Open ryan961 opened 7 months ago
github.com/oapi-codegen/nullable
This package provides tools and code functionalities for managing nullable values during JSON marshaling and unmarshaling.. In situations where data might not have a definite value, this repository offers mechanisms to handle those values, reducing possibilities of errors or bugs in your project. By incorporating this repository into your work, you can have a consistent and strong handling of nullable values.
package main
import (
"encoding/json"
"fmt"
"github.com/oapi-codegen/nullable"
)
func main() {
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("---")
}
Hi Ryan961,
What AI summarization tool did you use for this article? Have you tried Gitblog's AI meta generator tool?
🤖️ AI Summary
The article discusses handling JSON fields in Go that can be absent,
null
, or have a value. It presents a challenge when differentiating between fields that are unspecified or explicitly set tonull
. The solution involves a custom typeNullable[T]
that uses amap
to represent three states: field not set, set tonull
, or set to a value. This approach, avoiding the use of pointers, allows clear distinction between these states during JSON marshaling and unmarshaling.🖇️ Details
📝 Note