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example_struct_test.go
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/
example_struct_test.go
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package conversion
import "fmt"
type S1 struct {
FirstName string
LastName string
}
type S2 struct {
FirstName string
LastName string
}
type S3 struct {
FirstName string
LastName string
Age int
}
type S4 struct {
FirstName *string
LastName *string
}
// This example demonstrates how to map from a struct to a struct with the same
// number of fields.
func ExampleMapper_Map_identical() {
source := S1{FirstName: "John", LastName: "Doe"}
var destination S2
cfg := NewConfiguration()
mapper := cfg.BuildMapper()
err := mapper.Map(source, &destination)
if err != nil {
fmt.Println(err)
return
}
fmt.Println(destination.FirstName)
fmt.Println(destination.LastName)
// Output:
// John
// Doe
}
// This example demonstrates how to map from a struct to a struct with a
// different number of fields.
func ExampleMapper_Map_fieldMismatch() {
source := S1{FirstName: "John", LastName: "Doe"}
var destination S3
cfg := NewConfiguration()
mapper := cfg.BuildMapper()
err := mapper.Map(source, &destination)
if err != nil {
fmt.Println(err)
return
}
fmt.Println(destination.FirstName)
fmt.Println(destination.LastName)
fmt.Println(destination.Age)
// Output:
// John
// Doe
// 0
}
// This example demonstrates how to map from a struct to a struct with a
// different number of fields, and how any fields that are not mapped will
// have their original values.
func ExampleMapper_Map_fieldMismatchWithDefaults() {
source := S1{FirstName: "John", LastName: "Doe"}
destination := S3{Age: 42}
cfg := NewConfiguration()
mapper := cfg.BuildMapper()
err := mapper.Map(source, &destination)
if err != nil {
fmt.Println(err)
return
}
fmt.Println(destination.FirstName)
fmt.Println(destination.LastName)
fmt.Println(destination.Age)
// Output:
// John
// Doe
// 42
}
// This example demonstrates how to map from a struct to a struct with the same
// fields, except that the destination fields are pointers. This can be useful
// when making API calls where requests often have optional fields.
func ExampleMapper_Map_pointer() {
source := S1{FirstName: "John", LastName: "Doe"}
var destination S4
cfg := NewConfiguration()
mapper := cfg.BuildMapper()
err := mapper.Map(source, &destination)
if err != nil {
fmt.Println(err)
return
}
fmt.Println(*destination.FirstName)
fmt.Println(*destination.LastName)
// Output:
// John
// Doe
}