我有两个模型Order并Orderitem
Order收集客户信息并跟踪客户订单的状态。
class Order(SmartModel):
#each individual status
SUBMITTED = 1 # the credit card was valid or mobilemoney was recieved.It is ready for us to process the order
PROCESSED = 2 # After submitted orders are reviewed, we can mark them as processed, letting deliverers know order is ready to be shipped
DELIVERED = 3 # the order has been processed and approved by the adminstrator(in this case us), it can delivered.
CANCELLED = 4 # Customer called the company and decided they didnt want to go through with the order either by phone or email.
# SET OF POSSIBLE STATUSES
ORDER_STATUSES = ((SUBMITTED,'Submitted'),(PROCESSED,'Processed'),(DELIVERED,'Delivered'),(CANCELLED,'Cancelled'),)
#Order info
date = models.DateTimeField(auto_now_add=True)
status = models.IntegerField(choices=ORDER_STATUSES, default=SUBMITTED)
last_updated = models.DateTimeField(auto_now=True)
# transaction_id = models.CharField(max_length=20)
#contact info
email = models.EmailField(max_length=50)
phone = PhoneNumberField(max_length=20,default='+250785559899')
#delivery information
delivery_name = models.CharField(max_length=50)
delivery_city = models.CharField(max_length = 50)
delivery_address = models.CharField(max_length=50,help_text="e.g Klab 6th floor,Telecomhouse,Kacyiru")
restaurant = models.ForeignKey(Restaurant,default='1')
OrderItem另一方面持有物品和数量
class OrderItem(SmartModel):
shopping_id = models.CharField(max_length=50,db_index=True)
quantity = models.IntegerField(default=0)
item = models.ForeignKey(Item)
order = models.ForeignKey(Order)
我正在创建这样的模型。
try:
order= Order.objects.get(pk=order_id)
restaurant = Restaurant.objects.get(pk=restaurant_id)
except:
order = Order(created_by=anon_user,modified_by=anon_user)
order.save()
oi=OrderItem(order=order,shopping_id=_shopping_id(request),
quantity=quantity,
item=i,
created_by=anon_user,
modified_by=anon_user)
oi.save()
现在，您看到OrderItem我包含了一个外键order，这是因为我希望能够拥有一个模型，其中包含一个订单项目、它的数量和Order详细信息。但这不起作用我得到一个无类型错误，coercing to Unicode: need string or buffer, NoneType found.
我需要帮助来了解我如何才能完成这项工作。
Traceback:
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
136. response = response.render()
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/response.py" in render
104. self._set_content(self.rendered_content)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/response.py" in rendered_content
81. content = template.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/base.py" in render
140. return self._render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/test/utils.py" in instrumented_test_render
62. return self.nodelist.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/base.py" in render
823. bit = self.render_node(node, context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
74. return node.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
123. return compiled_parent._render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/test/utils.py" in instrumented_test_render
62. return self.nodelist.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/base.py" in render
823. bit = self.render_node(node, context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
74. return node.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
123. return compiled_parent._render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/test/utils.py" in instrumented_test_render
62. return self.nodelist.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/base.py" in render
823. bit = self.render_node(node, context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
74. return node.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
123. return compiled_parent._render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/test/utils.py" in instrumented_test_render
62. return self.nodelist.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/base.py" in render
823. bit = self.render_node(node, context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
74. return node.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
123. return compiled_parent._render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/test/utils.py" in instrumented_test_render
62. return self.nodelist.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/base.py" in render
823. bit = self.render_node(node, context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
74. return node.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
62. result = block.nodelist.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/base.py" in render
823. bit = self.render_node(node, context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
74. return node.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
62. result = block.nodelist.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/base.py" in render
823. bit = self.render_node(node, context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
74. return node.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
62. result = block.nodelist.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/base.py" in render
823. bit = self.render_node(node, context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
74. return node.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
62. result = block.nodelist.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/base.py" in render
823. bit = self.render_node(node, context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
74. return node.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/defaulttags.py" in render
185. nodelist.append(node.render(context))
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/base.py" in render
1202. return self.nodelist.render(new_context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/base.py" in render
823. bit = self.render_node(node, context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
74. return node.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/defaulttags.py" in render
476. output = self.nodelist.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/base.py" in render
823. bit = self.render_node(node, context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
74. return node.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/defaulttags.py" in render
281. return nodelist.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/base.py" in render
823. bit = self.render_node(node, context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
74. return node.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/defaulttags.py" in render
281. return nodelist.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/base.py" in render
823. bit = self.render_node(node, context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
74. return node.render(context)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/template/debug.py" in render
87. output = force_unicode(output)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/utils/encoding.py" in force_unicode
71. s = unicode(s)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/forms/forms.py" in __unicode__
411. return self.as_widget()
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/forms/forms.py" in as_widget
458. return widget.render(name, self.value(), attrs=attrs)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/forms/widgets.py" in render
547. options = self.render_options(choices, [value])
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/forms/widgets.py" in render_options
570. for option_value, option_label in chain(self.choices, choices):
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/forms/models.py" in __iter__
897. yield self.choice(obj)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/forms/models.py" in choice
903. return (self.field.prepare_value(obj), self.field.label_from_instance(obj))
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/forms/models.py" in label_from_instance
954. return smart_unicode(obj)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/utils/encoding.py" in smart_unicode
39. return force_unicode(s, encoding, strings_only, errors)
File "/home/mats-invasion/projects/f4l/env/local/lib/python2.7/site-packages/django/utils/encoding.py" in force_unicode
71. s = unicode(s)
Exception Type: TypeError at /incoming_orders/orderitem/create/
Exception Value: coercing to Unicode: need string or buffer, NoneType found