Set backref labels

Fixes #6

ccdb/species/migrations/0006_set_labels.py

@@ -0,0 +1,34 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('species', '0005_DATA_species_collection'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='collectionspecies',
+            name='collection',
+            field=models.ForeignKey(related_name='collection_species', to='collections_ccdb.Collection'),
+        ),
+        migrations.AlterField(
+            model_name='collectionspecies',
+            name='species',
+            field=models.ForeignKey(related_name='collection_species', to='species.Species'),
+        ),
+        migrations.AlterField(
+            model_name='trapspecies',
+            name='collection_trap',
+            field=models.ForeignKey(related_name='trap_species', to='collections_ccdb.CollectionTrap'),
+        ),
+        migrations.AlterField(
+            model_name='trapspecies',
+            name='species',
+            field=models.ForeignKey(related_name='trap_species', to='species.Species'),
+        ),
+    ]

ccdb/species/models.py

@@ -21,8 +21,9 @@ class Species(models.Model):
 
 
 class TrapSpecies(models.Model):
-    collection_trap = models.ForeignKey('collections_ccdb.CollectionTrap')
-    species = models.ForeignKey(Species)
+    collection_trap = models.ForeignKey('collections_ccdb.CollectionTrap',
+                                        related_name='trap_species')
+    species = models.ForeignKey(Species, related_name='trap_species')
     sex = models.CharField(max_length=25, blank=True)
     count = models.IntegerField(blank=True, null=True)
     count_estimated = models.BooleanField(default=False)
@@ -35,8 +36,9 @@ class TrapSpecies(models.Model):
 
 
 class CollectionSpecies(models.Model):
-    collection = models.ForeignKey('collections_ccdb.Collection')
-    species = models.ForeignKey(Species)
+    collection = models.ForeignKey('collections_ccdb.Collection',
+                                   related_name='collection_species')
+    species = models.ForeignKey(Species, related_name='collection_species')
     sex = models.CharField(max_length=25, blank=True)
     count = models.IntegerField(blank=True, null=True)
     count_estimated = models.BooleanField(default=False)