Добавление выдач

library_service/models/db/book.py

@@ -5,6 +5,7 @@ from sqlmodel import Field, Relationship
 
 from library_service.models.dto.book import BookBase
 from library_service.models.db.links import AuthorBookLink, GenreBookLink
+from library_service.models.enums import BookStatus
 
 if TYPE_CHECKING:
     from .author import Author
@@ -14,9 +15,11 @@ if TYPE_CHECKING:
 class Book(BookBase, table=True):
     """Модель книги в базе данных"""
     id: int | None = Field(default=None, primary_key=True, index=True)
+    status: BookStatus = Field(default=BookStatus.ACTIVE)
     authors: List["Author"] = Relationship(
         back_populates="books", link_model=AuthorBookLink
     )
     genres: List["Genre"] = Relationship(
         back_populates="books", link_model=GenreBookLink
     )
+    loans: List["BookUserLink"] = Relationship(sa_relationship_kwargs={"cascade": "all, delete"})

library_service/models/db/links.py

@@ -1,4 +1,5 @@
 """Модуль связей между сущностями в БД"""
+from datetime import datetime
 from sqlmodel import SQLModel, Field
 
 
@@ -22,3 +23,20 @@ class UserRoleLink(SQLModel, table=True):
 
     user_id: int | None = Field(default=None, foreign_key="users.id", primary_key=True)
     role_id: int | None = Field(default=None, foreign_key="roles.id", primary_key=True)
+
+
+class BookUserLink(SQLModel, table=True):
+    """
+    Модель истории выдачи книг (Loan).
+    Связывает книгу и пользователя с фиксацией времени.
+    """
+    __tablename__ = "book_loans"
+
+    id: int | None = Field(default=None, primary_key=True, index=True)
+    
+    book_id: int = Field(foreign_key="book.id")
+    user_id: int = Field(foreign_key="users.id")
+    
+    borrowed_at: datetime = Field(default_factory=datetime.utcnow)
+    due_date: datetime
+    returned_at: datetime | None = Field(default=None)

library_service/models/db/user.py

@@ -26,3 +26,4 @@ class User(UserBase, table=True):
 
     # Связи
     roles: List["Role"] = Relationship(back_populates="users", link_model=UserRoleLink)
+    loans: List["BookUserLink"] = Relationship(sa_relationship_kwargs={"cascade": "all, delete"})