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pagination.go
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/
pagination.go
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package handler
import (
"github.com/labstack/echo/v4"
"strconv"
)
type PaginationMetadata struct {
TotalCount int64 `json:"totalCount"`
PageCount int64 `json:"pageCount"`
PerPage int64 `json:"perPage"`
Next int64 `json:"next"`
HasNext bool `json:"hasNext"`
HasPrevious bool `json:"hasPrevious"`
Current int64 `json:"current"`
Previous int64 `json:"previous"`
}
func GetPagination(c echo.Context) (pageNumber, pageSize int64) {
pageNumber = 1
pageSize = 20
if page := c.QueryParam("page"); page != "" {
pageNumber, _ = strconv.ParseInt(page, 10, 32)
if pageNumber <= 0 {
pageNumber = 1
}
}
if size := c.QueryParam("pagesize"); size != "" {
pageSize, _ = strconv.ParseInt(size, 10, 32)
if pageSize <= 0 {
pageSize = 20
}
}
return pageNumber, pageSize
}
func GetPaginationMetadata(total int64, pageNumber int64, pageSize int64) PaginationMetadata {
pageCount := (total + pageSize - 1) / pageSize
result := PaginationMetadata{
TotalCount: total,
PageCount: pageNumber,
PerPage: pageSize,
Next: pageCount,
Current: pageNumber,
Previous: 1,
}
if pageNumber < pageCount {
result.Next = pageNumber + 1
result.HasNext = true
}
if pageNumber > 1 {
result.Previous = pageNumber - 1
result.HasPrevious = true
}
return result
}