i am a beginner with Django. I don''t know what the problem with the value 
of checkbox. When i enter to the saved form the value of checkbox aren't 
save.The image is here <https://i.stack.imgur.com/yZMuu.png> . Please I 
need your help, I loose too much time on this.

This is my forms.py:

*class BacktestForm(forms.ModelForm):*

* period_start = forms.DateField(initial=datetime.datetime.today().date() - 
datetime.timedelta(days=365+16), 
widget=forms.widgets.DateInput(format="%Y/%m/%d"), 
input_formats=["%Y/%m/%d"])*
* period_end = forms.DateField(initial=datetime.datetime.today().date() - 
datetime.timedelta(days=16), 
widget=forms.widgets.DateInput(format="%Y/%m/%d"), 
input_formats=["%Y/%m/%d"])*
        
*        market = 
forms.MultipleChoiceField(required=False,widget=CheckboxSelectMultiple, 
choices=MARKET_CHOICES)*
*        sector = 
forms.MultipleChoiceField(required=False,widget=CheckboxSelectMultiple, 
choices= MEDIA_CHOICES)*
* class Meta:*
* model = Parameters*

*This is my models.py:*










*class Parameters(models.Model): user = models.ForeignKey(User) title = 
models.CharField('title', max_length=100, default='', blank=True, 
help_text='Use an indicative name, related to the chosen parameters') type 
= models.CharField('forecast type', choices=FORECAST_TYPES, max_length=20, 
default="backtest") #input characteristics price_1_min = 
models.FloatField('1. Price, min', default=0.1, 
validators=[MinValueValidator(0.1), MaxValueValidator(20000)])def 
get_backtest_url(self): return reverse('saved_backtest', kwargs={'pk': 
self.pk})The save function in views.py:         if request.method == 
'POST': if form.is_valid(): if 'save' in request.POST: obj = 
form.save(commit= False) obj.user = request.user obj.type = "backtest" 
obj.save() messages.info(request, 'Saved!') return 
redirect(obj.get_backtest_url())The template for the saved form is : <div> 
{% if user.is_authenticated %} {% if user.profile.is_active %}              
                         Saved from "Backtesting" <ul> {% for param in 
user.parameters_set.all %} {% if param.type == "backtest" %}               
                                           <table style="width:100%">      
                                                    <tr>                    
                                       <th> Saved File </th>                
                                           <th> Created at </th>            
                                                                           
                              <tr>                                          
                     <td> <a 
href='{{param.get_backtest_url}}'>{{param.title}}  </a> </td>   <td> 
{{param.created_at}} </td>                                                  
                   </tr>         </table> {% endif %} {% endfor %} </ul>*

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