Several changes to models

Add __str__ methods with unicode compatibility.

Make trainer fields optional as they should be.
Include these migrations and apply to DB.

Install some test data in the DB.

training/migrations/0002_required_fields.py

@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+from django.conf import settings
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('training', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='trainingrecord',
+            name='assessed_trainer',
+            field=models.ForeignKey(related_name='trainingrecords_assessed', blank=True, to=settings.AUTH_USER_MODEL, null=True),
+        ),
+        migrations.AlterField(
+            model_name='trainingrecord',
+            name='completed_trainer',
+            field=models.ForeignKey(related_name='trainingrecords_completed', blank=True, to=settings.AUTH_USER_MODEL, null=True),
+        ),
+        migrations.AlterField(
+            model_name='trainingrecord',
+            name='started_trainer',
+            field=models.ForeignKey(related_name='trainingrecords_started', blank=True, to=settings.AUTH_USER_MODEL, null=True),
+        ),
+    ]

training/models.py

@@ -1,16 +1,22 @@
 from django.db import models
 from django.conf import settings
+from django.utils.encoding import python_2_unicode_compatible
 import reversion
 
 # Create your models here.
 
 
+@python_2_unicode_compatible
 @reversion.register
 class TrainingCategory(models.Model):
     category_number = models.PositiveSmallIntegerField()
     category_name = models.CharField(max_length=50)
 
+    def __str__(self):
+        return "{0}: {1}".format(self.category_number, self.category_name)
 
+
+@python_2_unicode_compatible
 @reversion.register
 class TrainingItem(models.Model):
     category = models.ForeignKey(TrainingCategory)
@@ -19,26 +25,34 @@ class TrainingItem(models.Model):
     training_records = models.ManyToManyField(settings.AUTH_USER_MODEL,
                                               through='TrainingRecord', through_fields=('training_item', 'trainee'))
 
+    def __str__(self):
+        return "{0}.{1}: {2}".format(self.category.category_number, self.item_number, self.item_name)
 
+
+@python_2_unicode_compatible
 @reversion.register
 class TrainingRecord(models.Model):
     trainee = models.ForeignKey(settings.AUTH_USER_MODEL)
     training_item = models.ForeignKey(TrainingItem)
 
     started_date = models.DateField(blank=True, null=True)
-    started_trainer = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='trainingrecords_started')
+    started_trainer = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='trainingrecords_started', blank=True, null=True)
     started_notes = models.TextField(blank=True, null=True)
     completed_date = models.DateField(blank=True, null=True)
-    completed_trainer = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='trainingrecords_completed')
+    completed_trainer = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='trainingrecords_completed', blank=True, null=True)
     completed_notes = models.TextField(blank=True, null=True)
     assessed_date = models.DateField(blank=True, null=True)
-    assessed_trainer = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='trainingrecords_assessed')
+    assessed_trainer = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='trainingrecords_assessed', blank=True, null=True)
     assessed_notes = models.TextField(blank=True, null=True)
 
+    def __str__(self):
+        return "{0} - {1}".format(self.trainee, self.training_item)
+
     class Meta:
         unique_together = ('trainee', 'training_item')
 
 
+@python_2_unicode_compatible
 @reversion.register
 class TrainingLevelRecord(models.Model):
     trainee = models.ForeignKey(settings.AUTH_USER_MODEL)
@@ -55,3 +69,6 @@ class TrainingLevelRecord(models.Model):
     power_supervisor = models.DateField(blank=True, null=True)
 
     haulage_supervisor = models.DateField(blank=True, null=True)
+
+    def __str__(self):
+        return "{0}".format(self.trainee)