Добавляем так же в вывод связанную информацию

src/repository/authorrepository.cpp

@@ -0,0 +1,81 @@
+#include "authorrepository.h"
+
+#include <model/books/author_book_s-odb.hxx>
+#include <model/books/author_book_s.h>
+#include <model/books/author_s-odb.hxx>
+#include <model/books/author_s.h>
+#include <model/books/book_s-odb.hxx>
+#include <model/books/book_s.h>
+
+#include <odb/core.hxx>
+#include <odb/database.hxx>
+#include <odb/query.hxx>
+
+namespace repository
+{
+
+AuthorRepository::AuthorRepository(odb::core::database& db) :
+    m_db(db)
+{}
+
+QVector<Author_S> AuthorRepository::findAll()
+{
+    odb::transaction t(m_db.begin());
+    odb::result<Author_S> res(m_db.query<Author_S>());
+
+    QVector<Author_S> authors;
+
+    for (auto it = res.begin(); it != res.end(); ++it)
+    {
+        const auto& author = *it;
+        authors.push_back(author);
+    }
+
+    t.commit();
+
+    return authors;
+}
+
+Author_S AuthorRepository::findById(int id)
+{
+    odb::transaction t(m_db.begin());
+    odb::result<Author_S> res(m_db.query<Author_S>(odb::query<Author_S>::id == id));
+
+    Author_S author;
+    res.value(author);
+
+    t.commit();
+
+    return author;
+}
+
+QVector<Author_S> AuthorRepository::findByBook(const int& bookId)
+{
+    odb::transaction t(m_db.begin());
+
+    QVector<Author_S> authors;
+
+    using ABQuery = odb::query<AuthorBook_S>;
+    using ABResult = odb::result<AuthorBook_S>;
+    ABResult abResult(m_db.query<AuthorBook_S>(ABQuery::book == bookId));
+
+    for (const AuthorBook_S& ab : abResult)
+    {
+        // Загружаем каждую книгу по ID
+        SH<Author_S> author(m_db.load<Author_S>(ab.author()->id()));
+        authors.push_back(*author.data());
+    }
+    t.commit();
+
+    return authors;
+}
+
+QVector<Author_S> AuthorRepository::findByBook(const QString& book_name)
+{
+    odb::transaction t(m_db.begin());
+    auto book_s = m_db.query<Book_S>(odb::query<Book_S>::title == book_name).one();
+
+    return findByBook(book_s->id());
+}
+
+} // namespace repository