Add CRUD Features for Blog Data

// GetAllBlogs returns all blogs from the database
func (b *BlogService) GetAllBlogs() []*model.Blog {
  // create a query to get all blog data
    var query primitive.D = bson.D{{}}

    // create a find option to order blog data by createdAt
    var findOptions *options.FindOptions = options.Find()

    // set sort to sort the blog data by createdAt
    // the recently created blog will be displayed first
    findOptions.SetSort(bson.D{{Key: "createdAt", Value: -1}})

  // get all blog data from the database
    cursor, err := database.GetCollection(BLOG_COLLECTION).Find(context.TODO(), query, findOptions)

  // if the operation failed, return an empty slice
    if err != nil {
        return []*model.Blog{}
    }

  // create a variable to store all blog data
    var blogs []*model.Blog = make([]*model.Blog, 0)

  // iterate through all the blog data
  // each blog data is inserted into the "blogs" variable
    if err := cursor.All(context.TODO(), &blogs); err != nil {
        return []*model.Blog{}
    }

  // return all blog data from the database
    return blogs
}