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数据库问题
1. 配置问题
raise ImproperlyConfigured('mysqlclient 1.3.7 or newer is required; you have %s.' % Database.__version__)
django.core.exceptions.ImproperlyConfigured: mysqlclient 1.3.7 or newer is required; you have 0.7.10.None.
解决办法：
找到
/home/python/.virtualenvs/py3/lib/python3.5/site-packages/django/db/backends/mysql/base.py的base.py文件将文件中的如下代码注释即可：
if version < (1, 3, 7): raise ImproperlyConfigured('mysqlclient 1.3.7 or newer is required; you have %s.' % Database.__version__)
2. 数据库迁移问题
错误
1. 外键设置默认值
You are trying to add a non-nullable field 'stage' to course without a default; we can't do that (the database needs something to populate existing rows).
Please select a fix:
Provide a one-off default now (will be set on all existing rows with a null value for this column)
Quit, and let me add a default in models.py
Select an option:
解决办法：
设置一个默认值，完成迁移后在模型中删除原来添加的默认值，并且在0001——initial.py中删除默认值
再执行
python manage.py migrate即可成功
2. 数据库迁移时报表已经存在
raise errorclass(errno, errval)
django.db.utils.InternalError: (1050, "Table 'user_operation_coursecomments' already exists")
解决办法：
python manage.py migrate users --fake其中
users是自己的子应用名称或者： 将已经存在的这个表删除，再 migrate即可
3. 查询结果集排序造成的问题
UnorderedObjectListWarning: Pagination may yield inconsistent results with an unordered object_list: <class 'courses.models.Video'> QuerySet.
paginator = self.django_paginator_class(queryset, page_size)
解决办法：
- queryset = Video.objects.all().order_by(‘id’) 将查询结果集排序
- class Meta:
ordering = [’-id’]
加入ordering 排序字段
4. 错误提示如下：
django.db.migrations.exceptions.InconsistentMigrationHistory: Migration user_operation.0001_initial is applied before its dependency sketch.0001_initial on database 'default'.
解决办法：
将之前迁移生成的表全部删掉（有
auth_user表则保留）,再重新开始数据库迁移操作
python manage.py makemigrations
python manage.py migrate大功告成！！！
后续持续更新！！！