra_engine',
        'NAME': 'db',
        'TEST_NAME': 'Test Cluster',
        'HOST': '127.0.0.1 ',
        'POST': '9042',
        'OPTIONS': {
            'replication': {
                'strategy_class': 'SimpleStrategy',
                'replication_factor': 1
            },
            'connection': {
                'consistency': ConsistencyLevel.LOCAL_ONE,
                'retry_connect': True
                # + All connection options for cassandra.cluster.Cluster()
            },
            'session': {
                'default_timeout': 10,
                'default_fetch_size': 10000
                # + All options for cassandra.cluster.Session()
            }
        }
}

我有这样的模型：

from cassandra.cqlengine import columns
from django_cassandra_engine.models import DjangoCassandraModel

class mymodel(DjangoCassandraModel):
    name = columns.Text(required=True)
    phone = columns.Integer(primary_key=True)

in my terminal i get 

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/dist-packages/django_cassandra_engine/models/__init__.py", line 745, in order_by
    *self._get_ordering_condition(col))
  File "/usr/local/lib/python3.7/dist-packages/cassandra/cqlengine/query.py", line 1133, in _get_ordering_condition
    raise QueryException("Can't resolve the column name: '{0}'".format(colname))
cassandra.cqlengine.query.QueryException: Can't resolve the column name: 'pk'


  File "/usr/local/lib/python3.7/dist-packages/django/conf/__init__.py", line 80, in __getattr__
    val = getattr(self._wrapped, name)
AttributeError: 'Settings' object has no attribute 'CASSANDRA_FALLBACK_ORDER_BY_PYTHON'

我也将rest_framework用于api视图如何解决此类问题

标签： django

解决方案

将以下内容添加到您的设置中：

CASSANDRA_FALLBACK_ORDER_BY_PYTHON = True

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