added unique constraints

cookbook/migrations/0191_foodnutrition_food_nutrition_unique_per_space_and_more.py

@@ -0,0 +1,21 @@
+# Generated by Django 4.1.7 on 2023-02-24 21:15
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('cookbook', '0190_nutritiontype_foodnutrition'),
+    ]
+
+    operations = [
+        migrations.AddConstraint(
+            model_name='foodnutrition',
+            constraint=models.UniqueConstraint(fields=('food', 'nutrition_type', 'space'), name='food_nutrition_unique_per_space'),
+        ),
+        migrations.AddConstraint(
+            model_name='nutritiontype',
+            constraint=models.UniqueConstraint(fields=('space', 'name'), name='nutrition_type_unique_name_per_space'),
+        ),
+    ]

cookbook/models.py

@@ -751,6 +751,11 @@ class NutritionType(models.Model, PermissionModelMixin):
     def __str__(self):
         return f'{self.name}'
 
+    class Meta:
+        constraints = [
+            models.UniqueConstraint(fields=['space', 'name'], name='nutrition_type_unique_name_per_space')
+        ]
+
 
 class FoodNutrition(models.Model, PermissionModelMixin):
     food_amount = models.DecimalField(default=0, decimal_places=2, max_digits=32)
@@ -765,6 +770,11 @@ class FoodNutrition(models.Model, PermissionModelMixin):
     def __str__(self):
         return f'{self.food_amount} {self.food_unit} {self.food}: {self.nutrition_amount} {self.nutrition_type.unit} {self.nutrition_type.name}'
 
+    class Meta:
+        constraints = [
+            models.UniqueConstraint(fields=['food', 'nutrition_type', 'space'], name='food_nutrition_unique_per_space')
+        ]
+
 
 class NutritionInformation(models.Model, PermissionModelMixin):
     fats = models.DecimalField(default=0, decimal_places=16, max_digits=32)