This Protobuf PoC illustrates the use of a repeated field where its value can have different data structures.
For that we use a proto message with a repeated field of another proto message that use a field with an oneof.
It was used Buf CLI to generate Go Code from Protobuf, Buf also has a linter and formatter that was used in Protobuf files.
flowchart TB;
Collection[Collection struct]-- has a list of pointers to -->Item[Item struct];
Item-- contains -->isItem_Item[isItem_Item interface];
Item_ShowcaseItem[Item_ShowcaseItem struct] & Item_ProductItem[Item_ProductItem struct] -- implements -->isItem_Item;
Item_ProductItem-- has a pointer to -->Item_Product[Item_Product struct]
Item_ShowcaseItem-- has a pointer to -->Item_Showcase[Item_Showcase struct]
syntax = "proto3";
package item.v2;
option go_package = "github.com/donwellus/go-protobuf-oneof/proto";
message Item {
message Product {
string sku = 1;
}
message Showcase {
string pos = 1;
string category = 2;
string slug = 3;
}
oneof item {
Product product_item = 1;
Showcase showcase_item = 2;
}
}
message Collection {
repeated Item items = 1;
}Clone the repo, walk through the code and execute it: go run main.go