Plugin for GORM checking read data before updating for consistency

Consistently uses GORM callbacks to handle gorm:update and gorm:create, so you will need to register callbacks first:

import (
  "github.com/jinzhu/gorm"
  "github.com/ftomza/consistently
)

func main() {
  db, err := gorm.Open("sqlite3", "demo_db")

  consistently.RegisterCallbacks(db)
}

After callbacks are registered, an attempt to create or update any record checks all fields of the structure for the tag consistently:"version". If such a field is found, a new data version value will be assigned when the record is created, if it is updated, the version of the recorded data with the version in the database will be checked.

type User struct {
	gorm.Model
	Name string
	consistently.Consistently
}


func main() {
	
  db, err := gorm.Open("sqlite3", "demo_db")

  consistently.RegisterCallbacks(db)
  
  user := User{Name: "FtomZa"}
  
  db.Save(&user)
  
  fmt.printf("Version: %s\n", user.Version)
  
  user.Name = "FtomZa2"
  
  db.Update(&user)
  
  fmt.printf("Version: %s\n", user.Version)
}

If it is not possible to store version data in the version field by default, use the consistently:"version" tag to mark the field as a data version.

type User struct {
	gorm.Model
	Name string
	MyVersion string `consistently:"version"`
}

Released under the MIT License.