add institution relationship view

api/preprints/serializers.py

@@ -88,6 +88,7 @@ def to_internal_value(self, license_id):
 
 class PreprintSerializer(TaxonomizableSerializerMixin, MetricsSerializerMixin, JSONAPISerializer):
     filterable_fields = frozenset([
+        'affiliated_institutions',
         'id',
         'date_created',
         'date_modified',
@@ -191,9 +192,9 @@ class PreprintSerializer(TaxonomizableSerializerMixin, MetricsSerializerMixin, J
     ))
 
     affiliated_institutions = RelationshipField(
-        related_view='preprints:preprints-affiliated-institutions',
+        related_view='preprints:preprint-institution',
         related_view_kwargs={'preprint_id': '<_id>'},
-        self_view='preprints:preprints-affiliated-institutions',
+        self_view='preprints:preprint-institution',
         self_view_kwargs={'preprint_id': '<_id>'},
         read_only=False,
         required=False,

api/preprints/views.py

@@ -62,6 +62,10 @@
 from api.base.metrics import PreprintMetricsViewMixin
 from osf.metrics import PreprintDownload, PreprintView
 
+from api.institutions.serializers import InstitutionSerializer
+from osf.models import Institution
+
+
 class PreprintMixin(NodeMixin):
     serializer_class = PreprintSerializer
     preprint_lookup_url_kwarg = 'preprint_id'
@@ -614,3 +618,31 @@ def get_default_queryset(self):
 
     def get_queryset(self):
         return self.get_queryset_from_request()
+
+
+class PreprintInstitutionsList(JSONAPIBaseView, generics.ListAPIView, ListFilterMixin, PreprintMixin):
+    """The documentation for this endpoint can be found [here](https://developer.osf.io/#operation/nodes_institutions_list).
+    """
+    permission_classes = (
+        drf_permissions.IsAuthenticatedOrReadOnly,
+        base_permissions.TokenHasScope,
+        AdminOrPublic,
+    )
+
+    required_read_scopes = [CoreScopes.NODE_BASE_READ, CoreScopes.INSTITUTION_READ]
+    required_write_scopes = [CoreScopes.NULL]
+    serializer_class = InstitutionSerializer
+
+    model = Institution
+    view_category = 'preprint'
+    view_name = 'preprint-institutions'
+
+    ordering = ('-id',)
+
+    def get_resource(self):
+        return self.get_node()
+
+    def get_queryset(self):
+        resource = self.get_preprint()
+        return resource.affiliated_institutions.all() or []
+