使用Django为ManyToManyField定义订单

Question

有没有一种方法可以定义通过ManyToManyField相关的对象的顺序？

例：

• ArticleContainer1按此顺序包含：article1，article2，article3，article6

• ArticleContainer2依次包含：article3，article2，article1，article4

• ArticleContainer3按此顺序包含：
  article5
  

这是我的课程：

class Article(models.Model):    
    title = models.CharField(max_length=200)

class ArticleContainer(models.Model):
   contents = models.ManyToManyField(Article, blank=True, null=True)

Answer 1

因此，这是我的一个示例，该站点按部门排序将人员组织到部门中。与问题的概念相同，但模型不同。本示例使用多对多表。

class Department(models.Model):
    slug = models.SlugField(
        verbose_name    = _(u'Slug'),
        help_text           = _(u'Uri identifier for this department.'),
        max_length=255
    )
    name = models.CharField(
        verbose_name    = _(u'Department Name'),
        help_text           = _(u'The department\'s name.'),
        max_length      = 255
    )
    description = models.TextField(
        verbose_name    = _(u'Description'),
        help_text           = _(u'Department\'s description')
    )
    people = models.ManyToManyField(
        Person,
        through             = 'DepartmentPeople',
        related_name    = 'people',
        verbose_name    = _(u'People'),
        help_text           = _(u'People in this Department')
    )
    order_by = models.IntegerField(
        verbose_name    = _(u'Ordering Weight'), 
        help_text           = _(u'This item\'s weight within a list.'),
        max_length      = 255
    )

    class Meta:
        verbose_name = _(u"Department")
        verbose_name_plural = _(u"Departments")
        ordering = ['order_by',]

    def people_list(self):
        return [dp.person for dp in DepartmentPeople.objects.filter(department=self).order_by('order')]

    def __unicode__(self):
        return self.name

通过模型：

class DepartmentPeople(models.Model):
    person = models.ForeignKey(
        Person,
        verbose_name    = _(u'Person'),
        help_text           = _(u'Person is a member of this deparment.'),
    )
    department = models.ForeignKey(
        Department,
        verbose_name    = _(u'Department'),
        help_text           = _(u'Pseron is a member of this department.'),
    )       
    order = models.IntegerField(
        verbose_name    = _(u'Order'),
        help_text           = _(u'What order to display this person within the department.'),
        max_length      = 255
    )

    class Meta:
        verbose_name = _(u"Department Person")
        verbose_name_plural = _(u"Department People")
        ordering = ['order',]

    def __unicode__(self):
        return self.person.first_name + " " + self.person.last_name + " is a member of " + self.department.name + (" in position %d" % self.order)

和管理员：

class DepartmentPeopleInline(admin.TabularInline):
    model = DepartmentPeople
    extra = 1

class DepartmentAdmin(admin.ModelAdmin):
    inlines = (DepartmentPeopleInline,)

admin.site.register(Person, PersonAdmin)
admin.site.register(Department, DepartmentAdmin)

征求意见：

注意：以下是我的PersonAdmin，但在此示例中其不必要地复杂。你可以通过一个简单的

class PersonAdmin(admin.ModelAdmin) :
    pass

但是，这就是我在我的应用程序中使用的：

class PersonForm(forms.ModelForm):
    abstract = forms.CharField(
        widget=TinyMCE(attrs={'cols': 80, 'rows': 30})
    )

    class Meta:
        model = Person

class PersonAdmin(reversion.VersionAdmin):
    form = PersonForm
    # The Form Fieldsets
    fieldsets = [
        (
            None,
            {
                'fields'    : [('first_name', 'last_name', 'post_nominal', ), 'slug', 'title', 'headshot', 'large_photo', ('email', 'phone', ), 'abstract']
            },
        )
    ]

    # Prepopulated fields
    prepopulated_fields = {'slug': ('first_name', 'last_name', 'post_nominal', )}

    # Fields that are readonly
    #readonly_fields = ('slug', )

    def formfield_for_dbfield(self, db_field, **kwargs):
        if db_field.name == 'headshot':
            request = kwargs.pop("request", None)
            kwargs['widget'] = AdminImageWidget
            return db_field.formfield(**kwargs)
        return super(PersonAdmin, self).formfield_for_dbfield(db_field, **kwargs)