Fixed post updating

models/blog_post.go

@@ -22,7 +22,7 @@ import (
 
 type BlogPost struct {
 	gorm.Model
-	Url     string `json:"url" gorm:"primaryKey"`
+	Url     string `json:"url" gorm:"primaryKey unique"`
 	Title   string `json:"title" gorm:"unique"`
 	Date    string `json:"date" gorm:"default:NOW()"`
 	Content string `json:"content"`

repos/blog_repo.go

@@ -85,7 +85,7 @@ func (b *BlogRepo) UpdateExistingPost(p *models.BlogPost) error {
 	if p.Url == "" {
 		return errors.New("Url must exist to update a blog post record")
 	}
-	err := b.DB.Table("blog_posts").Save(p).Error
+	err := b.DB.Table("blog_posts").Where(&models.BlogPost{Url: p.Url}).Save(p).Error
 	if err != nil {
 		return err
 	}