フォーム入力の2回目以降validを通らない

Question

シフト管理のアプリを作成しておりますが、初回はすんなりと保存でまでたどり着けるのですが、2回目以降vaildを通すことが出来ません。

特にエラーは出ていません。
POSTを飛ばしても反応せず、データ削除した状態だとvaildを通り次のページまで飛ぶことは出来ています。

モデルではuserとの紐づけと開始時間、終了時間、dateは予定の日
として設定しています。開始、終了はchoice

SUB_START = (
    ('0', '✕'),
    ('1', '14'),
    ('2', '16'),
    ('3', '17'),
    ('4', '17.5'),
    ('5', '18'),
    ('6', '18.5'),
    ('7', '19'),
    ('8', '19.5'),
    ('9', '20'),
    ('10', '〇'),
)
SUB_END = (
    ('0', '✕'),
    ('1', '22'),
    ('2', '23'),
    ('3', '〇'),

)

class Schedule(models.Model):
    """スケジュール"""
    user = models.ForeignKey(settings.AUTH_USER_MODEL, verbose_name='ユーザー', on_delete=models.SET_NULL, blank=True, null=True)
    start_time = models.CharField('開始時間', choices= SUB_START, max_length=50,blank=True,default="0")
    end_time = models.CharField('終了時間', choices= SUB_END, max_length=50,blank=True,default="0")
    date = models.DateField('日付')
    # created_at = models.DateTimeField('作成日', default=timezone.now)

    def __int__(self):
        return self.date

フォームは、dateの入力のみ非表示に

forms.py


class SimpleScheduleForm(forms.ModelForm):
    """シンプルなスケジュール登録用フォーム"""

    class Meta:
        model = Schedule
        fields = ('start_time', 'end_time', 'date')
        widgets = {

            'date': forms.HiddenInput,
        }

1日-15日、16日-31日
のようなカレンダーを作ってるのがmonthclarendarmixinです。
多分ここまでは問題ないはず、、、、です。

mixins.py

class MonthCalendarMixin(BaseCalendarMixin):
    """月間カレンダーの機能を提供するMixin"""

    def get_previous_week(self, date):
        if date.month == 1 and date.day ==16:
            return date.replace(year=date.year-1, month=12,day=16)
        if date.month == 1 and date.day ==1:
            return date.replace(year=date.year-1, month=12,day=1)

        if date.day == 16:
            return date.replace(month =date.month -1 ,day = 16)
        if date.day == 1:
            return date.replace(month =date.month -1 ,day = 1)

    def get_week_days(self):
        month = self.kwargs.get('month')
        year = self.kwargs.get('year')
        day = self.kwargs.get('day')
        if month and year and day:
            date = datetime.date(year=int(year), month=int(month), day=int(day))

            if date.month ==12 and date.day >10:
                month = 1
                year = date.year +1
                dtm = calendar.monthrange(year,month)[1]
                date = datetime.date(year = int(year),month=int(month),day = int(1))
                dtlist = [date + datetime.timedelta(days =day) for day in range(0,15)]
                return dtlist
            if date.month ==1  and  date.day ==1:
                month =12
                year = date.year-1
                dtm = calendar.monthrange(year,month)[1]
                date = datetime.date(year = int(year),month=int(month),day = int(15))
                dtlist = [date + datetime.timedelta(days =day) for day in range(1,dtm-14)]
                return dtlist

            if date.month != 12 and date.day < 21 and date.day > 4:
                dtm = calendar.monthrange(year,month)[1]
                date = datetime.date(year = int(year),month=int(month+1),day = int(1))
                dtlist = [date + datetime.timedelta(days =day) for day in range(0,15)]
                return dtlist
            if date.day < 6:
                dtm = calendar.monthrange(year,month)[1]
                date = datetime.date(year = int(year),month=int(month),day = int(15))
                dtlist = [date + datetime.timedelta(days =day) for day in range(1,dtm-14)]
                return dtlist
            if date.day > 20:
                month =month-1
                dtm = calendar.monthrange(year,month)[1]
                date = datetime.date(year = int(year),month=int(month),day = int(15))
                dtlist = [date + datetime.timedelta(days =day) for day in range(1,dtm-14)]
                return dtlist

        else:
            date = datetime.date.today()
            year =int(date.year)
            month=int(date.month)
            day=int(date.day)
            if date.day < 21 and date.day > 5:
                date = datetime.date(year = int(year),month=int(month+1),day = int(1))
                dtlist = [date + datetime.timedelta(days =day) for day in range(0,15)]
                return dtlist
            if date.day < 6:
                dtm = calendar.monthrange(year,month)[1]
                date = datetime.date(year = int(year),month=int(month),day = int(15))
                dtlist = [date + datetime.timedelta(days =day) for day in range(1,dtm-14)]
                return dtlist
            if date.day > 20:
                month = month + 1
                dtm = calendar.monthrange(year,month)[1]
                date = datetime.date(year = int(year),month=int(month),day = int(15))
                dtlist = [date + datetime.timedelta(days =day) for day in range(1,dtm-14)]
                return dtlist
            if date.month ==12 and date.day < 21 and date.day > 5:
                month = 1
                year = date.year +1
                dtm = calendar.monthrange(year,month)[1]
                date = datetime.date(year = int(year),month=int(month),day = int(1))
                dtlist = [date + datetime.timedelta(days =day) for day in range(0,15)]
                return dtlist


    def name(self):
        weekname=['月','火','水','木','金','土','日']
        name=[]
        week=[]
        day = self.get_week_days()
        for l in day:
            name.append(l.weekday())
        for nn in name:
            week.append(weekname[nn])
        return week



    def get_month_calendar(self):
        self.setup_calendar()
        days = self.get_week_days()
        first = days[0]
        last = days[-1]
        ago = self.get_previous_week(first)
        calendar_data = {
            'now': datetime.date.today(),
            'month_days': days,

            'month_previous': ago,
            'month_next': first,
            'week_names': self.name(),
        }
        return calendar_data


class MonthWithFormsMixin(MonthCalendarMixin):

    def get_month_forms(self, start, end, days):
        lookup = {
            '{}__range'.format(self.date_field): (start, end),
            'user__pk': self.kwargs.get('user_pk'),
        }
        queryset = self.model.objects.filter(**lookup)
        days_count = len(days)
        
        FormClass = forms.modelformset_factory(self.model, self.form_class, extra=days_count)
        if self.request.method == 'POST':
            formset = self.month_formset = FormClass(self.request.POST or None)
        else:
            formset = self.month_formset = FormClass(queryset=queryset)
        day_forms = {day: [] for day in days }

        dates =[]
        for bound_form in formset.initial_forms:
            instance = bound_form.instance
            date = getattr(instance, self.date_field)

            dates.append(date)
            


        for empty_form, (d, empty_list) in zip(formset.extra_forms, day_forms.items()):

            if d in dates:
                pass
            else:   
                date=d 
                empty_form.initial = {self.date_field: date}
                empty_list.append(empty_form)

        for bound_form in formset.initial_forms:
            instance = bound_form.instance
            date = getattr(instance, self.date_field)
            day_forms[date].append(bound_form)    

        return [{key: day_forms[key] for key in itertools.islice(day_forms, 0, days_count)}]

    def get_month_calendar(self):
        calendar_context = super().get_month_calendar()
        month_days = calendar_context['month_days']
        month_first = month_days[0]
        month_last = month_days[-1]
        calendar_context['month_day_forms'] = self.get_month_forms(
            month_first,
            month_last,
            month_days
        )
        calendar_context['month_formset'] = self.month_formset
        
        return calendar_context

views.py

class MonthWithFormsCalendar(mixins.MonthWithFormsMixin, generic.View):

    template_name = 'app/month_with_forms.html'
    model = Schedule
    date_field = 'date'
    form_class = SimpleScheduleForm

    def get(self, request, **kwargs):
        print(1)
        context = self.get_month_calendar()
        context['user'] = get_object_or_404(User, pk=self.kwargs['user_pk'])
        return render(request, self.template_name, context)
    

    def post(self, request, **kwargs):
        print(2)
        context = self.get_month_calendar()
        user_pk = self.kwargs['user_pk']
        user = get_object_or_404(User, pk=user_pk)
        context['user'] = user
        
        formset = context['month_formset']
        print(formset)
        if formset.is_valid():
            print(1)
            instances = formset.save(commit=False)
            for schedule in instances:
                schedule.user = user
                schedule.save()
            return redirect('app:week_with_schedule', user_pk=user_pk)

        return render(request, self.template_name, context)

よろしくお願いします。

Answer 1

解決しました。

class MonthWithFormsMixin(MonthCalendarMixin):
 

    def get_month_forms(self, start, end, days):
      
        lookup = {
        
            '{}__range'.format(self.date_field): (start, end),
            'user__pk': self.kwargs.get('user_pk'),
        }
       
        queryset = self.model.objects.filter(**lookup)
        days_count = len(days)
        
        FormClass = forms.modelformset_factory(self.model, self.form_class, extra=days_count,max_num=days_count)
        if self.request.method == 'POST':

            formset = self.month_formset = FormClass(self.request.POST)
        else:
            formset = self.month_formset = FormClass(queryset=queryset)

       
        dates =[]
        for bound_form in formset.initial_forms:
            
            instance = bound_form.instance
            date = getattr(instance, self.date_field)
            dates.append(date)
            days.remove(date)
        print(len(dates))
        day_forms = {day: [] for day in days }

        for empty_form, (date, empty_list) in zip(formset.extra_forms, day_forms.items()):
            empty_form.initial = {self.date_field: date}
            empty_list.append(empty_form)
           
        for bound_form in formset.initial_forms:
            instance = bound_form.instance
            date = getattr(instance, self.date_field)
            d2 ={date:[]}
            d2[date].append(bound_form)   
            day_forms.update(d2)
        
        day_forms = sorted(day_forms.items())
        day_forms=dict(day_forms)


        return [{key: day_forms[key] for key in itertools.islice(day_forms, 0, days_count)}]

    def get_month_calendar(self):
        calendar_context = super().get_month_calendar()
        month_days = calendar_context['month_days']
        month_first = month_days[0]
        month_last = month_days[-1]
        calendar_context['month_day_forms'] = self.get_month_forms(
            month_first,
            month_last,
            month_days
        )
        calendar_context['month_formset'] = self.month_formset
        
        return calendar_context