flask_sqlalchemy无法返回所有行

如何解决flask_sqlalchemy无法返回所有行

当我尝试将GET请求发送到“ http：// {{MY IP}}：5000 / alldocuments”时，出现错误。我正在关注youtube视频教程，甚至github上的直接示例也无法正常工作。所有其他路线均有效，但我无法使该路线正常工作。我在SQLAlchemy的文档中找不到我的答案，但也许我只是想念它。我不知道怎么了？我正在传递带有附加数据的结果对象。

我正在youtube上观看此视频：https://www.youtube.com/watch?v=PTZiDnuC86g

这是带有教程完整代码的github： https://github.com/bradtraversy/flask_sqlalchemy_rest

我收到此错误：

<!--

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/flask/app.py",line 2309,in __call__
    return self.wsgi_app(environ,start_response)
  File "/usr/lib/python3/dist-packages/flask/app.py",line 2295,in wsgi_app
    response = self.handle_exception(e)
  File "/home/pi/.local/lib/python3.7/site-packages/flask_restful/__init__.py",line 272,in error_router
    return original_handler(e)
  File "/usr/lib/python3/dist-packages/flask/app.py",line 1741,in handle_exception
    reraise(exc_type,exc_value,tb)
  File "/usr/lib/python3/dist-packages/flask/_compat.py",line 35,in reraise
    raise value
  File "/usr/lib/python3/dist-packages/flask/app.py",line 2292,in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/lib/python3/dist-packages/flask/app.py",line 1815,in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/pi/.local/lib/python3.7/site-packages/flask_restful/__init__.py",line 1718,in handle_user_exception
    reraise(exc_type,line 1813,in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/lib/python3/dist-packages/flask/app.py",line 1799,in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/pi/GotangoDocs/Backend/server.py",line 76,in get_documents
    return jsonify(result.data)
AttributeError: 'list' object has no attribute 'data'

-->

请参阅下面的完整代码：

from flask import Flask,request,jsonify
from flask_sqlalchemy import SQLAlchemy 
from flask_marshmallow import Marshmallow
from flask_restful import Resource,Api
import os
from datetime import datetime

# Init app
app = Flask(__name__)
basedir = os.path.abspath(os.path.dirname(__file__))
# Database
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + os.path.join(basedir,'db.sqlite')
# Init db
db = SQLAlchemy(app)
# Init ma
ma = Marshmallow(app)

# --- Document Route ---

# Document Class/Model
class Document(db.Model):
  id = db.Column(db.Integer,primary_key=True,autoincrement=True)
  name = db.Column(db.String(100),unique=True)
  description = db.Column(db.String(200))
  location = db.Column(db.String(200))
  date_created = db.Column(db.DateTime,default=datetime.now)

  def __init__(self,name,description,location,date_created):
    self.name = name
    self.description = description
    self.location = location
    self.date_created = date_created

# Document Schema
class DocumentSchema(ma.Schema):
  class Meta:
    fields = ('id','name','description','location','date_created')

# Init schema
document_schema = DocumentSchema()
documents_schema = DocumentSchema(many=True)

# Create a Document
@app.route('/document',methods=['POST'])
def add_document():
  name = request.json['name']
  description = request.json['description']
  location = request.json['location']

  new_document = Document(name,location)

  db.session.add(new_document)
  db.session.commit()

  return document_schema.jsonify(new_document)

# Get All Documents
@app.route('/alldocuments',methods=['GET'])
def get_documents():
  all_documents = Document.query.all()
  result = documents_schema.dump(all_documents)
  return jsonify(result.data)

# Get Single Document
@app.route('/documentById/<id>',methods=['GET'])
def get_document(id):
  document = Document.query.get(id)
  return document_schema.jsonify(document)

# Update a Document
@app.route('/documentById/<id>',methods=['PUT'])
def update_document(id):
  document = Document.query.get(id)

  name = request.json['name']
  description = request.json['description']
  location = request.json['location']
  date_created = request.json['date_created']

  document.name = name
  document.description = description
  document.location = location
  document.date_created = date_created

  db.session.commit()

  return document_schema.jsonify(document)

# Delete Document
@app.route('/document/<id>',methods=['DELETE'])
def delete_document(id):
  document = Document.query.get(id)
  db.session.delete(document)
  db.session.commit()

  return document_schema.jsonify(document)
# Run Server
if __name__ == '__main__':
  app.run(debug=True,host='0.0.0.0')

解决方法

第76行应为：

return jsonify(result)

代替：

return jsonify(result.data)