I am really stuck here with a seemingly trivial problem in Go: I have a Golang microservice, which outputs data in json format. Let's say I have a simple struct with json tags for this result:
type Result struct {
Name string `json:"name"`
Age int `json:"age"`
}
In the code part where the data is actually pulled out of the database, I have a quite similar struct, like this:
type ResultBackend struct {
Name string `bson:"fullName"`
Age int `bson:"age"`
}
The struct fields are similar, except the different tags. I would like to keep things simple, and return just one struct from the backend service (ResultBackend), which can then be send as a JSON response, like this:
func process() Result {
var result ResultBackend
... do a MongoDB query here and store results in result variable ...
return result
}
This certainly would not work, because we have two different structs here. Of course one solution would be to embed both tags in one struct like so:
type Result struct {
Name string `json:"name" bson:"fullName"`
Age int `json:"age bson:"age"`
}
and then use this struct in the main code and the "process" function. This works, but this seems like "poisoning" the Result struct of the main code with the bson tags. What, for instance, if the backend result is a XML file? I'd have to add xml tags to the struct as well. Or maybe someday tags some very obsure database adapter. This doesn't seem to be the cleanest approach in my eyes. I'd rather have a clean Result struct in the main code, and simply to a conversion from one struct to another.
Is there any easy way doing that, or do I really have to copy all the fields of a ResultBackend struct to a new Result struct and return that? Or I am trying to over-simplify my code here? :)
Cheers!
