Django：如何增加存储在models.py/Database中的计数器

我创建了一个小型计数器模型

类计数器

，用于存储小型调查应用程序完成的次数

我想从my views.py中的

def done（）

方法中增加my models.py中的

SurveyWizardOneCounter

谁能告诉我怎么做

以前我使用全局变量作为计数器，我发现它不能与web应用程序正常工作。我正在尝试学习如何在数据库中创建和存储计数器。感谢您的帮助

型号.py

class Counter(models.Model):                
    SurveyWizardOneCounter = models.SmallIntegerField()
    TotalMaxCounter = models.SmallIntegerField() 

from survey.models import Counter

def done(self, form_list, **kwargs):

    Counter.SurveyWizardOneCounter += 1  # This is where I am trying to increment the counter

    logger.debug('\n\n SurveyWizardOneCounter = %s', SurveyWizardOneCounter)

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    })  

SURVEY_WIZARD_TYPE_CHOICES = ['survey_wizard_one', 'survey_wizard_two', 'survey_wizard_three', 'survey_wizard_four', 'survey_wizard_five', 'survey_wizard_six', 'survey_wizard_seven', 'survey_wizard_eight', 'survey_wizard_nine']

class Counter(models.Model): 

    survey_wizard_type = models.CharField(choices=SURVEY_WIZARD_TYPE_CHOICES)
    survey_wizard_count = models.SmallIntegerField(default=0)
    total_max_counter = models.SmallIntegerField() 

from django.db.models import F
from survey.models import Counter

def done(self, form_list, **kwargs):

    survey_counter = Counter.objects.get_or_create(survey_wizard_type= 'survey_wizard_x') # x can be any value from one to nine
    survey_counter.survey_wizard_count = F('survey_wizard_count') + 1 
    survey_counter.save()

    logger.debug('\n\n SurveyWizardOneCounter = %s', SurveyWizardOneCounter)

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    })   

class Counter(models.Model):

    SURVEY_WIZARD_TYPE_CHOICES = (
                              ('SURVEY_WIZARD_ONE', 'survey_wizard_one'),
                              ('SURVEY_WIZARD_TWO', 'survey_wizard_two'), 
                              ('SURVEY_WIZARD_THREE', 'survey_wizard_three'), 
                              ('SURVEY_WIZARD_FOUR', 'survey_wizard_four'), 
                              ('SURVEY_WIZARD_FIVE', 'survey_wizard_five'),
                              ('SURVEY_WIZARD_SIX', 'survey_wizard_six'), 
                              ('SURVEY_WIZARD_SEVEN', 'survey_wizard_seven'),
                              ('SURVEY_WIZARD_EIGHT', 'survey_wizard_eight'),
                              ('SURVEY_WIZARD_NINE', 'survey_wizard_nine'),
                              )   

    survey_wizard_type = models.CharField(max_length=1000, choices=SURVEY_WIZARD_TYPE_CHOICES)
    survey_wizard_count = models.SmallIntegerField(default=0)
    total_max_counter = models.SmallIntegerField(default=0) 

def done(self, form_list, **kwargs):

    survey_counter = Counter.objects.get_or_create(survey_wizard_type= 'survey_wizard_one')[0] # x can be any value from one to nine
    survey_counter.survey_wizard_count = F('survey_wizard_count') + 1 
    survey_counter.save()

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    }) 

视图.py

class Counter(models.Model):                
    SurveyWizardOneCounter = models.SmallIntegerField()
    TotalMaxCounter = models.SmallIntegerField() 

from survey.models import Counter

def done(self, form_list, **kwargs):

    Counter.SurveyWizardOneCounter += 1  # This is where I am trying to increment the counter

    logger.debug('\n\n SurveyWizardOneCounter = %s', SurveyWizardOneCounter)

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    })  

SURVEY_WIZARD_TYPE_CHOICES = ['survey_wizard_one', 'survey_wizard_two', 'survey_wizard_three', 'survey_wizard_four', 'survey_wizard_five', 'survey_wizard_six', 'survey_wizard_seven', 'survey_wizard_eight', 'survey_wizard_nine']

class Counter(models.Model): 

    survey_wizard_type = models.CharField(choices=SURVEY_WIZARD_TYPE_CHOICES)
    survey_wizard_count = models.SmallIntegerField(default=0)
    total_max_counter = models.SmallIntegerField() 

from django.db.models import F
from survey.models import Counter

def done(self, form_list, **kwargs):

    survey_counter = Counter.objects.get_or_create(survey_wizard_type= 'survey_wizard_x') # x can be any value from one to nine
    survey_counter.survey_wizard_count = F('survey_wizard_count') + 1 
    survey_counter.save()

    logger.debug('\n\n SurveyWizardOneCounter = %s', SurveyWizardOneCounter)

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    })   

class Counter(models.Model):

    SURVEY_WIZARD_TYPE_CHOICES = (
                              ('SURVEY_WIZARD_ONE', 'survey_wizard_one'),
                              ('SURVEY_WIZARD_TWO', 'survey_wizard_two'), 
                              ('SURVEY_WIZARD_THREE', 'survey_wizard_three'), 
                              ('SURVEY_WIZARD_FOUR', 'survey_wizard_four'), 
                              ('SURVEY_WIZARD_FIVE', 'survey_wizard_five'),
                              ('SURVEY_WIZARD_SIX', 'survey_wizard_six'), 
                              ('SURVEY_WIZARD_SEVEN', 'survey_wizard_seven'),
                              ('SURVEY_WIZARD_EIGHT', 'survey_wizard_eight'),
                              ('SURVEY_WIZARD_NINE', 'survey_wizard_nine'),
                              )   

    survey_wizard_type = models.CharField(max_length=1000, choices=SURVEY_WIZARD_TYPE_CHOICES)
    survey_wizard_count = models.SmallIntegerField(default=0)
    total_max_counter = models.SmallIntegerField(default=0) 

def done(self, form_list, **kwargs):

    survey_counter = Counter.objects.get_or_create(survey_wizard_type= 'survey_wizard_one')[0] # x can be any value from one to nine
    survey_counter.survey_wizard_count = F('survey_wizard_count') + 1 
    survey_counter.save()

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    }) 

---

我假设您的

计数器

模型只存储一条记录

c = Counter.objects.get()
c.SurveyWizardOneCounter += 1
# Update another attributes if you need
c.save()

或许

from django.db.models import F

Counter.objects.filter().update(SurveyWizardOneCounter=F('SurveyWizardOneCounter')+1)

---

由于您有9个不同的测量计数器，并且在提交测量时需要增加每个计数器，因此最好定义一个字段

survey\u wizard\u type

，其可能值为

survey\u wizard\u one

，

survey\u wizard\u two

till

survey\u wizard\u nine

和一个具有默认值

0

的字段

survey\u wizard\u count

，该字段存储特定调查向导的计数。您的数据库中将有9条记录用于

计数器

型号

型号.py

class Counter(models.Model):                
    SurveyWizardOneCounter = models.SmallIntegerField()
    TotalMaxCounter = models.SmallIntegerField() 

from survey.models import Counter

def done(self, form_list, **kwargs):

    Counter.SurveyWizardOneCounter += 1  # This is where I am trying to increment the counter

    logger.debug('\n\n SurveyWizardOneCounter = %s', SurveyWizardOneCounter)

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    })  

SURVEY_WIZARD_TYPE_CHOICES = ['survey_wizard_one', 'survey_wizard_two', 'survey_wizard_three', 'survey_wizard_four', 'survey_wizard_five', 'survey_wizard_six', 'survey_wizard_seven', 'survey_wizard_eight', 'survey_wizard_nine']

class Counter(models.Model): 

    survey_wizard_type = models.CharField(choices=SURVEY_WIZARD_TYPE_CHOICES)
    survey_wizard_count = models.SmallIntegerField(default=0)
    total_max_counter = models.SmallIntegerField() 

from django.db.models import F
from survey.models import Counter

def done(self, form_list, **kwargs):

    survey_counter = Counter.objects.get_or_create(survey_wizard_type= 'survey_wizard_x') # x can be any value from one to nine
    survey_counter.survey_wizard_count = F('survey_wizard_count') + 1 
    survey_counter.save()

    logger.debug('\n\n SurveyWizardOneCounter = %s', SurveyWizardOneCounter)

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    })   

class Counter(models.Model):

    SURVEY_WIZARD_TYPE_CHOICES = (
                              ('SURVEY_WIZARD_ONE', 'survey_wizard_one'),
                              ('SURVEY_WIZARD_TWO', 'survey_wizard_two'), 
                              ('SURVEY_WIZARD_THREE', 'survey_wizard_three'), 
                              ('SURVEY_WIZARD_FOUR', 'survey_wizard_four'), 
                              ('SURVEY_WIZARD_FIVE', 'survey_wizard_five'),
                              ('SURVEY_WIZARD_SIX', 'survey_wizard_six'), 
                              ('SURVEY_WIZARD_SEVEN', 'survey_wizard_seven'),
                              ('SURVEY_WIZARD_EIGHT', 'survey_wizard_eight'),
                              ('SURVEY_WIZARD_NINE', 'survey_wizard_nine'),
                              )   

    survey_wizard_type = models.CharField(max_length=1000, choices=SURVEY_WIZARD_TYPE_CHOICES)
    survey_wizard_count = models.SmallIntegerField(default=0)
    total_max_counter = models.SmallIntegerField(default=0) 

def done(self, form_list, **kwargs):

    survey_counter = Counter.objects.get_or_create(survey_wizard_type= 'survey_wizard_one')[0] # x can be any value from one to nine
    survey_counter.survey_wizard_count = F('survey_wizard_count') + 1 
    survey_counter.save()

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    }) 

然后，在

views.py

中，您可以使用

get\u或\u create

方法使用给定的

survey\u向导类型

查找

计数器

对象，必要时创建一个。然后将测量向导计数增加1，并将该对象保存到数据库中

视图.py

class Counter(models.Model):                
    SurveyWizardOneCounter = models.SmallIntegerField()
    TotalMaxCounter = models.SmallIntegerField() 

from survey.models import Counter

def done(self, form_list, **kwargs):

    Counter.SurveyWizardOneCounter += 1  # This is where I am trying to increment the counter

    logger.debug('\n\n SurveyWizardOneCounter = %s', SurveyWizardOneCounter)

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    })  

SURVEY_WIZARD_TYPE_CHOICES = ['survey_wizard_one', 'survey_wizard_two', 'survey_wizard_three', 'survey_wizard_four', 'survey_wizard_five', 'survey_wizard_six', 'survey_wizard_seven', 'survey_wizard_eight', 'survey_wizard_nine']

class Counter(models.Model): 

    survey_wizard_type = models.CharField(choices=SURVEY_WIZARD_TYPE_CHOICES)
    survey_wizard_count = models.SmallIntegerField(default=0)
    total_max_counter = models.SmallIntegerField() 

from django.db.models import F
from survey.models import Counter

def done(self, form_list, **kwargs):

    survey_counter = Counter.objects.get_or_create(survey_wizard_type= 'survey_wizard_x') # x can be any value from one to nine
    survey_counter.survey_wizard_count = F('survey_wizard_count') + 1 
    survey_counter.save()

    logger.debug('\n\n SurveyWizardOneCounter = %s', SurveyWizardOneCounter)

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    })   

class Counter(models.Model):

    SURVEY_WIZARD_TYPE_CHOICES = (
                              ('SURVEY_WIZARD_ONE', 'survey_wizard_one'),
                              ('SURVEY_WIZARD_TWO', 'survey_wizard_two'), 
                              ('SURVEY_WIZARD_THREE', 'survey_wizard_three'), 
                              ('SURVEY_WIZARD_FOUR', 'survey_wizard_four'), 
                              ('SURVEY_WIZARD_FIVE', 'survey_wizard_five'),
                              ('SURVEY_WIZARD_SIX', 'survey_wizard_six'), 
                              ('SURVEY_WIZARD_SEVEN', 'survey_wizard_seven'),
                              ('SURVEY_WIZARD_EIGHT', 'survey_wizard_eight'),
                              ('SURVEY_WIZARD_NINE', 'survey_wizard_nine'),
                              )   

    survey_wizard_type = models.CharField(max_length=1000, choices=SURVEY_WIZARD_TYPE_CHOICES)
    survey_wizard_count = models.SmallIntegerField(default=0)
    total_max_counter = models.SmallIntegerField(default=0) 

def done(self, form_list, **kwargs):

    survey_counter = Counter.objects.get_or_create(survey_wizard_type= 'survey_wizard_one')[0] # x can be any value from one to nine
    survey_counter.survey_wizard_count = F('survey_wizard_count') + 1 
    survey_counter.save()

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    }) 

编辑 Rahul提供了解决方案，但这是我最终使用的代码

型号.py

class Counter(models.Model):                
    SurveyWizardOneCounter = models.SmallIntegerField()
    TotalMaxCounter = models.SmallIntegerField() 

from survey.models import Counter

def done(self, form_list, **kwargs):

    Counter.SurveyWizardOneCounter += 1  # This is where I am trying to increment the counter

    logger.debug('\n\n SurveyWizardOneCounter = %s', SurveyWizardOneCounter)

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    })  

SURVEY_WIZARD_TYPE_CHOICES = ['survey_wizard_one', 'survey_wizard_two', 'survey_wizard_three', 'survey_wizard_four', 'survey_wizard_five', 'survey_wizard_six', 'survey_wizard_seven', 'survey_wizard_eight', 'survey_wizard_nine']

class Counter(models.Model): 

    survey_wizard_type = models.CharField(choices=SURVEY_WIZARD_TYPE_CHOICES)
    survey_wizard_count = models.SmallIntegerField(default=0)
    total_max_counter = models.SmallIntegerField() 

from django.db.models import F
from survey.models import Counter

def done(self, form_list, **kwargs):

    survey_counter = Counter.objects.get_or_create(survey_wizard_type= 'survey_wizard_x') # x can be any value from one to nine
    survey_counter.survey_wizard_count = F('survey_wizard_count') + 1 
    survey_counter.save()

    logger.debug('\n\n SurveyWizardOneCounter = %s', SurveyWizardOneCounter)

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    })   

class Counter(models.Model):

    SURVEY_WIZARD_TYPE_CHOICES = (
                              ('SURVEY_WIZARD_ONE', 'survey_wizard_one'),
                              ('SURVEY_WIZARD_TWO', 'survey_wizard_two'), 
                              ('SURVEY_WIZARD_THREE', 'survey_wizard_three'), 
                              ('SURVEY_WIZARD_FOUR', 'survey_wizard_four'), 
                              ('SURVEY_WIZARD_FIVE', 'survey_wizard_five'),
                              ('SURVEY_WIZARD_SIX', 'survey_wizard_six'), 
                              ('SURVEY_WIZARD_SEVEN', 'survey_wizard_seven'),
                              ('SURVEY_WIZARD_EIGHT', 'survey_wizard_eight'),
                              ('SURVEY_WIZARD_NINE', 'survey_wizard_nine'),
                              )   

    survey_wizard_type = models.CharField(max_length=1000, choices=SURVEY_WIZARD_TYPE_CHOICES)
    survey_wizard_count = models.SmallIntegerField(default=0)
    total_max_counter = models.SmallIntegerField(default=0) 

def done(self, form_list, **kwargs):

    survey_counter = Counter.objects.get_or_create(survey_wizard_type= 'survey_wizard_one')[0] # x can be any value from one to nine
    survey_counter.survey_wizard_count = F('survey_wizard_count') + 1 
    survey_counter.save()

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    }) 

视图.py

class Counter(models.Model):                
    SurveyWizardOneCounter = models.SmallIntegerField()
    TotalMaxCounter = models.SmallIntegerField() 

from survey.models import Counter

def done(self, form_list, **kwargs):

    Counter.SurveyWizardOneCounter += 1  # This is where I am trying to increment the counter

    logger.debug('\n\n SurveyWizardOneCounter = %s', SurveyWizardOneCounter)

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    })  

SURVEY_WIZARD_TYPE_CHOICES = ['survey_wizard_one', 'survey_wizard_two', 'survey_wizard_three', 'survey_wizard_four', 'survey_wizard_five', 'survey_wizard_six', 'survey_wizard_seven', 'survey_wizard_eight', 'survey_wizard_nine']

class Counter(models.Model): 

    survey_wizard_type = models.CharField(choices=SURVEY_WIZARD_TYPE_CHOICES)
    survey_wizard_count = models.SmallIntegerField(default=0)
    total_max_counter = models.SmallIntegerField() 

from django.db.models import F
from survey.models import Counter

def done(self, form_list, **kwargs):

    survey_counter = Counter.objects.get_or_create(survey_wizard_type= 'survey_wizard_x') # x can be any value from one to nine
    survey_counter.survey_wizard_count = F('survey_wizard_count') + 1 
    survey_counter.save()

    logger.debug('\n\n SurveyWizardOneCounter = %s', SurveyWizardOneCounter)

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    })   

class Counter(models.Model):

    SURVEY_WIZARD_TYPE_CHOICES = (
                              ('SURVEY_WIZARD_ONE', 'survey_wizard_one'),
                              ('SURVEY_WIZARD_TWO', 'survey_wizard_two'), 
                              ('SURVEY_WIZARD_THREE', 'survey_wizard_three'), 
                              ('SURVEY_WIZARD_FOUR', 'survey_wizard_four'), 
                              ('SURVEY_WIZARD_FIVE', 'survey_wizard_five'),
                              ('SURVEY_WIZARD_SIX', 'survey_wizard_six'), 
                              ('SURVEY_WIZARD_SEVEN', 'survey_wizard_seven'),
                              ('SURVEY_WIZARD_EIGHT', 'survey_wizard_eight'),
                              ('SURVEY_WIZARD_NINE', 'survey_wizard_nine'),
                              )   

    survey_wizard_type = models.CharField(max_length=1000, choices=SURVEY_WIZARD_TYPE_CHOICES)
    survey_wizard_count = models.SmallIntegerField(default=0)
    total_max_counter = models.SmallIntegerField(default=0) 

def done(self, form_list, **kwargs):

    survey_counter = Counter.objects.get_or_create(survey_wizard_type= 'survey_wizard_one')[0] # x can be any value from one to nine
    survey_counter.survey_wizard_count = F('survey_wizard_count') + 1 
    survey_counter.save()

    for form in form_list:
        form.save()

    return render(self.request, 'Return_to_AMT.html', {
        'form_data': [form.cleaned_data for form in form_list],            
    }) 

---

您应该确保使用原子方法更新字段，上面的一些答案可能在更新和保存之间存在竞争条件。建议使用以下方法：

from django.db.models import F
product = Product.objects.get(name='Venezuelan Beaver Cheese')
product.number_sold = F('number_sold') + 1
product.save()

---

django中的模型表示具有多行的数据库表，而不仅仅是单个数据存储。如果你还没有这样做，你真的应该通过django教程来了解模型是什么以及它是如何工作的。如果不是模型，我应该看什么来存储这样一个计数器变量？如果你需要，可以将它存储在模型中。该表是否只有一条记录？@Gocht将有9个这样的计数器，SurveyWizardOneCounter，SurveyWizardTwoCounter，等等。您确实需要创建一个带有计数器字段的

Survey

模型……感谢解决方案Rahul，我希望您不介意我添加了一些东西，以防其他人需要它！你的第一个建议是非原子性的（你可以得到一个竞赛条件）。第二种选择要好得多。请参阅Django推荐的方法：