Question

models.py

这是经理类

class ProductAttributeManager(models.Manager):
    def all(self):
        return super(ProductAttributeManager , self)
    def type(self):
        return self.all().filter(name__icontains='type')
    def fabric(self):
        return self.all().filter(name__icontains='fabric')

这是模型

class ProductAttribute(models.Model):
    product = models.ForeignKey(Product)
    name = models.CharField(max_length=100)
    Value = models.CharField(max_length=100)

    objects = ProductAttributeManager()

这里是我使用productattribute集来获取属性名称和值并在调用时获取错误的模板

{% for attribute in product.productattribute_set.all %}
<tr><td><strong>{{ attribute.name }}</strong></td><td>{{ attribute.Value }}</td></tr>
{% endfor %}

这里是追溯

File "C:\Python27\lib\site-packages\django\core\handlers\base.py" in get_response
  164.                 response = response.render()
File "C:\Python27\lib\site-packages\django\template\response.py" in render
  158.             self.content = self.rendered_content
File "C:\Python27\lib\site-packages\django\template\response.py" in rendered_content
  135.         content = template.render(context, self._request)
File "C:\Python27\lib\site-packages\django\template\backends\django.py" in render
  74.         return self.template.render(context)
File "C:\Python27\lib\site-packages\django\template\base.py" in render
  209.                     return self._render(context)
File "C:\Python27\lib\site-packages\django\template\base.py" in _render
  201.         return self.nodelist.render(context)
File "C:\Python27\lib\site-packages\django\template\base.py" in render
  903.                 bit = self.render_node(node, context)
File "C:\Python27\lib\site-packages\django\template\debug.py" in render_node
  79.             return node.render(context)
File "C:\Python27\lib\site-packages\django\template\loader_tags.py" in render
  135.         return compiled_parent._render(context)
File "C:\Python27\lib\site-packages\django\template\base.py" in _render
  201.         return self.nodelist.render(context)
File "C:\Python27\lib\site-packages\django\template\base.py" in render
  903.                 bit = self.render_node(node, context)
File "C:\Python27\lib\site-packages\django\template\debug.py" in render_node
  79.             return node.render(context)
File "C:\Python27\lib\site-packages\django\template\loader_tags.py" in render
  65.                 result = block.nodelist.render(context)
File "C:\Python27\lib\site-packages\django\template\base.py" in render
  903.                 bit = self.render_node(node, context)
File "C:\Python27\lib\site-packages\django\template\debug.py" in render_node
  79.             return node.render(context)
File "C:\Python27\lib\site-packages\django\template\defaulttags.py" in render
  161.                 values = list(values)

Exception Type: TypeError at /products/3/
Exception Value: 'super' object is not iterable

我第一次遇到这个问题。为什么超级对象不可迭代？

Answer 1

您的all()方法应该返回一个查询集。例如，你可以做

class ProductAttributeManager(models.Manager):
    def all(self):
        return super(ProductAttributeManager , self).all()

但是，上述方法实际上并未改变行为，因此您只需删除all()方法即可。

'super'对象不可迭代

1 个答案: