fixed ModelMetaclass.__new__() failing to correctly inferred that type is Group when default value is of type Group

Author: alixdamman

larray/core/checked.py

@@ -8,6 +8,7 @@
 
 from larray.core.metadata import Metadata
 from larray.core.axis import AxisCollection
+from larray.core.group import Group
 from larray.core.array import Array, full
 from larray.core.session import Session
 
@@ -173,7 +174,10 @@ def __new__(mcs, name, bases, namespace, **kwargs):
                     if (var_name not in annotations and not var_name.startswith('_') and
                             not isinstance(value, untouched_types) and var_name not in class_vars):
                         validate_field_name(bases, var_name)
-                        inferred = ModelField.infer(name=var_name, value=value, annotation=annotations.get(var_name),
+                        # the method ModelField.infer() fails to infer the type of Group objects
+                        # (which are interpreted as ndarray objects)
+                        annotation = type(value) if isinstance(value, Group) else annotations.get(var_name)
+                        inferred = ModelField.infer(name=var_name, value=value, annotation=annotation,
                                                     class_validators=validators.get(var_name, []), config=config)
                         if var_name in fields and inferred.type_ != fields[var_name].type_:
                             raise TypeError(f'The type of {name}.{var_name} differs from the new default value; '