小编Nat*_*han的帖子

url== http://127.0.0.1:8000/posts/
D:\Priyanka_Angular1\virtual_env\django-angular\lib\site-packages\rest_framework\views.py 中的错误在调度中

            response = self.handle_exception(exc)

 ...

? 本地变量 D:\Priyanka_Angular1\virtual_env\django-angular\lib\site-packages\rest_framework\views.py in handle_exception

            self.raise_uncaught_exception(exc)

 ...

? 调度中的本地变量 D:\Priyanka_Angular1\virtual_env\django-angular\lib\site-packages\rest_framework\views.py

            response = handler(request, *args, **kwargs)

 ...

? 本地变量 D:\Priyanka_Angular1\virtual_env\django-angular\lib\site-packages\rest_framework\generics.py 在 get

        return self.list(request, *args, **kwargs)

 ...

? 本地变量 D:\Priyanka_Angular1\virtual_env\django-angular\lib\site-packages\rest_framework\mixins.py 在列表中

        queryset = self.filter_queryset(self.get_queryset())

 ...

? get_queryset 中的本地变量 D:\Priyanka_Angular1\virtual_env\django-angular\lib\site-packages\rest_framework\generics.py

            % self.__class__.__name__

序列化程序.py

from rest_framework import serializers
from posts.models import Post

class PostSerializer(serializers.HyperlinkedModelSerializer):
    author = serializers.Field(source='author.username')
    api_url = serializers.SerializerMethodField('get_api_url')

    class Meta:
        model = Post
        fields = ('id', 'title', 'description', 'created_on', 'author', 'url', 'api_url')
        read_only_fields …

我首先进行了category增删改查，然后进行了product与 的多对多关系的增删改查category。
models.py( category):

class Category(models.Model):
    name = models.CharField(max_length=191, blank=False, null=False)
    description = models.TextField(blank=True, null=True)

models.py( product):

class Product(models.Model):
    product_code = models.CharField(max_length=191, blank=False, null=False)
    name = models.CharField(max_length=191, blank=False, null=False)
    description = models.TextField(blank=False, null=False)
    price = models.DecimalField(max_digits=19, decimal_places=2)
    photo = models.ImageField(upload_to='pictures/products/', max_length=255, null=False, blank=False)
    category = models.name = models.ManyToManyField(Category)

如何达到以下结果：

  {
        "categories": [
            {
                "id": 1,
                "name": "Indoor Muscle Training",
                "description": null,
                "products":{
                       "name":"product_name",
                       "code":"product_code"
                }
            },
            {
                "id": 2,
                "name": …

我正在使用 tf 2.0 和 tensorboard 2.0。我想在 jupyter notebook 中使用 tb 但出现错误：

错误：无法启动 TensorBoard（以 -6 退出）。stderr 的内容：[libprotobuf ERROR external/com_google_protobuf/src/google/protobuf/descriptor_database.cc:393] 传递给 EncodedDescriptorDatabase::Add() 的文件描述符数据无效。[libprotobuf FATAL external/com_google_protobuf/src/google/protobuf/descriptor.cc:1367] CHECK failed: GeneratedDatabase()->Add(encoded_file_descriptor, size): libc++abi.dylib: 以未捕获的类型 google:: 异常终止protobuf::FatalException: 检查失败: GeneratedDatabase()->Add(encoded_file_descriptor, size):

我想ProductImageSerializer在可浏览的 API 中显示。但我收到了这个错误：

UnicodeDecodeError at /api/product_images/
'utf-8' codec can't decode byte 0xff in position 0: invalid start byte
Unicode 错误提示
无法编码/解码的字符串是： ??????

这是我的models.py：

class ProductImage(models.Model):
    product = models.ForeignKey(Product, on_delete=models.CASCADE)
    image = models.ImageField(upload_to='product_images', width_field=None, height_field=None,
                              max_length=250)
    default = models.BooleanField(verbose_name='Default Picture', default=False)

    def __str__(self):
        return '%s - %s' % (self.product.product_id, self.default)

这是我的serializers.py：

class ProductImageSerializer(serializers.ModelSerializer):
    product = serializers.PrimaryKeyRelatedField(many=False, queryset=Product.objects.all())

    class Meta:
        model = ProductImage
        fields = ['id', 'product', 'image', 'default']

    def to_representation(self, instance):
        if self.context['request'].method == 'GET': …

我有两个模型，Contact并且User：

class Contact(models.Model):
    name = models.CharField(max_length=50, blank=True)
    status = models.BooleanField(default=False)

class User(models.Model):
    username = models.CharField(max_length=50, blank=True)
    password = models.CharField(max_length=50, blank=True)
    contact_id = models.ForeignKey(Contact, on_delete=models.CASCADE, blank=True, null=True)

对于这两个模型，我有两个序列化器类：

class ContactSerializerModel(serializers.ModelSerializer):
    class Meta:
        model = Contact
        fields = ('name', 'status')

class UserSerializerModel(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ('username', 'password','contact_id')

我想设计一个串行类需要name，username，password，和status领域。我想将它们作为键值对发布。第一name和status值保存在Contact模型然后用Contact模型id保存username，并password在User表中。如何在 Django rest …