如何模板过滤两个不同的模型？

Posted 2023-02-24

【中文标题】如何模板过滤两个不同的模型？

【英文标题】：How can I template filter backwards two different models?

【发布时间】：2019-12-14 08:30:51

【问题描述】：

我有三个模型，“Property”、“Owners”和“ContactsOwner”，最后一个是我保存所有者联系人的地方。

# APP: Owners - models.py
    class Owner(models.Model):
        name = models.CharField(db_column='Owner_Name', max_length=200)
        surname = models.CharField(db_column='Owner_Surname', max_length=30)
        nif = models.IntegerField(db_column='Nif_Number', blank=False, null=False, default='000000000')
        doc_number = models.CharField(db_column='Document_Number', max_length=20, blank=True, null=True)
        doc_type = models.CharField(db_column='Document_Type', max_length=20, blank=True, null=True, choices=DOCUMENT_TYPE_CHOICES)
        address = models.CharField(db_column='Address', max_length=200, blank=True, null=True)
        post_code = models.CharField(db_column='Post_Code', max_length=15, blank=True, null=True)
        nationality = models.CharField(db_column='Country', max_length=20, blank=True, null=True)
        notes = models.CharField(db_column='Notes', max_length=250, blank=True, null=True)
        property = models.ManyToManyField(Property)


        class Meta:
            db_table = 'Owner'

        def __str__(self):
            return self.name

        def get_absolute_url(self):
            return reverse("owners:owner_detail",kwargs='pk':self.pk)

    class ContactsOwner(models.Model):
        owner = models.ForeignKey(Owner, models.DO_NOTHING, db_column='Owner', related_name='owner_contact')  # Field name made lowercase.
        type = models.CharField(db_column='Type', choices=CONTACT_TYPE_CHOICES, max_length=25, blank=True, null=True)  # Field name made lowercase.
        number = models.IntegerField(db_column='Number', blank=True, null=True)  # Field name made lowercase.
        email = models.CharField(db_column='Email', max_length=100, blank=True, null=True)  # Field name made lowercase.

        class Meta:
            db_table = 'Contacts_Owner'
            verbose_name_plural = "Owners Contacts"


# APP: Properties - models.py
class Property(models.Model):
    property_reference = models.CharField(db_column='Property_Reference', max_length=10)  # Field name made lowercase.
    address = models.CharField(db_column='Address', max_length=250, blank=True, null=True)  # Field name made lowercase.
    post_code = models.CharField(db_column='Post_Code', max_length=15, blank=True, null=True)  # Field name made lowercase.
    type = models.CharField(db_column='Type', max_length=25, blank=True, null=True, choices=HOUSE_TYPE_CHOICES)  # Field name made lowercase.
    bedrooms = models.IntegerField(db_column='Bedrooms', blank=True, null=True)  # Field name made lowercase.
    bathrooms = models.IntegerField(db_column='Bathrooms', blank=True, null=True)  # Field name made lowercase.
    usual_cleaning_requirements = models.CharField(db_column='Usual_Cleaning_Requirements', max_length=250, blank=True, null=True)  # Field name made lowercase.
    notes = models.CharField(db_column='Notes', max_length=500, blank=True, null=True)  # Field name made lowercase.
    feature_image = models.ImageField(null=True)

    class Meta:
        db_table = 'Property'

    def __str__(self):
        return self.property_reference

    def get_absolute_url(self):
        return reverse("properties:property_detail",kwargs='pk':self.pk)

在我的模板中，我可以通过此循环访问所有者姓名和姓氏：

% for object in property.owner_set.all %
  <h4> object.name   object.surname </h4>
  <h6>Owner</h6>
% endfor %

但现在我需要访问“ContactsOwner”模型上的联系电话，但我无法找到过滤此信息的方法。

我试过这些：

% for contact in property.owner_set.owner_contact.all %
   <div class="card-body border-top">
       contact.number 
      <br>
   </div>
% endfor %

但到目前为止我还没有找到解决方案。你能帮我解决这个问题吗？

【参考方案1】：

您不能访问相关经理的相关经理，您可以在此处使用双 % for ... % 循环，但这是不可取的：

% for owner in property.owner_set.all %
  % for contact in owner.owner_contact.all %
  <div class="card-body border-top">
     contact.number 
    <br>
  </div>
  % endfor %
% endfor %

最好在视图中执行查询，因为这主要是业务逻辑。您可以通过以下方式检索给定属性的所有 OwnerContacts：

ContactsOwner.objects.filter(<b>owner__property=<i>property</i></b>)

【讨论】：

感谢您的帮助！！我已经创建了这个class PropertyDetailView(DetailView): template_name = 'properties/property-detail.html' model = Property def get_context_data(self, **kwargs): contacts = ContactsOwner.objects.filter(owner__property=property) context = super().get_context_data(**kwargs) context['contact'] = contacts return context 它给了我一个 TypeError: int()... 我找到了一篇帖子，你已经回答了同样的问题，我试过这样做，但它仍然给了我错误。谢谢！

@LuisSilva：你可能应该在这里使用context['property']，所以.filter(owner__property=context['property'])。

我写的“self.object”很糟糕。现在它工作得很好。我做了这些“.filter(owner__property=self.object)”。太感谢了！祝你一切顺利！