Wednesday, June 5, 2019

Re: While registering the user with django form, it gives "UNIQUE constraint failed: auth_user.username" error

I wrote a python script to easily reset a django project. I hope it helps you.
Just put it in the folder where manage.py file is and run it.


import os
import shutil

from pprint import pprint


folders = []
base_dir = os.path.dirname(os.path.realpath(__file__))


def get_directory_list():
global folders
global base_dir

for root, d_names, f_names in os.walk(base_dir):
for name in d_names:
folders.append(os.path.join(root, name))
folders = sorted(folders)
return folders


def delete_pycache():
global folders

for folder in folders:
if folder.endswith("__pycache__"):
shutil.rmtree(folder)

print("All __pycache__ files deleted.")
return None


def delete_migrations():
global folders

for folder in folders:
if folder.endswith("migrations"):
for item in os.listdir(folder):
if not item.endswith("__init__.py"):
os.remove(os.path.join(folder, item))

print("All migration files deleted.")
return None


def delete_sqlite3():
global base_dir
db_file = os.path.join(base_dir, "default.sqlite3")
if os.path.exists(db_file):
os.remove(db_file)


def main():
global folders

try:
get_directory_list()
delete_pycache()
delete_migrations()
delete_sqlite3()
print("All operations performed successfully.")
except Exception as e:
print("There was some error")


if __name__ == "__main__":
main()


Regards,
Chetan Ganji
+91-900-483-4183


On Wed, Jun 5, 2019 at 6:29 PM Chandrashekhar Singh <chandrashekhar721@gmail.com> wrote:
Better will be, delete all migrations, and again migrate

On Fri, May 17, 2019, 12:51 PM RAJENDRA MYTHILI 17BIS0120 <rajendra.mythili2017@vitstudent.ac.in> wrote:
I'm facing the same issue ... Did you figure out what's wrong?

On Saturday, October 6, 2018 at 6:28:09 AM UTC-7, Jaydeep Borkar wrote:
When I try to register a user using Django form, it gives me "UNIQUE constraint failed: auth_user.username". When I tried registering the first user, it worked, but I couldn't see that entry in my database. When I tried registering the second user, it's giving me this error. Please, help me through this. I have spent a considerable amount of time on this and I'm stuck. 

This is my code: 

forms.py 
from django import forms
from django.contrib.auth.models import User
from volunteer.models import UserProfileInfo

class UserForm(forms.ModelForm):

    class Meta():
        model = User
        fields = ('email','first_name','last_name')




views.py 
from django.shortcuts import render
from volunteer.forms import UserForm

 

def register(request):

    registered = False

    if request.method =="POST" :
        user_form = UserForm(data=request.POST)

        if user_form.is_valid():

            user = user_form.save()
            user.save()

            registered = True

        else:
            print(user_form.errors)

    else:
        user_form = UserForm()

    return render(request, 'volunteer/volunteer.html',
                             {'user_form':user_form,
                              'registered':registered})

     
          


        



models.py 
from django.db import models
from django.contrib.auth.models import User

class UserProfileInfo(models.Model):

        user=models.OneToOneField(User)

        def __str__(self):
                return self.user.first_name
                return self.user.last_name
                return self.user.email







urls.py
from django.conf.urls import url

from . import views

app_name = 'volunteer'

urlpatterns = [

     url(r'^', views.register, name='register'),
]



admin.py
from django.contrib import admin
from volunteer.models import UserProfileInfo

# Register your models here.
admin.site.register(UserProfileInfo)



volunteer.html file which has the user form
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
 
 
<meta name="viewport" content = "width=device-width, initial-scale=1.0">

 
 
</head>  
 
<body>  

     <div class="jumbotron">
    {% if registered %}
   <h1>Thanks!</h1>
{% else %}
  <h1>Register</h1>


     <form method="post">
    {% csrf_token %}
{{ user_form.as_p }}
     <input type="submit" name="" value="Register">

     {% endif %}

     </div> 

     
     </form>

</body>
</html> 



I feel there's some problem in views.py or models.py, or volunteer.html. or maybe something else. Please, guide me through this. 
Thanks in advance. 

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