问题的原因是原来旧的数据库⽂件和现在执⾏的操作有冲突。解决⽅法是：把migrations⽂件夹内除了__init__.py以外的⽂件删除，重新执⾏makemigrations就可以了 以上这篇解决Django 在ForeignKey中出现 non-nullable field错误的问题就是⼩编分享给⼤家的全部内容了，希望能给⼤家⼀个参考，也希望⼤...
可是在执行makemigrations时,出现“You are trying to add a non-nullable field”的错误,提示我ForeignKey必须有一个default值。但是django里面没有要求ForeignKey必须有一个默认值。 问题的原因是原来旧的数据库文件和现在执行的操作有冲突。 解决方法是:把migrations文件夹内除了__init__.py以外的文件删除,重新执行ma...
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). Please select a fix: 1) Provide a one-off default now (will be set on all existing rows with a null value for this column) ...
1、 https://blog.csdn.net/check2255/article/details/70338443 name = models.CharField(max_length=50) 执行:python manage.py makemirations出现以下错误: 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...
Exception in thread "main" org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 0.0 failed 1 times, most recent failure: Lost task 0.0 in stage 0.0 (TID 0, localhost, executor driver): java.lang.NullPointerException: Null value appeared in non-nullable field...
You are trying to add a non-nullable field 'gender' to interfaces without a default; we can't do that (the database needs something to populate existing rows). Please select a fix: 1) Provide a one-off default now (will be set on all existing rows with a null value for this column...
Version Used: .NET SDK 6.0.201 Visual Studio Community 2022 Ver 17.1.1 Steps to Reproduce: Create a class called Class1 with an int property called Number. Create a class called Class2 with a non-nullable uninitialized Class1 field calle...
java.lang.NullPointerException: Null value appeared in non-nullable field: top level row object If the schema is inferred from a Scala tuple/case class, or a Java bean, please try to use scala.Option[_] or other nullable types (e.g. java.lang.Integer instead of int/scala.Int). ...
integer 代码语言:javascript 复制 You are trying to add a non-nullable field'unique_key'to h1_send_beforeamp without adefault;we can'tdothat(the database needs something to populate existing rows).Please select a fix:1)Provide a one-offdefaultnow(will beseton all existing rowswithanullvaluefo...
执行:python manage.py makemirations出现以下错误: 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). Please select a fix: 1) Provide a one-off default now (will be set on all exi...