zmiany mariusza

backend/formulas/models/__init__.py

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+from .formula import Formula
+from .symbol import Symbol
+from .category import FormulaCategory
+
+__all__ = [
+    "Formula", 
+    "Symbol", 
+    "FormulaCategory",
+]

backend/formulas/models/category.py

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+from django.db import models
+
+class FormulaCategory(models.Model):
+    name = models.CharField(max_length=100)
+    prefix = models.PositiveIntegerField(unique=True)  # cyfra `x` w kodzie xyz
+
+    class Meta:
+        verbose_name = "Kategoria wzoru"
+        verbose_name_plural = "Kategorie wzorów"
+
+    def __str__(self):
+        return f"{self.prefix} - {self.name}"

backend/formulas/models/favorite.py

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+# backend/formulas/models/favorite_formula.py
+from django.db import models
+from django.conf import settings
+from formulas.models.formula import Formula
+
+class FavoriteFormula(models.Model):
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
+    formula = models.ForeignKey(Formula, on_delete=models.CASCADE)
+    added_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        unique_together = ('user', 'formula')
+        verbose_name = "Ulubiony wzór"
+        verbose_name_plural = "Ulubione wzory"
+
+    def __str__(self):
+        return f"{self.user.username} ❤️ {self.formula.code}"

backend/formulas/models/formula.py

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+from django.db import models
+from .category import FormulaCategory
+from users.models import User
+from django.utils import timezone
+from .symbol import Symbol
+
+class Formula(models.Model):
+    formula_id = models.CharField(max_length=100)
+    title = models.CharField(max_length=255)
+    description = models.TextField(blank=True)
+    meta = models.TextField(blank=True)
+    category = models.ForeignKey(FormulaCategory, on_delete=models.PROTECT)
+    tags = models.JSONField(default=list)
+    latex = models.TextField()
+    raw_latex = models.TextField()
+    symbols = models.ManyToManyField(Symbol, related_name='formulas')
+    calculator = models.CharField(max_length=100)
+    revision = models.PositiveIntegerField(default=1)
+    code = models.CharField(max_length=10, unique=True)
+    created_by = models.ForeignKey(User, on_delete=models.SET_NULL, null=True)
+    created_at = models.DateTimeField(default=timezone.now)
+    
+
+    def save(self, *args, **kwargs):
+        if not self.code:
+            base_prefix = f"{self.category.prefix:02d}"
+            existing_codes = Formula.objects.filter(category=self.category).values_list('code', flat=True)
+            index = 1
+            while True:
+                proposed_code = f"{base_prefix}{index:02d}{self.revision:02d}"
+                if proposed_code not in existing_codes:
+                    self.code = proposed_code
+                    break
+                index += 1
+        super().save(*args, **kwargs)
+
+    def __str__(self):
+        return f"{self.title} ({self.code})"

backend/formulas/models/symbol.py

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+from django.db import models
+from .category import FormulaCategory
+
+class Symbol(models.Model):
+    symbol_id = models.CharField(max_length=10)  # np. F
+    name = models.CharField(max_length=255)
+    unit = models.CharField(max_length=50)
+    description = models.TextField(blank=True)
+    category = models.ForeignKey(FormulaCategory, on_delete=models.PROTECT)
+    tags = models.JSONField(default=list, blank=True)
+    revision = models.PositiveIntegerField(default=1)
+    code = models.CharField(max_length=10, unique=True, editable=False)
+    meta = models.TextField(blank=True)  # np. meta-opis dla SEO / edytora
+
+
+#Zaspis zmiennej z code 
+    def save(self, *args, **kwargs):
+        if not self.code:
+            count = Symbol.objects.filter(category=self.category).count() + 1
+            self.code = f"{self.category.prefix:02d}{count:02d}{self.revision:02d}"
+        super().save(*args, **kwargs)
+
+#Definiowanie czym jest "self"
+    def __str__(self):
+        return f"{self.name} ({self.symbol_id}) [{self.code}]"