英文:
Firestore golang issue with unmarshalling to proto type
问题
我正在尝试理解为什么在将结构体的引用传递给protobuf中的DataTo()方法后，它没有返回所有字段，但是如果我运行几乎相同的Data()方法，我可以得到所有字段。
type Employee struct {
StartDate string
Id string
Name string
Avatar string
}
list, err := client.Collection(Company).Doc(user.CompanyID).Collection(Workers).Documents(ctx).GetAll()
if err != nil {
log.Println(err.Error())
}
values := make([]*pb.Employee, len(list))
for i, v := range list {
log.Println("By Data", &pb.Employee{
StartDate: fmt.Sprint(b.Data()["startDate"]),
Name: b.Data()["name"].(string),
Avatar: b.Data()["avatar"].(string),
Id: b.Data()["id"].(string),
})
u := &pb.Employee{}
b.DataTo(u)
log.Println("by dataTo", u.StartDate, u.Name, u.Avatar, u.Id)
values[i]= u
}
log.Println(values)
输出：
By Data start_date:"2022-07-08 12:37:47.132904 +0000 UTC" id:"DILBuRmxVzVpOVG4iPuUeb8A4tN2" name:"alap" avatar:"https://image.com"
by dataTo
By Data start_date:"2022-07-08 12:37:39.901286 +0000 UTC" id:"bH6wuk0ooCMKsh7RQqlGWtXhIZr1" name:"Jack" avatar:"https://image3.com"
by dataTo Jack https://image3.com
[avatar:"https://image.com" name:"Jakub" avatar:"https://image3.com"]
所以，如上所示，当尝试通过DataTo(p)方法获取文档时，缺少了一些内容。有人能看出我在这里做错了什么吗？
谢谢。
英文:
i am trying to understand why the DataTo() method is not returning me all fields after passing the reference of struct in protobuf, but if i run almost same method Data() i am getting all
type Employee struct {
StartDate string
Id string
Name string
Avatar string
}
list, err := client.Collection(Company).Doc(user.CompanyID).Collection(Workers).Documents(ctx).GetAll()
if err != nil {
log.Println(err.Error())
}
values := make([]*pb.Employee, len(list))
for i, v := range list {
log.Println("By Data", &pb.Employee{
StartDate: fmt.Sprint(b.Data()["startDate"]),
Name: b.Data()["name"].(string),
Avatar: b.Data()["avatar"].(string),
Id: b.Data()["id"].(string),
})
u := &pb.Employee{}
b.DataTo(u)
log.Println("by dataTo", u.StartDate, u.Name, u.Avatar, u.Id)
values[i]= u
}
log.Println(values)
Output:
By Data start_date:"2022-07-08 12:37:47.132904 +0000 UTC" id:"DILBuRmxVzVpOVG4iPuUeb8A4tN2" name:"alap" avatar:"https://image.com"
by dataTo
By Data start_date:"2022-07-08 12:37:39.901286 +0000 UTC" id:"bH6wuk0ooCMKsh7RQqlGWtXhIZr1" name:"Jack" avatar:"https://image3.com"
by dataTo Jack https://image3.com
[avatar:"https://image.com" name:"Jakub" avatar:"https://image3.com"]
so as u could see above things are missing when trying to get document via DataTo(p) method. Anyone can see what i am doing wrong here ?
Regards.
答案1
得分: 1
这是一个很好的实践方法：
err := b.DataTo(&u)
if err != nil {
fmt.Println(err)
}
也许在你的情况下，struct 中的某个类型数据与 Firestore 中的模式不匹配。如果我能猜测一下，StartDate 字段在 Firestore 的模式中是一个 timestamp 字段，所以你必须在你的 Golang 结构体中设置 time.Time 类型。
英文:
its good practice for using
err := b.DataTo(&u)
if err != nil {
fmt.Println(err)
}
maybe in your case, there is type data in the struct that didn't match with the schema in firestore.
if I could guess the StartDate field. if in the firestore schema it is a timestamp field, so you must set time.Time in your golang struct.
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