Updates people_db serializers to make options requests not blow up.

This is another fix for encode/django-rest-framework#3751, which is an upstream issue that causes the OPTIONS requests to list out every possible FK for an item as possible choices. That's fine and all, except when you have thousands or millions of FKs on an item, as we pretty much always do.

cl/api/urls.py

@@ -29,7 +29,6 @@
 
 
 urlpatterns = [
-    # url(r'^api/rest/(?P<version>[v3]+)/', include(router.urls)),
     url(r'^api-auth/',
         include('rest_framework.urls', namespace='rest_framework')),
     url(r'^api/rest/(?P<version>[v3]+)/', include(router.urls)),

cl/people_db/api_serializers.py

@@ -3,68 +3,117 @@
 from cl.api.utils import DynamicFieldsModelSerializer
 from cl.people_db.models import Person, Position, RetentionEvent, \
     Education, School, PoliticalAffiliation, Source, ABARating
+from cl.search.api_serializers import CourtSerializer
 
 
 class SchoolSerializer(DynamicFieldsModelSerializer,
                        serializers.HyperlinkedModelSerializer):
+    is_alias_of = serializers.HyperlinkedRelatedField(
+        many=False,
+        view_name='school-detail',
+        read_only=True
+    )
+
     class Meta:
         model = School
 
 
 class EducationSerializer(DynamicFieldsModelSerializer,
                           serializers.HyperlinkedModelSerializer):
     school = SchoolSerializer(many=False, read_only=True)
+    person = serializers.HyperlinkedRelatedField(
+        many=False,
+        view_name='person-detail',
+        read_only=True,
+    )
 
     class Meta:
         model = Education
 
 
 class PoliticalAffiliationSerializer(DynamicFieldsModelSerializer,
                                      serializers.HyperlinkedModelSerializer):
+    person = serializers.HyperlinkedRelatedField(
+        many=False,
+        view_name='person-detail',
+        read_only=True,
+    )
+
     class Meta:
         model = PoliticalAffiliation
 
 
 class SourceSerializer(DynamicFieldsModelSerializer,
                        serializers.HyperlinkedModelSerializer):
+    person = serializers.HyperlinkedRelatedField(
+        many=False,
+        view_name='person-detail',
+        read_only=True,
+    )
+
     class Meta:
         model = Source
 
 
 class ABARatingSerializer(DynamicFieldsModelSerializer,
                           serializers.HyperlinkedModelSerializer):
+    person = serializers.HyperlinkedRelatedField(
+        many=False,
+        view_name='person-detail',
+        read_only=True,
+    )
+
     class Meta:
         model = ABARating
 
 
 class PersonSerializer(DynamicFieldsModelSerializer,
                        serializers.HyperlinkedModelSerializer):
     race = serializers.StringRelatedField(many=True)
+    sources = SourceSerializer(many=True, read_only=True)
+    aba_ratings = ABARatingSerializer(many=True, read_only=True)
+    educations = EducationSerializer(many=True, read_only=True)
     positions = serializers.HyperlinkedRelatedField(
         many=True,
         view_name='position-detail',
         read_only=True,
     )
-    educations = EducationSerializer(many=True, read_only=True)
-    political_affiliations = PoliticalAffiliationSerializer(many=True,
-                                                            read_only=True)
-    sources = SourceSerializer(many=True, read_only=True)
-    aba_ratings = ABARatingSerializer(many=True, read_only=True)
+    political_affiliations = PoliticalAffiliationSerializer(
+        many=True,
+        read_only=True
+    )
+    is_alias_of = serializers.HyperlinkedRelatedField(
+        many=False,
+        view_name='person-detail',
+        read_only=True
+    )
 
     class Meta:
         model = Person
 
 
 class RetentionEventSerializer(DynamicFieldsModelSerializer,
                                serializers.HyperlinkedModelSerializer):
+    position = serializers.HyperlinkedRelatedField(
+        many=False,
+        view_name='position-detail',
+        read_only=True,
+    )
+
     class Meta:
         model = RetentionEvent
 
 
 class PositionSerializer(DynamicFieldsModelSerializer,
                          serializers.HyperlinkedModelSerializer):
-    appointer = PersonSerializer(many=False, read_only=True)
     retention_events = RetentionEventSerializer(many=True, read_only=True)
+    person = PersonSerializer(many=False, read_only=True)
+    appointer = PersonSerializer(many=False, read_only=True)
+    supervisor = PersonSerializer(many=False, read_only=True)
+    predecessor = PersonSerializer(many=False, read_only=True)
+    school = SchoolSerializer(many=False, read_only=True)
+    court = CourtSerializer(many=False, read_only=True)
+
     # TODO: add clerks
 
     class Meta: