Examples: Fix Types of Constants & Attributes

Backports from openPMD#1316 and openPMD#1510

Author: ax3l

CHANGELOG.rst

@@ -19,6 +19,7 @@ Bug Fixes
 """""""""
 
 - Don't require unitSI when reading a patch record component #1470
+- Examples: Fix types of particle constant records #1316 #1510
 - Python:
 
   - DataFrame to ASCII: Header of First Column in CSV bug documentation third party

examples/7_extended_write_serial.cpp

@@ -83,8 +83,9 @@ int main()
                 {{io::UnitDimension::M, 1}});
             electrons["displacement"]["x"].setUnitSI(1e-6);
             electrons.erase("displacement");
-            electrons["weighting"][io::RecordComponent::SCALAR].makeConstant(
-                1.e-5);
+            electrons["weighting"][io::RecordComponent::SCALAR]
+                .resetDataset({io::Datatype::FLOAT, {1}})
+                .makeConstant(1.e-5);
         }
 
         io::Mesh mesh = cur_it.meshes["lowRez_2D_field"];

examples/7_extended_write_serial.py

@@ -90,7 +90,9 @@
     electrons["displacement"].unit_dimension = {Unit_Dimension.M: 1}
     electrons["displacement"]["x"].unit_SI = 1.e-6
     del electrons["displacement"]
-    electrons["weighting"][SCALAR].make_constant(1.e-5)
+    electrons["weighting"][SCALAR] \
+        .reset_dataset(Dataset(np.dtype("float32"), extent=[1])) \
+        .make_constant(1.e-5)
 
     mesh = cur_it.meshes["lowRez_2D_field"]
     mesh.axis_labels = ["x", "y"]

test/CoreTest.cpp

@@ -25,6 +25,8 @@
 
 using namespace openPMD;
 
+Dataset globalDataset(Datatype::CHAR, {1});
+
 TEST_CASE("versions_test", "[core]")
 {
     auto const apiVersion = getVersion();
@@ -439,11 +441,11 @@ TEST_CASE("record_constructor_test", "[core]")
     ps["position"][RecordComponent::SCALAR].resetDataset(dset);
     ps["positionOffset"][RecordComponent::SCALAR].resetDataset(dset);
 
-    REQUIRE(r["x"].unitSI() == 1);
+    REQUIRE(r["x"].resetDataset(dset).unitSI() == 1);
     REQUIRE(r["x"].numAttributes() == 1); /* unitSI */
-    REQUIRE(r["y"].unitSI() == 1);
+    REQUIRE(r["y"].resetDataset(dset).unitSI() == 1);
     REQUIRE(r["y"].numAttributes() == 1); /* unitSI */
-    REQUIRE(r["z"].unitSI() == 1);
+    REQUIRE(r["z"].resetDataset(dset).unitSI() == 1);
     REQUIRE(r["z"].numAttributes() == 1); /* unitSI */
     std::array<double, 7> zeros{{0., 0., 0., 0., 0., 0., 0.}};
     REQUIRE(r.unitDimension() == zeros);
@@ -488,13 +490,15 @@ TEST_CASE("recordComponent_modification_test", "[core]")
 
     r["x"].setUnitSI(2.55999e-7);
     r["y"].setUnitSI(4.42999e-8);
-    REQUIRE(r["x"].unitSI() == static_cast<double>(2.55999e-7));
+    REQUIRE(
+        r["x"].resetDataset(dset).unitSI() == static_cast<double>(2.55999e-7));
     REQUIRE(r["x"].numAttributes() == 1); /* unitSI */
-    REQUIRE(r["y"].unitSI() == static_cast<double>(4.42999e-8));
+    REQUIRE(
+        r["y"].resetDataset(dset).unitSI() == static_cast<double>(4.42999e-8));
     REQUIRE(r["y"].numAttributes() == 1); /* unitSI */
 
     r["z"].setUnitSI(1);
-    REQUIRE(r["z"].unitSI() == static_cast<double>(1));
+    REQUIRE(r["z"].resetDataset(dset).unitSI() == static_cast<double>(1));
     REQUIRE(r["z"].numAttributes() == 1); /* unitSI */
 }
 
@@ -505,13 +509,13 @@ TEST_CASE("mesh_constructor_test", "[core]")
     Mesh &m = o.iterations[42].meshes["E"];
 
     std::vector<double> pos{0};
-    REQUIRE(m["x"].unitSI() == 1);
+    REQUIRE(m["x"].resetDataset(globalDataset).unitSI() == 1);
     REQUIRE(m["x"].numAttributes() == 2); /* unitSI, position */
     REQUIRE(m["x"].position<double>() == pos);
-    REQUIRE(m["y"].unitSI() == 1);
+    REQUIRE(m["y"].resetDataset(globalDataset).unitSI() == 1);
     REQUIRE(m["y"].numAttributes() == 2); /* unitSI, position */
     REQUIRE(m["y"].position<double>() == pos);
-    REQUIRE(m["z"].unitSI() == 1);
+    REQUIRE(m["z"].resetDataset(globalDataset).unitSI() == 1);
     REQUIRE(m["z"].numAttributes() == 2); /* unitSI, position */
     REQUIRE(m["z"].position<double>() == pos);
     REQUIRE(m.geometry() == Mesh::Geometry::cartesian);
@@ -534,9 +538,9 @@ TEST_CASE("mesh_modification_test", "[core]")
     Series o = Series("./MyOutput_%T.json", Access::CREATE);
 
     Mesh &m = o.iterations[42].meshes["E"];
-    m["x"];
-    m["y"];
-    m["z"];
+    m["x"].resetDataset(globalDataset);
+    m["y"].resetDataset(globalDataset);
+    m["z"].resetDataset(globalDataset);
 
     m.setGeometry(Mesh::Geometry::spherical);
     REQUIRE(m.geometry() == Mesh::Geometry::spherical);

test/SerialIOTest.cpp

@@ -6647,11 +6647,19 @@ void unfinished_iteration_test(
          */
         it5.setAttribute("__openPMD_internal_fail", "asking for trouble");
         auto it10 = write.writeIterations()[10];
+        Dataset ds(Datatype::INT, {10});
         auto E_x = it10.meshes["E"]["x"];
         auto e_density = it10.meshes["e_density"][RecordComponent::SCALAR];
         auto electron_x = it10.particles["e"]["position"]["x"];
         auto electron_mass =
             it10.particles["e"]["mass"][RecordComponent::SCALAR];
+
+        RecordComponent *resetThese[] = {
+            &E_x, &e_density, &electron_x, &electron_mass};
+        for (RecordComponent *rc : resetThese)
+        {
+            rc->resetDataset(ds);
+        }
     }
     auto tryReading = [&config, file, encoding](
                           Access access,