[main] Updated models and their initialization

src/models/__init__.py

@@ -0,0 +1,7 @@
+from .author import Author
+from .book_category import BookCategory
+from .book import Book
+from .book_category_link import BookCategoryLink
+from .member import Member
+from .librarian import Librarian
+from .loan import Loan

src/models/author.py

@@ -1,9 +1,7 @@
-from sqlalchemy import Column, Integer, String, TIMESTAMP, UniqueConstraint
+from sqlalchemy import Column, Integer, String, TIMESTAMP, UniqueConstraint, func
 from sqlalchemy.orm import relationship
 from sqlalchemy.ext.declarative import declarative_base
 
-from .book import Book
-
 Base = declarative_base()
 
 
@@ -11,7 +9,7 @@ class Author(Base):
     __tablename__  = 'author'
     __table_args__ = (UniqueConstraint('id'),)
 
-    id           = Column(Integer, primary_key=True)
+    id           = Column(Integer, primary_key=True, autoincrement=True)
     first_name   = Column(String(50), nullable=False)
     last_name    = Column(String(50), nullable=False)
-    last_updated = Column(TIMESTAMP, nullable=False, default='CURRENT_TIMESTAMP()')
+    last_updated = Column(TIMESTAMP, nullable=False, server_default=func.now())

src/models/book.py

@@ -1,6 +1,6 @@
 import enum
 
-from sqlalchemy import Column, Integer, String, TIMESTAMP, Text, ForeignKey, Enum, UniqueConstraint
+from sqlalchemy import Column, Integer, String, TIMESTAMP, Text, ForeignKey, Enum, UniqueConstraint, func
 from sqlalchemy.orm import relationship
 from sqlalchemy.ext.declarative import declarative_base
 
@@ -19,14 +19,14 @@ class Book(Base):
     __tablename__  = 'book'
     __table_args__ = (UniqueConstraint('isbn'),)
 
-    id             = Column(Integer, primary_key=True)
+    id             = Column(Integer, primary_key=True, autoincrement=True)
     author_id      = Column(Integer, ForeignKey('author.id'), nullable=False)
     title          = Column(String(100), nullable=False)
     description    = Column(Text, nullable=False)
     year_published = Column(String(4), nullable=False)
     isbn           = Column(String(13), nullable=False, unique=True)
     status         = Column(Enum(BookStatusEnum), nullable=False, default=BookStatusEnum.available)
-    created_at     = Column(TIMESTAMP, nullable=False, default='CURRENT_TIMESTAMP()')
+    created_at     = Column(TIMESTAMP, nullable=False, server_default=func.now())
-    last_updated   = Column(TIMESTAMP, nullable=False, default='CURRENT_TIMESTAMP()')
+    last_updated   = Column(TIMESTAMP, nullable=False, server_default=func.now())
 
     author = relationship('Author', backref='books')

src/models/book_category.py

@@ -1,5 +1,4 @@
-from .book import Book
+from sqlalchemy import Column, Integer, String, TIMESTAMP, ForeignKey, UniqueConstraint, func
-from sqlalchemy import Column, Integer, String, TIMESTAMP, ForeignKey, UniqueConstraint
 from sqlalchemy.orm import relationship
 from sqlalchemy.ext.declarative import declarative_base
 
@@ -10,10 +9,10 @@ class BookCategory(Base):
     __tablename__  = 'book_category'
     __table_args__ = (UniqueConstraint('name'),)
 
-    id                 = Column(Integer, primary_key=True)
+    id                 = Column(Integer, primary_key=True, autoincrement=True)
     parent_category_id = Column(Integer, ForeignKey('book_category.id'), nullable=True)
     name               = Column(String(100), nullable=False)
     mature_content     = Column(Integer, nullable=False, default=0)
-    last_updated       = Column(TIMESTAMP, nullable=False, default='CURRENT_TIMESTAMP()')
+    last_updated       = Column(TIMESTAMP, nullable=False, server_default=func.now())
 
     parent_category = relationship('BookCategory', remote_side=[id])

src/models/librarian.py

@@ -1,6 +1,6 @@
 import enum
 
-from sqlalchemy import Column, Integer, String, TIMESTAMP, Text, ForeignKey, Enum, UniqueConstraint
+from sqlalchemy import Column, Integer, String, TIMESTAMP, Text, ForeignKey, Enum, UniqueConstraint, func
 from sqlalchemy.orm import relationship
 from sqlalchemy.ext.declarative import declarative_base
 
@@ -21,12 +21,12 @@ class Librarian(Base):
     __tablename__  = 'librarian'
     __table_args__ = (UniqueConstraint('id'),)
 
-    id           = Column(Integer, primary_key=True)
+    id           = Column(Integer, primary_key=True, autoincrement=True)
     first_name   = Column(String(50), nullable=False)
     last_name    = Column(String(50), nullable=False)
     email        = Column(String(100), nullable=False, unique=True)
     phone        = Column(String(20), nullable=False)
-    hire_date    = Column(TIMESTAMP, nullable=False, default='CURRENT_TIMESTAMP()')
+    hire_date    = Column(TIMESTAMP, nullable=False, server_default=func.now())
     status       = Column(Enum(LibrarianStatusEnum), nullable=False, default=LibrarianStatusEnum.active)
     role         = Column(Enum(LibrarianRoleEnum), nullable=False)
-    last_updated = Column(TIMESTAMP, nullable=False, default='CURRENT_TIMESTAMP()')
+    last_updated = Column(TIMESTAMP, nullable=False, server_default=func.now())

src/models/loan.py

@@ -1,6 +1,6 @@
 import enum
 
-from sqlalchemy import Column, Integer, String, TIMESTAMP, Text, ForeignKey, Enum, UniqueConstraint, Float
+from sqlalchemy import Column, Integer, String, TIMESTAMP, Text, ForeignKey, Enum, UniqueConstraint, Float, func
 from sqlalchemy.orm import relationship
 from sqlalchemy.ext.declarative import declarative_base
 
@@ -22,16 +22,16 @@ class Loan(Base):
     __tablename__  = 'loan'
     __table_args__ = (UniqueConstraint('id'),)
 
-    id           = Column(Integer, primary_key=True)
+    id           = Column(Integer, primary_key=True, autoincrement=True)
     book_id      = Column(Integer, ForeignKey('book.id'), nullable=False)
     member_id    = Column(Integer, ForeignKey('member.id'), nullable=False)
     librarian_id = Column(Integer, ForeignKey('librarian.id'), nullable=False)
-    loan_date    = Column(TIMESTAMP, nullable=False, default='CURRENT_TIMESTAMP()')
+    loan_date    = Column(TIMESTAMP, nullable=False, server_default=func.now())
     due_date     = Column(TIMESTAMP, nullable=False)
     return_date  = Column(TIMESTAMP, nullable=True)
     status       = Column(Enum(LoanStatusEnum), nullable=False, default=LoanStatusEnum.borrowed)
     overdue_fee  = Column(Float, nullable=True)
-    last_updated = Column(TIMESTAMP, nullable=False, default='CURRENT_TIMESTAMP()')
+    last_updated = Column(TIMESTAMP, nullable=False, server_default=func.now())
 
     book      = relationship('Book', backref='loans')
     member    = relationship('Member', backref='loans')

src/models/member.py

@@ -1,6 +1,6 @@
 import enum
 
-from sqlalchemy import Column, Integer, String, TIMESTAMP, Text, ForeignKey, Enum, UniqueConstraint
+from sqlalchemy import Column, Integer, String, TIMESTAMP, Text, ForeignKey, Enum, UniqueConstraint, func
 from sqlalchemy.orm import relationship
 from sqlalchemy.ext.declarative import declarative_base
 
@@ -14,11 +14,11 @@ class Member(Base):
     __tablename__  = 'member'
     __table_args__ = (UniqueConstraint('id'),)
 
-    id            = Column(Integer, primary_key=True)
+    id            = Column(Integer, primary_key=True, autoincrement=True)
     first_name    = Column(String(50), nullable=False)
     last_name     = Column(String(50), nullable=False)
     email         = Column(String(100), nullable=False, unique=True)
     phone         = Column(String(20), nullable=True)
-    register_date = Column(TIMESTAMP, nullable=True, default='CURRENT_TIMESTAMP()')
+    register_date = Column(TIMESTAMP, nullable=True, server_default=func.now())
     status        = Column(Enum(MemberStatusEnum), nullable=True, default=MemberStatusEnum.active)
     last_updated  = Column(TIMESTAMP, nullable=True)