Fixed models and add frequency to scholarship

backend/migrations/0004_auto_20180910_1834.py

+# Generated by Django 2.0.3 on 2018-09-10 16:34
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('backend', '0003_auto_20180910_1731'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='universityinfo',
+            name='costs_currency',
+            field=models.ForeignKey(default='EUR', on_delete=django.db.models.deletion.PROTECT, to='backend.Currency'),
+        ),
+    ]

backend/migrations/0005_auto_20180910_1846.py

+# Generated by Django 2.0.3 on 2018-09-10 16:46
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('backend', '0004_auto_20180910_1834'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='countryscholarship',
+            name='frequency',
+            field=models.CharField(choices=[('w', 'week'), ('m', 'month'), ('s', 'semester'), ('y', 'year'), ('o', 'one_shot')], default='m', max_length=1),
+        ),
+        migrations.AddField(
+            model_name='universityscholarship',
+            name='frequency',
+            field=models.CharField(choices=[('w', 'week'), ('m', 'month'), ('s', 'semester'), ('y', 'year'), ('o', 'one_shot')], default='m', max_length=1),
+        ),
+    ]

backend/models/abstract/scholarship/scholarship.py

@@ -4,11 +4,25 @@ from backend.models.currency import Currency
 from rest_framework import serializers
 from django.core.validators import MinValueValidator
 
+SCHOLARSHIP_FREQUENCIES = (
+    ('w', 'week'),
+    ('m', 'month'),
+    ('s', 'semester'),
+    ('y', 'year'),
+    ('o', 'one_shot')
+)
+
 
 class Scholarship(BasicModule):
 
     type = models.CharField(max_length=200)
     currency = models.ForeignKey(Currency, on_delete=models.PROTECT)
+    frequency = models.CharField(
+        max_length=1,
+        choices=SCHOLARSHIP_FREQUENCIES,
+        default='m',
+    )
+
     amount_min = models.DecimalField(
         max_digits=20,
         decimal_places=2,

backend/models/university/universityInfo.py

@@ -26,7 +26,7 @@ class UniversityInfo(BasicModule):
         null=True
     )
 
-    costs_currency = models.ForeignKey(Currency, on_delete=models.PROTECT)
+    costs_currency = models.ForeignKey(Currency, on_delete=models.PROTECT, default='EUR')
 
     @classmethod
     def get_serializer(cls):