Fix DCAT date validator on empty values

CHANGELOG.md

@@ -2,7 +2,8 @@
 
 ## [Unreleased](https://github.com/ckan/ckanext-dcat/compare/v2.0.0...HEAD)
 
-* Add support for hydra collection type PartialCollectionView
+* Fix DCAT date validator on empty values ([#297](https://github.com/ckan/ckanext-dcat/pull/297))
+* Add support for hydra collection type PartialCollectionView ([#299](https://github.com/ckan/ckanext-dcat/pull/299))
 
 ## [v2.0.0](https://github.com/ckan/ckanext-dcat/compare/v1.7.0...v2.0.0) - 2024-08-30
 
@@ -117,7 +118,7 @@
 
 ## [v1.1.0](https://github.com/ckan/ckanext-dcat/compare/v1.0.0...v1.1.0) - 2020-03-12
 
-* Python 3 support and new pytest based test suite ([#174](https://github.com/ckan/ckanext-dcat/pull/174))
+* Python 3 support and new pytest based test suite ([#174](https://github.com/ckan/ckanext-dcat/pull/174))painful
 * Fix `after_show - set_titles` in plugins.py ([#172](https://github.com/ckan/ckanext-dcat/pull/172))
 * Add support for DCT.rightsStatement in DCT.accessRights and DCT.rights ([#177](https://github.com/ckan/ckanext-dcat/pull/177))
 * Add support for additional vcard representations ([#178](https://github.com/ckan/ckanext-dcat/pull/178))

ckanext/dcat/tests/logic/test_validators.py

@@ -90,9 +90,27 @@ def test_dcat_date_invalid():
     invalid_values = [
         "2024+07",
         "not_a_date",
+        True
     ]
 
     for value in invalid_values:
         data = {key: value}
         with pytest.raises(Invalid):
             dcat_date(key, data, errors, {}), value
+
+
+def test_dcat_date_empty_values():
+
+    key = ("some_date",)
+    errors = {key: []}
+    valid_values = [
+        None,
+        False,
+        ""
+    ]
+
+    for value in valid_values:
+        data = {key: value}
+        dcat_date(key, data, errors, {}), value
+
+        assert data[key] is None

ckanext/dcat/validators.py

@@ -41,12 +41,19 @@ def is_date(value):
 def dcat_date(key, data, errors, context):
     value = data[key]
 
-    if isinstance(value, datetime.datetime):
+    if not value:
+        data[key] = None
         return
 
-    if is_year(value) or is_year_month(value) or is_date(value):
+    if isinstance(value, datetime.datetime):
         return
 
+    try:
+        if is_year(value) or is_year_month(value) or is_date(value):
+            return
+    except TypeError:
+        raise Invalid(_("Dates must be provided as strings or datetime objects"))
+
     try:
         parse_date(value)
     except ValueError: