How Can I Efficiently Transfer Data Between Go Structs with Identical Members but Different Types?

Copy Structs with Identical Members and Variant Types

In Go, it's not uncommon to have structs with identical members but differing types. Consider the following example:

type Common struct {
    Gender int
    From   string
    To     string
}

type Foo struct {
    Id    string
    Name  string
    Extra Common
}

type Bar struct {
    Id    string
    Name  string
    Extra Common
}

Given an instance of Foo and Bar, how can we transfer data from one to the other?

Solution: Conversion

Since the underlying types of Foo and Bar are identical apart from struct tags, Go offers a straightforward solution: conversion. By converting the Foo value to type Bar, we effectively overwrite the existing data in Bar. Here's the code:

foo := Foo{Id: "123", Name: "Joe"}
bar := Bar(foo)

Example

Let's test the conversion in a playground example: https://go.dev/play/p/1W3EXQVXVhS.

Limitations

It's worth noting that conversion only works when the underlying types are the same except for struct tags. If the underlying types differ significantly, creating a dedicated copy function would be necessary.

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