Django遍历具有unique_together并且没有pk的对象集
[英]Django Iterating through an object set with unique_together and no pk
问题描述
我试图遍历传递给for模板标记的对象集。
# Views.py
@staff_member_required
def index(request):
order_list = OrderInfo.objects.all()
attribs = OrderInfo._meta.fields
content_list = Content.objects.all()
return render(request, 'orders/index.html', {'order_list': order_list, 'attribs': attribs, 'content_list': content_list})
但是，Content的模型有一个unique_together pk，所以我不能给它提供ID pk。
# orders/Models.py
class OrderInfo(models.Model):
order_id = models.AutoField(primary_key=True, unique=True)
agent_id = models.ForeignKey(Agent, db_column='agent_id', null=False, blank=False, default=2)
customer_id = models.ForeignKey(Customer, db_column='customer_id', null=False, blank=False, default=4)
issue_date = models.DateField(blank=False, null=False, default='2017-01-01')
issue_time = models.TimeField(blank=False, null=False)
delivery_date = models.DateField(blank=False, null=False, default='2017-01-01')
delivery_time = models.TimeField(blank=False, null=False)
def __str__(self):
return str(self.order_id)
class Meta:
app_label = 'orders'
db_table = 'orderinfo'
class Content(models.Model):
content_id = models.AutoField(primary_key=True, unique=True)
order_id = models.ForeignKey(OrderInfo, db_column='order_id')
product_id = models.ForeignKey(Product, db_column='product_id')
personalization = models.CharField(max_length=255, blank=False, null=False, default='')
quantity_ordered = models.PositiveIntegerField(blank=False, null=False, default=1)
discount = models.FloatField(blank=False, null=False, default=0.00)
def __str__(self):
return str(self.order_id + "|" + self.product_id)
class Meta:
app_label = 'orders'
db_table = 'content'
unique_together = (('order_id', 'product_id'),)
还有产品
# catalog/models.py
class Product(models.Model):
product_id = models.AutoField(primary_key=True)
name = models.CharField(max_length=255, blank=False, null=False, default='Swiffer')
color = models.CharField(choices=COLOR_CHOICES, max_length=255, blank=False, null=False, default='red')
quantity_stocked = models.PositiveIntegerField(blank=False, null=False, default=1)
personalization_limit = models.IntegerField(blank=False, null=False, default=8)
price = models.FloatField(blank=False, null=False, default=20.00)
def __str__(self):
return str(self.product_id)
class Meta:
app_label = 'catalog'
db_table = 'product'
由于Content没有ID pk，因此在传递上下文并尝试遍历上下文时出现错误：
OperationalError at /orders/
(1054, "Unknown column 'content.id' in 'field list'")
html代码是：
<!DOCTYPE html>
<html>
<head>
<title>Orders</title>
<style>
table, th, td {
border: 1px solid black;
}
</style>
</head>
<body>
{% extends 'del3/base.html' %}
{% block content %}
<h1>Order List</h1>
<table>
<tr>
{% for attrib in attribs|slice:":3" %}
<th>{{attrib.name}}</th>
{% endfor %}
<th>recipient</th>
{% for attrib in attribs|slice:"3:" %}
<th>{{attrib.name}}</th>
{% endfor %}
<th>summary</th>
</tr>
{% for order in order_list %}
<tr>
<td>{{order.order_id}}</td>
<td>{{order.agent_id}}</td>
<td>{{order.recipient_id}}</td>
<td>{{order.recipient_id.first_name}} {{order.recipient_id.last_name}}</td>
<td>{{order.issue_date}}</td>
<td>{{order.issue_time}}</td>
<td>{{order.delivery_date}}</td>
<td>{{order.delivery_time}}</td>
<td>Agent {{order.agent_id}} {{order.agent_id.first_name}} in charge of Order {{order.order_id}} sent to Recipient {{order.recipient_id}} {{order.recipient_id.first_name}}</td>
</tr>
{% endfor %}
</table>
<h1>Order Contents</h1>
<table>
<tr>
<th>order id</th>
<th>product id</th>
<th>name</th>
<th>color</th>
<th>personalization</th>
<th>quantity ordered</th>
<th>discount</th>
</tr>
{% for content in content_list %}
<tr>
<td>{{content.order_id}}</td>
<td>{{content.product_id}}</td>
<td>{{content.product_id.name}}</td>
<td>{{content.product_id.color}}</td>
<td>{{content.personalization}}</td>
<td>{{content.quantity_ordered}}</td>
<td>{{content.discount}}</td>
{% endfor %}
</table>
{% endblock %}
</body>
</html>
我知道这里的错误是Content没有ID（如果我正确的话，Django需要遍历某些内容），但是由于unique_together已经是PK，因此我无法为Content提供ID。 有没有办法解决这个问题或解决它？ 还是我只是想念一些东西？
谢谢！
编辑：堆栈跟踪（对不起，这是我第一次询问Django！）环境：
Request Method: GET
Request URL: http://127.0.0.1:8000/orders/
Django Version: 1.8.8
Python Version: 3.6.1
Installed Applications:
('django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'agents',
'catalog',
'del3',
'customers',
'orders')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'django.middleware.security.SecurityMiddleware')
Template error:
In template C:\Users\Gab De Jesus\Desktop\Mega\CS122Del3\del3\orders\templates\orders\index.html, error at line 52
1054
42 : <table>
43 : <tr>
44 : <th>order id</th>
45 : <th>product id</th>
46 : <th>name</th>
47 : <th>color</th>
48 : <th>personalization</th>
49 : <th>quantity ordered</th>
50 : <th>discount</th>
51 : </tr>
52 : {% for content in content_list %}
53 : <tr>
54 : <td>{{content.order_id}}</td>
55 : <td>{{content.product_id}}</td>
56 : <td>{{content.product_id.name}}</td>
57 : <td>{{content.product_id.color}}</td>
58 : <td>{{content.personalization}}</td>
59 : <td>{{content.quantity_ordered}}</td>
60 : <td>{{content.discount}}</td>
61 : {% endfor %}
62 : </table>
Traceback:
File "C:\Anaconda3\envs\django\lib\site-packages\django\core\handlers\base.py" in get_response
132. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Anaconda3\envs\django\lib\site-packages\django\contrib\auth\decorators.py" in _wrapped_view
22. return view_func(request, *args, **kwargs)
File "C:\Users\Gab De Jesus\Desktop\Mega\CS122Del3\del3\orders\views.py" in index
12. return render(request, 'orders/index.html', {'order_list': order_list, 'attribs': attribs, 'content_list': content_list})
File "C:\Anaconda3\envs\django\lib\site-packages\django\shortcuts.py" in render
67. template_name, context, request=request, using=using)
File "C:\Anaconda3\envs\django\lib\site-packages\django\template\loader.py" in render_to_string
99. return template.render(context, request)
File "C:\Anaconda3\envs\django\lib\site-packages\django\template\backends\django.py" in render
74. return self.template.render(context)
File "C:\Anaconda3\envs\django\lib\site-packages\django\template\base.py" in render
210. return self._render(context)
File "C:\Anaconda3\envs\django\lib\site-packages\django\template\base.py" in _render
202. return self.nodelist.render(context)
File "C:\Anaconda3\envs\django\lib\site-packages\django\template\base.py" in render
905. bit = self.render_node(node, context)
File "C:\Anaconda3\envs\django\lib\site-packages\django\template\debug.py" in render_node
79. return node.render(context)
File "C:\Anaconda3\envs\django\lib\site-packages\django\template\loader_tags.py" in render
135. return compiled_parent._render(context)
File "C:\Anaconda3\envs\django\lib\site-packages\django\template\base.py" in _render
202. return self.nodelist.render(context)
File "C:\Anaconda3\envs\django\lib\site-packages\django\template\base.py" in render
905. bit = self.render_node(node, context)
File "C:\Anaconda3\envs\django\lib\site-packages\django\template\debug.py" in render_node
79. return node.render(context)
File "C:\Anaconda3\envs\django\lib\site-packages\django\template\loader_tags.py" in render
65. result = block.nodelist.render(context)
File "C:\Anaconda3\envs\django\lib\site-packages\django\template\base.py" in render
905. bit = self.render_node(node, context)
File "C:\Anaconda3\envs\django\lib\site-packages\django\template\debug.py" in render_node
79. return node.render(context)
File "C:\Anaconda3\envs\django\lib\site-packages\django\template\defaulttags.py" in render
162. len_values = len(values)
File "C:\Anaconda3\envs\django\lib\site-packages\django\db\models\query.py" in __len__
144. self._fetch_all()
File "C:\Anaconda3\envs\django\lib\site-packages\django\db\models\query.py" in _fetch_all
965. self._result_cache = list(self.iterator())
File "C:\Anaconda3\envs\django\lib\site-packages\django\db\models\query.py" in iterator
238. results = compiler.execute_sql()
File "C:\Anaconda3\envs\django\lib\site-packages\django\db\models\sql\compiler.py" in execute_sql
840. cursor.execute(sql, params)
File "C:\Anaconda3\envs\django\lib\site-packages\django\db\backends\utils.py" in execute
79. return super(CursorDebugWrapper, self).execute(sql, params)
File "C:\Anaconda3\envs\django\lib\site-packages\django\db\backends\utils.py" in execute
64. return self.cursor.execute(sql, params)
File "C:\Anaconda3\envs\django\lib\site-packages\django\db\utils.py" in __exit__
98. six.reraise(dj_exc_type, dj_exc_value, traceback)
File "C:\Anaconda3\envs\django\lib\site-packages\django\utils\six.py" in reraise
685. raise value.with_traceback(tb)
File "C:\Anaconda3\envs\django\lib\site-packages\django\db\backends\utils.py" in execute
64. return self.cursor.execute(sql, params)
File "C:\Anaconda3\envs\django\lib\site-packages\django\db\backends\mysql\base.py" in execute
124. return self.cursor.execute(query, args)
File "C:\Anaconda3\envs\django\lib\site-packages\MySQLdb\cursors.py" in execute
250. self.errorhandler(self, exc, value)
File "C:\Anaconda3\envs\django\lib\site-packages\MySQLdb\connections.py" in defaulterrorhandler
50. raise errorvalue
File "C:\Anaconda3\envs\django\lib\site-packages\MySQLdb\cursors.py" in execute
247. res = self._query(query)
File "C:\Anaconda3\envs\django\lib\site-packages\MySQLdb\cursors.py" in _query
411. rowcount = self._do_query(q)
File "C:\Anaconda3\envs\django\lib\site-packages\MySQLdb\cursors.py" in _do_query
374. db.query(q)
File "C:\Anaconda3\envs\django\lib\site-packages\MySQLdb\connections.py" in query
292. _mysql.connection.query(self, query)
Exception Type: OperationalError at /orders/
Exception Value: (1054, "Unknown column 'content.id' in 'field list'")
1 个解决方案
解决方案1
0 2017-05-03 15:53:23
查看回溯电话
OperationalError at /orders/
(1054, "Unknown column 'content.id' in 'field list'")
我想您已经尝试从您在模型中设置的content实例获取id字段，而不是content_id字段。
从文档：
如果您想指定自定义主键，只需在其中一个字段上指定primary_key = True即可。 如果Django看到您已显式设置Field.primary_key，则不会添加自动ID列。
所以，你已经覆盖了content.id与content.content_id 。
您不再具有id字段，因为您已将primary_key=True为content_id字段。
尝试将id替换为content_id 。 就像是：
{{ content.content_id }}
编辑：好的，您编辑了帖子。.现在我可以看到问题了。
实际上，这是一个MySQL错误。
您可以检查： Django模型（1054，““字段列表”中的未知列”）
为 Django 模型的所有字段设置 unique_together 的最佳方法
[英]Best way to set unique_together for all fields of a django model
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