arannatao的博客

React初学： Uncaught Error: createRoot(...): Target container is not a DOM element.

一、执行python manage.py makemigrations app时报错：“You are trying to add a non-nullable field 'name' to contact without a default; we can't do that (the database needs something to populate existing rows)"原因：新添加不允许为null、且没有设置defaul的字段时报错。合理，数据库内存量记录需要默认值填充该

在安装redis-trib.rb时需进行Ruby环境准备安装Ruby #在/usr/local目录下 wget https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.1.tar.gz tar xvf ruby-2.3.1.tar.gz cd ruby-2.3.1/ ./configure -prefix=/usr/local/ruby make make install #生成了/usr/local/ruby目录 cd ../ruby