constitution · epochs · watch · epoch 3

comparison

c_f10e7b043e68 (tommy-mor) vs c_939729b4d9a6 (tommy-mor)

download prompt · raw event · cmp_26b0d6f30a25b8

council reasoning

~anthropic/claude-sonnet-latest · winner A · 6:4 · permalink

Side A shows a genuine architectural improvement: it removes the ad-hoc, hardcoded per-domain combinator engine (engine.rs, with special-cased reddit/youtube logic) in favor of a documented generic graph/DFA approach with a fallback for unknown sites, generalizing URL canonicalization beyond two hardcoded domains. Side B bundles plumbing (new deps, typed form holes, a vote CTA link, CSS/JS for a slider) but its core new logic (vote.rs, pair.rs) isn't visible in the diff, making it hard to verify the actual 'fix' beyond UI wiring and dependency additions.

~x-ai/grok-latest · winner A · 2:1 · permalink

A replaces the ad-hoc ParsedUrl combinator engine and per-host normalize paths with a graph-based canonicalization API (registry rewired to graph/parse, docs and module layout updated)—core lasting design for ItemId identity. B adds real vote UX wiring (typed $form:i32 holes, next redirect, route/CSS/JS), but it is mostly product-surface and dependency churn versus A’s deeper domain redesign.

openai/gpt-chat-latest · winner B · 4:1 · permalink

Side B introduces concrete functionality: typed form substitution for `{"$form:i32": ...}` with tests, support for a `next` redirect after recording votes, routing and UI plumbing for a voting flow, and corresponding client-side behavior. Side A mainly replaces the URL canonicalization implementation with references to new `graph`/`parse` modules while deleting the old engine from the shown patch, making it primarily a structural refactor in the visible changes rather than a clearly demonstrated functional improvement.

sides

A — c_f10e7b043e68 (tommy-mor)

message

[7bb7145d] url stuff

diff preview

diff --git a/AGENTS.md b/AGENTS.md
index e60b9ba6012593361ef10e8fdd9439cd9932e09b..babb889d6fbfb1fa7176c9e6b7544ae17b61dd2e 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -58,4 +58,4 @@ Use **tmux** for `cargo run --package sorter2-server` (dev server). Rebuild afte
 
 - First `cargo test` / `cargo build --release` is slow; Clojure smoke test always does a release build.
 - `legacy/` and `ideas/` are not part of the workspace build.
-- **ItemId** for web URLs is a canonical full URL (`https://reddit.com/r/rust`). Rules live in [`server/src/url_rules/`](server/src/url_rules/) (composable Rust, not a config DSL). After changing canonicalization rules, rebuild the projection: `cargo run --package sorter2-server -- replay-index`.
+- **ItemId** for web URLs is a canonical full URL (`https://reddit.com/r/rust`). Rules live in [`server/src/url_rules/graph.rs`](server/src/url_rules/graph.rs): a semantic graph (DFA on host + path, query params in `Context`) with a generic internet fallback for unknown sites. After changing rules, rebuild the projection: `cargo run --package sorter2-server -- replay-index`.
diff --git a/server/src/url_rules/engine.rs b/server/src/url_rules/engine.rs
deleted file mode 100644
index e29b6b48c08deb7bffe031b1e542b1e25a7bef15..0000000000000000000000000000000000000000
--- a/server/src/url_rules/engine.rs
+++ /dev/null
@@ -1,187 +0,0 @@
-//! Composable URL normalization primitives.
-
-use std::collections::HashMap;
-
-use url::Url;
-
-/// Mutable URL view used by rule combinators before serializing to a canonical string.
-#[derive(Debug, Clone)]
-pub struct ParsedUrl {
-    pub scheme: String,
-    pub host: String,
-    pub path_segments: Vec<String>,
-    pub query: HashMap<String, String>,
-    pub fragment: Option<String>,
-}
-
-impl ParsedUrl {
-    pub fn parse(raw: &str) -> Option<Self> {
-        let trimmed = raw.trim();
-        if trimmed.is_empty() {
-            return None;
-        }
-
-        let with_scheme = if trimmed.contains("://") {
-            trimmed.to_string()
-        } else if trimmed.starts_with("r/") || trimmed.starts_with("/r/") {
-            let rest = trimmed.trim_start_matches('/').trim_start_matches("r/");
-            format!("https://reddit.com/r/{rest}")
-        } else if trimmed.contains('.') && !trimmed.starts_with('/') {
-            format!("https://{trimmed}")
-        } else {
-            trimmed.to_string()
-        };
-
-        let url = Url::parse(&with_scheme).ok()?;
-        let host = url.host_str()?.to_string();
-        let path_segments: Vec<String> = url
-            .path_segments()
-            .map(|segs| segs.filter(|s| !s.is_empty()).map(str::to_string).collect())
-            .unwrap_or_default();
-
-        let mut query = HashMap::new();
-        for (k, v) in url.query_pairs() {
-            query.insert(k.into_owned(), v.into_owned());
-        }
-
-        Some(Self {
-            scheme: url.scheme().to_string(),
-            path_segments,
-            query,
-            fragment: url.fragment().map(str::to_string),
-            host,
-        })
-    }
-
-    pub fn with_path_segments(&self, segments: &[String]) -> Self {
-        let mut u = self.clone();
-        u.path_segments = segments.to_vec();
-        u
-    }
-
-    pub fn to_url(&self) -> Option<Url> {
-        let mut url = if self.path_segments.is_empty() {
-            Url::parse(&format!("{}://{}", self.scheme, self.host)).ok()?
-        } else {
-            let path = format!("/{}", self.path_segments.join("/"));
-            Url::parse(&format!("{}://{}{}", self.scheme, self.host, path)).ok()?
-        };
-        if !self.query.is_empty() {
-            let mut pairs: Vec<_> = self.query.iter().collect();
-            pairs.sort_by(|a, b| a.0.cmp(b.0));
-            url.query_pairs_mut().clear();
-            for (k, v) in pairs {
-                url.query_pairs_mut().append_pair(k, v);
-            }
-        }
-        if let Some(ref frag) = self.fragment {
-            url.set_fragment(Some(frag));
-        }
-        Some(url)
-    }
-
-    pub fn canonical_string(&self) -> Option<String> {
-        let url = self.to_url()?;
-        let mut s = url.to_string();
-        if self.path_segments.is_empty() {
-            s = s.trim_end_matches('/').to_string();
-        }
-        Some(s)
-    }
-}
-
-pub fn force_https(u: &mut ParsedUrl) {
-    if u.scheme == "http" {
-        u.scheme = "https".to_string();
-    }
-}
-
-pub fn drop_fragment(u: &mut ParsedUrl) {
-    u.fragment = None;
-}
-
-pub fn strip_www(u: &mut ParsedUrl) {
-    if u.host.starts_with("www.") {
-        u.host = u.host[4..].to_string();
-    }
-}
-
-pub fn lowercase_host(u: &mut ParsedUrl) {
-    u.host = u.host.to_ascii_lowercase();
-}
-
-pub fn lowercase_path(u: &mut ParsedUrl) {
-    for seg in &mut u.path_segments {
-        *seg = seg.to_ascii_lowercase();
-    }
-}
-
-pub fn clear_query(u: &mut ParsedUrl) {
-    u.query.clear();
-}
-
-pub fn keep_only_query(u: &mut ParsedUrl, keys: &[&str]) {
-    u.query
-        .retain(|k, _| keys.iter().any(|want| want == &k.as_str()));
-}
-
-pub fn strip_tracking_params(u: &mut ParsedUrl) {
-    u.query.retain(|k, _| {
-        let lower = k.to_ascii_lowercase();
-        !(lower.starts_with("utm_")
-            || matches!(
-                lower.as_str(),
-                "fbclid" | "gclid" | "ref" | "ref_src" | "ref_source" | "mc_cid" | "mc_eid"
-            ))
-    });
-}
-
-pub fn truncate_after_segment(u: &mut ParsedUrl, name: &str, keep: usize) {
-    if let Some(i) = u.path_segments.iter().position(|s| s == name) {
-        let end = (i + 1 + keep).min(u.path_segments.len());
-        u.path_segments.truncate(end);
-    }
-}
-
-pub fn drop_listing_suffix(u: &mut ParsedUrl, suffixes: &[&str]) {
-    if u.path_segments.len() >= 3 && u.path_segments.first().map(String::as_str) == Some("r") {
-        if let Some(last) = u.path_segments.last() {
-            if suffixes.iter().any(|s| *s == last.as_str()) {
-                u.path_segments.pop();
-            }
-        }
-    }
-}
-
-pub fn normalize_reddit_host(u: &mut ParsedUrl) {
-    if matches!(
-        u.host.as_str(),
-        "old.reddit.com" | "new.reddit.com" | "www.reddit.com"
-    ) {
-        u.host = "reddit.com".to_string();
-    }
-}
-
-pub fn rewrite_youtu_be(u: &mut ParsedUrl) {
-    if u.host == "youtu.be" && u.path_segments.len() == 1 {
-        let id = u.path_segments[0].clone();
-        u.host = "youtube.com".to_string();
-        u.path_segments = vec!["watch".to_string()];
-        u.query.insert("v".to_string(), id);
-    }
-}
-
-pub fn rewrite_youtube_shorts(u: &mut ParsedUrl) {
-    if u.host == "youtube.com" && u.path_segments.first().map(String::as_str) == Some("shorts") {
-        if let Some(id) = u.path_segments.get(1).cloned() {
-            u.path_segments = vec!["watch".to_string()];
-            u.query.insert("v".to_string(), id);
-        }
-    }
-}
-
-pub fn normalize_youtube_host(u: &mut ParsedUrl) {
-    if matches!(u.host.as_str(), "m.youtube.com" | "www.youtube.com") {
-        u.host = "youtube.com".to_string();
-    }
-}
diff --git a/server/src/url_rules/mod.rs b/server/src/url_rules/mod.rs
index 03d53bd3e82d704a01ba3fd8dd02b7d31422c0de..9e1445346ce77a49dd6a7e7713bf9c57aef353cc 100644
--- a/server/src/url_rules/mod.rs
+++ b/server/src/url_rules/mod.rs
@@ -1,8 +1,12 @@
-//! URL canonicalization and hierarchy rules for [`crate::path_types::ItemId`].
+//! URL canonicalization and hierarchy via a semantic graph (DFA + generic fallback).
 
-mod engine;
+mod graph;
+mod parse;
 mod registry;
 
+#[cfg(test)]
+mod registry_tests;
+
 pub use registry::{
     canonicalize_raw, looks_like_url, navigable_breadcrumbs, parent_url, resolve_id, CanonicalResult,
 };
diff --git a/server/src/url_rules/registry.rs b/server/src/url_rules/registry.rs
index 14514e9af8385fb2b9b2f35eb9ee14d453d4b97c..8e6c012ea1fc74b864307bdacdf5a0f5db5259fc 100644
--- a/server/src/url_rules/registry.rs
+++ b/server/src/url_rules/registry.rs
@@ -1,12 +1,7 @@
-//! Per-domain canonicalization and hierarchy rules.
+//! Public API: canonical identity and hierarchy via the URL graph.
 
-use std::collections::HashSet;
-
-use super::engine::{
-    clear_query, drop_fragment, drop_listing_suffix, force_https, keep_only_query, lowercase_host,
-    lowercase_path, normalize_reddit_host, normalize_youtube_host, rewrite_youtu_be,
-    rewrite_youtube_shorts, strip_tracking_params, strip_www, truncate_after_segment, ParsedUrl,
-};
+use super::graph::graph;
+use super::parse::UrlParts;
 
 /// Result of canonicalizing a raw URL string.
 #[derive(Debug, Clone, PartialEq, Eq)]
@@ -16,71 +11,16 @@ pub struct CanonicalResult {
     pub alias_of: Option<String>,
 }
 
-fn apply_global(u: &mut ParsedUrl) {
-    force_https(u);
-    drop_fragment(u);
-    strip_www(u);
-    lowercase_host(u);
-    strip_tracking_params(u);
-}
-
-fn normalize_reddit(u: &mut ParsedUrl) {
-    normalize_reddit_host(u);
-    lowercase_path(u);
-    truncate_after_segment(u, "comments", 1);
-    drop_listing_suffix(u, &["hot", "top", "new", "rising", "controversial"]);
-    clear_query(u);
-}
-
-fn normalize_youtube(u: &mut ParsedUrl) {
-    rewrite_youtu_be(u);
-    normalize_youtube_host(u);
-    rewrite_youtube_shorts(u);
-    keep_only_query(u, &["v", "list"]);
-}
-
-fn normalize_default(_u: &mut ParsedUrl) {
-    // Global rules only.
-}
-
-fn domain_key(host: &str) -> &'static str {
-    if host == "reddit.com" || host.ends_with(".reddit.com") {
-        "reddit.com"
-    } else if host == "youtube.com" || host == "youtu.be" {
-        "youtube.com"
-    } else {
-        "default"
-    }
-}
-
-fn normalize_for_host(u: &mut ParsedUrl) {
-    apply_global(u);
-    match domain_key(&u.host) {
-        "reddit.com" => normalize_reddit(u),
-        "youtube.com" => normalize_youtube(u),
-        _ => normalize_default(u),
-    }
-}
-
-/// Structural path segments that must not become standalone tree nodes when more path follows.
-fn structural_trailing(host: &str) -> &'static [&'static str] {
-    match domain_key(host) {
-        "reddit.com" => &["comments"],
-        _ => &[],
-    }
-}
-
 /// Canonicalize a raw URL. Returns `None` if the input is not URL-like.
 pub fn canonicalize_raw(raw: &str) -> Option<CanonicalResult> {
     let trimmed = raw.trim();
     if trimmed.is_empty() {
         return None;
     }
-    let mut u = ParsedUrl::parse(trimmed)?;
-    let input_snapshot = u.canonical_string()?;
-    normalize_for_host(&mut u);
-    let canonical = u.canonical_string()?;
-    let alias_of = if input_snapshot != canonical {
+    let parts = UrlParts::parse(trimmed)?;
+    let g = graph();
+    let canonical = g.resolve_canonical(&parts)?;
+    let alias_of = if trimmed != canonical {
         Some(trimmed.to_string())
     } else {
         None
@@ -98,35 +38,14 @@ pub fn resolve_id(raw: &str) -> Option<String> {
 
 /// Navigable ancestor URLs from domain root up to and including `canonical` (full URLs).
 pub fn navigable_breadcrumbs(canonical: &str) -> Vec<String> {
-    let Some(u) = ParsedUrl::parse(canonical) else {
-        return vec![canonical.to_string()];
+    let parts = match UrlParts::parse(canonical) {
+        Some(p) => p,
+        None => return vec![canonical.to_string()],
     };
-    let structural: HashSet<&str> = structural_trailing(&u.host).iter().copied().collect();
-    let n = u.path_segments.len();
-    let mut out = Vec::new();
-
-    // Domain root (no path segments).
-    if let Some(base) = u.with_path_segments(&[]).canonical_string() {
-        out.push(base);
-    }
-
-    for i in 0..n {
-        let segs: Vec<String> = u.path_segments[..=i].to_vec();
-        let is_last = i == n - 1;
-        let seg = u.path_segments[i].as_str();
-        if structural.contains(seg) && !is_last {
-            continue;
-        }
-        if let Some(url) = u.with_path_segments(&segs).canonical_string() {
-            if out.last() != Some(&url) {
- 

… preview truncated; 3,144 characters omitted

download full diff A

B — c_939729b4d9a6 (tommy-mor)

message

[7964b28f] fix

diff preview

diff --git a/Cargo.lock b/Cargo.lock
index 8c43fb75c472b102e6e1d3b837dce3355be898f2..e55d87f32ab32064686431c7082ef8c9ca872d63 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -923,6 +923,15 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "439ee305def115ba05938db6eb1644ff94165c5ab5e9420d1c1bcedbba909391"
 
+[[package]]
+name = "ppv-lite86"
+version = "0.2.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85eae3c4ed2f50dcfe72643da4befc30deadb458a9b590d720cde2f2b1e97da9"
+dependencies = [
+ "zerocopy",
+]
+
 [[package]]
 name = "prettyplease"
 version = "0.2.37"
@@ -980,6 +989,36 @@ version = "6.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f8dcc9c7d52a811697d2151c701e0d08956f92b0e24136cf4cf27b57a6a0d9bf"
 
+[[package]]
+name = "rand"
+version = "0.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ca0ecfa931c29007047d1bc58e623ab12e5590e8c7cc53200d5202b69266d8a"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom 0.2.17",
+]
+
 [[package]]
 name = "regex-automata"
 version = "0.4.14"
@@ -1270,6 +1309,7 @@ dependencies = [
  "dotenvy",
  "futures-util",
  "maud",
+ "rand",
  "reqwest",
  "serde",
  "serde_json",
@@ -1280,6 +1320,7 @@ dependencies = [
  "tower-http 0.5.2",
  "tracing",
  "tracing-subscriber",
+ "urlencoding",
 ]
 
 [[package]]
@@ -1656,6 +1697,12 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "urlencoding"
+version = "2.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "daf8dba3b7eb870caf1ddeed7bc9d2a049f3cfdfae7cb521b087cc33ae4c49da"
+
 [[package]]
 name = "utf8_iter"
 version = "1.0.4"
@@ -2052,6 +2099,26 @@ dependencies = [
  "synstructure",
 ]
 
+[[package]]
+name = "zerocopy"
+version = "0.8.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b065d4f0e55f82fae73202e189638116a87c55ab6b8e6c2721e13dd9d854ad1"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.8.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b631b19d36a892ab55420c92dbc83ccd79274f25be714855d3074aa71cab639"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "zerofrom"
 version = "0.1.8"
diff --git a/server/Cargo.toml b/server/Cargo.toml
index c940acb687fb141d21760a3d6656172013cf6f41..6fb7bf52fa58f46f5e8fb0f7fd395247b57506d7 100644
--- a/server/Cargo.toml
+++ b/server/Cargo.toml
@@ -20,6 +20,8 @@ reqwest = { version = "0.12", features = ["json"] }
 dotenvy = "0.15"
 async-stream = "0.3"
 futures-util = { version = "0.3", default-features = false, features = ["std"] }
+rand = "0.8"
+urlencoding = "2"
 
 [dev-dependencies]
 reqwest = { version = "0.12", features = ["json"] }
diff --git a/server/src/api/ui_html.rs b/server/src/api/ui_html.rs
index e649a7d192feade465e19ce6187a829f6ec74372..06001212820101e0cc953d3687dea64f85e60787 100644
--- a/server/src/api/ui_html.rs
+++ b/server/src/api/ui_html.rs
@@ -47,6 +47,7 @@ pub async fn post_ui_html(
             ratio_left,
             ratio_right,
             scope,
+            next,
         } => {
             let parent = parent_from_scope(&scope);
             if let Err(e) = state
@@ -56,9 +57,19 @@ pub async fn post_ui_html(
                 return ui_js_warn(&e).into_response();
             }
             let tree = state.tree.read().await;
+            if !next.trim().is_empty() {
+                drop(tree);
+                return JsBuilder::new()
+                    .raw(&format!(
+                        "window.location.href={};",
+                        js_string_literal(next.trim())
+                    ))
+                    .into_response();
+            }
             let empty = crate::reducer::NodeState::default();
             let node = tree.get(&parent).unwrap_or(&empty);
             let panel = ranking_panel(&parent, node, &tree);
+            drop(tree);
             JsBuilder::new()
                 .morph_selector("#ranking-panel", panel)
                 .into_response()
@@ -126,6 +137,7 @@ mod tests {
                 ratio_left: 3,
                 ratio_right: 1,
                 scope: String::new(),
+                next: String::new(),
             }
         );
     }
diff --git a/server/src/form_template.rs b/server/src/form_template.rs
index b9bc3982a125e94e67c99175ea9055979541abba..bd4a7195a6eaabfed55333bab5640708ea108b81 100644
--- a/server/src/form_template.rs
+++ b/server/src/form_template.rs
@@ -7,19 +7,30 @@ pub fn template_json_compact<T: Serialize>(v: &T) -> serde_json::Result<String>
     serde_json::to_string(v)
 }
 
-/// Recursively walk the JSON AST and replace `{"$form": "key"}` with the submitted
-/// string for `key` (empty if missing). Other keys are unchanged.
+/// Recursively walk the JSON AST and replace form holes with submitted values.
+///
+/// - `{"$form": "key"}` → string (empty if missing)
+/// - `{"$form:i32": "key"}` → JSON number (0 if missing or unparseable)
 pub fn substitute_form_vars(val: &mut Value, form_data: &HashMap<String, String>) {
     match val {
         Value::Object(map) => {
             if map.len() == 1 {
-                if let Some(Value::String(field_name)) = map.get("$form") {
-                    let submitted = form_data
-                        .get(field_name.as_str())
-                        .map(|s| s.as_str())
-                        .unwrap_or("");
-                    *val = Value::String(submitted.to_string());
-                    return;
+                if let Some((hole_key, Value::String(field_name))) = map.iter().next() {
+                    if let Some(form_type) = hole_key.strip_prefix("$form") {
+                        let submitted = form_data
+                            .get(field_name.as_str())
+                            .map(|s| s.as_str())
+                            .unwrap_or("");
+                        *val = match form_type {
+                            "" => Value::String(submitted.to_string()),
+                            ":i32" => {
+                                let n: i32 = submitted.trim().parse().unwrap_or(0);
+                                Value::Number(n.into())
+                            }
+                            _ => Value::String(submitted.to_string()),
+                        };
+                        return;
+                    }
                 }
             }
             for v in map.values_mut() {
@@ -62,6 +73,45 @@ mod tests {
         text: String,
     }
 
+    #[test]
+    fn i32_holes_become_numbers() {
+        let json = r#"{
+            "ratio_left": {"$form:i32": "ratio_left"},
+            "ratio_right": {"$form:i32": "ratio_right"}
+        }"#;
+        let mut form = HashMap::new();
+        form.insert("ratio_left".into(), "75".into());
+        form.insert("ratio_right".into(), "25".into());
+        let v = fill_template_from_form(json, &form).unwrap();
+        assert_eq!(v["ratio_left"], 75);
+        assert_eq!(v["ratio_right"], 25);
+
+        #[derive(Debug, Deserialize, PartialEq, Eq)]
+        struct Ratios {
+            ratio_left: i32,
+            ratio_right: i32,
+        }
+        let r: Ratios = serde_json::from_value(v).unwrap();
+        assert_eq!(
+            r,
+            Ratios {
+                ratio_left: 75,
+                ratio_right: 25,
+            }
+        );
+    }
+
+    #[test]
+    fn i32_hole_missing_or_bad_defaults_to_zero() {
+        let json = r#"{"n": {"$form:i32": "missing"}}"#;
+        let v = fill_template_from_form(json, &HashMap::new()).unwrap();
+        assert_eq!(v["n"], 0);
+        let mut form = HashMap::new();
+        form.insert("missing".into(), "nope".into());
+        let v = fill_template_from_form(json, &form).unwrap();
+        assert_eq!(v["n"], 0);
+    }
+
     #[test]
     fn holes_become_strings() {
         let json = r#"{
diff --git a/server/src/html/mod.rs b/server/src/html/mod.rs
index 3bf9fc7e92e50beed24e2c25106a77421038c90b..61cdbc094819ddedb755572c59456ec0d6617619 100644
--- a/server/src/html/mod.rs
+++ b/server/src/html/mod.rs
@@ -20,6 +20,8 @@ use crate::{
     ui_action::UI_RPC_FIELD,
 };
 
+pub mod vote;
+
 const SORTER_CSS: &str = include_str!("../../static/sorter.css");
 const SORTER_UI_JS: &str = include_str!("../../static/sorter_ui.js");
 
@@ -131,7 +133,7 @@ fn layout(title: &str, body: Markup, views: u64) -> Markup {
     }
 }
 
-fn item_href(id: &ItemId) -> String {
+pub(crate) fn item_href(id: &ItemId) -> String {
     id.browse_href()
 }
 
@@ -309,11 +311,23 @@ async fn item_page(state: AppState, uri: Uri, item: ItemId) -> Markup {
     let empty_node = NodeState::default();
     let node = tree.get(&item).unwrap_or(&empty_node);
 
+    let child_count = node.children.len();
+    let vote_link = if child_count >= 2 {
+        Some(vote::vote_href(&item))
+    } else {
+        None
+    };
+
     let body = html! {
         h1 { "sorter" }
         (input_panel("", None))
         (breadcrumb_path(&item))
         (entity_section(&item, node, false))
+        @if let Some(href) = vote_link {
+            p class="vote-cta" {
+                a class="btn-primary" href=(href) data-testid="vote-children" { "Vote on children" }
+            }
+        }
         (ranking_panel(&item, node, &tree))
     };
     layout("sorter2", body, views)
diff --git a/server/src/lib.rs b/server/src/lib.rs
index da5f3ebecec1794b05a2a69cc78379551b2ad769..7f7e28c8ac3758de87f1f8e073b24be4132d38da 100644
--- a/server/src/lib.rs
+++ b/server/src/lib.rs
@@ -4,6 +4,7 @@ pub mod events;
 pub mod fetch;
 pub mod form_template;
 pub mod html;
+pub mod pair;
 pub mod parser;
 pub mod path_types;
 pub mod ranking;
@@ -33,6 +34,7 @@ pub fn create_app(state: AppState) -> Router {
         .route("/static/:filename", get(crate::html::serve_static))
         .route("/~/*item_path", get(crate::html::browse))
         .route("/", get(crate::html::home))
+        .route("/vote", get(crate::html::vote::vote_page))
         .route("/ui", post(crate::api::ui_html::post_ui_html))
         .with_state(state)
         .layer(TraceLayer::new_for_http())
diff --git a/server/src/ui_action.rs b/server/src/ui_action.rs
index 2047713762c932ac9bc325fe15624f2aecb3364d..53581e1362bfcc5dfb4ae3069c41ea6f7be41437 100644
--- a/server/src/ui_action.rs
+++ b/server/src/ui_action.rs
@@ -31,6 +31,9 @@ pub enum HtmlUiAction {
         /// Parent node [`ItemId`] string; empty = tree root.
         #[serde(default)]
         scope: String,
+        /// After vote, navigate here (vote compare page).
+        #[serde(default)]
+        next: String,
     },
     /// Parse pasted Reddit URL/path; redirect to subreddit ranking on success.
     ParseQuery {
@@ -70,6 +73,36 @@ pub fn parse_html_ui_from_form(
 mod tests {
     use super::*;
 
+    #[test]
+    fn record_vote_round_trip_with_typed_ratio_holes() {
+        let template = serde_json::json!({
+            "action": "record_vote",
+            "a": "x",
+            "b": "y",
+            "ratio_left": {"$form:i32": "ratio_left"},
+            "ratio_right": {"$form:i32": "ratio_right"},
+            "scope": "parent",
+        });
+        let mut form = HashMap::new();
+        form.insert(
+            UI_RPC_FIELD.to_string(),
+            serde_json::to_string(&template).unwrap(),
+        );
+        form.insert("ratio_left".into(), "60".into());
+        form.

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