reaction stat, author stat

resolvers/zine/_common.py

@@ -0,0 +1,31 @@
+from sqlalchemy import func, case
+from sqlalchemy.orm import aliased
+from orm.reaction import Reaction, ReactionKind
+
+
+def add_common_stat_columns(q):
+    aliased_reaction = aliased(Reaction)
+
+    q = q.outerjoin(aliased_reaction).add_columns(
+        func.sum(
+            aliased_reaction.id
+        ).label('reacted_stat'),
+        func.sum(
+            case(
+                (aliased_reaction.body.is_not(None), 1),
+                else_=0
+            )
+        ).label('commented_stat'),
+        func.sum(case(
+            (aliased_reaction.kind == ReactionKind.AGREE, 1),
+            (aliased_reaction.kind == ReactionKind.DISAGREE, -1),
+            (aliased_reaction.kind == ReactionKind.PROOF, 1),
+            (aliased_reaction.kind == ReactionKind.DISPROOF, -1),
+            (aliased_reaction.kind == ReactionKind.ACCEPT, 1),
+            (aliased_reaction.kind == ReactionKind.REJECT, -1),
+            (aliased_reaction.kind == ReactionKind.LIKE, 1),
+            (aliased_reaction.kind == ReactionKind.DISLIKE, -1),
+            else_=0)
+        ).label('rating_stat'))
+
+    return q