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meelel.go
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meelel.go
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/*
Copyright 2017 OÜ Nevermore
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package meelel
import (
"context"
"errors"
"time"
"github.com/mjibson/goon/v2"
"google.golang.org/appengine/v2/datastore"
)
type Post struct {
_kind string `goon:"kind,MeelelPost"`
Id string `datastore:"-" goon:"id"`
Active bool `datastore:"a"`
Created time.Time `datastore:"c"`
Modified time.Time `datastore:"m"`
Title string `datastore:"t,noindex"`
PageTitle string `datastore:"mt,noindex"`
MetaDescription string `datastore:"md,noindex"`
Content string `datastore:"co,noindex`
}
type Meelel struct {
g *goon.Goon
}
func New(c context.Context) *Meelel {
return NewWithGoon(goon.FromContext(c))
}
func NewWithGoon(g *goon.Goon) *Meelel {
return &Meelel{g: g}
}
func (m Meelel) SavePost(postData *Post) (*Post, error) {
if postData.Id == "" {
return nil, errors.New("No post id provided!")
}
post := &Post{Id: postData.Id}
err := m.g.RunInTransaction(func(tg *goon.Goon) error {
now := time.Now()
// Attempt to get the existing data for this post
if err := tg.Get(post); err == datastore.ErrNoSuchEntity {
// Post doesn't exist yet, so set the created time
post.Created = now
} else if err != nil {
return err
}
// Update the post data
post.Active = postData.Active
post.Title = postData.Title
post.PageTitle = postData.PageTitle
post.MetaDescription = postData.MetaDescription
post.Content = postData.Content
// Set the modified time
post.Modified = now
// Save the updated data
if _, err := tg.Put(post); err != nil {
return err
}
return nil
}, &datastore.TransactionOptions{XG: false})
if err != nil {
return nil, err
}
return post, nil
}
func (m Meelel) GetPost(id string) (*Post, error) {
post := &Post{Id: id}
if err := m.g.Get(post); err != nil {
return nil, err
}
return post, nil
}
func (m Meelel) DeletePost(id string) error {
post := &Post{Id: id}
if err := m.g.Delete(m.g.Key(post)); err != nil {
return err
}
return nil
}
func (m Meelel) GetRecentPosts(limit int) ([]*Post, error) {
ps := make([]*Post, 0)
if _, err := m.g.GetAll(datastore.NewQuery("MeelelPost").Order("-c").Limit(limit).KeysOnly(), &ps); err != nil {
return nil, err
}
if len(ps) > 0 {
if err := m.g.GetMulti(ps); err != nil {
return nil, err
}
}
return ps, nil
}
func (m Meelel) GetAllPostIds() ([]string, error) {
if keys, err := m.g.GetAll(datastore.NewQuery("MeelelPost").KeysOnly(), nil); err != nil {
return nil, err
} else {
ids := make([]string, 0, len(keys))
for _, key := range keys {
ids = append(ids, key.StringID())
}
return ids, nil
}
}