CODEWITHSUNDEEP
djangodjango-modelsdjango-viewsdjango-formsdjango-templates
Sukumar
Sukumar

Reputation: 75

Generating automatic user registration number using django

What i wanted to achieve? I wanted to achieve {Company Letter}- {Country Code}-{1st Letter of 1st Name}{1st Letter of Last Name}-{000001-999999} For example: Company Name: Stack Overflow Username: Stack Overflow Country is USA SO - 001 - SO - 000001

The Registration numbers will start from ONE when i choose different countries.. For example USA the registration number will start from (000001-999999), for UK (000001-999999) and so on...

For that i have created a country, state and city model. I have created a custom user model. In the custom user model, i am using country, state, city drop down.

So there is one field called registration numbers.. How can i generate registration number after registering one user..

Code:

from django.utils.translation import ugettext_lazy as _
from smart_selects.db_fields import ChainedForeignKey

class Country(models.Model):
    name = models.CharField(_('Country'), max_length=255, null=True)
    country_code = models.CharField(_('Code'), max_length=10, null=True)
    iso_code_short = models.CharField(_('ISO Code Short'), max_length=2, null=True)
    iso_code_long = models.CharField(_('ISO Code Long'), max_length=3, null=True)
    
def __str__(self):
        return self.name

class State(models.Model):
    country = models.ForeignKey(Country, on_delete=models.CASCADE)
    name = models.CharField(_('State'), max_length=255, null=True)

    def __str__(self):
        return str(self.name)

class City(models.Model):
    country = models.ForeignKey(Country, on_delete=models.CASCADE)
    state = ChainedForeignKey('State', chained_field="country", chained_model_field="country", show_all=False, auto_choose=True)
    name = models.CharField(_('City'), max_length=255)

    def __str__(self):
        return str(self.name)

Custom User Model

class CustomUser(AbstractUser):
    username = None
    email = models.EmailField(_('Email'), max_length=255, unique=True)
    first_name = models.CharField(_('First Name'), max_length=100)
    last_name = models.CharField(_('Last Name'), max_length=100)
    registration_no = models.CharField(_('Registration Number'), max_length=50, null=True, blank=True)
    country = models.ForeignKey(Country, on_delete=models.SET_NULL)
    state = ChainedForeignKey(State, chained_field="country", chained_model_field="country", show_all=False, auto_choose=True)
    city = ChainedForeignKey(City, chained_field="state", chained_model_field="state", show_all=False, auto_choose=True)
    active = models.BooleanField(default=True)
    staff = models.BooleanField(default=False)
    admin = models.BooleanField(default=False)

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []

Please guide me..

Upvotes: 0

Views: 600

Answers (1)

fannik
fannik

Reputation: 1153

It's a very simple answer: continue using Django and Python.

You just need a concatenation constructions, something like: f"{company.letter}-{country.code}..." etc.

So create all your models with proper fields and methods, then create the registration_number field to store a new registration id and create the value for it on instance's .save() method.

Upvotes: 1

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