Book form: can now edit an existing book

internal/adapter/adapter.go

@@ -0,0 +1,63 @@
+package adapter
+
+import (
+	"errors"
+
+	"git.artlef.fr/bibliomane/internal/appcontext"
+	"git.artlef.fr/bibliomane/internal/dto"
+	"git.artlef.fr/bibliomane/internal/model"
+	"gorm.io/gorm"
+)
+
+func FillBookDbFromFields(ac appcontext.AppContext, fields *dto.BookFields, book *model.Book) error {
+	if fields.Title != nil {
+		book.Title = *fields.Title
+	}
+	if fields.ISBN != nil {
+		book.ISBN = *fields.ISBN
+	}
+	if fields.InventaireID != nil {
+		book.InventaireID = *fields.InventaireID
+	}
+	if fields.OpenLibraryId != nil {
+		book.OpenLibraryId = *fields.OpenLibraryId
+	}
+	if fields.ShortDescription != nil {
+		book.SmallDescription = *fields.ShortDescription
+	}
+	if fields.Summary != nil {
+		book.Summary = *fields.Summary
+	}
+	if fields.CoverID != nil {
+		book.CoverID = *fields.CoverID
+	}
+
+	if fields.Author != nil {
+		author, err := fetchOrCreateAuthor(ac, *fields.Author)
+		if err != nil {
+			return err
+		}
+		book.AuthorID = author.ID
+	}
+	return nil
+}
+
+func fetchOrCreateAuthor(ac appcontext.AppContext, name string) (*model.Author, error) {
+	var author model.Author
+	res := ac.Db.Where("name = ?", name).First(&author)
+	err := res.Error
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			author = model.Author{Name: name}
+			err = ac.Db.Save(&author).Error
+			if err != nil {
+				return &author, err
+			}
+			return &author, nil
+		} else {
+			return &author, err
+		}
+	} else {
+		return &author, nil
+	}
+}