connect vec string to operator (#1627)

* connc vec string

* remove grpc

* Apply suggestions from code review

Author: cbellot000

src/ansys/dpf/core/collection_base.py

@@ -140,6 +140,8 @@ def integral_collection(inpt, server: BaseServer = None):
             return IntCollection(inpt, server=server)
         if all(isinstance(x, (float, np.float64)) for x in inpt):
             return FloatCollection(inpt, server=server)
+        if all(isinstance(x, str) for x in inpt):
+            return StringCollection(inpt, server=server)
         else:
             raise NotImplementedError(
                 f"{IntegralCollection.__name__} is only "

tests/test_operator.py

@@ -782,6 +782,12 @@ def test_connect_get_output_double_list_operator(server_type):
     assert np.allclose(d, d_out)
 
 
+@conftest.raises_for_servers_version_under("5.0")
+def test_connect_get_output_string_list_operator(server_clayer):
+    d = ["hello", "bye"]
+    dpf.core.operators.utility.forward(d, server=server_clayer)
+
+
 def test_connect_result(plate_msup, server_type):
     model = dpf.core.Model(plate_msup, server=server_type)
     stress = model.results.stress