How to disable the options in select with Django - Stack Overflow

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I created a calendar with dates where appointments can be made. I then created a form to select appointments. I want each time an appointment is made, it to be grayed out for the exact day and time it was made. For March 2, 2025 I booked an appointment at 9am, for January 24, I booked an appointment at 8am and for March 6, 2025, I booked an appointment at 2:15pm. However, as you can see in the picture, when I click on March 2, 2025, the times 8am, 9am and 2:15pm are all grayed out even though I used them for different days. Thanks in advance #**********************************

def formatday(self, day, rdvs):

   select_hour = RdvForm()
   select_dat = Rdv.objects.all().values()

   p = len(select_dat)`enter code here`
   rr =len(select_hour['start_time'])

   ls_h = []
   ls_d =[]
   ls_dd=[]

# add value in list
   for  i in range(p):
      ls_h.append(select_dat[i]["start_time"])

   for lis_d in range(p):
       f = str(select_dat[lis_d]["select_date"])
       ls_d.append(f[:7])
        
#list day year
   for dd in range(p):
      ff = str(select_dat[dd]["select_date"])
      ls_dd.append(int(ff[8:]))

  year_month_curent =str (self.year)+'-'+str("{:02}".format(self.month))

  htm = f'<select name="start_time" id="id_start_time">'
        
       
       
 for i in range(rr):
            if  select_hour['start_time'][i].data['value'] in ls_h and year_month_curent in ls_d and day in ls_dd: 
                 htm+= f'<option class="{i}" disabled="disabled" value="{select_hour['start_time'][i].data["value"]}">{select_hour['start_time'][i].data["value"]}</option>'

            else:       
                htm+= f'<option value="{select_hour['start_time'][i].data["value"]}">{select_hour['start_time'][i].data["value"]}</option>'
                        
         
   htm+=f'</select>'

#*****************
   for i in range(rr):
            if day != 0:
                return f"<td><span class='date' style='font-weight:bold' 
                {'{:02}'.format(day)}</span><br> {htm} </td>"
            
            return '<td></td>'

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