Add crudkit!

crudkit/serialize.py

@@ -0,0 +1,22 @@
+def serialize(obj, *, fields=None, expand=None):
+    expand = set(expand or [])
+    fields = set(fields or [])
+    out = {}
+    # base columns
+    for col in obj.__table__.columns:
+        name = col.key
+        if fields and name not in fields:
+            continue
+        out[name] = getattr(obj, name)
+    # expansions
+    for rel in obj.__mapper__.relationships:
+        if rel.key not in expand:
+            continue
+        val = getattr(obj, rel.key)
+        if val is None:
+            out[rel.key] = None
+        elif rel.uselist:
+            out[rel.key] = [serialize(child) for child in val]
+        else:
+            out[rel.key] = serialize(val)
+    return out