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package nullable_test
import (
"encoding/json"
"fmt"
"github.com/oapi-codegen/nullable"
)
func ExampleNewNullNullable() {
p := struct {
N nullable.Nullable[int]
}{}
p.N = nullable.NewNullNullable[int]()
fmt.Printf("Specified: %v\n", p.N.IsSpecified())
fmt.Printf("Null: %v\n", p.N.IsNull())
// Output:
// Specified: true
// Null: true
}
func ExampleNewNullableWithValue() {
p := struct {
N nullable.Nullable[int]
}{}
p.N = nullable.NewNullableWithValue(123)
fmt.Println(p.N.Get())
// Output:
// 123 <nil>
}
func ExampleNullable_marshalRequired() {
obj := struct {
ID nullable.Nullable[int] `json:"id"`
}{}
// when it's not set (by default)
b, err := json.Marshal(obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Unspecified:")
fmt.Printf(`JSON: %s`+"\n", b)
fmt.Println("---")
// when it's not set (explicitly)
obj.ID.SetUnspecified()
b, err = json.Marshal(obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Unspecified:")
fmt.Printf(`JSON: %s`+"\n", b)
fmt.Println("---")
// when it's set explicitly to nil
obj.ID.SetNull()
b, err = json.Marshal(obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Null:")
fmt.Printf(`JSON: %s`+"\n", b)
fmt.Println("---")
// when it's set explicitly to the zero value
var v int
obj.ID.Set(v)
b, err = json.Marshal(obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Zero value:")
fmt.Printf(`JSON: %s`+"\n", b)
fmt.Println("---")
// when it's set explicitly to a specific value
v = 12345
obj.ID.Set(v)
b, err = json.Marshal(obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Value:")
fmt.Printf(`JSON: %s`+"\n", b)
fmt.Println("---")
// Output:
// Unspecified:
// JSON: {"id":0}
// ---
// Unspecified:
// JSON: {"id":0}
// ---
// Null:
// JSON: {"id":null}
// ---
// Zero value:
// JSON: {"id":0}
// ---
// Value:
// JSON: {"id":12345}
// ---
}
func ExampleNullable_marshalOptional() {
obj := struct {
ID nullable.Nullable[int] `json:"id,omitempty"`
}{}
// when it's not set (by default)
b, err := json.Marshal(obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Unspecified:")
fmt.Printf(`JSON: %s`+"\n", b)
fmt.Println("---")
// when it's not set (explicitly)
obj.ID.SetUnspecified()
b, err = json.Marshal(obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Unspecified:")
fmt.Printf(`JSON: %s`+"\n", b)
fmt.Println("---")
// when it's set explicitly to nil
obj.ID.SetNull()
b, err = json.Marshal(obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Null:")
fmt.Printf(`JSON: %s`+"\n", b)
fmt.Println("---")
// when it's set explicitly to the zero value
var v int
obj.ID.Set(v)
b, err = json.Marshal(obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Zero value:")
fmt.Printf(`JSON: %s`+"\n", b)
fmt.Println("---")
// when it's set explicitly to a specific value
v = 12345
obj.ID.Set(v)
b, err = json.Marshal(obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Value:")
fmt.Printf(`JSON: %s`+"\n", b)
fmt.Println("---")
// Output:
// Unspecified:
// JSON: {}
// ---
// Unspecified:
// JSON: {}
// ---
// Null:
// JSON: {"id":null}
// ---
// Zero value:
// JSON: {"id":0}
// ---
// Value:
// JSON: {"id":12345}
// ---
}
func ExampleNullable_unmarshalRequired() {
obj := struct {
Name nullable.Nullable[string] `json:"name"`
}{}
// when it's not set
err := json.Unmarshal([]byte(`
{
}
`), &obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Unspecified:")
fmt.Printf("obj.Name.IsSpecified(): %v\n", obj.Name.IsSpecified())
fmt.Printf("obj.Name.IsNull(): %v\n", obj.Name.IsNull())
fmt.Println("---")
// when it's set explicitly to nil
err = json.Unmarshal([]byte(`
{
"name": null
}
`), &obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Null:")
fmt.Printf("obj.Name.IsSpecified(): %v\n", obj.Name.IsSpecified())
fmt.Printf("obj.Name.IsNull(): %v\n", obj.Name.IsNull())
fmt.Println("---")
// when it's set explicitly to the zero value
err = json.Unmarshal([]byte(`
{
"name": ""
}
`), &obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Zero value:")
fmt.Printf("obj.Name.IsSpecified(): %v\n", obj.Name.IsSpecified())
fmt.Printf("obj.Name.IsNull(): %v\n", obj.Name.IsNull())
val, err := obj.Name.Get()
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Printf("obj.Name.Get(): %#v <nil>\n", val)
fmt.Printf("obj.Name.GetOrEmpty(): %#v\n", obj.Name.GetOrEmpty())
fmt.Printf("obj.Name.MustGet(): %#v\n", obj.Name.MustGet())
fmt.Println("---")
// when it's set explicitly to a specific value
err = json.Unmarshal([]byte(`
{
"name": "foo"
}
`), &obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Value:")
fmt.Printf("obj.Name.IsSpecified(): %v\n", obj.Name.IsSpecified())
fmt.Printf("obj.Name.IsNull(): %v\n", obj.Name.IsNull())
val, err = obj.Name.Get()
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Printf("obj.Name.Get(): %#v <nil>\n", val)
fmt.Printf("obj.Name.GetOrEmpty(): %#v\n", obj.Name.GetOrEmpty())
fmt.Printf("obj.Name.MustGet(): %#v\n", obj.Name.MustGet())
fmt.Println("---")
// Output:
// Unspecified:
// obj.Name.IsSpecified(): false
// obj.Name.IsNull(): false
// ---
// Null:
// obj.Name.IsSpecified(): true
// obj.Name.IsNull(): true
// ---
// Zero value:
// obj.Name.IsSpecified(): true
// obj.Name.IsNull(): false
// obj.Name.Get(): "" <nil>
// obj.Name.GetOrEmpty(): ""
// obj.Name.MustGet(): ""
// ---
// Value:
// obj.Name.IsSpecified(): true
// obj.Name.IsNull(): false
// obj.Name.Get(): "foo" <nil>
// obj.Name.GetOrEmpty(): "foo"
// obj.Name.MustGet(): "foo"
// ---
}
func ExampleNullable_unmarshalOptional() {
obj := struct {
// Note that there is no pointer for nullable.Nullable when it's
Name nullable.Nullable[string] `json:"name,omitempty"`
}{}
// when it's not set
err := json.Unmarshal([]byte(`
{
}
`), &obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Unspecified:")
fmt.Printf("obj.Name.IsSpecified(): %v\n", obj.Name.IsSpecified())
fmt.Printf("obj.Name.IsNull(): %v\n", obj.Name.IsNull())
fmt.Println("---")
// when it's set explicitly to nil
err = json.Unmarshal([]byte(`
{
"name": null
}
`), &obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Null:")
fmt.Printf("obj.Name.IsSpecified(): %v\n", obj.Name.IsSpecified())
fmt.Printf("obj.Name.IsNull(): %v\n", obj.Name.IsNull())
fmt.Println("---")
// when it's set explicitly to the zero value
err = json.Unmarshal([]byte(`
{
"name": ""
}
`), &obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Zero value:")
fmt.Printf("obj.Name.IsSpecified(): %v\n", obj.Name.IsSpecified())
fmt.Printf("obj.Name.IsNull(): %v\n", obj.Name.IsNull())
val, err := obj.Name.Get()
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Printf("obj.Name.Get(): %#v <nil>\n", val)
fmt.Printf("obj.Name.GetOrEmpty(): %#v\n", obj.Name.GetOrEmpty())
fmt.Printf("obj.Name.MustGet(): %#v\n", obj.Name.MustGet())
fmt.Println("---")
// when it's set explicitly to a specific value
err = json.Unmarshal([]byte(`
{
"name": "foo"
}
`), &obj)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Println("Value:")
fmt.Printf("obj.Name.IsSpecified(): %v\n", obj.Name.IsSpecified())
fmt.Printf("obj.Name.IsNull(): %v\n", obj.Name.IsNull())
val, err = obj.Name.Get()
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
fmt.Printf("obj.Name.Get(): %#v <nil>\n", val)
fmt.Printf("obj.Name.GetOrEmpty(): %#v\n", obj.Name.GetOrEmpty())
fmt.Printf("obj.Name.MustGet(): %#v\n", obj.Name.MustGet())
fmt.Println("---")
// Output:
// Unspecified:
// obj.Name.IsSpecified(): false
// obj.Name.IsNull(): false
// ---
// Null:
// obj.Name.IsSpecified(): true
// obj.Name.IsNull(): true
// ---
// Zero value:
// obj.Name.IsSpecified(): true
// obj.Name.IsNull(): false
// obj.Name.Get(): "" <nil>
// obj.Name.GetOrEmpty(): ""
// obj.Name.MustGet(): ""
// ---
// Value:
// obj.Name.IsSpecified(): true
// obj.Name.IsNull(): false
// obj.Name.Get(): "foo" <nil>
// obj.Name.GetOrEmpty(): "foo"
// obj.Name.MustGet(): "foo"
// ---
}