structs

structs

Various helpful golang structs package

Zeroable types

Default value is zero value.

• date
• time

Nullable types

Default value is null value.

• string
• bool
• int64
• float64
• time
• date

Usage

Get package via go get github.com/smgladkovskiy/structs or via dep ensure add github.com/smgladkovskiy/structs if you use dep.

Import package in your go file:

package main

import (
	"github.com/smgladkovskiy/structs"      // if need to set date or time format
	"github.com/smgladkovskiy/structs/null" // if nullables are used
	"github.com/smgladkovskiy/structs/zero" // if zeroables are used
)

Use in code:

package main

import (
	"fmt"
	"time"
	
	"github.com/smgladkovskiy/structs"      // if need to set date or time format
	"github.com/smgladkovskiy/structs/null" // if nullables are used
	"github.com/smgladkovskiy/structs/zero" // if zeroables are used
)

func main() {
	structs.TimeFormat = func() string {
	    return time.RFC1123
	  }
	
	customTime, _ := null.NewTime(time.Now())
	
	if !customTime.Valid {
		fmt.Println("time is null")
		return
	}
	
	fmt.Printf("custom time is %s", customTime.Time)
}

Helper functions and variables

zero.NewXXX(v interface{}) *zero.XXX

Initiates new zero value of XXX type, using Scan method with passed value.

null.NewXXX(v interface{}) *null.XXX

Initiates new nullable value of XXX type, using Scan method with passed value.

null.NewXXXf(format string, a ...interface{}) *null.XXX

Initiates new null.String type value for passed format string and format variables. Available for strings.

TimeFormat

There is an opportunity for zero.Time and null.Time types to set time format witch will be used with (Un)MarshallJSON methods.

To override default package format for time (time.RFC3339), there must be an stucts.TimeFormat function overriding in your app at the configuration or init level:

package main

import (
	"time"
	
	"github.com/smgladkovskiy/structs"
)

func main() {
	structs.TimeFormat = func() string {
		return time.RFC1123
	}
}

DateFormat

For zero.Date and null.Date types there is the same thing with format for (Un)MarshallJSON.

Default package date format (YYYY-MM-DD) must be overridden with stucts.DateFormat function:

package main

import (
	"github.com/smgladkovskiy/structs"
)

func init() {
	structs.DateFormat = func() string {
		return "02.01.2006"
	}
}