Added constraints to many to many tables

food_planner/migrations/0002_auto_20200219_1336.py

@@ -0,0 +1,25 @@
+# Generated by Django 3.0.3 on 2020-02-19 12:36
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('food_planner', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterUniqueTogether(
+            name='storedingredient',
+            unique_together={('pantry', 'ingredient')},
+        ),
+        migrations.AlterUniqueTogether(
+            name='usedingredient',
+            unique_together={('recipe', 'ingredient')},
+        ),
+        migrations.AlterUniqueTogether(
+            name='usedkitchenutility',
+            unique_together={('recipe', 'kitchen_utility')},
+        ),
+    ]

food_planner/models.py

@@ -122,6 +122,7 @@ class UsedKitchenUtility(models.Model):
                                          default=1)
     
     class Meta:
+        unique_together = ['recipe', 'kitchen_utility']
         verbose_name = _('Used kitchen utility')
         verbose_name_plural = _('Used kitchen utilities')
 
@@ -134,6 +135,7 @@ class UsedIngredient(models.Model):
     unit = models.CharField(_('Unit for amount'), max_length=10, choices=MEASUREMENT_UNITS)
     
     class Meta:
+        unique_together = ['recipe', 'ingredient']
         verbose_name = _('Used ingredient')
         verbose_name_plural = _('Used ingredients')
 
@@ -190,6 +192,7 @@ class StoredIngredient(models.Model):
                             choices=MEASUREMENT_UNITS)
     
     class Meta:
+        unique_together = ['pantry', 'ingredient']
         verbose_name = _('Stored ingredient')
         verbose_name_plural = _('Stored ingredients')