94 lines
2.3 KiB
Go
94 lines
2.3 KiB
Go
package models
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/**
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::USAGE::
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Erwatet ein Struct mit einem Buch.
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Wenn dieses Struct einen Publisher in Book.Publisher enthält und dieser existiert, wird diese
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ID verwendet. Wenn die ID nicht existiert oder 0 ist, wird geguckt, ob der Publisher unter
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Book.PublisherFull bereits existtiert (über die ID), ist das nicht der Fall, wird er in
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die Datenbank eingetragen und mit dem Buch verknüpft.
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Bei den Autoren wird ebenfalls überprüft, ob sie bereits existieren, wenn dem nicht so ist werden
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sie in die Datenbank eingetragen und mit dem Buch verknüpft.
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*/
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// AddBook adds a new book, it takes a book struct with author and publisher. Inserts them if they don't already exist
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func AddBook(book Book) (newBook Book, err error) {
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// Take Publisher, check if it exists. If not, insert it
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exists := false
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publisherid := book.Publisher
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if publisherid == 0 {
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if book.PublisherFull.ID != 0 {
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publisherid = book.PublisherFull.ID
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}
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}
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_, exists, err = GetPublisherByID(book.Publisher)
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if err != nil {
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return Book{}, err
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}
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if !exists {
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bookToBeInserted := new(Publisher)
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bookToBeInserted.Name = book.PublisherFull.Name
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_, err = x.Insert(bookToBeInserted)
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if err != nil {
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return Book{}, err
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}
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book.Publisher = bookToBeInserted.ID
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}
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// Insert the Book
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_, err = x.Insert(&book)
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if err != nil {
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return Book{}, err
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}
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// Take the authors, look if they exist, if they don't create them
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authorBookRelation := make([]AuthorBook, 0)
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for _, author := range book.Authors {
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_, exists, err := GetAuthorByID(author.ID)
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if err != nil {
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return Book{}, err
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}
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if !exists {
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// We have to insert authors on this inperformant way, because we need the ne ids afterwards
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authorToBeInserted := new(Author)
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authorToBeInserted.Forename = author.Forename
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authorToBeInserted.Lastname = author.Lastname
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_, err := x.Insert(authorToBeInserted)
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if err != nil {
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return Book{}, err
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}
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author.ID = authorToBeInserted.ID
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}
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// Prepare new author Relateion
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authorBookRelation = append(authorBookRelation, AuthorBook{BookID: book.ID, AuthorID: author.ID})
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}
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// Insert the connection between the author and the book
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_, err = x.Insert(&authorBookRelation)
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if err != nil {
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return Book{}, err
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}
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// Get the newly inserted book
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newBook, _, err = GetBookById(book.ID)
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return newBook, err
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}
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