Fix get_uri for no default_prefix in schema

Author: dalito

linkml_runtime/utils/schemaview.py

@@ -1121,13 +1121,18 @@ def get_uri(self, element: Union[ElementName, Element], imports=True, expand=Fal
                     raise ValueError(f'Cannot find {e.from_schema} in schema_map')
             else:
                 schema = self.schema_map[self.in_schema(e.name)]
-            pfx = schema.default_prefix
             if use_element_type:
                 e_type = e.class_name.split("_",1)[0]  # for example "class_definition"
                 e_type_path = f"{e_type}/" 
             else:
                 e_type_path = ""
-            uri = f'{pfx}:{e_type_path}{e_name}'
+            pfx = schema.default_prefix
+            # To construct the uri we have to find out if the schema has a default_prefix 
+            # or if a pseudo "prefix" was derived from the schema id.
+            if pfx == sfx(str(schema.id)):  # no prefix defined in schema
+                uri = f'{pfx}{e_type_path}{e_name}'
+            else:
+                uri = f'{pfx}:{e_type_path}{e_name}'
         if expand:
             return self.expand_curie(uri)
         else:

tests/test_utils/test_schemaview.py

@@ -488,7 +488,6 @@ def test_imports(view):
     height = view.get_slot('height_in_m')
     assert height.unit.ucum_code == "m"
 
-
 def test_imports_from_schemaview(view):
     """view should by default dynamically include imports chain"""
     view2 = SchemaView(view.schema)
@@ -923,3 +922,17 @@ def test_type_and_slot_with_same_name():
     view.add_type(TypeDefinition(name="test", from_schema="https://example.org/imported#"))
 
     assert view.get_uri("test", imports=True) == "ex:test"
+
+
+def test_uris_without_default_prefix():
+    """
+    Test if uri is correct if no default_prefix is defined for the schema. Issue: linkml/linkml#2578
+    """
+    schema_definition = SchemaDefinition(id="https://example.org/test#", name="test_schema")
+
+    view = SchemaView(schema_definition)
+    view.add_class(ClassDefinition(name="TestClass", from_schema="https://example.org/another#"))
+    view.add_slot(SlotDefinition(name="test_slot", from_schema="https://example.org/another#"))
+
+    assert view.get_uri("TestClass", imports=True) == "https://example.org/test#TestClass"
+    assert view.get_uri("test_slot", imports=True) == "https://example.org/test#test_slot"