Move apps in main directory

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

registration/api/__init__.py

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+# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
+# SPDX-License-Identifier: GPL-3.0-or-later

registration/api/serializers.py

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+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from rest_framework import serializers
+from rest_polymorphic.serializers import PolymorphicSerializer
+
+from ..models import CoachRegistration, ParticipantRegistration, \
+    StudentRegistration, VolunteerRegistration
+
+
+class CoachSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = CoachRegistration
+        fields = '__all__'
+
+
+class ParticipantSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = ParticipantRegistration
+        fields = '__all__'
+
+
+class StudentSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = StudentRegistration
+        fields = '__all__'
+
+
+class VolunteerSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = VolunteerRegistration
+        fields = '__all__'
+
+
+class RegistrationSerializer(PolymorphicSerializer):
+    model_serializer_mapping = {
+        CoachRegistration: CoachSerializer,
+        StudentRegistration: StudentSerializer,
+        VolunteerRegistration: VolunteerSerializer,
+    }

registration/api/urls.py

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+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from .views import RegistrationViewSet
+
+
+def register_registration_urls(router, path):
+    """
+    Configure router for registration REST API.
+    """
+    router.register(path + "/registration", RegistrationViewSet)

registration/api/views.py

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+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django_filters.rest_framework import DjangoFilterBackend
+from rest_framework.viewsets import ModelViewSet
+
+from .serializers import RegistrationSerializer
+from ..models import Registration
+
+
+class RegistrationViewSet(ModelViewSet):
+    queryset = Registration.objects.all()
+    serializer_class = RegistrationSerializer
+    filter_backends = [DjangoFilterBackend]
+    filterset_fields = ['user', 'participantregistration__team', ]