0

これを if ブロックで実行すると:

first_query = db.GqlQuery("SELECT * FROM Contract ORDER BY date DESC").get()
    if first_query == None:
        numBook = 42
        numInitialPage = 42
        numFinalPage = 42
        first_record = Contract(book_number = 1, initial_page = 0, final_page = 0)
        first_record.put()
        contract = db.GqlQuery("SELECT * FROM Contract ORDER BY date DESC").get()
        numBook = contract.book_number
        numInitialPage = contract.final_page +1
        numFinalPage = numInitialPage
    else:
        contract = first_query
        numBook = first_query
        numInitialPage = 51
        numFinalPage = 51

プロシージャはifブロックにジャンプしますが、次のエラー メッセージが表示されます。

    File "C:\Users\CG\Documents\udacity\contract\main.py", line 88, in get
    numBook = contract.book_number
AttributeError: 'NoneType' object has no attribute 'book_number'

以前.put()はレコードを挿入し.get()てアクセスしていたのに、contract の値はなぜNoneですか?

助けてくれてありがとう！

ここにコード全体があります：

# -*- coding: utf-8 -*-
# -*- coding: utf-8 -*-
#!/usr/bin/env python
#
# Copyright 2007 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

import os

import webapp2

import jinja2

jinja_environment = jinja2.Environment(autoescape=True,
    loader=jinja2.FileSystemLoader(os.path.join(os.path.dirname(__file__), 'templates')))

import re

from google.appengine.ext import db

USER_RE = re.compile(r"^[a-zA-Z0-9_ -]{3,20}$")
def valid_person(person):
    return USER_RE.match(person)

PASS_RE = re.compile(r"^.{3,20}$")
def valid_SSN(SSN):
    return PASS_RE.match(SSN)

EMAIL_RE = re.compile(r"^[\S]+@[\S]+\.[\S]+$")
def valid_email(email):
    return EMAIL_RE.match(email)

import time

import datetime

def dateToday():
    today = datetime.datetime.today()
    todayDay = str(today.day)
    todayMonth = str(today.month)
    monthExt = {'1':' January ', '2':'February', '3':' March ', '4':'April', '5':'May', '6':'June', '7':' July ', '8':'August', '9':'September', '10':'October', '11':'November ', '12':'December'}
    todayYear = str(today.year)
    return(todayDay + ' of  ' + monthExt[todayMonth] + ' of ' + todayYear)

class Person(db.Model):
    firstName = db.StringProperty(required = True)
    nacionality = db.StringProperty(required = True)
    marital_status = db.StringProperty(required = True)
    profession = db.StringProperty(required = True)
    SSN = db.IntegerProperty(required = True)
    driver_license = db.IntegerProperty(required = True)
#    address = db.PostalAddress(required = False)

class Contract(db.Model):
  book_number = db.IntegerProperty(required = True)
  initial_page = db.IntegerProperty(required = True)
  final_page = db.IntegerProperty(required = True)
##  contrac_type = db.StringProperty(required = False, choices=set(["Purchase Agreement", "Rental House", "Rental Car"]))
##  contract_place = db.StringProperty(required = False)
##  contract_date = db.DateProperty (required = True, auto_now = True, auto_now_add = True)

class ContractingParty(db.Model):
  person = db.ReferenceProperty(Person, required=True, collection_name="party_to_contracts")
  condition = db.StringProperty(required = False, choices=set(["buyer", "seller", "renter", "owner", "witness"]))

class MainHandler(webapp2.RequestHandler):
    def get(self):
        first_query = db.GqlQuery("SELECT * FROM Contract ORDER BY date DESC").get()
        if first_query == None:
            numBook = 8
            numInitialPage = 8
            numFinalPage = 8
            first_record = Contract(book_number = 1, initial_page = 0, final_page = 0)
            first_record.put()
            contract = db.GqlQuery("SELECT * FROM Contract ORDER BY date DESC").get()
            numBook = contract.book_number
            numInitialPage = contract.final_page +1
            numFinalPage = numInitialPage
        else:
            contract = first_query
            numBook = first_query
            numInitialPage = 7
            numFinalPage = 7

##        numBook = contract.book_number
##        numInitialPage = contract.final_page +1
##        numFinalPage = numInitialPage
        template_values = {"person": "",
                                       "nacionality": "",
                                       "SSN": "",
                                       "driverLicense": "",
                                       "email":"",
                                       "person_error": "",
                                       "SSN_error": "",
                                       "driverLicense_error": "",
                                       "address": "",
                                       "email_error": "",
                                       "numBook": numBook,
                                       "numInitialPage": numInitialPage,
                                       "numFinalPage": numFinalPage,
                                       }
        template = jinja_environment.get_template('index.html')
        self.response.out.write(template.render(template_values))

    def post(self):
        person_name = self.request.get("person")
        user_nacionality = self.request.get('nacionality')
        user_profession = self.request.get('profession')
        user_maritalStatus = self.request.get('maritalStatus')
        user_SSN = self.request.get('SSN')
        user_email = self.request.get('email')
        user_driverLicense = self.request.get('driverLicense')
        person_error = ""
        SSN_error = ""
        driverLicense_error = ""
        geted_email_error = ""
        address = self.request.get('address')
        contractType = self.request.get("contractType")
        owner = self.request.get("owner")
        witness = self.request.get("witness")
        numBook = self.request.get("numBook")
        numInitialPage = self.request.get("numInitialPage")
        numFinalPage = self.request.get("numFinalPage")

        if (person_name and valid_person(person_name)) and (user_SSN and valid_SSN(user_SSN)) and ((not user_email) or (user_email and valid_email(user_email))):
            contract_record = Contract(book_number = numBook, initial_page = numInitialPage, final_page = numFinalPage)
            contract_record.put()
            contract_id = contract_record.key().id()
            person_record = Person(name = person_name,
                               nacionality = user_nacionality,
                               profession = user_profession,
                               marital_status = user_maritalStatus,
                               SSN = int(user_SSN),
                               driverLicense = int(user_driverLicense))
            person_record.put()
# HERE THE PROBLEM - Contracting party should be a table with ID refering to contract table
 #       contracting_party_record = ContractingParty(person = 1,  )
##            person = db.ReferenceProperty(People, required=True, collection_name="party_to_contracts")
##            condition = db.StringProperty(required = False, choices=set(["buyer", "seller", "renter", "owner", "witness"]))
##            self.redirect('/your_contract?person=%s&nacionality=%s&profession=%s&maritalStatus=%s&SSN=%s&driverLicense=%s&email=%s&witness=%s&owner=%s&contractType=%s&address=%s&numBook=%s&numInitialPage=%s&numFinalPage=%s' % (person_name, user_nacionality, user_profession, user_maritalStatus, user_SSN, user_driverLicense, user_email,
##witness, owner, contractType, address, numBook, numInitialPage, numFinalPage))
            self.redirect('/your_contract?person=%s' % contract_id)

        else:
            if not person_name or not valid_person(person_name):
                person_error = "Oh no!!! this person name isn't valid!"
            if not user_SSN or not valid_SSN(user_SSN):
                SSN_error = "Oh no!!! SSN isn't valid!"
            if user_email and not valid_email(user_email):
                geted_email_error = "Oh no!!! e-mail isn't valid!"
            template_values = {"person": person_name,
                                "nacionality": user_nacionality,
                                "maritalStatus": user_maritalStatus,
                                "profession": user_profession,
                                "SSN": user_SSN,
                                "driverLicense": user_driverLicense,
                                "email": user_email,
                                "person_error": person_error,
                                "SSN_error": SSN_error,
                                "driverLicense_error": user_driverLicense,
                                "address": address,
                                "email_error": geted_email_error}
            template = jinja_environment.get_template('index.html')
            self.response.out.write(template.render(template_values))

class your_contractHandler(webapp2.RequestHandler):
    def get(self):
        contract_id = self.request.get('contract_id')
        contract = db.GqlQuery("SELECT * FROM Contract WHERE __key__ = KEY('Model', contract_id").get()
##        SELECT * FROM Model where __key__ = KEY('Model', <numeric_id>)
        geted_numBook = contract.book_number
        geted_numInitialPage = contract.initial_page
        geted_numFinalPage = contract.final_page
        geted_dateToday = dateToday()
        geted_contractType = contract.contract_type

        person = db.GqlQuery("SELECT * FROM Person ORDER BY date DESC").get()
        geted_person_name = person.name
        geted_user_nacionality = person.nacionality
        geted_user_profession = person.profession
        geted_user_maritalStatus = person.marital_status
        geted_user_SSN = person.SSN
        geted_user_driver_license = person.driver_license


        your_contract = jinja_environment.get_template('your_contract.html')

        your_contract_values = {"person":geted_person_name,
                                "nacionality":geted_user_nacionality,
                                "maritalStatus": geted_user_marital_status,
                                "profession": geted_user_profession,
                                "SSN":geted_user_SSN,
                                "driverLicense":geted_user_driver_license,
                                "address":geted_address,
                                "email":geted_user_email,
                                "contractType":geted_contract_type,
                                "dateContract":geted_dateToday,
                                "numBook":geted_numBook,
                                "numInitialPage":geted_numInitialPage,
                                "numFinalPage":geted_numInitialPage,
                                }
        template = jinja_environment.get_template('index.html')
        self.response.out.write(your_contract.render(your_contract_values))


# ContractingParty.all().ancestor(thecontract).run()
# contract_id = contract.key().id()
# contract_parties = Contract.get_by_id(contract_id)
#http://stackoverflow.com/questions/11294526/how-to-model-a-contract-database-with-several-buyers-or-sellers-using-gae-data
#http://stackoverflow.com/questions/11311461/how-to-query-gae-datastore-to-render-a-template-newbie-level
app = webapp2.WSGIApplication([('/', MainHandler), ('/your_contract', your_contractHandler)],
                              debug=True)
4

1 に答える 1

1

dateContract モデルにフィールドがないため、何も返されません。

データストアはスキーマレスであるため、モデル内のエンティティに特定のフィールドがあるかどうかを GQL は認識できません。したがって、SQL とは異なり、存在しないフィールドを参照してもエラーは発生しません。単にクエリを実行し、何も見つからない場合は何も返しません。

いずれにせよ、なぜそれを照会したいのかわかりません。たとえそうしたとしてもput()、クエリを実行するのではなく、呼び出しから返されたキーによって実際に取得する必要があります。結果整合性モデルは、データが次のステートメントによって完全に永続化されない可能性があることを意味します。したがって、クエリキーによる直接取得は常にそうすることが保証されているのに対し、それは見えません。

于 2012-07-09T08:49:40.297 に答える