MongoLab通过CURL/Golang HTTP使用HTTP PUT删除多个集合无效

Question

我试图删除多个文档在我的MongoDb数据库中的集合托管在MongoLab服务通过他们的HTTP接口。这是我在尝试实现它时使用的CURL请求

 curl -H "Content-Type: application/json" -X PUT  "https://api.mongolab.com/api/1/databases/mydb/collections/mycoll?q={\"person\":\"554b3d1ae4b0e2832aeeb6af\"}&apiKey=xxxxxxxxxxxxxxxxx"

我基本上希望从集合中删除所有具有匹配查询的文档。蒙古医生http://docs.mongolab.com/restapi/#view-edit delete document建议“在正文中指定空列表相当于删除与查询匹配的文档。” 。但我如何在PUT请求体中发送空列表？

下面是我用来实现上述PUT请求的Golang代码

client := &http.Client{}
postRequestToBeSentToMongoLab, err := http.NewRequest("PUT","https://api.mongolab.com/api/1/databases/mydb/collections/mycoll?q={\"person\":\"554b3d1ae4b0e2832aeeb6af\"}&apiKey=xxxxxxxxxxxxxxxxx",nil )
postRequestToBeSentToMongoLab.Header.Set("Content-Type", "application/json") //http://stackoverflow.com/questions/24455147/go-lang-how-send-json-string-in-post-request
responseFromMongoLab, err := client.Do(postRequestToBeSentToMongoLab)

在这两种情况下，它都返回null（Golang和CURL的PUT请求的情况）。如何让这个工作，以便它删除所有匹配查询的文档？




Answer 1

我想您需要传递一个空json数组作为PUT消息的有效负载。有了卷曲，它会是这样的：

curl -H "Content-Type: application/json" -X PUT -d '[]' "https://api.mongolab.com/api/1/databases/mydb/collections/mycoll?q={\"person\":\"554b3d1ae4b0e2832aeeb6af\"}&apiKey=xxxxxxxxxxxxxxxxx"

在Go代码中，您需要编写如下内容：

client := &http.Client{}
req, err := http.NewRequest(
    "PUT",
    "https://api.mongolab.com/api/1/databases/mydb/collections/mycoll?q={\"person\":\"554b3d1ae4b0e2832aeeb6af\"}&apiKey=xxxxxxxxxxxxxxxxx",
     bytes.NewBuffer("[]")
)
req.Header.Set("Content-Type", "application/json")
reply, err := client.Do(req)