Why does my Django form data not appear in the database?

Question

I try to develop a simple input form to save a deposit for a fishing vessel. The vessel and the net are tables in the database. There is no error when the form is submitted but there is nothing happening in the background. I use a PostgreSQL database with PgAdmin for insights.I am a little bit stuck since it’s my first time working with Django.

I tried adding the dep_id field into the form but it did not change anything.

[forms.py]

from django import forms
from django.forms import ModelForm
from myapp.models import Deposit


class UploadForm(ModelForm):
    dep_date = forms.DateField()
    harbour = forms.CharField()
    vessel = forms.ModelChoiceField(queryset=Vessel.objects.all())
    net = forms.ModelChoiceField(queryset=Net.objects.all())
    amount = forms.DecimalField()

    class Meta:
        model = Deposit
        fields = ['dep_date', 'harbour', 
                    'vessel', 'net', 
                    'amount']

[models.py]

from django.db import models

class Vessel(models.Model):
    VID = models.IntegerField(primary_key=True, default=None)
    vessel_name = models.CharField(max_length=100)
    flag = models.CharField(max_length=100)
    
    registration_number = models.CharField(max_length=100)
    WIN = models.CharField(max_length=100)
    IRCS = models.CharField(max_length=100)
    
    vessel_type = models.CharField(max_length=250)
    fishing_methods = models.CharField(max_length=255)
    length = models.DecimalField(default=0, max_digits=5, decimal_places=2)
    
    auth_period_from = models.CharField(max_length=100)
    auth_period_to = models.CharField(max_length=100)



class Net(models.Model):
    net_id = models.IntegerField(primary_key=True, default = None)
    prod_date = models.DateField()
    weight = models.DecimalField(default=0, max_digits=6, decimal_places=2)
    material = models.CharField(max_length=100)
    fishing_type = models.CharField(max_length=100, default=None)


class Deposit(models.Model):
    dep_id = models.BigAutoField(primary_key=True, default=None)
    dep_date = models.DateField()
    harbour = models.CharField(max_length=100)
    vessel = models.ForeignKey(Vessel, to_field='VID', on_delete=models.CASCADE)
    net = models.ForeignKey(Net, to_field='net_id', on_delete=models.CASCADE)
    amount = models.DecimalField(default=0, max_digits=5, decimal_places=2)

[views.py]

from django.shortcuts import render, redirect
from .models import Vessel
from .forms import UploadForm

def put_deposit(request):
    if request.POST:    
        form = UploadForm(request.POST)
        print(request)
        if form.is_valid():
            form.save()
        redirect(index)
    return render(request, 'upload.html', {'form' : UploadForm})

[upload.html]

<p> Upload </p>
<form method="POST" action="{% url 'put_deposit' %}" enctype="multipart/form-data"> 
    {% csrf_token %}
    
    {{form}}
    <button> Submit </button>
</form>

Maybe I have any kind of dependency wrong or is it a problem with a key?

Asked By: Klitz

||

Source

Answer 1

This is more of a troubleshooting suggestion, but hard to show in a comment. Your form might not be validating for some reason or another – add this to see if there are errors:

def put_deposit(request):
    if request.POST:    
        form = UploadForm(request.POST)
        print(request)
        if form.is_valid():
            form.save()
        else:
            print(form.errors) # add these two lines
        redirect(index)
    return render(request, 'upload.html', {'form' : UploadForm})

Answered By: Milo Persic

Answer 2

You’re using a ModelForm, but then adding fields which are already in your model to the form as if it were a regular form. You can add extra fields to your ModelForm by doing so, but since you are adding the same fields, perhaps that is why it is not validating.

Suggestion: Try

(1) What @Milo has already suggested to print out form.errors to see if the form is indeed valid or not,

(2) Change your form to:

class UploadForm(ModelForm):

    class Meta:
        model = Deposit
        fields = ['dep_date', 'harbour', 
                    'vessel', 'net', 
                    'amount']

(3) Also, although I do not think this is what is causing the error, your view has some issues. Try:

def put_deposit(request):
    form = UploadForm(request.POST or None)
    print(request.POST)
    if form.is_valid():
        form.save()
        redirect('index')
    else:
        print(form.errors)
    return render(request, 'upload.html', {'form' : form})

Answered By: raphael

Why does my Django form data not appear in the database?

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