devfeel/mapper

A simple and easy go tools for auto mapper struct to map, struct to struct, slice to slice, map to slice, map to json.

1. Install

go get -u github.com/devfeel/mapper

2. Getting Started

Traditional Usage

package main

import (
    "fmt"
    "github.com/devfeel/mapper"
)

type (
    User struct {
        Name string
        Age  int
        Id   string `mapper:"_id"`
        AA   string `json:"Score"`
        Time time.Time
    }

    Student struct {
        Name  string
        Age   int
        Id    string `mapper:"_id"`
        Score string
    }

    Teacher struct {
        Name  string
        Age   int
        Id    string `mapper:"_id"`
        Level string
    }
)

func init() {
    mapper.Register(&User{})
    mapper.Register(&Student{})
}

func main() {
    user := &User{}
    userMap := &User{}
    teacher := &Teacher{}
    student := &Student{Name: "test", Age: 10, Id: "testId", Score: "100"}
    valMap := make(map[string]interface{})
    valMap["Name"] = "map"
    valMap["Age"] = 10
    valMap["_id"] = "x1asd"
    valMap["Score"] = 100
    valMap["Time"] = time.Now()

    mapper.Mapper(student, user)
    mapper.AutoMapper(student, teacher)
    mapper.MapperMap(valMap, userMap)

    fmt.Println("student:", student)
    fmt.Println("user:", user)
    fmt.Println("teacher", teacher)
    fmt.Println("userMap:", userMap)
}

执行main，输出：

student: &{test 10 testId 100}
user: &{test 10 testId 100 0001-01-01 00:00:00 +0000 UTC}
teacher &{test 10 testId }
userMap: &{map 10 x1asd 100 2017-11-20 13:45:56.3972504 +0800 CST m=+0.006004001}

Object Usage

package main

import (
  "fmt"
  "github.com/devfeel/mapper"
)

type (
  User struct {
    Name  string `json:"name" mapper:"name"`
    Class int    `mapper:"class"`
    Age   int    `json:"age" mapper:"-"`
  }

  Student struct {
    Name  string `json:"name" mapper:"name"`
    Class int    `mapper:"class"`
    Age   []int  `json:"age" mapper:"-"`
  }
)

func main() {
  user := &User{Name: "shyandsy", Class: 1, Age: 10}
  student := &Student{}

  // create mapper object
  m := mapper.NewMapper()

  // in the version < v0.7.8, we will use field name as key when mapping structs
  // we keep it as default behavior in this version
  m.SetEnableIgnoreFieldTag(true)

  student.Age = []int{1}

  // disable the json tag
  m.SetEnabledJsonTag(false)

  // student::age should be 1
  m.Mapper(user, student)

  fmt.Println("user:")
  fmt.Println(user)
  fmt.Println("student:")
  fmt.Println(student)
}

执行main，输出：

user:
&{shyandsy 1 10}
student:
&{shyandsy 1 [1]}

Features

• 支持不同结构体相同名称相同类型字段自动赋值，使用Mapper
• 支持不同结构体Slice的自动赋值，使用MapperSlice
• 支持字段为结构体时的自动赋值
• 支持struct到map的自动映射赋值，使用Mapper
• 支持map到struct的自动映射赋值，使用MapperMap
• 支持map到struct slice的自动赋值，使用MapToSlice
• 支持map与json的互相转换
• 支持Time与Unix自动转换
• 支持tag标签，tag关键字为 mapper
• 兼容json-tag标签
• 当tag为"-"时，将忽略tag定义，使用struct field name
• 无需手动Register struct，内部自动识别
• 支持开启关闭
• SetEnabledTypeChecking(bool) // 类型检查
• IsEnabledTypeChecking
• SetEnabledMapperTag // mapper tag
• IsEnabledMapperTag
• SetEnabledJsonTag // json tag
• IsEnabledJsonTag
• SetEnabledAutoTypeConvert // auto type convert
• IsEnabledAutoTypeConvert
• SetEnabledMapperStructField // mapper struct field
• IsEnabledMapperStructField