小编use*_*508的帖子

我正在定义一组模型,它们相互引用.它们是文档应用程序的模型,如下所示

class Document(models.Model):
    text = models.TextField()

class Chapter(models.Model):
    doc = models.ForeignKey('Document')
    chapter = models.IntegerField()

我希望整个字段对于每个文档都是唯一的,但我不知道如何这样做.我知道每个字段都有一个唯一的参数,但它似乎对整个表都是唯一的,这不是我想要的.

我想知道如何让mongoengine和djangoREST框架相互合作.目前,我的模型是

from mongoengine import *
import datetime

class Blog(Document):
    post_id = IntField(unique=True)
    title = StringField(max_length=144, required=True)
    date_created = DateTimeField(default=datetime.datetime.now)
    body = StringField(required=True)

我将序列化程序定义为

from rest_framework.views import APIView
from rest_framework.response import Response
from .models import *

class BlogList(APIView):
    """
    Lists all blog posts, or creates a new post
    """
    def get(self, request, format=None):
        posts = Blog.objects.to_json()
        return Response(posts)

但是我收到了错误

TypeError at /blog/

__init__() takes exactly 1 argument (2 given)

Request Method:     GET
Request URL:    http://127.0.0.1:8000/blog/
Django Version:     1.5.1
Exception Type:     TypeError …

如果我有两个序列化程序,其中一个是嵌套的,我该如何设置restore_object方法？例如,如果我定义了以下序列化程序,如何为嵌套序列化程序定义还原对象字段？从文档中可以看出如何处理这种情况并不明显.

class UserSerializer(serializers.Serializer):
    first_name = serializers.CharField(required=True, max_length=30)
    last_name = serializers.CharField(required=True, max_length=30)
    username = serializers.CharField(required=True, max_length=30)
    email = serializers.EmailField(required=True)
    password = serializers.CharField(required=True)

    def restore_object(self, attrs, instance=None):
        if instance:
            instance.first_name = attrs.get('first_name', instance.first_name)
            instance.last_name = attrs.get('last_name', instance.last_name)
            instance.email = attrs.get('email', instance.email)
            instance.password = attrs.get('password', instance.password)

class UserProfileSerializer(serializers.Serializer):
    user = UserSerializer()
    bio = serializers.CharField()
    def restore_object(self, attrs, instance=None):
        if instance:
            instance.bio = attrs.get('bio', instance.bio)
            instance.user = ?????

我有一个控制器和工厂定义如下.

myApp.controller('ListController', 
        function($scope, ListFactory) {
    $scope.posts = ListFactory.get();
    console.log($scope.posts);
});

myApp.factory('ListFactory', function($http) {
    return {
        get: function() {
            $http.get('http://example.com/list').then(function(response) {
                if (response.data.error) {
                    return null;
                }
                else {
                    console.log(response.data);
                    return response.data;
                }
            });
        }
    };
});

令我困惑的是,我从控制器获取未定义的输出,然后控制台输出的下一行是我工厂中的对象列表.我也尝试过将控制器更改为

myApp.controller('ListController', 
        function($scope, ListFactory) {
    ListFactory.get().then(function(data) {
        $scope.posts = data;
    });
    console.log($scope.posts);
});

但我收到错误

TypeError: Cannot call method 'then' of undefined

注意:我通过http://www.benlesh.com/2013/02/angularjs-creating-service-with-http.html找到了有关使用工厂的信息.

我在python 3.3中导入Process时收到以下错误.有什么理由我会得到这样的错误,还是这个错误？我在另一个终端窗口运行django服务器,但我怀疑这与此有什么关系.

Python 3.3.2 (default, Nov  8 2013, 13:38:57) 
[GCC 4.8.2 20131017 (Red Hat 4.8.2-1)] on linux
Type "help", "copyright", "credits" or "license" for more information.
# extension module loaded from '/usr/lib64/python3.3/lib-dynload/readline.cpython-33m.so'
import 'readline' # <_frozen_importlib.ExtensionFileLoader object at 0x7f8a00fc1050>
>>> from multiprocessing import Process
# ./__pycache__/multiprocessing.cpython-33.pyc matches ./multiprocessing.py
# code object from ./__pycache__/multiprocessing.cpython-33.pyc
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<frozen importlib._bootstrap>", line 1567, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1534, in _find_and_load_unlocked
  File "<frozen …

我已经定义了一个用户配置文件模型,但希望有一个api端点将所有用户数据保存到两个模型中.我的意思是,我使用的是用户模型,我的userprofile模型定义如下

class UserProfile(models.Model):
    user = models.OneToOneField(settings.AUTH_USER_MODEL)
    biography = models.TextField()

当我定义一个用于创建新用户的序列化程序时,如何让它将数据序列化为用户模型和userProfile模型？

如何用一定数量的有效数字表示C中的极大或极小数字.例如,如果我想在1.54334E-34上进行计算,我该怎么做呢.此外,这适用于OpenCL代码吗？

参考这个问题:

node.js是否有类似收音机的音频流解决方案？

是否有任何烧瓶模块可以帮助构建HTML5音频的流媒体服务器？

我有一个对象定义如下

class a():
    @property
    def prop(self):
        print("hello from object.prop")
        @property
        def prop1(self):
            print("Hello from object.prop.prop")

我打电话的时候

>>> obj = a()
>>> obj.prop
hello from object.prop
>>> obj.prop.prop

我收到以下回溯错误

Traceback (most recent call last):
  File "object_property.py", line 13, in <module>
    a.prop.prop1
AttributeError: 'NoneType' object has no attribute 'prop1'

我想弄清楚的是我是否可以为对象定义嵌套属性？

我有一个需要多处理的脚本.我从这个脚本中发现的是多处理模块存在问题.为了测试这个理论,我复制并粘贴了

from multiprocessing import Process

def f(name):
    print('hello', name)

if __name__ == '__main__':
    p = Process(target=f, args=('bob',))
    p.start()
    p.join()

进入测试脚本并收到以下回溯

Traceback (most recent call last):
  File "a.py", line 1, in <module>
    from multiprocessing import Process
  File "/usr/lib64/python3.3/multiprocessing/__init__.py", line 40, in <module>
    from multiprocessing.util import SUBDEBUG, SUBWARNING
  File "/usr/lib64/python3.3/multiprocessing/util.py", line 16, in <module>
    import threading        # we want threading to install it's
  File "/usr/lib64/python3.3/threading.py", line 11, in <module>
    from traceback import format_exc as _format_exc
  File "/usr/lib64/python3.3/traceback.py", line 3, in <module>
    import …