constitution · epochs · watch · epoch 3

comparison

c_af08bd851e49 (tommy-mor) vs c_c6f5afec1d36 (tommy-mor)

download prompt · raw event · cmp_78f4ce1edc3ad5

council reasoning

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

Side A introduces a genuinely new, well-tested module (pair.rs) implementing bridge-aware pair selection via connected components, adds a more robust ItemId::from_storage normalization used consistently across reducer/state/reddit import, and refactors the Clojure test harness into a reusable mock-reddit module with new integration/e2e tests. Side B's pool-scoped voting is a reasonable but narrower feature addition that mostly threads an optional pool id through existing vote-compare code with less algorithmic depth and lighter test coverage.

~x-ai/grok-latest · winner A · 5:1 · permalink

A lands foundational pairwise-voting design—new pair selection (bridge-preferring components), a full /vote compare UI with in-place morph after record_vote, ItemId::from_storage normalization, and solid integration/e2e coverage—whereas B only threads an optional pool param and a 'vote on children' link through existing garden vote helpers. A’s changes are larger in lasting product surface and algorithm quality, not merely line count; B is a useful but incremental constraint on already-present compare flow.

openai/gpt-chat-latest · winner A · 5:1 · permalink

Side A delivers substantial new functionality and infrastructure: it adds a dedicated pairwise voting page, pair-selection logic that prioritizes bridge comparisons across ranking components, in-place UI morphing after votes, identifier normalization via `ItemId::from_storage`, and accompanying tests. Side B is a focused extension that threads an optional `pool` parameter through the existing vote flow and adds a 'vote on children' entry point, but it primarily builds on mechanisms that Side A introduces rather than providing comparable foundational value.

sides

A — c_af08bd851e49 (tommy-mor)

message

[2bc302c3] refactor

diff preview

diff --git a/server/src/api/ui_html.rs b/server/src/api/ui_html.rs
index 06001212820101e0cc953d3687dea64f85e60787..d2f9769108def7ca2c5857aec8b4319426188a66 100644
--- a/server/src/api/ui_html.rs
+++ b/server/src/api/ui_html.rs
@@ -47,7 +47,7 @@ pub async fn post_ui_html(
             ratio_left,
             ratio_right,
             scope,
-            next,
+            vote_compare,
         } => {
             let parent = parent_from_scope(&scope);
             if let Err(e) = state
@@ -57,14 +57,12 @@ pub async fn post_ui_html(
                 return ui_js_warn(&e).into_response();
             }
             let tree = state.tree.read().await;
-            if !next.trim().is_empty() {
+            if vote_compare {
+                let left = parse_item_param(&a);
+                let right = parse_item_param(&b);
+                let morph = crate::html::vote::vote_recorded_morph(&tree, &parent, &left, &right);
                 drop(tree);
-                return JsBuilder::new()
-                    .raw(&format!(
-                        "window.location.href={};",
-                        js_string_literal(next.trim())
-                    ))
-                    .into_response();
+                return morph.into_response();
             }
             let empty = crate::reducer::NodeState::default();
             let node = tree.get(&parent).unwrap_or(&empty);
@@ -137,7 +135,7 @@ mod tests {
                 ratio_left: 3,
                 ratio_right: 1,
                 scope: String::new(),
-                next: String::new(),
+                vote_compare: false,
             }
         );
     }
diff --git a/server/src/html/mod.rs b/server/src/html/mod.rs
index 61cdbc094819ddedb755572c59456ec0d6617619..cd578a5fea46a9a1d49e238d08a80c2caf18708d 100644
--- a/server/src/html/mod.rs
+++ b/server/src/html/mod.rs
@@ -65,6 +65,15 @@ impl JsBuilder {
         self
     }
 
+    pub(crate) fn morph_inner_selector(mut self, selector: &str, markup: Markup) -> Self {
+        let html = js_string_literal(&markup.into_string());
+        self.snippets.push(format!(
+            "var __el = document.querySelector({sel}); if (__el) {{ Idiomorph.morph(__el, {html}, {{ morphStyle: 'innerHTML' }}); }}",
+            sel = js_string_literal(selector),
+        ));
+        self
+    }
+
     pub(crate) fn raw(mut self, js: &str) -> Self {
         if !js.is_empty() {
             self.snippets.push(js.to_string());
diff --git a/server/src/html/vote.rs b/server/src/html/vote.rs
new file mode 100644
index 0000000000000000000000000000000000000000..89ed621ad861214e147add2062224fc4137ff8ad
--- /dev/null
+++ b/server/src/html/vote.rs
@@ -0,0 +1,306 @@
+//! Pairwise vote UI — `/vote?parent=` with optional `left` / `right`.
+
+use axum::{
+    extract::{Query, State},
+    response::{Html, IntoResponse},
+};
+use maud::{html, Markup};
+use serde::Deserialize;
+
+use crate::{
+    form_template::template_json_compact,
+    html::JsBuilder,
+    pair::{children_of, resolve_pair, suggest_next_pair_in_pool},
+    path_types::ItemId,
+    reducer::{GlobalTree, GroupState, NodeState, VoteData},
+    state::{parse_item_param, AppState},
+    ui_action::UI_RPC_FIELD,
+};
+
+use super::{breadcrumb_path, item_href, layout};
+
+#[derive(Debug, Deserialize)]
+pub struct VoteQuery {
+    pub parent: String,
+    #[serde(default)]
+    pub left: Option<String>,
+    #[serde(default)]
+    pub right: Option<String>,
+}
+
+pub fn vote_href(parent: &ItemId) -> String {
+    format!(
+        "/vote?parent={}",
+        urlencoding::encode(parent.as_str())
+    )
+}
+
+fn vote_compare_href(parent: &ItemId, left: &ItemId, right: &ItemId) -> String {
+    format!(
+        "/vote?parent={}&left={}&right={}",
+        urlencoding::encode(parent.as_str()),
+        urlencoding::encode(left.as_str()),
+        urlencoding::encode(right.as_str()),
+    )
+}
+
+fn display_label(id: &ItemId) -> String {
+    id.segments()
+        .last()
+        .map_or("item".into(), |v| v.to_string())
+}
+
+fn child_title(tree: &GlobalTree, id: &ItemId) -> String {
+    tree.get(id)
+        .and_then(|n| n.data.as_ref())
+        .map(|d| d.title.clone())
+        .unwrap_or_else(|| display_label(id))
+}
+
+fn ratio_pct(ratio_left: i32, ratio_right: i32) -> f64 {
+    let l = ratio_left.max(0) as f64;
+    let r = ratio_right.max(0) as f64;
+    let sum = l + r;
+    if sum <= 0.0 {
+        50.0
+    } else {
+        (l / sum) * 100.0
+    }
+}
+
+fn ratios_for_page(v: &VoteData, page_left: &ItemId, page_right: &ItemId) -> (i32, i32) {
+    match (v.a.as_str(), v.b.as_str()) {
+        (a, b) if a == page_left.as_str() && b == page_right.as_str() => {
+            (v.ratio_left, v.ratio_right)
+        }
+        (a, b) if a == page_right.as_str() && b == page_left.as_str() => {
+            (v.ratio_right, v.ratio_left)
+        }
+        _ => (v.ratio_left, v.ratio_right),
+    }
+}
+
+fn edge_votes(group: &GroupState, left: &ItemId, right: &ItemId) -> Vec<VoteData> {
+    group
+        .recent_votes
+        .iter()
+        .filter(|v| {
+            (v.a.as_str() == left.as_str() && v.b.as_str() == right.as_str())
+                || (v.a.as_str() == right.as_str() && v.b.as_str() == left.as_str())
+        })
+        .cloned()
+        .collect()
+}
+
+fn vote_edge_history(tree: &GlobalTree, group: &GroupState, left: &ItemId, right: &ItemId) -> Markup {
+    let mut votes = edge_votes(group, left, right);
+    votes.sort_by(|a, b| b.ts.cmp(&a.ts));
+    let legend_left = child_title(tree, left);
+    let legend_right = child_title(tree, right);
+    html! {
+        @if votes.is_empty() {
+            p class="muted vote-edge-empty" { "no votes on this pair yet" }
+        } @else {
+            h3 class="vote-edge-history-title" {
+                "votes on this pair"
+                span class="vote-edge-history-axis muted" { " · " (legend_left) " : " (legend_right) }
+            }
+            ul class="vote-edge-history" {
+                @for v in &votes {
+                    @let (r_left, r_right) = ratios_for_page(v, left, right);
+                    @let pct = ratio_pct(r_left, r_right);
+                    li class="vote-edge-history-row" {
+                        div class="vote-edge-meta" {
+                            span class="vote-edge-ratio" { (format!("{}:{}", r_left, r_right)) }
+                        }
+                        div class="ratio-bar vote-edge-bar" aria-hidden="true" {
+                            div class="ratio-left" style={(format!("width: {:.3}%;", pct))} {}
+                            div class="ratio-right" style={(format!("width: {:.3}%;", 100.0 - pct))} {}
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+fn vote_back_nav(parent: &ItemId) -> Markup {
+    html! {
+        div class="vote-compare-nav" {
+            a class="vote-compare-back muted" href=(item_href(parent)) { "← back to " (display_label(parent)) }
+        }
+    }
+}
+
+fn vote_compare_actions(parent: &ItemId, next: Option<&(ItemId, ItemId)>) -> Markup {
+    let next_href = next.map(|(l, r)| vote_compare_href(parent, l, r));
+    html! {
+        div id="vote-compare-actions" class="vote-compare-actions" {
+            button type="submit" class="btn-primary" data-testid="vote-post" { "post vote" }
+            @if let Some(href) = &next_href {
+                a class="btn-secondary vote-compare-next" data-testid="vote-next-pair" href=(href) { "next pair" }
+            } @else {
+                span class="btn-secondary vote-compare-next is-disabled" { "no next pair" }
+            }
+        }
+    }
+}
+
+/// After recording a vote on the compare page: refresh edge history and next-pair link.
+pub(crate) fn vote_recorded_morph(
+    tree: &GlobalTree,
+    parent: &ItemId,
+    left: &ItemId,
+    right: &ItemId,
+) -> JsBuilder {
+    let pool = children_of(tree, parent);
+    let empty = NodeState::default();
+    let group = tree
+        .get(parent)
+        .unwrap_or(&empty)
+        .local_ranking
+        .clone();
+    let edge_history = vote_edge_history(tree, &group, left, right);
+    let next_pair = suggest_next(&group, left, right, &pool);
+    let actions = vote_compare_actions(parent, next_pair.as_ref());
+    JsBuilder::new()
+        .morph_inner_selector("#vote-edge-history-region", edge_history)
+        .morph_selector("#vote-compare-actions", actions)
+}
+
+fn vote_compare_item_card(tree: &GlobalTree, item: &ItemId, side_class: &str) -> Markup {
+    let href = item_href(item);
+    let title = child_title(tree, item);
+    html! {
+        div class=(format!("vote-compare-side {side_class}")) {
+            a class=(format!("vote-compare-item {side_class}")) href=(href) {
+                @if let Some(row) = crate::render::reddit::child_row_markup(tree, item, &href) {
+                    (row)
+                } @else {
+                    strong { (title) }
+                }
+            }
+            @if let Some(node) = tree.get(item) {
+                @if crate::render::reddit::is_reddit_post(item) {
+                    @if let Some(data) = &node.data {
+                        @if let Some(src) = data.image_url.as_ref().or(data.thumb_url.as_ref()) {
+                            figure class="vote-compare-figure" {
+                                img class="vote-compare-image" src=(src) alt="" loading="lazy";
+                            }
+                        }
+                        @if let Some(author) = &data.author {
+                            p class="muted small" { "by " (author) }
+                        }
+                    }
+                } @else if let Some(data) = &node.data {
+                    @if let Some(body) = &data.body_html {
+                        div class="vote-compare-item-body" {
+                            (maud::PreEscaped(body))
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+
+fn suggest_next(group: &GroupState, left: &ItemId, right: &ItemId, pool: &[ItemId]) -> Option<(ItemId, ItemId)> {
+    suggest_next_pair_in_pool(group, pool, Some((left, right)))
+}
+
+pub async fn vote_page(
+    State(state): State<AppState>,
+    Query(q): Query<VoteQuery>,
+) -> impl IntoResponse {
+    let parent = parse_item_param(&q.parent);
+    let left_param = q.left.as_deref().map(parse_item_param);
+    let right_param = q.right.as_deref().map(parse_item_param);
+
+    let tree = state.tree.read().await;
+    let empty = NodeState::default();
+    let parent_node = tree.get(&parent).unwrap_or(&empty);
+
+    let (left, right) = match resolve_pair(
+        &tree,
+        &parent,
+        left_param.as_ref(),
+        right_param.as_ref(),
+    ) {
+        Ok(p) => p,
+        Err(e) => {
+            let (msg, status) = e.status_message();
+            return (status, msg).into_response();
+        }
+    };
+
+    let pool = children_of(&tree, &parent);
+    let group = &parent_node.local_ranking;
+    let next_pair = suggest_next(group, &left, &right, &pool);
+    let edge_history = vote_edge_history(&tree, group, &left, &right);
+
+    let rpc_json = template_json_compact(&serde_json::json!({
+        "action": "record_vote",
+        "a": left.as_str(),
+        "b": right.as_str(),
+        "ratio_left": {"$form:i32": "ratio_left"},
+        "ratio_right": {"$form:i32": "ratio_right"},
+        "scope": parent.as_str(),
+        "vote_compare": true,
+    }))
+    .expect("vote rpc json");
+
+    let title = format!(
+        "vote — {} vs {}",
+        child_title(&tree, &left),
+        child_title(&tree, &right)
+    );
+
+    let body = html! {
+        section class="vote-compare-shell" {
+            h1 { "compare" }
+            (breadcrumb_path(&parent))
+            p class="muted vote-compare-scope" {
+                "ranking children of "
+                a href=(item_href(&par

… preview truncated; 32,381 characters omitted

download full diff A

B — c_c6f5afec1d36 (tommy-mor)

message

[5350388a] Add pool-scoped voting: /vote?pool=<parent> picks pairs from children.

- /vote now accepts an optional `pool` param (parent item path). When
  provided without left/right, it picks the first unvoted pair from the
  pool's children. When provided alongside left/right, it constrains
  "next pair" navigation to siblings within the pool.
- "vote on children" button appears on item pages with ≥2 children,
  linking to /vote?pool=<item>.
- Pool is threaded through VoteComparePost → success JS so in-page
  morph after voting keeps the pool context for next-pair navigation.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

diff preview

diff --git a/server/src/api/ui_html.rs b/server/src/api/ui_html.rs
index 5faa642451d69555cb391974beb0ad22c9355c8c..b79efdb4d52bd445a67f38cbfd61d3507d2b3014 100644
--- a/server/src/api/ui_html.rs
+++ b/server/src/api/ui_html.rs
@@ -193,6 +193,7 @@ async fn dispatch_ui_action(
             ratio_right,
             explanation,
             next,
+            pool,
             form_action,
         } => {
             if form_action != "/ui" {
@@ -239,6 +240,9 @@ async fn dispatch_ui_action(
                         .into_response();
                 }
             };
+            let pool_id = pool.as_deref().and_then(|p| {
+                crate::path_types::ItemId::parse(p.trim()).map(|i| i.normalized_storage())
+            });
             let mut rl = ratio_left.trim().parse::<i32>().unwrap_or(0).max(0);
             let mut rr = ratio_right.trim().parse::<i32>().unwrap_or(0).max(0);
             if rl == 0 && rr == 0 {
@@ -294,6 +298,7 @@ async fn dispatch_ui_action(
                         &thread_tag,
                         &left_id,
                         &right_id,
+                        pool_id.as_ref(),
                         pid.as_str(),
                         post_index,
                     )
diff --git a/server/src/html/garden/pin.rs b/server/src/html/garden/pin.rs
index 5865cfdbc06aeb6555c97380e25591fae6b3d125..1820d7fe7ee167ecbf5ad5124f23b2ab92ffb01f 100644
--- a/server/src/html/garden/pin.rs
+++ b/server/src/html/garden/pin.rs
@@ -79,7 +79,7 @@ pub(super) fn ont_pin_vote_controls(
                         }
                     }
                 } @else {
-                    a class="ont-vote-compare-btn" href=(vote_compare_href(nav, pi, &current, None)) title="Compare and vote" {
+                    a class="ont-vote-compare-btn" href=(vote_compare_href(nav, pi, &current, None, None)) title="Compare and vote" {
                         span class="ont-vote-glyph" aria-hidden="true" { "⚖" }
                         span { "vote" }
                     }
@@ -121,7 +121,7 @@ pub(super) fn child_row_pin_or_vote(
                         if nv == 1 { "" } else { "s" },
                     );
                     @let aria = format!("Vote; {} pairwise {}", nv, if nv == 1 { "vote" } else { "votes" });
-                    a class="ont-garden-vote-ico" href=(vote_compare_href(nav, pi, row_item, None)) title=(tip) aria-label=(aria) {
+                    a class="ont-garden-vote-ico" href=(vote_compare_href(nav, pi, row_item, None, None)) title=(tip) aria-label=(aria) {
                         span class="ont-garden-vote-glyph" aria-hidden="true" { "⚖" }
                         span class="ont-garden-vote-count" { (format!("{}", nv)) }
                     }
diff --git a/server/src/html/garden/render.rs b/server/src/html/garden/render.rs
index 5c3986ca36902f6c9019a4b5590f0b3b9d2cb4ff..bd8cbce059ee789de6e8dc9b6f69f54beee2f994 100644
--- a/server/src/html/garden/render.rs
+++ b/server/src/html/garden/render.rs
@@ -29,6 +29,7 @@ use super::{
     item::{child_depth_from_uri, item_code_label, item_display_path, item_href},
     item_page::{build_item_page_view_model, sibling_nav_markup},
     pin::{child_row_pin_or_vote, ont_pin_vote_controls, pinned_item_from_jar},
+    vote::vote_pool_href,
 };
 
 pub(super) async fn render_scope_view(
@@ -186,12 +187,21 @@ pub(super) async fn render_scope_view(
             }
 
             section class="ont-tab-panel ont-tab-panel-children" {
+                @let total_children = model.child_rankings.component_rankings
+                    .iter().map(|c| c.ranked.len()).sum::<usize>()
+                    + model.child_rankings.unranked_items.len();
                 h3 {
                     "ranked child groups"
                     @if model.child_depth > 1 {
                         " "
                         span class="muted" { (format!("(depth {})", model.child_depth)) }
                     }
+                    @if total_children >= 2 {
+                        " "
+                        a class="ont-vote-children-btn" href=(vote_pool_href(&nav, &model.item)) {
+                            "vote on children"
+                        }
+                    }
                 }
                 @if model.child_rankings.component_rankings.is_empty() {
                     p class="muted" { "no voted pairs yet in this scope" }
diff --git a/server/src/html/garden/tests.rs b/server/src/html/garden/tests.rs
index 6900a6795bcde866a176722149d6378e5127b4c3..c2036fca7752aef63d260e36cfe9649f63b5c550 100644
--- a/server/src/html/garden/tests.rs
+++ b/server/src/html/garden/tests.rs
@@ -105,7 +105,7 @@ fn suggest_next_vote_pair_prefers_unvoted_sibling_pair() {
     let content = content_for_garden_view(&reduced, &ScopeId::Public);
     let a = ItemId::parse("~/topic/a").unwrap().normalized_storage();
     let b = ItemId::parse("~/topic/b").unwrap().normalized_storage();
-    let next = suggest_next_vote_pair(content, &a, &b).expect("next sibling pair");
+    let next = suggest_next_vote_pair(content, &a, &b, None).expect("next sibling pair");
     assert_ne!(
         canonical_edge_items(&next.0, &next.1),
         canonical_edge_items(&a, &b)
diff --git a/server/src/html/garden/vote.rs b/server/src/html/garden/vote.rs
index 1d7fc8aa7436bfa9c1186dfd940a8d751ab7e088..2682cfcbd2f834b56459a02831aa225cffe67c58 100644
--- a/server/src/html/garden/vote.rs
+++ b/server/src/html/garden/vote.rs
@@ -211,14 +211,15 @@ pub(crate) async fn vote_compare_post_success_js(
     _thread_tag: &str,
     left: &ItemId,
     right: &ItemId,
+    pool: Option<&ItemId>,
     _post_id: &str,
     _post_idx: Option<usize>,
 ) -> String {
     let reduced = state.reduced.read().await;
     let content = content_for_garden_view(&reduced, &nav.scope());
     let edge_history = vote_edge_history_markup(content, left, right);
-    let next_pair = suggest_next_vote_pair(content, left, right);
-    let nav_markup = vote_compare_nav_markup(nav, next_pair.as_ref());
+    let next_pair = suggest_next_vote_pair(content, left, right, pool);
+    let nav_markup = vote_compare_nav_markup(nav, next_pair.as_ref(), pool);
     drop(reduced);
     JsBuilder::new()
         .morph_inner_selector("#vote-edge-history-region", edge_history)
@@ -231,27 +232,39 @@ pub(super) fn vote_compare_href(
     left: &ItemId,
     right: &ItemId,
     thread_override: Option<&str>,
+    pool: Option<&ItemId>,
 ) -> String {
     let left_q = urlencoding::encode(left.as_str());
     let right_q = urlencoding::encode(right.as_str());
-    let base = format!(
+    let mut base = format!(
         "{}/vote?left={}&right={}",
         nav.room_path_prefix_for_vote_compare(),
         left_q,
         right_q
     );
     if let Some(t) = thread_override.filter(|s| !s.is_empty()) {
-        format!("{}&thread={}", base, urlencoding::encode(t))
-    } else {
-        base
+        base = format!("{}&thread={}", base, urlencoding::encode(t));
+    }
+    if let Some(p) = pool {
+        base = format!("{}&pool={}", base, urlencoding::encode(p.as_str()));
     }
+    base
+}
+
+pub(super) fn vote_pool_href(nav: &ThreadNav, pool_item_str: &str) -> String {
+    format!(
+        "{}/vote?pool={}",
+        nav.room_path_prefix_for_vote_compare(),
+        urlencoding::encode(pool_item_str)
+    )
 }
 
 fn vote_compare_nav_markup(
     nav: &ThreadNav,
     next_pair: Option<&(ItemId, ItemId)>,
+    pool: Option<&ItemId>,
 ) -> maud::Markup {
-    let next_pair_href = next_pair.map(|(nl, nr)| vote_compare_href(nav, nl, nr, None));
+    let next_pair_href = next_pair.map(|(nl, nr)| vote_compare_href(nav, nl, nr, None, pool));
     html! {
         div class="vote-compare-nav" {
             @if let Some(href) = &next_pair_href {
@@ -267,8 +280,15 @@ pub(super) fn suggest_next_vote_pair(
     content: &ContentState,
     current_left: &ItemId,
     current_right: &ItemId,
+    pool_parent: Option<&ItemId>,
 ) -> Option<(ItemId, ItemId)> {
-    let pool: Vec<ItemId> = if current_left.parent().as_ref().map(|p| p.as_str())
+    let pool: Vec<ItemId> = if let Some(parent) = pool_parent {
+        content
+            .item_children
+            .get(parent)
+            .map(|s| s.iter().cloned().collect())
+            .unwrap_or_default()
+    } else if current_left.parent().as_ref().map(|p| p.as_str())
         == current_right.parent().as_ref().map(|p| p.as_str())
     {
         current_left
@@ -322,10 +342,14 @@ pub(super) fn vote_compare_item_card(
 }
 #[derive(Debug, Deserialize)]
 pub struct VoteCompareQuery {
-    pub left: String,
-    pub right: String,
+    #[serde(default)]
+    pub left: Option<String>,
+    #[serde(default)]
+    pub right: Option<String>,
     #[serde(default)]
     pub thread: Option<String>,
+    #[serde(default)]
+    pub pool: Option<String>,
 }
 
 /// Public pairwise vote UI — `/vote?left=&right=&thread=`.
@@ -376,17 +400,53 @@ async fn vote_compare_inner(
     jar: CookieJar,
     uri: Uri,
 ) -> axum::response::Response {
-    let left = match ItemId::parse(q.left.trim()) {
-        Some(i) => i.normalized_storage(),
-        None => return (StatusCode::NOT_FOUND, "bad left item").into_response(),
+    let pool_id: Option<ItemId> = match q.pool.as_deref() {
+        Some(p) => match ItemId::parse(p.trim()) {
+            Some(i) => Some(i.normalized_storage()),
+            None => return (StatusCode::BAD_REQUEST, "bad pool item").into_response(),
+        },
+        None => None,
     };
-    let right = match ItemId::parse(q.right.trim()) {
-        Some(i) => i.normalized_storage(),
-        None => return (StatusCode::NOT_FOUND, "bad right item").into_response(),
+
+    let (left, right) = match (q.left.as_deref(), q.right.as_deref()) {
+        (Some(l), Some(r)) => {
+            let left = match ItemId::parse(l.trim()) {
+                Some(i) => i.normalized_storage(),
+                None => return (StatusCode::NOT_FOUND, "bad left item").into_response(),
+            };
+            let right = match ItemId::parse(r.trim()) {
+                Some(i) => i.normalized_storage(),
+                None => return (StatusCode::NOT_FOUND, "bad right item").into_response(),
+            };
+            if left == right {
+                return (StatusCode::BAD_REQUEST, "items must differ").into_response();
+            }
+            (left, right)
+        }
+        (None, None) => {
+            let Some(pool) = pool_id.as_ref() else {
+                return (StatusCode::BAD_REQUEST, "provide left+right or pool").into_response();
+            };
+            let reduced = state.reduced.read().await;
+            let content = content_for_garden_view(&reduced, &nav.scope());
+            let children: Vec<ItemId> = content
+                .item_children
+                .get(pool)
+                .map(|s| s.iter().cloned().collect())
+                .unwrap_or_default();
+            if children.len() < 2 {
+                drop(reduced);
+                return (StatusCode::BAD_REQUEST, "pool has fewer than 2 children to compare").into_response();
+            }
+            let pair = suggest_next_pair_in_pool(&content.ranking_group, &children, None);
+            drop(reduced);
+            match pair {
+                Some(p) => p,
+                None => return (StatusCode::BAD_REQUEST, "no pairs available in pool").into_response(),
+            }
+        }
+        _ => return (StatusCode::BAD_REQUEST, "provide both left and right, or just pool").into_response(),
     };
-    if left == right {
-        return (StatusCode::BAD_REQUEST, "items must differ").into_response();
-    }
 
     let reduced = state.reduced.read().await;
     let content = content_for_garden_view(&reduced, &nav.scope());
@@ -409,7 +469,7 @@ async fn vote_compare_inner(
     let left_body = content.item_bodies.get(&left).cloned();
     let right_body = content.item_bodies.get(&right).cloned();
     let item_bodies_for_cards = content.item_bodies.

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