在django Form中将字段初始化为常量值

Question

如何设置model/form组合，使模型中的字段初始化为固定值，在向用户呈现表单时不显示表单元素？

我只想在每次从表单创建新的 Source 时初始化 Source.updated = datetime.datetime(2000, 1, 1, 0, 0, 0, 0)。用户无法覆盖此初始默认设置。（后续与app交互会导致这个字段值发生变化，但不只是auto_now因为我希望初始值远在过去。）

我现在拥有的是

class Source(Model):
     name = models.CharField(max_length=168, help_text="Source name")
    link = models.URLField(primary_key=True, help_text="Data source link")
    type = models.CharField(max_length=64, help_text="Data source type")
    
     # TODO: add this field to the model.
     # have it initialize to 2000-01-01
    #updated = models.DateTimeField(help_text="Most recent time this source has been updated")

class SourcesForm(forms.ModelForm):

    class Meta:
        model = models.Source
        fields = ['name', 'link', 'type',]
    # TBD: how to configure the form so that
    # it initializes the "updated" field with a fixed value
    # when .save() is called

我试图实现的逻辑是：我们正在从远程源获取数据，所以我想知道最近更新此数据的时间是什么时候。

Answer 1

您可以设置 editable=False [Django-doc] 以防止该字段在 ModelForm、ModelAdmin 等时间出现：

from datetime import datetime

class Source(Model):
    # …
    updated = models.DateTimeField(<strong>editable=False, default=datetime(2000, 1, 1)</strong>, help_text="Most recent time this source has been updated")

在django Form中将字段初始化为常量值

Initialize field to constant value in django Form

python

django

django-models

django-forms