Question

我想编写一个视图，将某些模型字段值重置为默认值。如何获取默认模型字段值？

UIStoryboard *mainStoryboard = [UIStoryboard  storyboardWithName:@"main" bundle:nil];
UIViewController *loginViewController = [mainStoryboard instantiateViewControllerWithIdentifier:@"loginViewController"];
UIViewController *lastPresentedViewController =  [[[UIApplication sharedApplication] keyWindow] rootViewController];

while (lastPresentedViewController.presentedViewController) {
    lastPresentedViewController = lastPresentedViewController.presentedViewController;
}

[lastPresentedViewController presentViewController:loginViewController animated:true completion:nil];

所以我想要的是：

class Foo(models.Model):
    bar_field = models.CharField(blank=True, default='bar')

Answer 1

自Django 1.10起：myfield = Foo._meta.get_field('bar_field').get_default()

请参阅此处（文档中未详细说明......）：https://github.com/django/django/blob/master/django/db/models/fields/init.py#L2301

Answer 2

myfield = Foo._meta.get_field_by_name('bar_field')

，默认只是字段的一个属性：

myfield.default

django获取默认模型字段值

2 个答案: