value of checkbox aren't saved in the form

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 . 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 %}

                                     &nbsp; 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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