user setting default ingredient unit

cookbook/migrations/0032_userpreference_default_unit.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.0.4 on 2020-04-13 20:34
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('cookbook', '0031_auto_20200407_1841'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='userpreference',
+            name='default_unit',
+            field=models.CharField(default='g', max_length=32),
+        ),
+    ]