Add User field to models

Support for multiple users !

nummi/main/models.py

@@ -7,9 +7,19 @@ from django.db import models
 from django.forms import ModelForm
 from django.urls import reverse
 from django.utils.translation import gettext as _
+from django.contrib.auth.models import User
 
 
-class Category(models.Model):
+class UserModel(models.Model):
+    user = models.ForeignKey(
+        User, on_delete=models.CASCADE, verbose_name=_("User"), editable=False
+    )
+
+    class Meta:
+        abstract = True
+
+
+class Category(UserModel):
     id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
     name = models.CharField(
         max_length=64, default=_("Category"), verbose_name=_("Name")
@@ -48,7 +58,7 @@ class CategoryForm(ModelForm):
         fields = ["name", "icon", "budget"]
 
 
-class Transaction(models.Model):
+class Transaction(UserModel):
     id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
     name = models.CharField(
         max_length=256, default=_("Transaction"), verbose_name=_("Name")
@@ -121,7 +131,7 @@ def invoice_path(instance, filename):
     return pathlib.Path("invoices", str(instance.id)).with_suffix(".pdf")
 
 
-class Invoice(models.Model):
+class Invoice(UserModel):
     id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
     name = models.CharField(
         max_length=256, default=_("Invoice"), verbose_name=_("Name")
@@ -177,7 +187,7 @@ def snapshot_path(instance, filename):
     return pathlib.Path("snapshots", str(instance.id)).with_suffix(".pdf")
 
 
-class Snapshot(models.Model):
+class Snapshot(UserModel):
     id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
     date = models.DateField(default=date.today, unique=True, verbose_name=_("Date"))
     value = models.DecimalField(