Django get an instance of a object and pass it through to a form

Question

I am new to Django and programming in general. I am trying to generate a list of records from a database but with two fields that can be edited. In the browser it should show a line with the fields: clientcode, clientname, Reason, comment Name and description come from the model and are a reference. The user should only be able to capture reason and comments

I have created a forms.py file and a ModelForm. My issue is how do I pass through an individual object. For this example I've limited my dataset to 10 records In my view file

def home(request):
    if request.method == 'GET':
        nca = NcaRe.objects.all()[:10]
        form = NcaReForm(instance= <what should go in here> )
        return render(request, 'NCAComments/home.html', {'form': form, 'nca': nca})
    else:
        pass

In my model I have a field called primarykey. I'm not sure how to pass this to the form so that I only bring in that record. I have tried looking at the documentation but have not been able to follow it.

My Model py.

from django.db import models


class NcaRe(models.Model):
    primarykey = models.IntegerField(blank=True, null=False, primary_key=True)
    clientcode = models.CharField(db_column='ClientCode', max_length=200, blank=True, null=True) 
    clientname = models.CharField(db_column='ClientName', max_length=510, blank=True, null=True)
    reason = models.TextField(blank=True, null=True)
    comment = models.TextField(blank=True, null=True)  
    class Meta:
        db_table = 'NCA_RE'

Forms.py

from django.forms import ModelForm
from .models import NcaRe

class NcaReForm(ModelForm):
    class Meta:
        model = NcaRe
        fields = ['reason', 'comment']

In html I am trying to loop through and pass the form

{% for n in nca %}
<p> {{n.clientcode}}</p>
<form>
    {% csrf_token %}
    {{ form }}
</form>
{% endfor %}

Could you edit your question to include forms.py and models.py in it? — BABAK ASHRAFI
– BABAK ASHRAFI, Commented May 17, 2020 at 4:34
Edited to include the forms, models and what I am trying to achieve with the html — Philip Seimenis
– Philip Seimenis, Commented May 17, 2020 at 4:44

BABAK ASHRAFI · Accepted Answer · 2020-05-17 10:10:07Z

1

In general, you need to just return empty form if the method of request if GET like as form(). I write below sample code that you can do your calculation in after form validation form.is_valid()

views.py

from django.shortcuts import render
from testPhilip.forms import NcaReForm
from testPhilip.models import NcaRe


def home(request):
    if request.method == 'GET':
        nca = NcaRe.objects.all()[:10]
        form = NcaReForm()

    elif request.method == 'POST':
        form = NcaReForm(request.POST)
        if form.is_valid():
            # process the data in form.cleaned_data as required
            # ...
            # redirect to a new URL:

    return render(request, 'testPhilip/home.html', {'form': form, 'nca': nca})

You can retrieve the data after form validation in a cleaned format like this: comment = form.cleaned_data['comment']

Update:

If you want to populate your form fields with values from database or any default values, you can pass them in the 'GET' section as below:

nca_object=NcaRe.objects.get(pk=nca_id)
form=NcaReForm({
    'comment':nca_object.comment,
    'reason':nca_object.reason,
})

For more information about writing forms refer to Django forms doc

edited May 17, 2020 at 10:10

answered May 17, 2020 at 9:16

BABAK ASHRAFI

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3 Comments

Philip Seimenis Over a year ago

Thanks. In this case I am looking more for an update/put option. Reason and comment could already be populated so I would want them to be returned and updated. That's why I am looking to return the instance in the loop. Its from an existing database table so I have initial values in many instances.

BABAK ASHRAFI Over a year ago

@PhilipSeimenis I updated the answer to have your request.

Philip Seimenis Over a year ago

I can get this working if I pass through the primary key as an instance. When I try the above code I am getting errors. The problem is I have multiple forms on the same page like a list

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