[main] Updated models according to new database structure

src/models/author.py

@@ -1,4 +1,4 @@
-from sqlalchemy import Column, Integer, String
+from sqlalchemy import Column, Integer, String, TIMESTAMP, UniqueConstraint
 from sqlalchemy.orm import relationship
 from sqlalchemy.ext.declarative import declarative_base
 
@@ -9,9 +9,9 @@ Base = declarative_base()
 
 class Author(Base):
     __tablename__  = 'author'
+    __table_args__ = (UniqueConstraint('id'),)
 
-    id = Column(Integer, primary_key=True, autoincrement=True)
+    id           = Column(Integer, primary_key=True)
     first_name   = Column(String(50), nullable=False)
     last_name    = Column(String(50), nullable=False)
-
+    last_updated = Column(TIMESTAMP, nullable=False, default='CURRENT_TIMESTAMP()')
-    books = relationship('Book', back_populates='author')

src/models/book.py

@@ -1,4 +1,6 @@
-from sqlalchemy import Column, Integer, String, TIMESTAMP, Text, ForeignKey, Enum
+import enum
+
+from sqlalchemy import Column, Integer, String, TIMESTAMP, Text, ForeignKey, Enum, UniqueConstraint
 from sqlalchemy.orm import relationship
 from sqlalchemy.ext.declarative import declarative_base
 
@@ -8,21 +10,23 @@ from .book_category import BookCategory
 Base = declarative_base()
 
 
+class BookStatusEnum(enum.Enum):
+    available = 'available'
+    borrowed = 'borrowed'
+    reserved = 'reserved'
+
 class Book(Base):
     __tablename__  = 'book'
+    __table_args__ = (UniqueConstraint('isbn'),)
 
-    id = Column(Integer, primary_key=True, autoincrement=True)
+    id             = Column(Integer, primary_key=True)
-    author_id = Column(Integer, ForeignKey(
+    author_id      = Column(Integer, ForeignKey('author.id'), nullable=False)
-        'author.id'), nullable=False, index=True)
     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('available', 'borrowed', 'reserved'),
+    status         = Column(Enum(BookStatusEnum), nullable=False, default=BookStatusEnum.available)
-                    nullable=False, default='available')
+    created_at     = Column(TIMESTAMP, nullable=False, default='CURRENT_TIMESTAMP()')
-    created_at = Column(TIMESTAMP, nullable=True, default="CURRENT_TIMESTAMP")
+    last_updated   = Column(TIMESTAMP, nullable=False, default='CURRENT_TIMESTAMP()')
 
-    author = relationship('Author', back_populates='books')
+    author = relationship('Author', backref='books')
-    # loans = relationship('Loan', back_populates='book')
-    categories = relationship(
-        'BookCategory', secondary='book_category_link', back_populates='books')

src/models/book_category.py

@@ -1,5 +1,5 @@
 from .book import Book
-from sqlalchemy import Column, Integer, String, TIMESTAMP, Text, ForeignKey, Enum
+from sqlalchemy import Column, Integer, String, TIMESTAMP, ForeignKey, UniqueConstraint
 from sqlalchemy.orm import relationship
 from sqlalchemy.ext.declarative import declarative_base
 
@@ -8,12 +8,12 @@ Base = declarative_base()
 
 class BookCategory(Base):
     __tablename__  = 'book_category'
+    __table_args__ = (UniqueConstraint('name'),)
 
-    id = Column(Integer, primary_key=True, autoincrement=True)
+    id                 = Column(Integer, primary_key=True)
-    parent_category_id = Column(Integer, ForeignKey(
+    parent_category_id = Column(Integer, ForeignKey('book_category.id'), nullable=True)
-        'book_category.id'), nullable=True, index=True)
+    name               = Column(String(100), nullable=False)
-    name = Column(String(100), nullable=False, unique=True)
+    mature_content     = Column(Integer, nullable=False, default=0)
+    last_updated       = Column(TIMESTAMP, nullable=False, default='CURRENT_TIMESTAMP()')
 
     parent_category = relationship('BookCategory', remote_side=[id])
-    books = relationship(
-        'Book', secondary='book_category_link', back_populates='categories')

src/models/book_category_link.py

@@ -1,10 +1,18 @@
 from sqlalchemy import Column, Integer, ForeignKey
+from sqlalchemy.orm import relationship
 from sqlalchemy.ext.declarative import declarative_base
 
+
+from .book import Book
+from .book_category import BookCategory
+
 Base = declarative_base()
 
 class BookCategoryLink(Base):
     __tablename__ = 'book_category_link'
 
-    book_id = Column(Integer, ForeignKey('book.id'), primary_key=True, index=True)
+    book_id          = Column(Integer, ForeignKey('book.id'), primary_key=True)
-    book_category_id = Column(Integer, ForeignKey('book_category.id'), primary_key=True, index=True)
+    book_category_id = Column(Integer, ForeignKey('book_category.id'), primary_key=True)
+
+    book          = relationship('Book', backref='categories')
+    book_category = relationship('BookCategory', backref='books')

src/models/librarian.py

@@ -0,0 +1,32 @@
+import enum
+
+from sqlalchemy import Column, Integer, String, TIMESTAMP, Text, ForeignKey, Enum, UniqueConstraint
+from sqlalchemy.orm import relationship
+from sqlalchemy.ext.declarative import declarative_base
+
+
+Base = declarative_base()
+
+
+class LibrarianStatusEnum(enum.Enum):
+    active   = 'active'
+    inactive = 'inactive'
+
+class LibrarianRoleEnum(enum.Enum):
+    staff = 'staff'
+    admin = 'admin'
+
+
+class Librarian(Base):
+    __tablename__  = 'librarian'
+    __table_args__ = (UniqueConstraint('id'),)
+
+    id           = Column(Integer, primary_key=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()')
+    status       = Column(Enum(LibrarianStatusEnum), nullable=False, default=LibrarianStatusEnum.active)
+    role         = Column(Enum(LibrarianRoleEnum), nullable=False)
+    last_updated = Column(TIMESTAMP, nullable=False, default='CURRENT_TIMESTAMP()')

src/models/loan.py

@@ -0,0 +1,38 @@
+import enum
+
+from sqlalchemy import Column, Integer, String, TIMESTAMP, Text, ForeignKey, Enum, UniqueConstraint, Float
+from sqlalchemy.orm import relationship
+from sqlalchemy.ext.declarative import declarative_base
+
+from .book import Book
+from .member import Member
+from .librarian import Librarian
+
+Base = declarative_base()
+
+
+class LoanStatusEnum(enum.Enum):
+    borrowed = 'borrowed'
+    returned = 'returned'
+    overdue  = 'overdue'
+    reserved = 'reserved'
+
+
+class Loan(Base):
+    __tablename__  = 'loan'
+    __table_args__ = (UniqueConstraint('id'),)
+
+    id           = Column(Integer, primary_key=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()')
+    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()')
+
+    book      = relationship('Book', backref='loans')
+    member    = relationship('Member', backref='loans')
+    librarian = relationship('Librarian', backref='loans')

src/models/member.py

@@ -0,0 +1,24 @@
+import enum
+
+from sqlalchemy import Column, Integer, String, TIMESTAMP, Text, ForeignKey, Enum, UniqueConstraint
+from sqlalchemy.orm import relationship
+from sqlalchemy.ext.declarative import declarative_base
+
+class MemberStatusEnum(enum.Enum):
+    active = 'active'
+    inactive = 'inactive'
+
+Base = declarative_base()
+
+class Member(Base):
+    __tablename__  = 'member'
+    __table_args__ = (UniqueConstraint('id'),)
+
+    id            = Column(Integer, primary_key=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()')
+    status        = Column(Enum(MemberStatusEnum), nullable=True, default=MemberStatusEnum.active)
+    last_updated  = Column(TIMESTAMP, nullable=True)