Make select_300 boolean field

app/migrations/0053_alter_mountainrange_select_300.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.0.1 on 2022-01-13 04:15
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('app', '0052_alter_mountainrange_select_300'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='mountainrange',
+            name='select_300',
+            field=models.BooleanField(default=False),
+        ),
+    ]

app/models.py

@@ -119,7 +119,7 @@ class MountainRange(models.Model):
     gmba_v2_id_str = models.TextField(blank=True, null=True)
     wiki_data_id = models.CharField(blank=True, null=True, max_length=25)
     wiki_data_url = models.TextField(blank=True, null=True)
-    select_300 = models.BooleanField(blank=True, null=True, max_length=12)
+    select_300 = models.BooleanField(default=False)
     gmba_narrow = models.CharField(blank=True, null=True, max_length=12)
     name_fr = models.CharField(blank=True, null=True, max_length=128)
     name_de = models.CharField(blank=True, null=True, max_length=128)