Django - 在字段值中使用unicode获取对象

Question

在我的Word模型中（使用名为'name'的单个字段），我创建了一个名称包含unicode字符的第一行：

 protected function doRequest($request)
    {
        $headers = array();
        foreach ($request->getServer() as $key => $val) {
            $key = strtolower(str_replace('_', '-', $key));
            $contentHeaders = array('content-length' => true, 'content-md5' => true, 'content-type' => true);
            if (0 === strpos($key, 'http-')) {
                $headers[substr($key, 5)] = $val;
            }
            // CONTENT_* are not prefixed with HTTP_
            elseif (isset($contentHeaders[$key])) {
                $headers[$key] = $val;
            }
        }

        $cookies = CookieJar::fromArray(
            $this->getCookieJar()->allRawValues($request->getUri()),
            parse_url($request->getUri(), PHP_URL_HOST)
        );

        $requestOptions = array(
            'cookies' => $cookies,
            'allow_redirects' => false,
            'auth' => $this->auth,
        );

        if (!in_array($request->getMethod(), array('GET', 'HEAD'))) {
            if (null !== $content = $request->getContent()) {
                $requestOptions['body'] = $content;
            } else {
                if ($files = $request->getFiles()) {
                    $requestOptions['multipart'] = [];

                    $this->addPostFields($request->getParameters(), $requestOptions['multipart']);
                    $this->addPostFiles($files, $requestOptions['multipart']);
                } else {
                    $requestOptions['form_params'] = $request->getParameters();
                }
            }
        }

        if (!empty($headers)) {
            $requestOptions['headers'] = $headers;
        }

        $method = $request->getMethod();
        $uri = $request->getUri();

        foreach ($this->headers as $name => $value) {
            $requestOptions['headers'][$name] = $value;
        }

        // Let BrowserKit handle redirects
            $promise = $this->getClient()->requestAsync($method,$uri,$requestOptions);
            $promise->then(
                function (ResponseInterface $response) {
                    return $this->createResponse($response);

                },
                function (RequestException $e) {
                    $response = $e->getResponse();
                    if (null === $response) {
                        throw $e;
                    }


                }



            );
        $promise->wait();

    }

当我使用name ='a'过滤时，我期待没有结果。这不是正在发生的事情：

In [1:] Word.objects.create(name=u'à')
Out[1:] <Word: à>

相反也是一个问题：当我创建单词'e'并使用name =u'é'过滤时，我会得到'e'字样。

有人有解释吗？

编辑：我正在使用SQL Server。注意：重音字符存储在数据库中。