Re: Not able to update a form in Django after post method

For starters, validate the form before getting its data

smsPduForm = SmsPduForm(request.POST)

if smsPduForm.is_valid():

    d = smsPduForm.cleaned_data

    smsc = d['SMSC']

    # etc...

regarding the form assignment, I'm not too sure what you're trying to do. ¿Do you want to display the same form with the same data but changing a field? In that case I think you need to instantiate a new Form object with the data from the old one, changing the corresponding field.

form_data = smsPduForm.data

form_data['smsPDU'] = smsPdu

new_smsPduForm = SmsPduForm(form_data)

either way, since the first request was made via POST then you should redirect to a different page instead of rendering a new one in the same request cycle, otherwise if the user refreshes the new page then your logic will be executed twice.

On Mon, Jan 5, 2015 at 5:23 PM, rajat shukla <shukla.rajat03@gmail.com> wrote:

I am trying to update a form field after getting a form in the POST method. When I am trying to update the form I am getting following error

Request Method: POST  Django Version: 1.6.6  Exception Type: TypeError  Exception Value:      'SmsPduForm' object does not support item assignment  

My Form Code is

class SmsPduForm(forms.Form):      """      This class generates the SMS PDU form      """      pduType = (('1','SMS-SUBMIT'), ('2','SMS-DELIVER'))      encoding = (('0','7 BIT'), ('8','UCS2'))      Address = forms.CharField(max_length=20, min_length=5, required=True, label="Target Address",                                 initial="+917654321")        SMSC = forms.CharField(max_length=13, min_length=5,required=True, label="SMSC Address",                          initial="+91244414")        PDUType = forms.ChoiceField(widget=forms.RadioSelect, choices=pduType, required=True,                                  label="PDU Type", initial=pduType[0])        EncodingType = forms.ChoiceField(widget=forms.RadioSelect, choices=encoding, required=True, label="Encoding Type",                                       initial=encoding[0])        Text = forms.CharField(widget=forms.Textarea(attrs={'row':6, 'cols':50}),required=True, label="SMS Text",                             initial="Hello", max_length=140)        smsPDU = forms.CharField(widget=forms.Textarea(attrs={'row':6, 'cols':50}),required=True, label="SMS PDU",                             initial="Hello", max_length=140)        #Meta class of the form      class Meta:          fields = ('Address', 'SMSC', 'PDUType',                    'EncodingType', 'Text', 'smsPDU')  

My view code is

def smsHandler(request):      context = RequestContext(request)      if request.method == 'POST':          method=""          #Do for post method else do for get method          smsPduForm = SmsPduForm(request.POST)          smsc = smsPduForm['SMSC'].value()          address = smsPduForm['Address'].value()          encodingType = smsPduForm['EncodingType'].value()          pduType = smsPduForm['PDUType'].value()          text = smsPduForm['Text'].value()          smsPdu = smsPduForm['smsPDU'].value()          print(smsc,address,encodingType,pduType,text,smsPdu)          if "Encode" in request.POST:              method = "encode"              smsEncObj = SmsEncoder(encodingType, smsc, pduType, text, address )              smsPdu = smsEncObj.generateSmsSubmitPdu()              #SmsPduForm.clean_smsPDU()              #Here I am updating the form              smsPduForm['smsPDU'] = smsPdu          elif "Decode" in request.POST:              method = "decode"          print("Action need to perform:",method)              contextDic = {'forms':SmsPduForm}          return render_to_response('telecom_utils/smsUtil.html',contextDic,context)      else:          contextDic = {'forms':SmsPduForm}          return render_to_response('telecom_utils/smsUtil.html',contextDic,context)  

How can i update the form ? Kindly look into the issue.

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