我正在学习Python Flask，并跟随这门课程学习，这门课程教我用它构建一个RESTful API。
现在，我试图使用request.form通过它的'register'路径向用户请求信息（提交），然而在用Postman测试它的POST请求时，我得到的是 raise exceptions.BadRequestKeyError(key)werkzeug.exceptions.BadRequestKeyError。400坏请求。浏览器(或代理)发送了一个本服务器无法理解的请求.KeyError：'email'.
我看了其他的帖子，这里似乎也有类似的问题，但要么其中一些也包含了HTML（令人困惑！），要么提出的解决方案似乎建议使用.get()，我已经尝试过，但虽然它可以防止400的发生，但它绕过了任何表格填写（这不是我想要的）。
下面是相关的路线。
@app.route('/register', methods=['POST'])
def register():
email = request.form['email']
test = User.query.filter_by(email=email).first()
if test:
return jsonify(message='That email already exists.'), 409
else:
first_name = request.form['first_name']
last_name = request.form['last_name']
password = request.form['password']
user = User(first_name=first_name, last_name=last_name, email=email, password=password)
db.session.add(user)
db.session.commit()
return jsonify(message="User created successfully."), 201
以下是目前在这个文件中使用的所有代码；它被称为'app.py'（也有SQLAlchemy、OS、Flask Marshmallow）。
from flask import Flask, jsonify, request
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy import Column, Integer, String, Float
import os
from flask_marshmallow import Marshmallow
app = Flask(__name__)
basedir = os.path.abspath(os.path.dirname(__file__))
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + os.path.join(basedir, 'planets.db')
db = SQLAlchemy(app)
ma = Marshmallow(app)
@app.cli.command('db_create')
def db_create():
db.create_all()
print('Database created!')
@app.cli.command('db_drop')
def db_drop():
db.drop_all()
print('Database dropped!')
@app.cli.command('db_seed')
def db_seed():
mercury = Planet(planet_name='Mercury',
planet_type='Class D',
home_star='Sol',
mass=2.258e23,
radius=1516,
distance=35.98e6)
venus = Planet(planet_name='Venus',
planet_type='Class K',
home_star='Sol',
mass=4.867e24,
radius=3760,
distance=67.24e6)
earth = Planet(planet_name='Earth',
planet_type='Class M',
home_star='Sol',
mass=5.972e24,
radius=3959,
distance=92.96e6)
db.session.add(mercury)
db.session.add(venus)
db.session.add(earth)
test_user = User(first_name='William',
last_name='Herschel',
email='[email protected]',
password='P@ssw0rd')
db.session.add(test_user)
db.session.commit()
print('Database seeded!')
@app.route('/')
def hello_world():
return 'Hello World!'
@app.route('/super_simple')
def super_simple():
return jsonify(message='Hello from the Planetary API.'), 200
@app.route('/not_found')
def not_found():
return jsonify(message='That resource was not found'), 404
@app.route('/parameters')
def parameters():
name = request.args.get('name')
age = int(request.args.get('age'))
if age < 18:
return jsonify(message="Sorry " + name + ", you are not old enough."), 401
else:
return jsonify(message="Welcome " + name + ", you are old enough!")
@app.route('/url_variables/<string:name>/<int:age>')
def url_variables(name: str, age: int):
if age < 18:
return jsonify(message="Sorry " + name + ", you are not old enough."), 401
else:
return jsonify(message="Welcome " + name + ", you are old enough!")
@app.route('/planets', methods=['GET'])
def planets():
planets_list = Planet.query.all()
result = planets_schema.dump(planets_list)
return jsonify(result.data)
@app.route('/register', methods=['POST'])
def register():
email = request.form['email']
test = User.query.filter_by(email=email).first()
if test:
return jsonify(message='That email already exists.'), 409
else:
first_name = request.form['first_name']
last_name = request.form['last_name']
password = request.form['password']
user = User(first_name=first_name, last_name=last_name, email=email, password=password)
db.session.add(user)
db.session.commit()
return jsonify(message="User created successfully."), 201
# database models
class User(db.Model):
__tablename__ = 'users'
id = Column(Integer, primary_key=True)
first_name = Column(String)
last_name = Column(String)
email = Column(String, unique=True)
password = Column(String)
class Planet(db.Model):
__tablename__ = 'planets'
planet_id = Column(Integer, primary_key=True)
planet_name = Column(String)
planet_type = Column(String)
home_star = Column(String)
mass = Column(Float)
radius = Column(Float)
distance = Column(Float)
class UserSchema(ma.Schema):
class Meta:
fields = ('id', 'first_name', 'last_name', 'email', 'password')
class PlanetSchema(ma.Schema):
class Meta:
fields = ('planet_id', 'planet_name', 'planet_type', 'home_star', 'mass', 'radius', 'distance')
user_schema = UserSchema()
users_schema = UserSchema(many=True)
planet_schema = PlanetSchema()
planets_schema = PlanetSchema(many=True)
if __name__ == '__main__':
app.run()
任何关于为什么会发生这个错误的见解，以及我如何能在允许用户输入电子邮件、名字等字段的同时修复它，都将被感激不尽！。
先谢谢你。
A BadRequest 当你试图从请求中访问一个对象或字段时，当客户端没有发送请求中的字段时，就会产生错误。
看来你在postman请求中犯了错。另外，请确保像这样访问它request.form['']