How can I make the value itself be written to the database when a new row is created?

Question

Python

How can I make the value itself be written to the database when a new row is created?

I have a form where the user can enter values ​​for 4 fields out of 5. The fifth field is a date and time field. How can I make it so that the date and time is automatically written to this db row when this row is added?

html:

<form method='post' id='adding_text'>
    {% csrf_token %}
    {{ form.author }}<br>
    {{ form.title }}<br>
    {{ form.topic }}<br>
    {{ form.text }}<br>
    {{ form.date_and_time }}<br>
    <button type='submit' id='submit_button_in_adding_text_form'>Добавить</button>
  </form>

forms.py:

from .models import Texts
from django import forms
from django.forms import ModelForm

class TextsForm(ModelForm):
  class Meta:
    model = Texts
    fields = ['author', 'title', 'topic', 'text', 'date_and_time']

    widgets = {
      'author': forms.TextInput(attrs={
        'class': 'input_author input_in_adding_text',
        'placeholder': 'Текст',
        'readonly': 'readonly'
      }),
      'title': forms.TextInput(attrs={
        'class': 'input_title input_in_adding_text',
        'placeholder': 'Название текста'
      }),
      'topic': forms.TextInput(attrs={
        'class': 'input_topic input_in_adding_text',
        'placeholder': 'Тема текста',
      }),
      'text': forms.Textarea(attrs={
        'class': 'input_text input_in_adding_text',
        'placeholder': 'Текст'
      }),
      'date_and_time': forms.DateTimeInput(attrs={
        'class': 'input_date_and_time input_in_adding_text',
        'placeholder': 'Дата и время',
        'readonly': 'readonly'
      }),
    }

models.py:

class Texts(models.Model):
  author = models.CharField('Автор', max_length=50, default='Аноним')
  title = models.CharField('Название', max_length=100)
  topic = models.CharField('Тема', max_length=100, default='')
  text = models.TextField('Текст')
  date_and_time = models.DateTimeField('Дата и время')

  def __str__(self):
    return self.title

  class Meta:
    verbose_name = 'Текст'
    verbose_name_plural = 'Тексты'

views.py:

def adding_text(request):
    error = ''
    if request.method == 'POST':
        form = TextsForm(request.POST)
        if form.is_valid():
            form.save()
        else:
            error = 'Форма была заполнена неверно, повторите ввод'
            return redirect('texts')
    form = TextsForm()

    data = {
        'form': form
    }

    return render(request, 'adding_text.html', data)

Answer 1

I figured this works great:

date_and_time = models.DateTimeField(default=timezone.now)

Answer 2

I usually use these fields:

created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)

In your case, you only need to add an argument to the model