Первая попытка модельки

.ignore/models.py

@@ -0,0 +1,39 @@
+from django.db import models
+from mptt.models import MPTTModel, TreeForeignKey
+from django.utils.text import slugify
+
+TYPE_CHOICES = (
+    ('Лист', 'Лист'),
+    ('Труба', 'Труба'),
+    ('Круг', 'Круг'),
+    ('Уголок', 'Уголок'),
+    ('Профиль', 'Профиль'),
+    ('Плита', 'Плита'),
+    ('Швеллер', 'Швеллер'),
+    ('Ребро', 'Ребро'),
+    ('Тонкий', 'Тонкий'),
+    ('Толстый', 'Толстый'),
+)
+
+class Part(models.Model):
+    name = models.CharField(max_length=255)
+    decimal_number = models.CharField(max_length=50, unique=True)
+    type = models.CharField(max_length=50, choices=TYPE_CHOICES)
+    thickness = models.FloatField(null=True, blank=True)
+    length = models.FloatField(null=True, blank=True)
+    weight = models.FloatField(null=True, blank=True)
+    cut_length = models.FloatField(null=True, blank=True)
+    number_of_punches = models.IntegerField(null=True, blank=True)
+    slug = models.SlugField(unique=True, max_length=255)
+
+    def save(self, *args, **kwargs):
+        self.slug = slugify(f"{self.name}-{self.decimal_number}")
+        super().save(*args, **kwargs)
+
+    def __str__(self):
+        return f"{self.name} ({self.decimal_number})"
+
+class ProductStructure(MPTTModel):
+    item = models.ForeignKey(Part, on_delete=models.CASCADE, related_name='structures')
+    quantity = models.FloatField()
+    parent = TreeForeignKey('self', on_delete=models.CASCADE)