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Django: saving unique value without duplicate it

I'm trying to save unique name in the database but the problem I can save the same with different letters, for example I can save (IT, it, iT, It) I don't want to save it like that.
Model:
class Service(models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
name = models.CharField(max_length=127, unique=True, null=False, blank=False) # that field
is_active = models.BooleanField(default=True)
is_deleted = models.BooleanField(default=False)
created_at = models.DateTimeField(auto_now_add=True)
created_by = models.ForeignKey(
"accounts.User",
on_delete=SET_NULL,
blank=False,
null=True,
related_name="service_created_by",
)
def __str__(self):
return f"{self.name}"

A very simple solution:
class Service(models.Model):
name = models.CharField(max_length=50, unique=True)
....
def clean(self):
self.name = self.name.capitalize()

this one helped me
class Service(models.Model):
name = models.CharField(max_length=50, unique=True, null=False, blank=False)
....
class Meta:
constraints = [
models.UniqueConstraint(Lower("name"), name="unique_name"),
]
def clean(self):
self.name = self.name.capitalize()

django ForeignKey field should only select by category

I have a ForeignKey field in my model and in Django admin and Django forms` when I display that field or in Django admin, I get all the field that in that model However, I only want to display selected fields in that dropdown, for example
class Area(models.Model):
area_type_options = (('cc', 'Cost Center'), ('pc', 'Profit Center'),)
name = models.CharField(max_length=100)
area_type = models.CharField(max_length=100, choices=area_type_options)
class Item(models.Model):
name = models.CharField(max_length=150, null=True, unique=True)
profit_center = models.ForeignKey(Area, null=True, blank=True, on_delete=models.CASCADE, related_name='profit_center')
cost_center = models.ForeignKey(Area, null=True, blank=True, on_delete=models.CASCADE, related_name='cost_center')
I get to see all the records in the cost_center and all the records in the profit_center however I only want to see where area_type is cc to cost_center and where area type pc to profit_center
Please Help

You can use ForeignKey.limit_choices_to [Django docs] to do this:
class Item(models.Model):
name = models.CharField(max_length=150, null=True, unique=True)
profit_center = models.ForeignKey(Area, null=True, blank=True, on_delete=models.CASCADE, related_name='profit_center', limit_choices_to={'area_type': 'pc'})
cost_center = models.ForeignKey(Area, null=True, blank=True, on_delete=models.CASCADE, related_name='cost_center', limit_choices_to={'area_type': 'cc')

Add custom filename django model (models.FileField)

I have a model for my user and another model for music style. In my model of musical styles, I need to put the image under a name other than the original name.
The new name I would like is the 'email of the user who is saving' + '_' + 'milliseconds'.
Staying in this format:
'test#gmail.com_1621196336'
Model User:
class CustomUser(AbstractUser):
username = None
id = models.UUIDField(primary_key=True, unique=True, default=uuid.uuid4, editable=False, null=False)
email = models.EmailField('E-mail', unique=True, null=False)
Model Music Styles:
class MusicStyle(models.Model):
id = models.UUIDField(primary_key=True, unique=True, default=uuid.uuid4, editable=False, null=False)
name = models.CharField(max_length=150, null=False, blank=False)
image_link = models.FileField(upload_to='musics/thumbnail_images/##CUSTOM_NAME##')
Musical style is in a different model from the user model.
How to do this?

i didnt understand what the field with milliseconde is or what is supposed to do so i replaced it with with email and music_style name, here is how you can name your images, you can adjust it as you want
def upload_location(instance, filename):
filebase, extension = filename.split('.')
return 'musics/thumbnail_images/%s_%s.%s' % (instance.user.email,instance.name, extension)
class MusicStyle(models.Model):
user = models.ForeignKey(CustomUser, on_delete=models.CASCADE)
name = models.CharField(max_length=150, null=False, blank=False)
image_link = models.FileField(upload_to=upload_location)

If you want to set custom filename for your files you can do this:
def image_upload_to(instance, filename):
# You can access to your model fields with instance for example: instance.name
return f"musics/thumbnail_images/{filename}"
class MusicStyle(models.Model):
id = models.UUIDField(primary_key=True, unique=True, default=uuid.uuid4, editable=False, null=False)
name = models.CharField(max_length=150, null=False, blank=False)
image_link = models.FileField(upload_to=image_upload_to)

Custom id AutoField in Django model

i want create a custom field with AutoField
description:
Code generated by the system is increasing gradually, the code consists of 5 digits, there are no 2 identical codes. For example: 00001, 00002
this is my code :
class Supplier(models.Model):
code = models.AutoField(primary_key=True, max_length=5, blank=False, null=False)
name = models.CharField(max_length=200, blank=False, null=False)
phone = models.CharField(max_length=11, unique=True, validators=[len_phone])
email = models.EmailField(blank=True, null=True, unique=True)
address = models.CharField(max_length=200, blank=False, null=False)

create custom role in django to employees

I have created a role model for Employee so that employee will be assigned to control
the overall app based on his/her role. I mean if the role of employee is given can_create_only, then the employee should be able to create inventory, orders, items etc and if employee is given can_create_edit_and_delete, then the employee would be like one of the admin and etc. For this I have designed the model as below but I want to know what is the best way to handle such and why?
Should I go with middleware or decorator way? Can anyone give me an example, please?
class Role(models.Model):
name = models.CharField(max_length=100, blank=False, null=False)
class Meta:
verbose_name = 'Role'
verbose_name_plural = 'Roles'
class Employee(models.Model):
office = models.ForeignKey(
OfficeSetup, blank=False, null=False, on_delete=models.CASCADE)
name = models.CharField(max_length=150, blank=False, null=False)
designation = models.ForeignKey(Designation, blank=False, null=False)
section = models.ForeignKey(DepartmentSetup, blank=True, null=True)
phone_number = models.CharField(max_length=150, blank=True, null=True)
mobile_number = models.CharField(max_length=150, blank=True, null=True)
email = models.EmailField(max_length=150, blank=False, null=False)
gender = models.CharField(
max_length=4, choices=GENDER, blank=True, null=True)
role = models.ForeignKey(Role, blank=True, null=True)
username = models.CharField(max_length=100, blank=False, null=False)
password = models.CharField(max_length=100, blank=False, null=False)
avatar = models.ImageField(
null=True, blank=True, upload_to=upload_employee_image_path)
class Meta:
verbose_name = 'Employee'
verbose_name_plural = 'Employees'
def __str__(self):
return self.name
When creating an employee by admin, the username, password and email, the admin provides will create a new user instance along with the employee

Django comes with Groups and permissions which provides all most everything you are looking for.
This may help you - How do I use Django groups and permissions?
Django documentation - https://docs.djangoproject.com/en/1.11/topics/auth/