fix bug when no field is provided

Author: phenobarbital

datamodel/abstract.py

@@ -170,9 +170,10 @@ def _initialize_fields(attrs, annotations, strict):
                         field,
                         Field(type=_type, required=False, default=None)
                     )
-                    alias = df.metadata.get("alias", None)
-                    if alias:
-                        aliases[alias] = field
+                    if df is not None and isinstance(df, Field):
+                        alias = df.metadata.get("alias", None)
+                        if alias:
+                            aliases[alias] = field
                     if not isinstance(df, Field):
                         df = Field(required=False, type=_type, default=df)
                     df.name = field

datamodel/fields.pyx

@@ -190,6 +190,13 @@ class Field(ff):
 
     @_recursive_repr
     def __repr__(self):
+        if self._alias is None:
+            return (
+                "Field("
+                f"column={self.name!r}, "
+                f"type={self.type!r}, "
+                f"default={self.default!r})"
+            )
         return (
             "Field("
             f"column={self.name!r}, "

datamodel/version.py

@@ -4,7 +4,7 @@
 __title__ = 'python-datamodel'
 __description__ = ('simple library based on python +3.8 to use Dataclass-syntax'
                    'for interacting with Data')
-__version__ = '0.8.6'
+__version__ = '0.8.7'
 __author__ = 'Jesus Lara'
 __author_email__ = '[email protected]'
 __license__ = 'BSD'