Enable nullable MarkdownColumns

[zzz-pokedex.git] / pokedex / db / markdown.py

diff --git a/pokedex/db/markdown.py b/pokedex/db/markdown.py
index 0bc6971..257c8de 100644 (file)
--- a/pokedex/db/markdown.py
+++ b/pokedex/db/markdown.py
@@ -56,44 +56,45 @@ class MarkdownString(object):
         """
         return self.source_text
 
+def _markdownify_effect_text(move, effect_text):
+    effect_text = effect_text.replace(
+        u'$effect_chance',
+        unicode(move.effect_chance),
+    )
 
-class _MoveEffects(object):
-    def __init__(self, effect_column, move):
-        self.effect_column = effect_column
-        self.move = move
-
-    def __contains__(self, lang):
-        return lang in self.move.move_effect.prose
+    return MarkdownString(effect_text)
 
-    def __getitem__(self, lang):
-        try:
-            effect_text = getattr(self.move.move_effect.prose[lang], self.effect_column)
-        except AttributeError:
-            return None
-        effect_text = effect_text.replace(
-            u'$effect_chance',
-            unicode(self.move.effect_chance),
-        )
-
-        return MarkdownString(effect_text)
-
-class MoveEffectsProperty(object):
+class MoveEffectProperty(object):
     """Property that wraps move effects.  Used like this:
 
-        MoveClass.effects = MoveEffectProperty('effect')
+        MoveClass.effect = MoveEffectProperty('effect')
 
-        some_move.effects[lang]            # returns a MarkdownString
-        some_move.effects[lang].as_html    # returns a chunk of HTML
+        some_move.effect            # returns a MarkdownString
+        some_move.effect.as_html    # returns a chunk of HTML
 
     This class also performs simple substitution on the effect, replacing
     `$effect_chance` with the move's actual effect chance.
+
+    Use `MoveEffectPropertyMap` for dict-like association proxies.
     """
 
     def __init__(self, effect_column):
         self.effect_column = effect_column
 
-    def __get__(self, move, move_class):
-        return _MoveEffects(self.effect_column, move)
+    def __get__(self, obj, cls):
+        prop = getattr(obj.move_effect, self.effect_column)
+        return _markdownify_effect_text(obj, prop)
+
+class MoveEffectPropertyMap(MoveEffectProperty):
+    """Similar to `MoveEffectProperty`, but works on dict-like association
+    proxies.
+    """
+    def __get__(self, obj, cls):
+        prop = getattr(obj.move_effect, self.effect_column)
+        newdict = dict(prop)
+        for key in newdict:
+            newdict[key] = _markdownify_effect_text(obj, newdict[key])
+        return newdict
 
 class MarkdownColumn(sqlalchemy.types.TypeDecorator):
     """Generic SQLAlchemy column type for Markdown text.
@@ -105,6 +106,9 @@ class MarkdownColumn(sqlalchemy.types.TypeDecorator):
     impl = sqlalchemy.types.Unicode
 
     def process_bind_param(self, value, dialect):
+        if value is None:
+            return None
+
         if not isinstance(value, basestring):
             # Can't assign, e.g., MarkdownString objects yet
             raise NotImplementedError
@@ -112,4 +116,7 @@ class MarkdownColumn(sqlalchemy.types.TypeDecorator):
         return unicode(value)
 
     def process_result_value(self, value, dialect):
+        if value is None:
+            return None
+
         return MarkdownString(value)