reflectutils is for setting your struct value by using string name and path that follows reflectutils rules.
.Nameto set a property by field name.Person.Nameto set the name of the current property.Person.Addresses[0].Phoneto set an element of an array property.Person.Addresses[].Nameit will create a object of address and set it's property.Person.MapData.Nameit can also set value to map
go get github.com/sunfmin/reflectutilsBy given these structs
type Person struct {
Name string
Score float64
Gender int
Company *Company
Departments []*Department
Projects []Project
Phones map[string]string
Languages map[string]Language
}
type Language struct {
Code string
Name string
}
type Company struct {
Name string
Phone *Phone
Phone2 **Phone
}
type Department struct {
Id int
Name string
}
type Project struct {
Id string
Name string
Members []*Person
}
type Phone struct {
Number string
}For How to set simple field
var p *Person
Set(&p, "Name", "Felix")
Set(&p, "Score", 66.88)
Set(&p, "Gender", 1)
printJsonV(p)
fmt.Println(MustGet(&p, "Score"))
//Output:
// {
// "Name": "Felix",
// "Score": 66.88,
// "Gender": 1,
// "Company": null,
// "Departments": null,
// "Projects": null,
// "Phones": null,
// "Languages": null
// }
// 66.88For how to set a struct property
p := &Person{}
Set(p, ".Company.Name", "The Plant")
Set(p, ".Company.Phone.Number", "911")
printJsonV(p)
fmt.Println(MustGet(&p, ".Company.Phone.Number"))
//Output:
// {
// "Name": "",
// "Score": 0,
// "Gender": 0,
// "Company": {
// "Name": "The Plant",
// "Phone": {
// "Number": "911"
// }
// },
// "Departments": null,
// "Projects": null,
// "Phones": null,
// "Languages": null
// }
// 911For how to set slice and it's property
var p *Person
Set(&p, "Departments[0].Id", 1)
Set(&p, "Departments[0].Name", "High Tech")
Set(&p, "Projects[0].Name", "UIBuilder")
// if you jump the index for an array, It will put nil in between
// So there will be no index out of range error.
Set(&p, "Departments[3].Id", 1)
Set(&p, "Departments[3].Name", "High Tech")
printJsonV(p)
fmt.Println(MustGet(&p, "Departments[3].Name"))
fmt.Println(MustGet(&p, "Departments[4].Name"))
fmt.Println(MustGet(&p, "Projects[0].Name"))
//Output:
// {
// "Name": "",
// "Score": 0,
// "Gender": 0,
// "Company": null,
// "Departments": [
// {
// "Id": 1,
// "Name": "High Tech"
// },
// null,
// null,
// {
// "Id": 1,
// "Name": "High Tech"
// }
// ],
// "Projects": [
// {
// "Id": "",
// "Name": "UIBuilder",
// "Members": null
// }
// ],
// "Phones": null,
// "Languages": null
// }
// High Tech
// <nil>
// UIBuilderFor how to set map property
var p *Person
Set(&p, "Languages.en_US.Name", "United States")
Set(&p, "Languages.en_US.Code", "en_US")
Set(&p, "Languages.zh_CN.Name", "China")
Set(&p, "Languages.zh_CN.Code", "zh_CN")
printJsonV(p)
fmt.Println(MustGet(&p, "Languages.zh_CN.Code"))
//Output:
// {
// "Name": "",
// "Score": 0,
// "Gender": 0,
// "Company": null,
// "Departments": null,
// "Projects": null,
// "Phones": null,
// "Languages": {
// "en_US": {
// "Code": "en_US",
// "Name": "United States"
// },
// "zh_CN": {
// "Code": "zh_CN",
// "Name": "China"
// }
// }
// }
// zh_CNYou can do whatever deeper you like
var p *Person
Set(&p, "Projects[0].Members[0].Company.Phone.Number", "911")
printJsonV(p)
fmt.Println(MustGet(&p, "Projects[0].Members[0].Company.Phone.Number"))
//Output:
// {
// "Name": "",
// "Score": 0,
// "Gender": 0,
// "Company": null,
// "Departments": null,
// "Projects": [
// {
// "Id": "",
// "Name": "",
// "Members": [
// {
// "Name": "",
// "Score": 0,
// "Gender": 0,
// "Company": {
// "Name": "",
// "Phone": {
// "Number": "911"
// }
// },
// "Departments": null,
// "Projects": null,
// "Phones": null,
// "Languages": null
// }
// ]
// }
// ],
// "Phones": null,
// "Languages": null
// }
// 911A new way to append to an array
var p *Person
for i := 1; i < 6; i++ {
var d *Department
Set(&d, "Id", i)
Set(&d, "Name", fmt.Sprintf("Department of Energy %d", i))
Set(&p, "Departments[]", d)
}
printJsonV(p)
//Output:
// {
// "Name": "",
// "Score": 0,
// "Gender": 0,
// "Company": null,
// "Departments": [
// {
// "Id": 1,
// "Name": "Department of Energy 1"
// },
// {
// "Id": 2,
// "Name": "Department of Energy 2"
// },
// {
// "Id": 3,
// "Name": "Department of Energy 3"
// },
// {
// "Id": 4,
// "Name": "Department of Energy 4"
// },
// {
// "Id": 5,
// "Name": "Department of Energy 5"
// }
// ],
// "Projects": null,
// "Phones": null,
// "Languages": null
// }You could also set []byte data to string property, and vice versa. And set string value to int, float
type Obj struct {
ByteProperty []byte
StringProperty string
IntValue int
FloatValue float64
IntValueForBytes int
}
var o *Obj
Set(&o, "ByteProperty", "hello")
Set(&o, "StringProperty", []byte{0x46, 0x65, 0x6c, 0x69, 0x78})
Set(&o, "IntValue", "22")
Set(&o, "IntValueForBytes", []byte{0x32, 0x32})
Set(&o, "FloatValue", "22.88")
fmt.Println(string(o.ByteProperty))
fmt.Println(o.StringProperty)
fmt.Println(o.IntValue)
fmt.Println(o.FloatValue)
fmt.Println(o.IntValueForBytes)
//Output:
//hello
//Felix
//22
//22.88
//22If you set a property that don't exists, it gives you an error.
var p *Person
err := Set(&p, "Whatever.Not.Exists", "911")
fmt.Println(err)
//Output:
// no such field.Get Type of a deep nested object
type Variant struct {
Name string
}
type Product struct {
Variants []*Variant
ByCode map[string]*Variant
}
type Obj struct {
MainProduct *Product
}
var o *Obj
fmt.Println(GetType(o, "MainProduct.Variants[0].Name"))
fmt.Println(GetType(o, "MainProduct.Variants[0]"))
fmt.Println(GetType(o, "MainProduct.Variants"))
fmt.Println(GetType(o, "MainProduct"))
fmt.Println(GetType(o, "MainProduct.ByCode.abc"))
fmt.Println(GetType(o, "MainProduct.ByCode"))
fmt.Println(GetType(o, "x123.ByCode"))
fmt.Println(GetType(o, "MainProduct.ByCode.abc.NotExist"))
//Output:
//string
//*reflectutils_test.Variant
//[]*reflectutils_test.Variant
//*reflectutils_test.Product
//*reflectutils_test.Variant
//map[string]*reflectutils_test.Variant
//<nil>
//<nil>