Bugfix: when editing a book, all authors passed had been inserted again

models/author.go

@@ -39,6 +39,7 @@ func GetAuthorByID(id int64) (author Author, exists bool, err error) {
 // GetAuthorsByBook get all authors of a book
 func GetAuthorsByBook(bookID int64) (authors []Author, err error) {
 	err = x.
+		Select("authors.*").
 		Table("authors_books").
 		Join("INNER", "authors", "authors_books.author_id = authors.id").
 		Where("book_id = ?", bookID).

models/authors_add.go

@@ -9,7 +9,7 @@ func AddAuthor(author Author) (newAuthor Author, err error) {
 	}
 
 	// Get the newly inserted author
-	newAuthor, _, err = GetAuthorByID(author.ID)
+	newAuthor = author
 
 	return newAuthor, err
 }

models/books_add_update.go

@@ -69,6 +69,9 @@ func AddOrUpdateBook(book Book) (newBook Book, err error) {
 		return Book{}, err
 	}
 
+	// Delete all (maybe) previously existing author relations
+	x.Delete(AuthorBook{BookID:book.ID})
+
 	// Take the authors, look if they exist, if they don't create them
 	authorBookRelation := make([]AuthorBook, 0)
 
@@ -82,19 +85,16 @@ func AddOrUpdateBook(book Book) (newBook Book, err error) {
 		if !exists {
 
 			// We have to insert authors on this inperformant way, because we need the ne ids afterwards
-			authorToBeInserted := new(Author)
-			authorToBeInserted.Forename = author.Forename
-			authorToBeInserted.Lastname = author.Lastname
-			_, err := x.Insert(authorToBeInserted)
+			insertedAuthor, err := AddAuthor(author)
 
 			if err != nil {
 				return Book{}, err
 			}
 
-			author.ID = authorToBeInserted.ID
+			author.ID = insertedAuthor.ID
 		}
 
-		// Prepare new author Relateion
+		// Prepare new author Relation
 		authorBookRelation = append(authorBookRelation, AuthorBook{BookID: book.ID, AuthorID: author.ID})
 	}