Unable to add data from admin panel to webpage in django-CodePudding

I was trying to add data dynamically from admin to my HTML page in django but when I try to add data in admin panel it is not showing anything in the HTML file. when I do makemigrations i am getting this below

You are trying to add a non-nullable field 'link' to researchpaper without a default; we can't do that (the database needs something to populate existing rows).
Please select a fix:
 1) Provide a one-off default now (will be set on all existing rows with a null value for this column)
 2) Quit, and let me add a default in models.py
Select an option:

In admin panel I am getting this error

models.py

from django.db import models

class researchpaper(models.Model):
    title = models.CharField(max_length=300)
    publication = models.CharField(max_length=200)
    link = models.CharField(max_length=300)
    authors = models.CharField(max_length=200)
    year = models.DateField("date published")

views.py

def publications(request):
    data = researchpaper.objects.all()
    return render(request, 'lab/publications.html',context={
       "datas": data 
    })

urls.py

path('publications', views.publications, name='publications'),

HTML file


                {% for public in datas %}
                <tr>
                    <td>
                        <h5>2021</h5>
                        <p style="color: black;"><b>{{public.title}}</b></p>
                        <p style="font-size: 14px;"><i>{{public.publications}}</i></p>
                        <p style="font-size: 14px;"><i>{{public.author}}</i></p>
                    </td>
                    <td><a href="#"
                            target="blank" style="color: dodgerblue;"><i class="ai ai-google-scholar-square ai-2x"
                                style="padding-right: 10px;"></i></a></td>
                </tr>
                <tr>
                    <td>
                        <hr>
                    </td>
                </tr>
                {% endfor %}

why I am getting this problem please help

snapshot of migrations

CodePudding user response：

Choose the first option and it will appear again, Choose it again and add dummy data like "R", if this doesn't work try to delete all migration file except __init__ file as well remove db.sqlite3 file if you use SQLite.