英文:
Golang MGO - Insert or update not working as expected
问题
我正在使用MGO包连接我的MongoDB数据库，运行在Go语言的网站上。
我正在处理用户的登录，并尝试使用Upsert()函数来更新用户，如果他们在数据库中存在，则插入。
问题是，当我运行Upsert()（下面的代码）时，它会替换所有字段，而不仅仅是更新第二个参数bson.M{}中存在的字段。
db.C("users").Upsert(
bson.M{"email": "someone@gmail.com"}, // 要更新的文档
bson.M{"displayName": "Johhny"}, // 要替换的内容
)
我尝试解释的一个可视化示例。
现有的数据库文档：
{
"_id" : ObjectId("58e7589bab64da55ebcf5d25"),
"email" : "someone@gmail.com",
"password" : "",
"age": 69,
"displayName" : "Someone!"
}
运行后：
db.C("users").Upsert(
bson.M{"email": "someone@gmail.com"},
bson.M{"displayName": "My name was updated"},
)
文档变为：
{
"_id" : ObjectId("58e789feab64da55ebcf691c"),
"displayName" : "My name was updated"
}
我期望文档变为：
{
"_id" : ObjectId("58e7589bab64da55ebcf5d25"),
"email" : "someone@gmail.com",
"password" : "",
"age": 69,
"displayName" : "My name was updated" // 这个字段应该被更新，其他字段应该保持不变
}
最后我的问题是。
如何在MongoDB集合中更新文档，如果文档已经存在，则插入它？
英文:
I'm running a website in Go and I'm using the MGO package to connect with my MongoDB database.
I am handling a user's sign in, and I am trying to use the func Upsert() to update a user if they exist in the database, otherwise insert them.
The issue is, when I run Upsert() (the code below), it replaces all fields rather than updating only the present fields in the second argument's bson.M{}.
db.C("users").Upsert(
bson.M{"email": "someone@gmail.com"}, // Which doucment to upsert
bson.M{"displayName": "Johhny"}, // What to replace
)
A visual example of what I'm trying to explain.
An existing database document:
{
"_id" : ObjectId("58e7589bab64da55ebcf5d25"),
"email" : "someone@gmail.com",
"password" : "",
"age": 69,
"displayName" : "Someone!"
}
After running:
db.C("users").Upsert(
bson.M{"email": "someone@gmail.com"},
bson.M{"displayName": "My name was updated"},
)
The document becomes:
{
"_id" : ObjectId("58e789feab64da55ebcf691c"),
"displayName" : "My name was updated"
}
When I expected the document to become:
{
"_id" : ObjectId("58e7589bab64da55ebcf5d25"),
"email" : "someone@gmail.com",
"password" : "",
"age": 69,
"displayName" : "My name was updated" // This should be updated, all others should be left untouched
}
Finally my question.
How can I update a document if it already exists in a MongoDB collection, otherwise insert it?
答案1
得分: 5
如果您想要使用提供的字段更新文档，并忽略所有其他字段，我认为在没有先进行选择的情况下是不可能的。
编辑：
尝试以下代码：
db.C("users").Upsert(
bson.M{"email": "someone@gmail.com"},
bson.M{"$set": bson.M{"displayName": "My name was updated"}},
)
英文:
If you are trying to update a document with fields that you provide and ignore all other fields then I think it's not possible without a select first.
See this question on stack overflow
EDIT:
Try:
db.C("users").Upsert(
bson.M{"email": "someone@gmail.com"},
bson.M{"$set": bson.M{"displayName": "My name was updated"}},
)
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