#987 fixed error message to include data about error

spinta/exceptions.py

@@ -1001,4 +1001,4 @@ class InvalidClientFileFormat(UserError):
 
 
 class MissingRefModel(UserError):
-    template = "Property of type `ref` or `backref` should have a model in the `ref` column"
+    template = 'Property "{property_name}" of type "{property_type}" in the model "{model_name}" should have a model name in the `ref` column, to which it refers.'

spinta/types/ref/link.py

@@ -15,7 +15,7 @@ def link(context: Context, dtype: Ref) -> None:
     # XXX: https://github.com/atviriduomenys/spinta/issues/44
     rmodel: str = dtype.model
     if rmodel is None:
-        raise MissingRefModel
+        raise MissingRefModel(model_name=dtype.prop.model.basename, property_name=dtype.prop.name, property_type=dtype.prop.dtype.name)
     if rmodel == dtype.prop.model.name:
         # Self reference.
         dtype.model = dtype.prop.model

tests/types/test_link.py

@@ -23,4 +23,9 @@ def test_raises_missing_ref_model(manifest_type, tmp_path, rc):
 
     with pytest.raises(MissingRefModel) as e:
         load_manifest(rc, manifest=manifest, manifest_type=manifest_type, tmp_path=tmp_path)
-    assert str(e.value) == 'Property of type `ref` or `backref` should have a model in the `ref` column\n'
+    assert str(e.value) == '''Property "country" of type "ref" in the model "City" should have a model name in the `ref` column, to which it refers.
+  Context:
+    model_name: City
+    property_name: country
+    property_type: ref
+'''