class Piece(models.Model): article_piece = models.OneToOneField(Piecetrying to add a non-nullable field 'article_piece' to article without a default; we can't do that (the databaseneeds something to populate existing</
我知道从Django 1.7,我不需要使用南方或任何其他迁移系统,所以我只是使用简单的命令python manage.py makemigrationsYou are tryingto add a non-nullable field 'new_field' to userprofile without a default;
we can't do that (the databaseneeds something to populate existing ro
我使用的是laravel 5,在一个模型中,我有一个静态函数,我在控制器中调用它。它工作得很好,但是我想要在这个函数中对另一个非静态函数进行相同的更改,当我在静态函数中调用它时,它会产生错误。Non-static method App\Models\Course::_check_existing_course() should not be called staticallyuse Illuminate\Database\Eloquent\Mode
在我的models.py中,我有: class Profile(models.Model): state = models.CharField(max_length=3)
zip = models.CharFieldYou are trying to add a non-nullable field 'city' to profile without a default; we can&
我正在尝试在我的项目中使用django-orderedmodel ()。You are trying to add a non-nullable field 'order' to slide without a default; we can't do that (the databaseneeds something to populate existing rows).Please select a fix:
1) Provide a one-off default now (will be set on
使用Django的新迁移框架,假设数据库中已经存在以下模型: field_1 = models.CharField(max_length=20)当我试图使用python manage.py makemigrations迁移这个模型时,我得到了以下提示trying to add a non-nullable field 'field_2
This is because the database needs something to populate existing rows.Please select a fix: 2) Quit and manually define a default value in models.py.models</
我有两个他们喜欢的模型类如下:from django.urls import reverse
address = models.CharField(max_length=80)
name = models.CharField(max_lengthare trying to add a non-nullable field 'place_p