Add 'CableTypes' (#406)

* Move relevant fields and create migration to autogen cable types

* CRUD and ordering

* FIX: Prevent creating duplicate cable types

* FIX: pep8/remove debug print

* FIX: Meta migrations... :>

* FIX: Update tests to match new UX

* Move cabletype menu links into 'Assets' dropdown

* Fix migration

* Specify version of reportlab

Should fix CI - looks like I went a bit too ham-handed in my requirements.txt purge last time...

assets/migrations/0011_auto_20200218_1617.py

@@ -0,0 +1,29 @@
+# Generated by Django 2.0.13 on 2020-02-18 16:17
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('assets', '0010_auto_20200219_1444'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='CableType',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('circuits', models.IntegerField(blank=True, null=True)),
+                ('cores', models.IntegerField(blank=True, null=True)),
+                ('plug', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='plug', to='assets.Connector')),
+                ('socket', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='socket', to='assets.Connector')),
+            ],
+        ),
+        migrations.AddField(
+            model_name='asset',
+            name='cable_type',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='assets.CableType'),
+        ),
+    ]

assets/migrations/0012_auto_20200218_1627.py

@@ -0,0 +1,26 @@
+# Generated by Django 2.0.13 on 2020-02-18 16:27
+
+from django.db import migrations
+from django.db.models import Q
+
+
+def move_cable_type_data(apps, schema_editor):
+    Asset = apps.get_model('assets', 'Asset')
+    CableType = apps.get_model('assets', 'CableType')
+    for asset in Asset.objects.filter(is_cable=True):
+        # Only create one type per...well...type
+        if(not CableType.objects.filter(Q(plug=asset.plug) & Q(socket=asset.socket))):
+            cabletype = CableType.objects.create(plug=asset.plug, socket=asset.socket, circuits=asset.circuits, cores=asset.cores)
+            asset.save()
+            cabletype.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('assets', '0011_auto_20200218_1617'),
+    ]
+
+    operations = [
+        migrations.RunPython(move_cable_type_data)
+    ]

assets/migrations/0013_auto_20200218_1639.py

@@ -0,0 +1,29 @@
+# Generated by Django 2.0.13 on 2020-02-18 16:39
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('assets', '0012_auto_20200218_1627'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='asset',
+            name='circuits',
+        ),
+        migrations.RemoveField(
+            model_name='asset',
+            name='cores',
+        ),
+        migrations.RemoveField(
+            model_name='asset',
+            name='plug',
+        ),
+        migrations.RemoveField(
+            model_name='asset',
+            name='socket',
+        ),
+    ]

assets/migrations/0014_auto_20200218_1840.py

@@ -0,0 +1,17 @@
+# Generated by Django 2.0.13 on 2020-02-18 18:40
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('assets', '0013_auto_20200218_1639'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='cabletype',
+            options={'ordering': ['plug', 'socket', '-circuits']},
+        ),
+    ]