Add shortcut properties to Taxon for ancestors of common ranks

HISTORY.md

@@ -10,6 +10,8 @@
 * Add `root_id` filter to `taxon.make_tree()` to explicitly set the root taxon instead of determining it automatically
 * Fix `taxon.make_tree()` rank filtering to allow skipping any number of rank levels
 * `taxon.make_tree()` now returns copies of original taxon objects instead of modifying them in-place
+* Add shortcut properties to `Taxon` for ancestors of common ranks:
+  `Taxon.kingdom`, `phylum`, `class_` (note the `_`; 'class' is a reserved keyword), `order`, `family`, `genus`
 * Update `Observation.taxon.ancestors` based on identification data, if available
 
 ### Rate limits, timeouts, and error handling

pyinaturalist/models/taxon.py

@@ -186,6 +186,33 @@ def from_sorted_json_list(cls, value: JsonResponse, **kwargs) -> List['Taxon']:
         taxa.sort(key=_sort_rank_name)
         return taxa
 
+    @property
+    def kingdom(self) -> Optional['Taxon']:
+        return self._get_ancestor_by_rank('kingdom')
+
+    @property
+    def phylum(self) -> Optional['Taxon']:
+        return self._get_ancestor_by_rank('phylum')
+
+    @property
+    def class_(self) -> Optional['Taxon']:
+        return self._get_ancestor_by_rank('class')
+
+    @property
+    def order(self) -> Optional['Taxon']:
+        return self._get_ancestor_by_rank('order')
+
+    @property
+    def family(self) -> Optional['Taxon']:
+        return self._get_ancestor_by_rank('family')
+
+    @property
+    def genus(self) -> Optional['Taxon']:
+        return self._get_ancestor_by_rank('genus')
+
+    def _get_ancestor_by_rank(self, rank: str) -> Optional['Taxon']:
+        return next((t for t in self.ancestors if t.rank == rank), None)
+
     @property
     def child_ids(self) -> List[int]:
         """Taxon IDs of direct children, sorted by rank then name"""

test/test_models.py

@@ -938,6 +938,16 @@ def test_taxon__ancestor_ids_from_ancestor_objs():
     assert taxon.ancestor_ids == ids
 
 
+def test_taxon_ancestor_shortcuts():
+    taxon = Taxon.from_json(j_taxon_1)
+    assert taxon.kingdom.id == 1 and taxon.kingdom.name == 'Animalia'
+    assert taxon.phylum.id == 47120 and taxon.phylum.name == 'Arthropoda'
+    assert taxon.class_.id == 47158 and taxon.class_.name == 'Insecta'
+    assert taxon.order.id == 47208 and taxon.order.name == 'Coleoptera'
+    assert taxon.family.id == 53849 and taxon.family.name == 'Silphidae'
+    assert taxon.genus.id == 53850 and taxon.genus.name == 'Nicrophorus'
+
+
 def test_taxon__all_names():
     taxon = Taxon.from_json(j_taxon_8_all_names)
     assert taxon.names[1] == {