Python 用列表数据理解棉花糖嵌套模式
我是python新手,我是usign序列化。无法使用嵌套的scehma。 ,我的代码Python 用列表数据理解棉花糖嵌套模式,python,flask,marshmallow,Python,Flask,Marshmallow,我是python新手,我是usign序列化。无法使用嵌套的scehma。 ,我的代码 from sqlalchemy import Column, Float, Integer, String, Text, text,ForeignKey from sqlalchemy.ext.declarative import declarative_base from sqlalchemy.orm import relationship Base = declarative_base() metadat
from sqlalchemy import Column, Float, Integer, String, Text, text,ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship
Base = declarative_base()
metadata = Base.metadata
class CompanyDemo(Base):
__tablename__ = 'company_demo'
company_id = Column(Integer, primary_key=True,
server_default=text("nextval('company_demo_company_id_seq'::regclass)"))
name = Column(Text, nullable=False)
address = Column(String(50))
location = Column(String(50))
class UsersDemo(Base):
__tablename__ = 'users_demo'
id = Column(Integer, primary_key=True,
server_default=text("nextval('users_demo_id_seq'::regclass)"))
company_id = Column(Integer,ForeignKey('company_demo.company_id'), nullable=False)
email = Column(String)
company = relationship('CompanyDemo')
模式
from marshmallow import Schema, fields, pprint
class CompanySchema(Schema):
company_id = fields.Int(dump_only=True)
name = fields.Str()
address = fields.Str()
location = fields.Str()
class UserSchema(Schema):
email = fields.Str()
company = fields.Nested(CompanySchema)
user = UserSchema()
user = UserSchema(many=True)
company = CompanySchema()
company = CompanySchema(many=True)
还有我的烧瓶应用程序
from flask import Flask, jsonify, url_for, render_template
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from flask_sqlalchemy import SQLAlchemy
from model import CompanyDemo, UsersDemo
from schemas.userschema import user, company
app = Flask(__name__)
app.secret_key = "shiva"
def db_connect():
engine = create_engine('postgresql://ss@127.0.0.1:5432/test')
Session = sessionmaker(autocommit=False, autoflush=False, bind=engine)
# create a Session
session = Session()
session._model_changes = {}
return session
@app.route('/company', methods=["GET", "POST"])
def get_all_company():
db = db_connect()
allcompany = db.query(CompanyDemo).join(UsersDemo).all()
return jsonify(company.dump(allcompany, many=True).data) # company is marshmallow schema
if __name__ == '__main__':
app.run(host='0.0.0.0', port=15418, debug=True)
我的代码有问题吗?我面临嵌套模式的问题,无法在输出中获取嵌套数据
输出如下
[{
“地址”:“qqq”,
“公司id”:1,
“地点”:“www”,
“名称”:“eee”}{
“地址”:“www”,
“公司id”:2,
“位置”:“qqq”,
“名称”:“aaa”}]
使用内存中SQLite的自包含示例:
from flask import Flask, jsonify
from flask_sqlalchemy import SQLAlchemy
from marshmallow import Schema, fields, pprint
app = Flask(__name__)
app.config['DEBUG'] = True
app.config['SECRET_KEY'] = 'super-secret'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///:memory:'
app.config['SQLALCHEMY_ECHO'] = True
db = SQLAlchemy(app)
class CompanyDemo(db.Model):
__tablename__ = 'company_demo'
company_id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.Text, nullable=False)
address = db.Column(db.String(50))
location = db.Column(db.String(50))
def __unicode__(self):
return u"{name} ({address})".format(name=self.name, address=self.address)
class UsersDemo(db.Model):
__tablename__ = 'users_demo'
id = db.Column(db.Integer, primary_key=True,)
company_id = db.Column(db.Integer, db.ForeignKey('company_demo.company_id'), nullable=False)
company = db.relationship('CompanyDemo')
email = db.Column(db.String)
def __unicode__(self):
return u"{email}".format(email=self.email)
class CompanySchema(Schema):
company_id = fields.Int(dump_only=True)
name = fields.Str()
address = fields.Str()
location = fields.Str()
class UserSchema(Schema):
email = fields.Str()
company = fields.Nested(CompanySchema)
user_schema = UserSchema()
company_schema = CompanySchema()
@app.route('/')
def index():
return "<a href='/dump_company'>Dump Company</a><br><a href='/dump_user'>Dump User</a>"
@app.route('/dump_user')
def dump_user():
user = UsersDemo.query.first()
return jsonify(user_schema.dump(user).data)
@app.route('/dump_company')
def dump_company():
company = CompanyDemo.query.first()
return jsonify(company_schema.dump(company).data)
def build_db():
db.drop_all()
db.create_all()
company = CompanyDemo(name='Test 1', address='10 Downing Street', location='wherever')
db.session.add(company)
user = UsersDemo(email='fred@example.com', company=company)
db.session.add(user)
db.session.commit()
@app.before_first_request
def first_request():
build_db()
if __name__ == '__main__':
app.run(debug=True, port=7777)
从烧瓶导入烧瓶,jsonify
从flask_sqlalchemy导入sqlalchemy
从棉花糖导入模式,字段,pprint
app=烧瓶(名称)
app.config['DEBUG']=True
app.config['SECRET_KEY']='super SECRET'
app.config['SQLALCHEMY\u TRACK\u MODIFICATIONS']=False
app.config['SQLALCHEMY\u DATABASE\u URI']='sqlite://:memory:'
app.config['SQLALCHEMY_ECHO']=True
db=SQLAlchemy(应用程序)
类别CompanyDemo(数据库模型):
__tablename_uuu='company_udemo'
公司id=db.Column(db.Integer,主键=True)
name=db.Column(db.Text,null=False)
地址=db.Column(db.String(50))
位置=分贝列(分贝字符串(50))
def ___; unicode(自):
返回u“{name}({address})”格式(name=self.name,address=self.address)
类UsersDemo(db.Model):
__tablename_uuu='users\u demo'
id=db.Column(db.Integer,主键=True,)
company\u id=db.Column(db.Integer,db.ForeignKey('company\u demo.company\u id'),nullable=False)
company=db.relationship('CompanyDemo')
email=db.Column(db.String)
def ___; unicode(自):
返回u“{email}”。格式(email=self.email)
类别CompanySchema(模式):
公司id=fields.Int(dump\u only=True)
name=fields.Str()
address=fields.Str()
location=fields.Str()
类UserSchema(模式):
email=fields.Str()
company=字段。嵌套(CompanySchema)
user_schema=UserSchema()
公司模式=公司模式()
@应用程序路径(“/”)
def index():
返回“
”
@app.route(“/dump\u user”)
def dump_user():
user=UsersDemo.query.first()
返回jsonify(user_schema.dump(user.data))
@应用程序路径(“/dump_company”)
def dump_company():
company=CompanyDemo.query.first()
返回jsonify(company\u schema.dump(company.data))
def build_db():
db.drop_all()
db.create_all()
company=CompanyDemo(名称='test1',地址='唐宁街10',位置='where')
db.session.add(公司)
user=UsersDemo(email=)fred@example.com,company=company)
db.session.add(用户)
db.session.commit()
@第一次请求前的应用程序
def first_request():
build_db()
如果uuuu name uuuuuu='\uuuuuuu main\uuuuuuu':
运行(调试=True,端口=7777)
您对嵌套字段的声明错误。它应该是company=fields.Nested(CompanySchema)
对不起,我也尝试了company=fields.Nested(CompanySchema)。不走运!您已使用CompanyScheme
转储,但嵌套字段的是UserScheme
。