I have a struct like this:
type MyStruct struct {
Name string `json:"name"`
Age int `json:"age"`
Email string `json:"email"`
}
然后我有一些值(可以是默认值，这意味着我不需要更新这个值)作为HTTP请求数据输入.我注意到生成的JSON正文将始终包含所有三个字段(name、age和email)，即使我不需要更新所有字段.这样地:
{
"name":"Kevin",
"age":10,
"email":""
}
Is there a way to Marshal so that the JSON body contains not all fields with the same struct? Example:
{
"name":"kevin"
}
您想要使用omitempty选项
type MyStruct struct {
Name string `json:"name,omitempty"`
Age int `json:"age"`
Email string `json:"email,omitempty"`
}
If you want Age to be optional as well you have to use a pointer, since the zero value of an int isn't really "empty"
type MyStruct struct {
Name string `json:"name,omitempty"`
Age *int `json:"age,omitempty"`
Email string `json:"email,omitempty"`
}