fix(metadata): fix count of distinct taxon in the acquisition framewo…

…rk page (#3290)

* fix(metadata): fix count of distinct taxon in the af page
* fix(test, metadata): fix af taxon stats test

backend/geonature/core/gn_meta/routes.py

@@ -863,7 +863,9 @@ def get_acquisition_framework_stats(id_acquisition_framework):
     nb_datasets = len(dataset_ids)
 
     nb_taxons = db.session.execute(
-        select(func.count(Synthese.cd_nom)).where(Synthese.id_dataset.in_(dataset_ids)).distinct()
+        select(func.count(func.distinct(Synthese.cd_nom))).where(
+            Synthese.id_dataset.in_(dataset_ids)
+        )
     ).scalar_one()
 
     nb_observations = db.session.execute(

backend/geonature/tests/fixtures.py

@@ -643,6 +643,18 @@ def synthese_data(app, users, datasets, source, sources_modules):
                 altitude_2,
                 altitude_3,
             ),
+            (
+                "obs4",
+                212,
+                point3,
+                datasets["own_dataset"],
+                "obs3",
+                sources_modules[1],
+                date_2,
+                date_3,
+                altitude_2,
+                altitude_3,
+            ),
             (
                 "p1_af1",
                 713776,

backend/geonature/tests/test_gn_meta.py

@@ -540,7 +540,7 @@ def test_get_acquisition_framework_stats(
         # For each entry, take the max between count_min and count_max. And if
         # not provided: count_min and/or count_max is 1. Since one entry in
         # synthese is at least 1 taxon
-        assert data["nb_taxons"] == sum(max(s.count_min or 1, s.count_max or 1) for s in obs)
+        assert data["nb_taxons"] == len(set([s.cd_nom for s in obs]))
 
     def test_get_acquisition_framework_bbox(self, users, acquisition_frameworks, synthese_data):
         # this AF contains at least 2 obs at different locations

backend/geonature/tests/test_synthese.py

@@ -395,7 +395,7 @@ def test_get_observations_for_web_filter_id_source(self, users, synthese_data, s
 
     @pytest.mark.parametrize(
         "module_label_to_filter,expected_length",
-        [(["MODULE_TEST_1"], 2), (["MODULE_TEST_2"], 4), (["MODULE_TEST_1", "MODULE_TEST_2"], 6)],
+        [(["MODULE_TEST_1"], 2), (["MODULE_TEST_2"], 5), (["MODULE_TEST_1", "MODULE_TEST_2"], 7)],
     )
     def test_get_observations_for_web_filter_source_by_id_module(
         self,