pagination

type Callable func(rec interface{}) interface{}

type Paginator struct {
	TotalRecord int         `json:"total_record"`
	TotalPage   int         `json:"total_page"`
	Records     interface{} `json:"records"`
	Offset      int         `json:"offset"`
	Limit       int         `json:"limit"`
	Page        int         `json:"page"`
	PrevPage    int         `json:"prev_page"`
	NextPage    int         `json:"next_page"`
}

type Param struct {
	DB                *gorm.DB
	Page              int
	Limit             int
	OrderBy           []string
	ShowSQL           bool
	Preload           []string
	RecordTransformer Callable
}