如何将新的布尔属性添加到Golang结构并将默认值设置为true？

Question

I have a user struct that corresponds to an entity. How can I add a new property active and set the default value to true?

Can I also set the value of that property to true for all existing entities by some easy method?

type User struct {
    Id              int64     `json:"id"`
    Name            string    `json:"name"`
}

Bonus questions: I don't quite understand the syntax in the struct. What do the three columns represent? What do the JSON strings have ``around them?

Answer 1

You have to set the default value as true at the moment when you are passing the struct type to a variable, but this means you need to extend that struct with a new Active field.

type User struct {
    Id              int64     `json:"id"`
    Name            string    `json:"name"`
    Active          bool
}

user := User{1, "John", true}

json:"id" means that you are mapping the json decoded object field to the field id in your struct type. Practically you are deserialize the json string into object fields which later you can map to their specific field inside the struct.