fix exporting CoordinateSystem to PROJ JSON with ID

2 files changed, 44 insertions, 5 deletions

diff --git a/src/iso19111/coordinatesystem.cpp b/src/iso19111/coordinatesystem.cpp
index 163f0f43..fc4b7492 100644
--- a/src/iso19111/coordinatesystem.cpp
+++ b/src/iso19111/coordinatesystem.cpp
@@ -581,11 +581,13 @@ void CoordinateSystem::_exportToJSON(
     writer.Add(getWKT2Type(true));
 
     writer.AddObjKey("axis");
-    auto axisContext(writer.MakeArrayContext(false));
-    const auto &l_axisList = axisList();
-    for (auto &axis : l_axisList) {
-        formatter->setOmitTypeInImmediateChild();
-        axis->_exportToJSON(formatter);
+    {
+        auto axisContext(writer.MakeArrayContext(false));
+        const auto &l_axisList = axisList();
+        for (auto &axis : l_axisList) {
+            formatter->setOmitTypeInImmediateChild();
+            axis->_exportToJSON(formatter);
+        }
     }
 
     if (formatter->outputId()) {
diff --git a/test/unit/test_io.cpp b/test/unit/test_io.cpp
index 4242a15c..d165157d 100644
--- a/test/unit/test_io.cpp
+++ b/test/unit/test_io.cpp
@@ -11915,3 +11915,40 @@ TEST(json_import, multiple_ids) {
     EXPECT_EQ(ellps->exportToJSON(&(JSONFormatter::create()->setSchema("foo"))),
               json);
 }
+
+// ---------------------------------------------------------------------------
+
+TEST(json_export, coordinate_system_id) {
+    auto json = "{\n"
+                "  \"$schema\": \"foo\",\n"
+                "  \"type\": \"CoordinateSystem\",\n"
+                "  \"subtype\": \"ellipsoidal\",\n"
+                "  \"axis\": [\n"
+                "    {\n"
+                "      \"name\": \"Geodetic latitude\",\n"
+                "      \"abbreviation\": \"Lat\",\n"
+                "      \"direction\": \"north\",\n"
+                "      \"unit\": \"degree\"\n"
+                "    },\n"
+                "    {\n"
+                "      \"name\": \"Geodetic longitude\",\n"
+                "      \"abbreviation\": \"Lon\",\n"
+                "      \"direction\": \"east\",\n"
+                "      \"unit\": \"degree\"\n"
+                "    }\n"
+                "  ],\n"
+                "  \"id\": {\n"
+                "    \"authority\": \"EPSG\",\n"
+                "    \"code\": 6422\n"
+                "  }\n"
+                "}";
+
+    auto dbContext = DatabaseContext::create();
+    auto obj = createFromUserInput("EPSG:4326", dbContext);
+    auto crs = nn_dynamic_pointer_cast<GeographicCRS>(obj);
+    ASSERT_TRUE(crs != nullptr);
+    auto cs = crs->coordinateSystem();
+    ASSERT_TRUE(cs != nullptr);
+    EXPECT_EQ(cs->exportToJSON(&(JSONFormatter::create()->setSchema("foo"))),
+              json);
+}