Django：如何根据表单的非持久字段自定义保存 model/form？

Question

我正在重新post问这个问题，因为我在之前 post 中问过 2 in 1。

我想设置 Entry 模型中的字段 publication_date 当布尔值 to_publish 设置为 true，类似于模型中的自定义 save() 方法，但我无法在表单上执行此操作.

#blog/models.py
class Entry(models.Model):
    title = models.CharField(max_length=100)
    body = models.TextField()
    slug = models.SlugField(max_length=100, unique=True)
    creation_date = models.DateTimeField(editable=False)
    publication_date = models.DateTimeField(editable=False, null=True)
    modification_date = models.DateTimeField(editable=False)

    author = models.ForeignKey(User)
    categories = models.ManyToManyField(Category)
    tags = models.ManyToManyField(Tag)

    objects = EntryQuerySet.as_manager()

    def __str__(self):
        return self.title

    def was_published_recently(self):
        now = datetime.datetime.now()
        return now - datetime.timedelta(days=1) <= self.publication_date <= now

    def is_published(self):
        return self.publication_date is not False

    is_published.boolean = True
    is_published.short_description = 'Is it Published?'

    def get_absolute_url(self):
        return reverse("entry_detail", kwargs={"slug": self.slug})

    class Meta():
        verbose_name = "Blog Entry"
        verbose_name_plural = "Blog Entries"
        ordering = ['-creation_date']

    def save(self, *args, **kwargs):
        """ On save, update timestamps """
        if not self.id:
            self.creation_date = datetime.datetime.now()
        self.modification_date = datetime.datetime.now()
        return super(Entry, self).save(*args, **kwargs)

#blog/forms.py
class EntryAdminForm(forms.ModelForm):
    to_publish = forms.BooleanField(required=False)

    class Meta:
        model = Entry
        fields = ['title', 'body', 'slug', 'author', 'categories', 'tags']

#blog/admin.py
class EntryAdmin(MarkdownModelAdmin):
    form = EntryAdminForm
    list_display = ("title", "author", "creation_date", "publication_date", "is_published")
    prepopulated_fields = {"slug": ("title",)}
    formfield_overrides = {TextField: {'widget': AdminMarkdownWidget}}

谢谢。

Answer 1

覆盖 EntryAdmin 的 save_model() 方法：

class EntryAdmin(MarkdownModelAdmin):
    ...
    def save_model(self, request, obj, form, change):
        if form.cleaned_data.get('to_publish'):
            obj.publication_date = datetime.now()
        obj.save()

另一个（更复杂的）选项是覆盖 EntryAdminForm.save() 方法：

class EntryAdminForm(forms.ModelForm):
    ....
    def save(self, *args, **kwargs):
        entry = super(EntryAdminForm, self).save(*args, **kwargs)
        if self.cleaned_data.get('to_publish'):
            entry.publication_date = datetime.now()
            if kwargs.get('commit', True):
                entry.save()
        return entry

Django：如何根据表单的非持久字段自定义保存 model/form？

Django: How to custom save a model/form based on a non-persistent field of a form?

python

django

django-models

django-forms