[英]Go-MongoDriver decoding JSON array weirdly
Heyho party people,嘿嘿党的人,
I've recently took up learning Go and started working on a small side project which includes a API written using the Go Fiber library.我最近开始学习 Go 并开始从事一个小型项目,其中包括使用 Go Fiber 库编写的 API。 All the necessery data is stored in MongoDB with the following schema所有必需的数据都存储在 MongoDB 中,其架构如下
{
"ObjectId": {
"name": "name",
"url": "url",
"dateAdded": "date",
"data": [{
"timestamp 1": "price 1"
},
{
"timestamp 2": "price 2"
}
]
}
}
The item type looks like this:项目类型如下所示:
type Item struct {
ID primitive.ObjectID `json:"_id" bson:"_id"`
Name string `json:"name" bson:"name"`
URL string `json:"url" bson:"url"`
DateAdded string `json:"dateAdded" bson:"dateAdded"`
Data []interface{} `json:"data" bson:"data"`
}
Whenever I query a stored item with每当我查询存储的项目时
err = collection.FindOne(context.TODO(), filter).Decode(&item)
each map inside of the data-array is wrapped in another array =>数据阵列内部的每个 map 都包装在另一个阵列中 =>
{ test url 2021-04-16 [[{2021-04-16 99.99}] [{2021-04-17 109.99}]] }
instead of
{ test url 2021-04-16 [{2021-04-16 99.99}, {2021-04-17 109.99}] }
Does anybody have an idea on how to fix this?有人知道如何解决这个问题吗? Thanks in advance!提前致谢!
OK, I've found a way to fix this behaviour for my use case.好的,我找到了一种方法来解决我的用例的这种行为。
As mentioned above, the MongoDB-driver for Go wraps each entry of an array into another respective array, which leads to a nested array.如上所述,Go 的 MongoDB 驱动程序将数组的每个条目包装到另一个相应的数组中,这导致嵌套数组。
After trying around for some time I found out, that inserting the document into your collection like the following example,在尝试了一段时间后,我发现将文档插入到您的集合中,如下例所示,
db.collection.insertOne({ name: "Name", url: "URL", dateAdded: "2021-04-25", data: { "2021-04-25": 9.99, "2021-04-26": 19.99 } })
then the result of a query performed in your program looks like this:那么在您的程序中执行的查询结果如下所示:
{ ObjectID("60858245f8805dc57a716500") Name URL 2021-04-25 [{ 2021-04-25 9.99 } { 2021-04-26 19.99 }] }
This means, that the JSON-schema should look like this这意味着,JSON 模式应该是这样的
{
"ObjectId": {
"name": "name",
"url": "url",
"dateAdded": "date",
"data": {
"2021-04-25": 9.99,
"2021-04-26": 19.99
}
}
}
Sadly, I was not able to find out what is actually causing this odd behaviour, but I hope this helps anybody encountering this (or a similar) problem.遗憾的是,我无法找出导致这种奇怪行为的真正原因,但我希望这可以帮助遇到这个(或类似)问题的任何人。
Changing the type of the Data
-field to []bson.M
, as mkopriva said in the comments below, fixed it.正如mkopriva在下面的评论中所说,将Data
-field 的类型更改为[]bson.M
,修复了它。
type Item struct {
ID primitive.ObjectID `json:"_id" bson:"_id"`
Name string `json:"name" bson:"name"`
URL string `json:"url" bson:"url"`
DateAdded string `json:"dateAdded" bson:"dateAdded"`
Data []bson.M `json:"data" bson:"data"`
}
This way the original JSON-schema does not have to be adapted to the workaround.这样,原始 JSON 模式就不必适应解决方法。
{
"ObjectId":{
"name":"name",
"url":"url",
"dateAdded":"date",
"data": [
{
"2021-04-25": 9.99
},
{
"2021-04-26": 19.99
}
]
}
}
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