爲什麼我的數據沒有被更新？

Question

這是數據庫模型，用戶更改重要性，並根據用戶選擇的級別，將得分/點分配爲 ，但是無論選擇什麼，它顯示的所有值都是my_points的值爲300，而他們的值爲0。

from django.db import models 
from django.conf import settings 
from django.db.models.signals import post_save 
# Create your models here. 
class Question(models.Model): 
    text = models.TextField() 
    active = models.BooleanField(default = True) 
    draft = models.BooleanField(default = False) 
    timestamp = models.DateTimeField(auto_now_add=True, auto_now=False) 
    #answers = models.ManyToManyField('Answer') 

    def __unicode__(self): 
     return self.text[:10] 


class Answer(models.Model): 
    question = models.ForeignKey(Question) 
    text = models.CharField(max_length=120) 
    active = models.BooleanField(default=True) 
    draft = models.BooleanField(default=False) 
    timestamp = models.DateTimeField(auto_now_add=True, auto_now=False) 


    def __unicode__(self): #def __str__(self): 
     return self.text[:10] 
LEVELS = (
    ('Mandatory', 'Mandatory'), 
    ('Very Important', 'Very Important'), 
    ('Somewhat Important', 'Somewhat Important'), 
    ('Not Important', 'Not Important'), 
    ) 

class UserAnswer(models.Model): 
    user = models.ForeignKey(settings.AUTH_USER_MODEL) 
    question = models.ForeignKey(Question) 
    my_answer = models.ForeignKey(Answer, related_name = 'user_answer') 
    my_answer_importance = models.CharField(max_length=50, choices= LEVELS) 
    my_points = models.IntegerField(default=-1) 
    their_answer = models.ForeignKey(Answer, null=True, blank=True, related_name = 'match_answer') 
    their_importance = models.CharField(max_length=50, choices= LEVELS) 
    their_points = models.IntegerField(default=-1) 
    timestamp = models.DateTimeField(auto_now_add=True, auto_now=False) 

    def __unicode__(self): 
     return self.my_answer.text[:10] 

def score_importance(importance_level): 
    if importance_level == "Mandatory": 
     points = 300 
    elif importance_level == "Very Important": 
     points = 200 
    elif importance_level == "Somewhat Important": 
     points = 50 
    elif importance_level == "Not Important": 
     points = 0 
    else: 
     points = 0 
    return points 


def update_user_answer_score(sender, instance, created, *args, **kwargs): 
    #print sender 
    print instance 
    #print created 
    if instance.my_points == -1: 
     my_points = score_importance(instance.my_answer_importance) 
     instance.my_points = my_points 
     print my_points 
     instance.save() 
    if instance.their_points == -1: 
     their_points = score_importance(instance.their_importance) 
     instance.their_points = their_points 
     print my_points 
     instance.save() 


post_save.connect(update_user_answer_score, sender=UserAnswer) 

Answer 1

你的代碼是不必要的複雜。你真的不需要分開的my_points和my_answer_importance字段和你使用選擇的方式，這種方式可以打敗使用選擇的整個觀點。我建議你改變你的代碼是這樣的：

LEVELS = (
    (300, 'Mandatory'), 
    (200, 'Very Important'), 
    (50, 'Somewhat Important'), 
    (0, 'Not Important'), 
    ) 

class UserAnswer(models.Model): 
    user = models.ForeignKey(settings.AUTH_USER_MODEL) 
    question = models.ForeignKey(Question) 
    my_answer = models.ForeignKey(Answer, related_name = 'user_answer') 
    my_points = models.IntegerField(default=-1, choices=LEVELS) 
    their_answer = models.ForeignKey(Answer, null=True, blank=True, related_name = 'match_answer') 
    their_points = models.IntegerField(default=-1, choices=LEVELS) 
    timestamp = models.DateTimeField(auto_now_add=True, auto_now=False) 

    def __unicode__(self): 
     return self.my_answer.text[:10] 

現在你不需要你的信號和整個代碼塊可以被刪除。