posts, counter: Fixed post positions issues when a post is deleted.

internal/counter/counter.go

@@ -37,7 +37,7 @@ func NextMany(category, name string, increment int) (int, error) {
 	doc := counter{}
 
 	_, err := collection.Find(bson.M{"_id": id}).Apply(mgo.Change{
-		Update:    bson.M{"$inc": bson.M{"value": 1}},
+		Update:    bson.M{"$inc": bson.M{"value": increment}},
 		Upsert:    true,
 		ReturnNew: true,
 	}, &doc)

models/posts/remove.go

@@ -1,6 +1,7 @@
 package posts
 
 import (
+	"git.aiterp.net/rpdata/api/internal/counter"
 	"git.aiterp.net/rpdata/api/models"
 	"github.com/globalsign/mgo/bson"
 )
@@ -20,6 +21,8 @@ func Remove(post models.Post) (models.Post, error) {
 		return models.Post{}, err
 	}
 
+	counter.NextMany("next_post_id", post.LogID, -1)
+
 	return post, nil
 }