How to integrate and generate invoices with django?

i am new in django , i would like to integrate an invoice functionality in my pharmacy app , but i have difficulties with table relations and i also lack some inspiration , i would also like to add the elements of my database how the product, the price ... in the invoice but I don't know how to do if you can not only help me solve this but you can also give me ideas for a pharmacy application. thank you in advance!

I don't have an idea, I lack an idea to generate invoices for my models file and there

from django.db import models






class Client(models.Model):
    name = models.CharField(max_length = 30)
    date = models.DateTimeField(auto_now_add=True)
    
    
    
class Stock (models.Model):
    balance = models.IntegerField(null=True)
    date = models.DateTimeField(auto_now_add=True )
    
    
    
        

class Produit(models.Model):
    name = models.CharField(max_length=100 , verbose_name= 'Nom')
    quantite = models.IntegerField(null=True , verbose_name= 'Quantité')
    price = models.IntegerField(null=True , verbose_name = 'Prix')
    expiration = models.DateField(null=True , verbose_name= 'Expiration')
    stock = models.ForeignKey(Stock , blank=True, null=True , on_delete= models.SET_NULL, verbose_name= 'Stock')
    date = models.DateTimeField(auto_now_add=True ,verbose_name= 'Date')
    description = models.CharField( blank= True , null= True, max_length=500 )
    
    
class Vente(models.Model):
    name = models.CharField(max_length=30)
    quantite = models.IntegerField(null=True)
    price = models.IntegerField(null=True)
    total = models.IntegerField(null=True)
    produit = models.ForeignKey(Produit,  on_delete=models.CASCADE )
    date = models.DateTimeField(auto_now_add=True )
    
    
class Facture(models.Model):
    vente = models.ForeignKey(Vente, on_delete= models.CASCADE)
    client = models.ForeignKey( Client , on_delete= models.CASCADE )  
    prix = models.IntegerField(null=True)
    produit = models.ManyToManyField(Produit)
    date = models.DateTimeField(auto_now_add=True)
       

class Paiement(models.Model):
    facture = models.ForeignKey(Facture, on_delete= models.CASCADE)
    client = models.ForeignKey(Client, on_delete= models.CASCADE)
    prix = models.IntegerField(null=True)
    date = models.DateTimeField(auto_now_add=True)
     
    
    
class Daicaissement(models.Model):
    user = models.CharField(max_length= 30)
    montant = models.IntegerField(null=True) 
    date = models.DateTimeField(auto_now_add=True)
    
 
class provisionnement(models.Model):
    produit = models.ForeignKey(Produit, on_delete= models.CASCADE)
    quantite = models.IntegerField(null=True)
    date = models.DateTimeField(auto_now_add=True)
    
    
    
    

  

          
class Conseil(models.Model):
    produit = models.ForeignKey(Produit, on_delete= models.CASCADE)
    notice = models.TextField(blank=True , null= True)
    date = models.DateTimeField(auto_now_add=True ) 
    
 
    
    def __str__(self):
        return f'{self.name , id}'

To generate invoices, you can use the information from the Vente and Facture models. The invoice should have the name of the product, the quantity sold, the unit price, the total price (quantity * unit price), and the date of sale. You can also add the client name and the date of the invoice.

The Facture model can be used to store the invoices and the relation between the invoice and the sale (vente). The relation between the client and the invoice can also be stored in this model using a ForeignKey to the Client model.

To calculate the total price, you can add a method in the Facture model that takes the relation with the Vente model and multiplies the quantity with the unit price. The result can be stored in the "prix" field.

class Facture(models.Model):
    vente = models.ForeignKey(Vente, on_delete=models.CASCADE)
    client = models.ForeignKey(Client, on_delete=models.CASCADE)
    prix = models.IntegerField(null=True)
    date = models.DateTimeField(auto_now_add=True)

    def calculate_total(self):
        self.prix = self.vente.quantite * self.vente.price
        self.save()
    
    def __str__(self):
        return f'Invoice {self.id} for client {self.client.name} on {self.date}'
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