77 lines
1.9 KiB
Go
77 lines
1.9 KiB
Go
package rspagination
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import (
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"math"
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"gorm.io/gorm"
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)
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// GetTotalPages returns total pages for pagination
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// Example whereQuery = "stock_item_id = ?" and args = stockItemId is Where("stock_item_id = ?", stockItemId)
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func GetTotalPages(database *gorm.DB, paginationLimit int, any interface{}, whereQuery interface{}, args ...interface{}) int {
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var totalPages int64
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if whereQuery == nil {
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database.Model(any).
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Count(&totalPages)
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} else if len(args) == 0 { // here used with db.Where(&User{Name: "jinzhu", Age: 20}).First(&user)
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database.Model(any).
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Where(whereQuery).
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Count(&totalPages)
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} else { // here used with "name = ?", "jinzhu"
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database.Model(any).
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Where(whereQuery, args).
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Count(&totalPages)
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}
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return CalculateTotalPages(int(totalPages), paginationLimit)
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}
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func CalculateTotalPages(totalItems int, paginationLimit int) int {
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return int(math.Ceil(float64(totalItems) / float64(paginationLimit)))
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}
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func GetPageOffset(page int, paginationLimit int) int {
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return (page - 1) * paginationLimit
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}
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type PageQuery struct {
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Page int
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}
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func DbPageQuery(database *gorm.DB, query PageQuery, paginationLimit int, result any, orderBy string, whereQuery interface{}, args ...interface{}) *gorm.DB {
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if whereQuery == nil {
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return database.Limit(paginationLimit).
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Offset(GetPageOffset(query.Page, paginationLimit)).
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Order(orderBy).
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Find(result)
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}
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return database.Limit(paginationLimit).
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Offset(GetPageOffset(query.Page, paginationLimit)).
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Where(whereQuery, args).
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Order(orderBy).
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Find(result)
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}
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// GetPage returns start and end for pagination
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// can be used like this: robots[start:end]
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func GetPage(lenList int, page int, limit int) (start int, end int) {
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if page <= 0 {
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page = 1
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}
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start = (page - 1) * limit
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end = page * limit
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if start > lenList {
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start = lenList
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}
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if end > lenList {
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end = lenList
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}
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return start, end
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}
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