Fix bugs in model

apps/map/migrations/0039_auto_20180328_0245.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.6 on 2018-03-28 02:45
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('map', '0038_auto_20180328_0146'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='casestudy',
+            name='type_of_extraction',
+            field=models.CharField(blank=True, choices=[('SUR', 'Surface (open pit/open cast/open cut mining'), ('SUB', 'Sub-surface (underground mining)'), ('SEA', 'Seabed mining'), ('URB', 'Urban mining/recycling')], default=None, max_length=3, null=True, verbose_name='Type of extraction'),
+        ),
+        migrations.AlterField(
+            model_name='casestudy',
+            name='use_in_energy_economy',
+            field=models.CharField(blank=True, choices=[('WTM', 'Wind turbine manufacturing'), ('SPM', 'Solar panel manufacturing'), ('STM', 'Solar thermal system manufacturing'), ('HGM', 'Hydropower generator manufacturing'), ('GGM', 'Geothermal generator manufacturing'), ('ESS', 'Energy storage (inc. battery systems)'), ('OTR', 'Others')], default=None, help_text='Select the potential use of the minerals in the renewable energy economy', max_length=3, null=True, verbose_name='Potential use in renewable energy economy'),
+        ),
+    ]

apps/map/migrations/0040_auto_20180328_0309.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.6 on 2018-03-28 03:09
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('map', '0039_auto_20180328_0245'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='casestudy',
+            name='type_of_extraction',
+            field=models.CharField(blank=True, choices=[('SUR', 'Surface (open pit/open cast/open cut mining)'), ('SUB', 'Sub-surface (underground mining)'), ('SEA', 'Seabed mining'), ('URB', 'Urban mining/recycling')], default=None, max_length=3, null=True, verbose_name='Type of extraction'),
+        ),
+    ]