Fix schema generation with OneToOneFields (#81)

* Fix: OneToOneRel, used by OneToOneField doesn't have help_text nor primary_key attributes, thus breaking OpenAPISchemaGenerator; use hasattr() as safe-guard.
* Fix: use getattr() with a default value instead of hasattr() + acessing the value
* Add: 'people' app that breaks drf_yasg without previous commits
* Update tests/references.yaml + run isort and flake8
* Fix: set on_delete for Person.identity as Django-2+ requires it

testproj/people/apps.py

@@ -0,0 +1,5 @@
+from django.apps import AppConfig
+
+
+class PeopleConfig(AppConfig):
+    name = 'people'

testproj/people/migrations/0001_initial.py

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+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.10 on 2018-03-18 16:22
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Identity',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('firstName', models.CharField(max_length=30, null=True)),
+                ('lastName', models.CharField(max_length=30, null=True)),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Person',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('Identity', models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, related_name='person', to='people.Identity')),
+            ],
+        ),
+    ]

testproj/people/migrations/0002_auto_20180318_1704.py

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+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.10 on 2018-03-18 17:04
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('people', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='person',
+            name='Identity',
+            field=models.OneToOneField(on_delete=django.db.models.deletion.PROTECT, related_name='person', to='people.Identity'),
+        ),
+    ]

testproj/people/models.py

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+from django.db import models
+
+
+class Identity(models.Model):
+    firstName = models.CharField(max_length=30, null=True)
+    lastName = models.CharField(max_length=30, null=True)
+
+
+class Person(models.Model):
+    Identity = models.OneToOneField(Identity, related_name='person',
+                                    on_delete=models.PROTECT)

testproj/people/serializers.py

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+from rest_framework import serializers
+
+from .models import Identity, Person
+
+
+class IdentitySerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Identity
+        fields = '__all__'
+
+
+class PersonSerializer(serializers.ModelSerializer):
+    identity = IdentitySerializer(read_only=True)
+
+    class Meta:
+        model = Person
+        fields = '__all__'
+
+    def create(self, validated_data):
+        identity = Identity(**validated_data['identity'])
+        identity.save()
+        validated_data['identity'] = identity
+        return super().create(validated_data)

testproj/people/urls.py

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+from django.conf.urls import url
+
+from .views import IdentityViewSet, PersonViewSet
+
+person_list = PersonViewSet.as_view({
+    'get': 'list',
+    'post': 'create'
+})
+person_detail = PersonViewSet.as_view({
+    'get': 'retrieve',
+    'patch': 'partial_update',
+    'delete': 'destroy'
+})
+
+identity_detail = IdentityViewSet.as_view({
+    'get': 'retrieve',
+    'patch': 'partial_update',
+})
+
+urlpatterns = (
+    url(r'^$', person_list, name='people-list'),
+    url(r'^(?P<pk>[0-9]+)$', person_detail, name='person-detail'),
+
+    url(r'^(?P<person>[0-9]+)/identity$', identity_detail,
+        name='person-identity'),
+)

testproj/people/views.py

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+from rest_framework import viewsets
+
+from .models import Identity, Person
+from .serializers import IdentitySerializer, PersonSerializer
+
+
+class PersonViewSet(viewsets.ModelViewSet):
+    model = Person
+    queryset = Person.objects
+    serializer_class = PersonSerializer
+
+
+class IdentityViewSet(viewsets.ModelViewSet):
+    model = Identity
+    queryset = Identity.objects
+    serializer_class = IdentitySerializer