我们有一个Django应用程序,其中包含报纸文章列表。每篇文章与“发言人”以及“公司”(文章中提到的公司)都有m2m关系。
目前,用于创建新文章的添加文章页面非常接近我们想要的 - 它只是Django Admin的库存,我们使用filter_horizontal来设置两个m2m关系。
下一步是在每个m2m关系中添加一个“评级”字段作为中间字段。
所以,我们的models.py
的一个例子class Article(models.Model):
title = models.CharField(max_length=100)
publication_date = models.DateField()
entry_date = models.DateField(auto_now_add=True)
abstract = models.TextField() # Can we restrict this to 450 characters?
category = models.ForeignKey(Category)
subject = models.ForeignKey(Subject)
weekly_summary = models.BooleanField(help_text = 'Should this article be included in the weekly summary?')
source_publication = models.ForeignKey(Publication)
page_number = models.CharField(max_length=30)
article_softcopy = models.FileField(upload_to='article_scans', null=True, blank=True, help_text='Optionally upload a soft-copy (scan) of the article.')
url = models.URLField(null=True, blank=True, help_text = 'Enter a URL for the article. Include the protocl (e.g. http)')
firm = models.ManyToManyField(Firm, null=True, blank=True, through='FirmRating')
spokesperson = models.ManyToManyField(Spokeperson, null=True, blank=True, through='SpokespersonRating')
def __unicode__(self):
return self.title
class Firm(models.Model):
name = models.CharField(max_length=50, unique=True)
homepage = models.URLField(verify_exists=False, help_text='Enter the homepage of the firm. Include the protocol (e.g. http)')
def __unicode__(self):
return self.name
class Meta:
ordering = ['name']
class Spokeperson(models.Model):
title = models.CharField(max_length=100)
first_name = models.CharField(max_length=50)
last_name = models.CharField(max_length=50)
def __unicode__(self):
return self.first_name + ' ' + self.last_name
class Meta:
ordering = ['last_name', 'first_name']
class FirmRating(models.Model):
firm = models.ForeignKey(Firm)
article = models.ForeignKey(Article)
rating = models.IntegerField()
class SpokespersonRating(models.Model):
firm = models.ForeignKey(Spokesperson)
article = models.ForeignKey(Article)
rating = models.IntegerField()
这里的问题是,一旦我们将我们的公司和发言人字段更改为“通过”并使用中介,我们的添加文章页面就不再具有filter_horizontal控件来向文章添加Firms / Spokeperson关系 - 它们完全消失。你根本看不到它们。我不知道为什么会这样。
我希望有一些方法可以继续使用酷的filter_horizontal小部件来设置关系,并且不知何故只是在其下面嵌入另一个字段来设置评级。但是,我不知道如何在继续利用Django管理员的同时做到这一点。
我在这里看到一篇关于在Django admin中覆盖单个小部件的文章:
http://www.fictitiousnonsense.com/archives/22
但是,我不确定该方法是否仍然有效,而且我不确定是否将它应用于此处,将FK应用于中间模型(它基本上是内联的?)。
当然有一种简单的方法可以做到这一切吗?
干杯, 维克多
答案 0 :(得分:8)
问题是formfield_for_manytomany
中管理员的方法django.contrib.admin.options
没有返回带有中间模型的多个字段的表单字段! http://code.djangoproject.com/browser/django/trunk/django/contrib/admin/options.py#L157
您必须在ModelAdmin中覆盖此方法:
def formfield_for_manytomany(self, db_field, request=None, **kwargs):
"""
Get a form Field for a ManyToManyField.
"""
# If it uses an intermediary model that isn't auto created, don't show
# a field in admin.
if not db_field.rel.through._meta.auto_created:
return None # return something suitable for your needs here!
db = kwargs.get('using')
if db_field.name in self.raw_id_fields:
kwargs['widget'] = widgets.ManyToManyRawIdWidget(db_field.rel, using=db)
kwargs['help_text'] = ''
elif db_field.name in (list(self.filter_vertical) + list(self.filter_horizontal)):
kwargs['widget'] = widgets.FilteredSelectMultiple(db_field.verbose_name, (db_field.name in self.filter_vertical))