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pagination.go
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pagination.go
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package ginhelper
import (
"github.com/gin-gonic/gin"
"github.com/jinzhu/gorm"
"github.com/zcong1993/libgo/utils"
"net/http"
"strconv"
)
// HEADER_TOTAL_COUNT is total count in header for pagination
const HEADER_TOTAL_COUNT = "X-TOTAL-COUNT"
func parsePaginationArg(c *gin.Context, key string, defaultValue int) int {
valueStr, ok := c.GetQuery(key)
if !ok {
return defaultValue
}
value, err := strconv.Atoi(valueStr)
if err != nil {
return defaultValue
}
if value <= 0 {
return defaultValue
}
return value
}
// OffsetLimitPaginator is struct of OffsetLimit style paginator
type OffsetLimitPaginator struct {
DefaultNumPerPage int
}
// NewOffsetLimitPaginator init a OffsetLimitPaginator by default num per page
func NewOffsetLimitPaginator(defaultNumPerPage int) *OffsetLimitPaginator {
return &OffsetLimitPaginator{DefaultNumPerPage: defaultNumPerPage}
}
// ParsePagination get limit and offset from request
func (op *OffsetLimitPaginator) ParsePagination(c *gin.Context) (limit, offset int) {
return parsePaginationArg(c, "limit", op.DefaultNumPerPage), parsePaginationArg(c, "offset", 0)
}
// DefaultOffsetLimitPaginator is default OffsetLimitPaginator with 100 items per page
var DefaultOffsetLimitPaginator = NewOffsetLimitPaginator(100)
// ResponsePagination response array data with total count in header
func ResponsePagination(ctx *gin.Context, count int, data interface{}) {
ctx.Header(HEADER_TOTAL_COUNT, utils.Num2String(count))
ctx.JSON(http.StatusOK, data)
}
// PaginationQuery query with pagination, return total count
func PaginationQuery(db *gorm.DB, t interface{}, limit, offset int) (int, error) {
var count int
count = 0
err := db.Count(&count).Error
if err != nil {
return count, err
}
err = db.Limit(limit).Offset(offset).Find(t).Error
if err != nil {
return count, err
}
return count, nil
}