With merge-struct you can selectively update golang structs with
values from other structs.
mp.Struct updates a destination structure in-place with the same name fields
from a supplied patch struct. Fields get matched by their names (case sensitive).
Thus patch fields with a name not present in the destination structure are ignored.
Zero-value and unexported fields in a patch struct are also ignored.
Notice, both the destination and patch structure can have embedded structs in them.
import "github.com/geraldo-labs/merge-struct"
type Employee struct {
FirstName string
LastName string
Salary int
Extra string
}
type Patch struct {
FirstName string // names and types should match
LastName *string // however a patching field can also be a pointer
Salary int // only non-zero values are considered
unexported bool // unexported fields are ignored
Unknown []byte // fields not present in the target are also ignored
}
var e = Employee{
FirstName: "Anakin",
LastName: "Skywalker",
Salary: 123,
Extra: "unchanged",
}
var lastName = "Vader"
var p = Patch{
FirstName: "Darth",
LastName: &lastName, // pointer to a string
Salary: 0, // zero-value is ignored
unexported: true,
Unknown: []byte("ignored"),
}
var changed, err = patch.Struct(&e, p)
// now `e` is {"Darth", "Vader", 123, "unchanged"}