使用django定义ManyToManyField的顺序 [英] Define an order for ManyToManyField with django

问题描述

我有一种方法来定义内容列表项的顺序？

I there a way to define the order of the contents List items?

例如：

• ArticleContainer1包含以下顺序：
  
  article1，article2，article3，article6

• ArticleContainer1 contains in this order :
  article1, article2, article3, article6

ArticleContainer2包含此订单：

article3，article2，article1，article4

ArticleContainer2 contains in this order :
article3, article2, article1, article4

ArticleContainer3按以下顺序包含：

article5

ArticleContainer3 contains in this order :
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)

推荐答案

p>所以这是一个例子，我有一个网站，将人们组织到部门的部门订购。它与您的问题相同，但具有不同的型号。此示例使用多对多通过表。

So this is an example I have, a site that organizes people into departments with per department ordering. Its the same concept as your problem but with different models. This example uses many-to-many through table.

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        

直通模型：

And the through model:

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)

而管理员：

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

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

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

请求评论：

注意：以下是我的PersonAdmin ，但这个例子不必要地复杂了。你可以通过一个简单的

REQUEST IN COMMENT:

Note: the following is my PersonAdmin, but its needlessly complicated for this example. you could get by with a simple

class PersonAdmin(admin.ModelAdmin) :
    pass

但是这是我在我的应用程序中使用的：

BUT this is what i'm using in my app:

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)

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