niki/param/pagination.go

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package param
const (
defaultPageNumber = 1
dafaultPageSize = 10
)
type PaginationRequest struct {
PageSize uint
PageNumber uint
}
type PaginationResponse struct {
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PageSize uint `json:"page_size" example:"10"`
PageNumber uint `json:"page_number" example:"1"`
Total uint `json:"total" example:"100"`
}
func (p *PaginationRequest) GetPageNumber() uint {
if p.PageNumber <= 0 {
p.PageNumber = defaultPageNumber
}
return p.PageNumber
}
func (p *PaginationRequest) GetOffset() uint {
return (p.GetPageNumber() - 1) * p.GetPageSize()
}
func (p *PaginationRequest) GetPageSize() uint {
validPageSizes := []uint{10, 25, 50, 100}
for _, size := range validPageSizes {
if p.PageSize == size {
return size
}
}
return dafaultPageSize
}