使用结构(或protobuf消息)作为数据更新Golang中的Firestore文档 [英] Updating Firestore documents in Golang using structs (or protobuf messages) as data
问题描述
使用以下API:
syntax = "proto3";
service FooService {
rpc UpdateFoo(UpdateFooRequest) returns (Foo) {}
}
message Foo {
string name = 1;
string description = 2;
string action = 3;
}
message UpdateFooRequest {
Foo foo = 1;
// The list of fields to be updated. For the `FieldMask` definition,
// see https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#fieldmask
google.protobuf.FieldMask update_mask = 2;
}
此API与后端Firestore的"foos"对话.收藏.
该实现在Golang中. firestore
包有一个 Update()
方法,但是它需要提供一个 firestore.Update
结构的列表:
This API talks to a backend Firestore "foos" collection.
The implementation is in Golang. The firestore
package has an Update()
method, but it requires to provide a list of firestore.Update
structs:
type Update struct {
Path string // Will be split on dots, and must not contain any of "˜*/[]".
FieldPath FieldPath
Value interface{}
}
我在编写RPC UpdateFoo
的实现时遇到问题:我无法轻松构造 firestore.Update
结构.同时,我想确保 update_mask
中提供的路径有效.
I have problems writing the implementation of the RPC UpdateFoo
: I cannot easily construct the firestore.Update
struct. At the same time, I want to ensure that the paths provided in the update_mask
are valid.
这是我正在尝试的:
func (s *Server) UpdateFoo(ctx context.Context, req *pb.UpdateFooRequest) (*pb.Foo, error) {
var updates []firestore.Update
// Loop all paths in the update_mask
for _, p := range req.GetUpdateMask().GetPaths() {
// Check that path is valid field of Foo message.
// How to do this?
...
...
if path is not valid {
return nil, status.Errorf(codes.InvalidArgument, "invalid path %s", p)
}
// When path is valid, I need to take the value from the req.GetFoo() message
// How to do this?
newValue := req.GetFoo().Get????<this is p variable>
update = append(update, &firestore.Update{Path: p, Value: newValue}
}
任何提示将不胜感激.
推荐答案
我在Golang中尝试将Firestore与protobuf一起使用时遇到了类似的问题.似乎不支持使用原型场掩码和结构进行更新.
I ran into a similar issue trying to use firestore along with protobuf in Golang. There does not seem to be support for using proto field masks and structs to do updates.
这是使用 Set
和 fieldmask-utils 的一种解决方法:
Here's a workaround with Set
and fieldmask-utils:
import (
"github.com/golang/protobuf/protoc-gen-go/generator"
fieldmask_utils "github.com/mennanov/fieldmask-utils"
)
var (
id string
request UpdateFooRequest
)
mask, err: = fieldmask_utils.MaskFromProtoFieldMask(request.FieldMask, generator.CamelCase)
// handle err...
m := make(map[string]interface{}) // a map to copy to
err := fieldmask_utils.StructToMap(mask, request.Foo, m)
// handle err..
_, err = r.client.Collection(r.collection).Doc(id).Set(ctx, m, firestore.MergeAll)
// handle err..
这篇关于使用结构(或protobuf消息)作为数据更新Golang中的Firestore文档的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!