使用 django corsheaders 添加“x-total-count”

Question

如何在我的 django cors 响应标头中添加“x-total-count”？

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'corsheaders',
    'rest_framework',
    'languages'

]

MIDDLEWARE = [
    'corsheaders.middleware.CorsMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

CORS_ALLOW_HEADERS = [
    'x-total-count',
    'accept-encoding',
    'authorization',
    'content-type',
    'dnt',
    'origin',
    'user-agent',
    'x-csrftoken',
    'x-requested-with',


]


CORS_ORIGIN_ALLOW_ALL = True
CORS_ALLOW_CREDENTIALS = True

CORS_ALLOW_METHODS = [
    'DELETE',
    'GET',
    'OPTIONS',
    'PATCH',
    'POST',
    'PUT',
]

。 . .

这就是我的 setting.py 的样子

这是错误的样子：

警告：缺少键的翻译：“X-Total-Count 标头是 HTTP 响应中缺少。 jsonServer 数据提供者期望 包含此标头的资源列表的响应 构建分页的结果总数。如果您正在使用 CORS，您是否在 Access-Control-Expose- 中声明了 X-Total-Count- 标头标头"

即使我查看了许多相关问题，我也无法解决这个问题。 django cors-headers 文档不包含如何添加“x-total-count”的指南

Answer 1

简单的解决方案是https://github.com/bmihelac/ra-data-django-rest-framework 它就像魔术一样工作。希望这有用。

Answer 2

为了使 React Admin 与 Django REST 框架一起工作，我们必须设置一些自定义分页、标题等

例如，这是我对这些文件的实现：

# pagination.py
from collections import OrderedDict
from rest_framework.response import Response
from rest_framework.pagination import PageNumberPagination


class ReactAdminPagination(PageNumberPagination):
    page_query_param = "page"
    page_size_query_param = "perPage"

    def get_paginated_response(self, data):
        count = self.page.paginator.count
        item_starting_index = self.page.start_index() - 1
        item_ending_index = self.page.end_index() - 1

        content_range = "items {0}-{1}/{2}".format(
            item_starting_index, item_ending_index, count
        )

        headers = {"Content-Range": content_range}

        return Response(
            OrderedDict(
                [
                    ("count", count),
                    ("next", self.get_next_link()),
                    ("previous", self.get_previous_link()),
                    ("results", data),
                ]
            ),
            headers=headers,
        )

# filtering.py
import json
from django_filters.rest_framework import DjangoFilterBackend


def sort_queryset(queryset, value):
    try:
        [field, order] = json.loads(value)
    except json.decoder.JSONDecodeError:
        return queryset

    if field and order:
        return queryset.order_by(f"-{field}" if order == "DESC" else field)

    return queryset


def filter_queryset_for_multiple(queryset, key, value):
    filter_params = {}
    filter_params[key] = value.split(",")
    return queryset.filter(**filter_params)


def filter_queryset_for_nullable(queryset, key, value):
    nullable = True if value == "true" else False if value == "false" else None

    if nullable is None:
        return queryset

    filter_params = {}
    filter_params[key] = nullable
    return queryset.filter(**filter_params)


def filter_queryset_for_reference(queryset, key, value):
    f = True if value == "true" else False if value == "false" else value

    filter_params = {}
    filter_params[key] = f
    return queryset.filter(**filter_params)


class ReactAdminFilterBackend(DjangoFilterBackend):
    def get_filterset_kwargs(self, request, queryset, view):
        for key, value in request.query_params.items():
            if key == "sort" and value:
                queryset = sort_queryset(queryset, value)
            elif key.endswith("__in"):
                queryset = filter_queryset_for_multiple(queryset, key, value)
            elif key.endswith("__isnull"):
                queryset = filter_queryset_for_nullable(queryset, key, value)
            elif "__" in key:
                queryset = filter_queryset_for_reference(queryset, key, value)

        return {"data": request.query_params, "queryset": queryset, "request": request}