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pagination.go
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pagination.go
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package db
import (
"errors"
"fmt"
"github.com/gin-gonic/gin"
"github.com/jinzhu/gorm"
)
// Paginate sets the parameter related to pagination to db
func (parameter *Parameter) Paginate(db *gorm.DB) (*gorm.DB, error) {
if !parameter.IsPaginationEnabled {
return db, nil
}
if parameter == nil {
return nil, errors.New("Parameter struct got nil")
}
if parameter.IsLastID {
if parameter.Order == "asc" {
return db.Where("id > ?", parameter.LastID).Limit(parameter.Limit).Order("id asc"), nil
}
return db.Where("id < ?", parameter.LastID).Limit(parameter.Limit).Order("id desc"), nil
}
return db.Offset(parameter.Limit * (parameter.Page - 1)).Limit(parameter.Limit), nil
}
// SetHeaderLink sets the header links to HTTP header
func (parameter *Parameter) SetHeaderLink(c *gin.Context, index int) error {
if parameter == nil {
return errors.New("Parameter struct got nil")
}
var pretty, filters, preloads string
reqScheme := "http"
if c.Request.TLS != nil {
reqScheme = "https"
}
if _, ok := c.GetQuery("pretty"); ok {
pretty = "&pretty"
}
if len(parameter.Filters) != 0 {
filters = parameter.GetRawFilterQuery()
}
if parameter.Preloads != "" {
preloads = fmt.Sprintf("&preloads=%v", parameter.Preloads)
}
if parameter.IsLastID {
c.Header("Link", fmt.Sprintf("<%s://%v%v?limit=%v%s%s&last_id=%v&order=%v%s>; rel=\"next\"", reqScheme, c.Request.Host, c.Request.URL.Path, parameter.Limit, filters, preloads, index, parameter.Order, pretty))
return nil
}
if parameter.Page == 1 {
c.Header("Link", fmt.Sprintf("<%s://%v%v?limit=%v%s%s&page=%v%s>; rel=\"next\"", reqScheme, c.Request.Host, c.Request.URL.Path, parameter.Limit, filters, preloads, parameter.Page+1, pretty))
return nil
}
c.Header("Link", fmt.Sprintf(
"<%s://%v%v?limit=%v%s%s&page=%v%s>; rel=\"next\",<%s://%v%v?limit=%v%s%s&page=%v%s>; rel=\"prev\"", reqScheme,
c.Request.Host, c.Request.URL.Path, parameter.Limit, filters, preloads, parameter.Page+1, pretty, reqScheme, c.Request.Host, c.Request.URL.Path, parameter.Limit, filters, preloads, parameter.Page-1, pretty))
return nil
}