Question

嘿，我已经浏览过这里的一些simliar帖子，但是没有发现任何解决了我的问题。我有以下型号，

from django.db import models

class Areas(models.Model):

    name =  models.CharField(max_length = 120)
    order_in_sidebar_network = models.IntegerField(blank=True, null=True)
    order_in_section_network = models.IntegerField(blank=True, null=True)


    def __unicode__ (self):
        return self.area_name

    class Meta:
        verbose_name_plural = "Areas"
        verbose_name = "Area"

class Countries(models.Model):
    name = models.CharField(max_length = 120, help_text = "The name of the country")
    area = models.ForeignKey(Areas, verbose_name = 'Area')

    def __unicode__ (self):
        return self.name

    class Meta:
        verbose_name_plural = "Countries"
        verbose_name = "Country"
        ordering = ['name']



class Offices(models.Model):
    country = models.ForeignKey(Countries, verbose_name = 'Country')
    name = models.CharField(max_length = 255, help_text = "The name of this office, IE London")
    main_office = models.BooleanField(default= False, help_text = "Is this office a key location?", verbose_name = "Key Location")
    address_1 = models.CharField(max_length = 255, null = True, blank = True)
    address_2 = models.CharField(max_length = 255, null = True, blank = True)
    address_3 = models.CharField(max_length = 255, null = True, blank = True)
    city = models.CharField(max_length = 255, null = True, blank = True)
    postcode = models.CharField(max_length = 20)
    tel = models.CharField(max_length = 30, null= True, blank = True, help_text = "Optional telephone contact number")
    mobile = models.CharField(max_length = 30, null= True, blank = True, help_text = "Optional mobile contact number")
    fax = models.CharField(max_length = 30, null= True, blank = True, help_text = "Optional fax contact number")
    data_1 = models.CharField(max_length = 255, null = True, blank = True, help_text = "Optional additional data", verbose_name = "Additional information")
    data_2 = models.CharField(max_length = 255, null = True, blank = True, help_text = "Optional additional data", verbose_name = "Additional information")

    class Meta:
        verbose_name_plural = "Offices"
        verbose_name = "Office"
        ordering = ['name']

    def __unicode__(self):
        return self.name

class OfficeMembers(models.Model):
    name = models.CharField(max_length = 60, help_text = "Please tell us this person name")
    title = models.CharField(max_length = 100, help_text = "The person's title, IE Managing Director")
    email = models.EmailField(max_length = 255, null = True, blank = True, help_text = "Optional email address for this person")
    email2 = models.EmailField(max_length = 255, null = True, blank = True, help_text = "Optional second email address for this person")
    phone = models.CharField(max_length = 30, null = True, blank  = True, help_text = "Optional contact number for this person")
    mobile = models.CharField(max_length = 30, null = True, blank  = True, help_text = "Optional mobile contact number for this person")
    office = models.ForeignKey(Offices, null = True)
    class Meta:
        verbose_name_plural = "Office Memebers"
        verbose_name = "Office memebr"
        ordering = ['name']

    def __unicode__(self):
        return self.name

我有以下视图设置

def index(request):

    cache_key = "world_areas"
    cache_time = 60

    world_areas_cache = cache.get(cache_key)

    #if no cache is set, grab the objects, and set the cache

    logger.debug(world_areas)
    if not world_areas_cache:
        logger.info('No cache found grabbing objects')
        world_areas = Areas.objects.select_related().all()
        #cache.set(cache_key, world_areas, cache_time)
        logger.debug(world_areas)
    else:
        logger.info("Getting from cache")
        world_areas = world_areas_cache

    return render_to_response('network/index.html', {'world_areas':world_areas}, context_instance=RequestContext(request))

尝试迭代world_areas对象，如此

{% for area in world_areas %}

产生模板语法错误

'RelatedManager'对象不可迭代

任何人都知道为什么会这样？真的似乎无法绕过这个！ strangley这对我来说很有用：S我错过了一些明显的东西???

非常感谢能够提供帮助的任何人！

Answer 1

Call all()从经理处检索元素。

{% for area in world_areas.all %}

Answer 2

通常，最好使用values或values_list将数据从查询集传递到模板。

world_areas = Areas.objects.select_related().all().values_list('name', 'order_in_sidebar_network', ...)

如果您之前没有使用values功能，请查看Django docs以获取有关如何使用{{1}}功能的信息。

Answer 3

我是因为一个鲁莽的错误而遇到这个问题：

 for physicalserver in task.physicalservers:
        physicalserver.relieve_task()

task.physicalservers是RelatedManager对象，在我的情况下我应该得到任务的物理服务器，应该添加.all()。

for physicalserver in task.physicalservers.all():

'RelatedManager'对象不是可迭代的Django

3 个答案: