我有办法定义内容列表项的顺序吗?
例如:
ArticleContainer1按此顺序包含:
第1条,第2条,第3条,第6条
ArticleContainer2按此顺序包含:
第3条,第2条,第1条,第4条
ArticleContainer3按此顺序包含:
第五条
以下是我的课程:
class Article(models.Model):
title = models.CharField(max_length=200)
class ArticleContainer(models.Model):
contents = models.ManyToManyField(Article, blank=True, null=True)
答案 0 :(得分:22)
所以这是我的一个例子,一个将人们组织成按部门排序的部门的网站。它与您的问题具有相同的概念,但具有不同的模型。此示例使用多对多表格。
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)
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)
注意:以下是我的PersonAdmin,但是对于这个例子来说它是不必要的复杂。你可以用一个简单的
class PersonAdmin(admin.ModelAdmin) :
pass
但这就是我在我的应用中使用的内容:
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)
答案 1 :(得分:12)
请参阅有关through的文档。
答案 2 :(得分:8)
如果您为m2m关系使用明确定义的through
模型,则可以添加自己的属性order-id
。然后,您可以扩展ManyToManyField以根据您在创建/更新时的逻辑填充order-id和模型m2m管理器,该管理器将在您通过order-id属性获取结果时对结果进行排序。
答案 3 :(得分:1)
我使用该插件:https://github.com/jazzband/django-sortedm2m
这样就可以了
我在迁移时遇到了一些麻烦,因为我没有阅读插件的用法,请注意
答案 4 :(得分:0)
在Django 2.0上,accepted answer of Francis Yaconiello可以很好地工作,但由order
类的DepartmentPeople
字段的max_length参数引起的警告除外。
Django会忽略整数字段的max_length,并会在Django 1.8+中警告您。
我将通过添加以下内容使该字段唯一
unique=True
以防止数据输入错误。
答案 5 :(得分:0)
另一种选择:如果您在 ManyToManyField 中只有几个项目,并且您不想引入太多复杂性,您可以选择向 priority
添加一个 ManyToManyField
并定义 {{1 }}在元:
ordering
A class Article(models.Model):
title = models.CharField(max_length=200)
priority = models.PositiveSmallIntegerField(default=16383)
class ArticleContainer(models.Model):
contents = models.ManyToManyField(Article, blank=True, null=True)
class Meta:
ordering = ['priority', 'name']
的范围从 0 到 32767。越接近于零,字段显示的越高。