fix bug where overrides are applied after templates are processed

dnd_item/types.py

@@ -156,7 +156,7 @@ class Item(AttributeMap):
           ?     length=10,
           ?     properties=dict(
           ?         'broken'=dict(
-          ?             description="The end of this {length}ft. pole has been snapped off.",
+          ?             description="The end of this 10ft. pole has been snapped off.",
           ?             override_length=7
           ?         ),
           ?     )
@@ -199,10 +199,6 @@ class Item(AttributeMap):
         converted to Item objects; everything else is passed as-is.
         """
 
-        # delay processing the 'properties' attribute until after the other
-        # attributes, because they may contain references to those attributes.
-        properties = attrs.pop("properties", None)
-
         attributes = dict()
 
         # recursively locate and populate template strings
@@ -233,19 +229,25 @@ class Item(AttributeMap):
             # Any type other than dict, list, and string is returned unaltered.
             return obj
 
+        properties = attrs.pop("properties", {})
+
+        # apply property overrides overrides before anything else
+        for prop in properties.values():
+            overrides = [k for k in prop.keys() if k.startswith("override_")]
+            for o in overrides:
+                if prop[o]:
+                    attrs[o.replace("override_", "")] = prop[o]
+
         # step through the supplied attributes and format each member.
         for k, v in sorted(attrs.items(), key=lambda i: '{' in f"{i[0]}{i[1]}"):
             if type(v) is dict:
                 attributes[k] = AttributeMap.from_dict(_format(v))
             else:
                 attributes[k] = _format(v)
+
+        # process properties now that we have preprocessed everything else
         if properties:
             attributes["properties"] = AttributeMap.from_dict(_format(properties))
-            for prop in attributes["properties"].values():
-                overrides = [k for k in prop.attributes.keys() if k.startswith("override_")]
-                for o in overrides:
-                    if prop.attributes[o]:
-                        attributes[o.replace("override_", "")] = prop.attributes[o]
 
         # store the item name as the _name attribute; it is accessable directly, or
         # via the name property. This makes overriding the name convenient for subclassers,

tests/test_types.py

@@ -1,6 +1,28 @@
 from dnd_item import types
 
 
+def test_AttributeMap():
+    assert types.AttributeMap(attributes={'foo': True, 'bar': False}).foo is True
+
+
+def test_AttributeMap_nested():
+    nested_dict = {'foo': {'bar': {'baz': True}, 'boz': False}}
+    amap = types.AttributeMap.from_dict(nested_dict)
+    assert amap.foo.bar.baz is True
+    assert amap.foo.boz is False
+
+
+def test_AttributeMap_list():
+    amap = types.AttributeMap(attributes={'foo': True, 'bar': False})
+    assert list(amap.attributes.keys()) == ['foo', 'bar']
+
+
+def test_AttributeMap_mapping():
+    amap = types.AttributeMap(attributes={'foo': True, 'bar': False})
+    assert 'foo' in amap
+    assert '{foo}, {bar}'.format(**amap) == 'True, False'
+
+
 def test_Item_attributes():
     assert types.Item.from_dict(dict(
         name='{length}ft. Pole',
@@ -10,7 +32,7 @@ def test_Item_attributes():
     )).name == '10ft. Pole'
 
 
-def test_item_nested_attributes():
+def test_Item_nested_attributes():
     assert types.Item.from_dict(dict(
         name='{length}ft. Pole',
         length=10,
@@ -23,3 +45,19 @@ def test_item_nested_attributes():
             owner='Jules Ultardottir',
         )
     )).description == 'Engraved. "Property of Jules Ultardottir!"'
+
+
+def test_Item_overrides():
+    attrs = dict(
+        name='{length}ft. Pole',
+        length=10,
+        properties=dict(
+            broken=dict(
+                description="The end of this 10ft. pole has been snapped off.",
+                override_length=7
+            ),
+        )
+    )
+    ten_foot_pole = types.Item.from_dict(attrs)
+    assert ten_foot_pole.name == '7ft. Pole'
+    assert ten_foot_pole.description == 'Broken. The end of this 10ft. pole has been snapped off.'