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with-extra-data-3.py
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with-extra-data-3.py
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"""
FastAPI app called 'Bookipedia' that serves information about books and their authors. A simple example of a
"many-to-many" relationship *with* extra data. This solution uses a custom pydantic GetterDict
"""
from sqlalchemy import create_engine, Column, Integer, String, ForeignKey
from sqlalchemy.orm import declarative_base, relationship, joinedload
# Make the engine
engine = create_engine("sqlite+pysqlite:///:memory:", future=True, echo=True,
connect_args={"check_same_thread": False})
# Make the DeclarativeMeta
Base = declarative_base()
# Declare Classes / Tables
class BookAuthor(Base):
__tablename__ = 'book_authors'
book_id = Column(ForeignKey('books.id'), primary_key=True)
author_id = Column(ForeignKey('authors.id'), primary_key=True)
blurb = Column(String, nullable=False)
book = relationship("Book", back_populates="authors")
author = relationship("Author", back_populates="books")
class Book(Base):
__tablename__ = 'books'
id = Column(Integer, primary_key=True)
title = Column(String, nullable=False)
authors = relationship("BookAuthor", back_populates="book")
class Author(Base):
__tablename__ = 'authors'
id = Column(Integer, primary_key=True)
name = Column(String, nullable=False)
books = relationship("BookAuthor", back_populates="author")
# Create the tables in the database
Base.metadata.create_all(engine)
# Insert data
from sqlalchemy.orm import Session
with Session(bind=engine) as session:
book1 = Book(title="Dead People Who'd Be Influencers Today")
book2 = Book(title="How To Make Friends In Your 30s")
author1 = Author(name="Blu Renolds")
author2 = Author(name="Chip Egan")
author3 = Author(name="Alyssa Wyatt")
session.add_all([book1, book2, author1, author2, author3])
session.commit()
book_author1 = BookAuthor(book_id=book1.id, author_id=author1.id, blurb="Blue wrote chapter 1")
book_author2 = BookAuthor(book_id=book1.id, author_id=author2.id, blurb="Chip wrote chapter 2")
book_author3 = BookAuthor(book_id=book2.id, author_id=author1.id, blurb="Blue wrote chapters 1-3")
book_author4 = BookAuthor(book_id=book2.id, author_id=author3.id, blurb="Alyssa wrote chapter 4")
session.add_all([book_author1, book_author2, book_author3, book_author4])
session.commit()
from typing import List, Any
from pydantic import BaseModel
from pydantic.utils import GetterDict
class BookAuthorGetter(GetterDict):
def get(self, key: str, default: Any = None) -> Any:
if key in {'id', 'name'}:
return getattr(self._obj.author, key)
else:
return super(BookAuthorGetter, self).get(key, default)
class BookAuthorSchema(BaseModel):
id: int
name: str
blurb: str
class Config:
orm_mode = True
getter_dict = BookAuthorGetter
class BookSchema(BaseModel):
id: int
title: str
authors: List[BookAuthorSchema]
class Config:
orm_mode = True
class AuthorBookGetter(GetterDict):
def get(self, key: str, default: Any = None) -> Any:
if key in {'id', 'title'}:
return getattr(self._obj.book, key)
else:
return super(AuthorBookGetter, self).get(key, default)
class AuthorBookSchema(BaseModel):
id: int
title: str
blurb: str
class Config:
orm_mode = True
getter_dict = AuthorBookGetter
class AuthorSchema(BaseModel):
id: int
name: str
books: List[AuthorBookSchema]
class Config:
orm_mode = True
from fastapi import FastAPI, Depends
app = FastAPI(title="Bookipedia")
def get_db():
db = Session(bind=engine)
try:
yield db
finally:
db.close()
@app.get("/books/{id}", response_model=BookSchema)
async def get_book(id: int, db: Session = Depends(get_db)):
db_book = db.query(Book).options(
joinedload(Book.authors).options(
joinedload(BookAuthor.author)
)
).where(Book.id == id).one()
return db_book
@app.get("/books", response_model=List[BookSchema])
async def get_books(db: Session = Depends(get_db)):
db_books = db.query(Book).options(
joinedload(Book.authors).options(
joinedload(BookAuthor.author)
)
).all()
return db_books
@app.get("/authors/{id}", response_model=AuthorSchema)
async def get_author(id: int, db: Session = Depends(get_db)):
db_author = db.query(Author).options(
joinedload(Author.books).options(
joinedload(BookAuthor.book)
)
).where(Author.id == id).one()
return db_author
@app.get("/authors", response_model=List[AuthorSchema])
async def get_authors(db: Session = Depends(get_db)):
db_authors = db.query(Author).options(
joinedload(Author.books).options(
joinedload(BookAuthor.book)
)
).all()
return db_authors
import uvicorn
if __name__ == "__main__":
uvicorn.run(app, host="0.0.0.0", port=8000)