constitution · epochs · watch · epoch 3

comparison

c_8dc1a8119370 (tommy-mor) vs c_c42f908efc44 (tommy-mor)

download prompt · raw event · cmp_a5bc9099996d4a

council reasoning

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

Side A removes an unreliable, ~1800-line keystroke-parsing state machine (plus its debounce/race-mitigation JS and a whole Playwright race test) and replaces it with a much simpler, correct paste-and-go flow, eliminating a real class of bugs and maintenance burden. Side B is a solid type-safety refactor (Deref impls, CanonicalItemUrl propagation) that reduces stringly-typed bugs, but it's incremental internal cleanup rather than fixing a demonstrably broken user-facing feature.

~x-ai/grok-latest · winner A · 4:1 · permalink

A removes an ~1800-line unreliable keystroke graph parser, parser_action, race-handling JS, and Playwright race test, replacing them with a small correct paste-and-go URL parser and redirect that still covers real Reddit paths. B only threads CanonicalItemUrl and adds Deref on href newtypes—useful type hygiene without changing product behavior—so the design simplification and bug-class removal in A carry more lasting value.

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

Side B strengthens core data modeling by changing `resolve_item` to return `CanonicalItemUrl`, propagating that typed identifier through validation, ranking, pair selection, and scope-change computation, eliminating repeated parse/wrap conversions and reducing stringly-typed APIs. Side A replaces a rich autocomplete/graph parser with a much simpler paste-and-go flow and deletes substantial parser logic and tests, which simplifies maintenance but also removes existing capabilities rather than improving the underlying architecture.

sides

A — c_8dc1a8119370 (tommy-mor)

message

[529cc941] Replace autocomplete parser with paste-and-go navigate.

The keystroke transition graph was unreliable; a textarea plus Go button now parses pasted Reddit URLs and redirects to the subreddit ranking scope.

Co-authored-by: Cursor <cursoragent@cursor.com>

diff preview

diff --git a/AGENTS.md b/AGENTS.md
index 77f2e31d4e860a92a77255ca5106c8b6c4510ee7..36ee4c0ec700bffbe226ee775ba9cf59cf35c770 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -11,7 +11,6 @@ Single Rust web app **`sorter2-server`**: pairwise voting, rank-centrality ranki
 - **Rust 1.88+** is required (some transitive crates need a recent Cargo). The image may ship older `/usr/local/cargo` (1.83); use **rustup** and `rustup default 1.88.0` before building.
 - **System packages** for builds: `pkg-config`, `libssl-dev` (for `reqwest` / OpenSSL in integration tests and release builds).
 - **Clojure CLI 1.12.0.1530** (optional but used in CI): install from https://clojure.org/guides/install_clojure — needed for `./scripts/clj-test.sh` / Kaocha tests.
-- **Playwright browser** for the spel browser test (`test/parser_race.clj`): install once with `clojure -M -e "(com.microsoft.playwright.CLI/main (into-array String [\"install\" \"chromium\" \"--with-deps\"]))"`. The browser binary is cached under `~/.cache/ms-playwright`.
 
 ### Commands (see also `TEST.sh`)
 
diff --git a/server/src/api/ui_html.rs b/server/src/api/ui_html.rs
index 1339048c955c0a3eb5120381aaf031424cbed540..c4ab9d65c7b3cd42a5b4d093ba429993c101e9a8 100644
--- a/server/src/api/ui_html.rs
+++ b/server/src/api/ui_html.rs
@@ -8,7 +8,7 @@ use std::collections::HashMap;
 use crate::{
     html::{js_string_literal, ranking_panel, JsBuilder},
     parser::parse_reddit_url,
-    parser_render::parser_panel_morph,
+    parser_render::navigate_panel,
     state::AppState,
     ui_action::{parse_html_ui_from_form, HtmlUiAction},
 };
@@ -57,18 +57,23 @@ pub async fn post_ui_html(
                 .morph_selector("#ranking-panel", panel)
                 .into_response()
         }
-        HtmlUiAction::ParseQuery { query } => {
-            let action = parse_reddit_url(&query);
-            let panel = parser_panel_morph(&query, &action);
-            let mut js = JsBuilder::new().morph_selector("#parser-panel", panel);
-            if let Some(comp) = action.primary_completion() {
-                js = js.raw(&format!(
-                    "var __pi=document.getElementById('parser-input'); if(__pi){{__pi.dataset.completion={};}}",
-                    js_string_literal(comp)
-                ));
+        HtmlUiAction::ParseQuery { query } => match parse_reddit_url(&query) {
+            Ok(subreddit) => {
+                let dest = format!("/?sub={subreddit}");
+                JsBuilder::new()
+                    .raw(&format!(
+                        "window.location.href={};",
+                        js_string_literal(&dest)
+                    ))
+                    .into_response()
             }
-            js.into_response()
-        }
+            Err(message) => {
+                let panel = navigate_panel(&query, Some(&message));
+                JsBuilder::new()
+                    .morph_selector("#parser-panel", panel)
+                    .into_response()
+            }
+        },
     }
 }
 
diff --git a/server/src/html/mod.rs b/server/src/html/mod.rs
index 94a5cfb561d1c8464bd2782f7ffd4e0965ccf95d..9650d333d29c4ac94ceb407aee3ee00399c7f40b 100644
--- a/server/src/html/mod.rs
+++ b/server/src/html/mod.rs
@@ -11,8 +11,7 @@ use serde::Deserialize;
 
 use crate::{
     form_template::template_json_compact,
-    parser_action::ParserAction,
-    parser_render::parser_panel,
+    parser_render::navigate_panel,
     ranking::{top_bottom, RankedItem},
     reducer::GroupState,
     state::{normalize_scope, AppState},
@@ -336,10 +335,9 @@ pub async fn home(
     let empty = GroupState::new();
     let group = groups.get(&scope).unwrap_or(&empty);
 
-    let empty_action = ParserAction::suggest(String::new(), None);
     let body = html! {
         h1 { "sorter2" }
-        (parser_panel("", &empty_action))
+        (navigate_panel("", None))
         (vote_panel(&scope))
         (ranking_panel(&scope, group))
     };
diff --git a/server/src/lib.rs b/server/src/lib.rs
index fa423640d598f4ba97a5885d228e78d7b97f7a22..de8bca48cbf689cad22337883e7791966e7c4919 100644
--- a/server/src/lib.rs
+++ b/server/src/lib.rs
@@ -4,7 +4,6 @@ pub mod events;
 pub mod form_template;
 pub mod html;
 pub mod parser;
-pub mod parser_action;
 pub mod parser_render;
 pub mod path_types;
 pub mod ranking;
diff --git a/server/src/parser.rs b/server/src/parser.rs
index ea437c4434045b44cba04a2b3416df850db518e7..50571a59f0d3ece1e2538f88e00ef46ec40ea545 100644
--- a/server/src/parser.rs
+++ b/server/src/parser.rs
@@ -1,1811 +1,87 @@
-use std::collections::HashMap;
-use std::sync::OnceLock;
+//! Extract a subreddit name from a pasted Reddit URL or path.
 
-use crate::parser_action::{GuideOption, ParserAction, ScrollingSuggestion, Suggestion};
-
-// --- Core Abstractions ---
-
-/// Unique identifier for nodes in the graph
-type NodeId = &'static str;
-
-/// Pattern matching for edges
-#[derive(Debug, Clone)]
-pub enum EdgePattern {
-    /// Matches exact literal string
-    Literal(&'static str),
-    
-    /// Matches any prefix of a string and suggests the full string
-    /// e.g., PrefixOf("reddit.com") matches "r", "re", "red", "reddit", "reddit.com"
-    PrefixOf(&'static str),
-    
-    /// Captures a variable segment (e.g., subreddit name, username)
-    Variable(&'static str),
-    
-    /// Matches any string (wildcard)
-    Any,
-}
-
-impl EdgePattern {
-    /// Try to match this pattern against input, return (consumed_chars, captured_value)
-    fn matches(&self, input: &str) -> Option<(usize, Option<String>)> {
-        match self {
-            EdgePattern::Literal(lit) => {
-                if input.starts_with(lit) {
-                    Some((lit.len(), None))
-                } else {
-                    None
-                }
-            }
-            EdgePattern::PrefixOf(target) => {
-                // Check if input is a prefix of target
-                if target.starts_with(input) && !input.is_empty() {
-                    // It's a valid prefix
-                    Some((input.len(), None))
-                } else if input.starts_with(target) {
-                    // Full match
-                    Some((target.len(), None))
-                } else {
-                    None
-                }
-            }
-            EdgePattern::Variable(var_name) => {
-                // Consume until next '/' or end of string
-                let end = input.find('/').unwrap_or(input.len());
-                if end > 0 {
-                    let captured = input[..end].to_string();
-                    // Validate based on variable type
-                    if is_valid_variable(var_name, &captured) {
-                        Some((end, Some(captured)))
-                    } else {
-                        None
-                    }
-                } else {
-                    None
-                }
-            }
-            EdgePattern::Any => {
-                // Match everything until next '/' or end
-                let end = input.find('/').unwrap_or(input.len());
-                if end > 0 {
-                    Some((end, Some(input[..end].to_string())))
-                } else {
-                    None
-                }
-            }
-        }
-    }
-    
-    /// Get the completion suggestion for this pattern
-    fn completion(&self, partial: &str) -> Option<String> {
-        match self {
-            EdgePattern::PrefixOf(target) => {
-                if target.starts_with(partial) && partial != *target {
-                    Some(target.to_string())
-                } else {
-                    None
-                }
-            }
-            _ => None,
-        }
+pub fn parse_reddit_url(query: &str) -> Result<String, String> {
+    let q = query.trim();
+    if q.is_empty() {
+        return Err("Paste a Reddit URL or r/subreddit path".into());
     }
-}
 
-/// Edge in the graph
-pub struct Edge {
-    pattern: EdgePattern,
-    target: NodeId,
-    /// Optional description for autocomplete
-    description: Option<&'static str>,
-}
-
-/// Handler function for generating UI actions (Send + Sync so the graph can live in `OnceLock`).
-type Handler = Box<dyn Fn(&str, &str, &HashMap<String, String>) -> ParserAction + Send + Sync>;
-
-/// Node in the graph
-pub struct Node {
-    #[allow(dead_code)]
-    id: NodeId,
-    edges: Vec<Edge>,
-    handler: Option<Handler>,
-}
-
-/// The composable parser graph (immutable after `build`).
-pub struct Graph {
-    nodes: HashMap<NodeId, Node>,
-    root: NodeId,
-}
-
-// --- Graph Builder (Fluent API) ---
-
-pub struct GraphBuilder {
-    nodes: HashMap<NodeId, Node>,
-    current_node: Option<NodeId>,
-    root: NodeId,
-}
-
-impl GraphBuilder {
-    pub fn new() -> Self {
-        let mut nodes = HashMap::new();
-        nodes.insert(
-            "root",
-            Node {
-                id: "root",
-                edges: Vec::new(),
-                handler: None,
-            },
-        );
-
-        GraphBuilder {
-            nodes,
-            current_node: Some("root"),
-            root: "root",
-        }
+    if let Some(sub) = subreddit_after_prefix(q, "r/") {
+        return Ok(sub);
     }
 
-    /// Select a node to add edges to
-    pub fn at(mut self, node_id: NodeId) -> Self {
-        self.nodes.entry(node_id).or_insert_with(|| Node {
-            id: node_id,
-            edges: Vec::new(),
-            handler: None,
-        });
-        self.current_node = Some(node_id);
-        self
+    if let Some(sub) = subreddit_from_path_segment(q, "/r/") {
+        return Ok(sub);
     }
-    
-    /// Add an edge from the current node
-    pub fn edge(self, pattern: EdgePattern, target: NodeId) -> Self {
-        self.edge_with_desc(pattern, target, None)
-    }
-    
-    /// Add an edge with description
-    pub fn edge_with_desc(
-        mut self,
-        pattern: EdgePattern,
-        target: NodeId,
-        desc: Option<&'static str>,
-    ) -> Self {
-        let current = self.current_node.expect("No current node selected");
-
-        self.nodes.entry(target).or_insert_with(|| Node {
-            id: target,
-            edges: Vec::new(),
-            handler: None,
-        });
-
-        if let Some(node) = self.nodes.get_mut(current) {
-            node.edges.push(Edge {
-                pattern,
-                target,
-                description: desc,
-            });
-        }
 
-        self
-    }
-
-    /// Set handler for current node
-    pub fn handler<F>(mut self, handler: F) -> Self
-    where
-        F: Fn(&str, &str, &HashMap<String, String>) -> ParserAction + Send + Sync + 'static,
-    {
-        let current = self.current_node.expect("No current node selected");
-        if let Some(node) = self.nodes.get_mut(current) {
-            node.handler = Some(Box::new(handler));
-        }
-        self
-    }
-    
-    /// Build the final graph
-    pub fn build(self) -> Graph {
-        Graph {
-            nodes: self.nodes,
-            root: self.root,
-        }
-    }
+    Err("Could not find a subreddit in that URL".into())
 }
 
-// --- Parser Implementation ---
-
-impl Graph {
-    pub fn parse(&self, input: &str) -> ParserAction {
-        let normalized = input.trim().to_lowercase();
-        let mut state = ParserState {
-            input: &normalized,
-            cursor: 0,
-            current_node_id: self.root,
-            context: HashMap::new(),
-            original_query: input.to_string(),
-            current_prefix: String::new(),
-        };
-        
-        self.parse_recursive(&mut state)
-    }
-    
-    fn parse_recursive(&self, state: &mut ParserState) -> ParserAction {
-        let node = self
-            .nodes
-            .get(state.current_node_id)
-            .expect("Node not found in graph");
-
-        // If we've consumed all input, check for handler or suggestions
-        if state.cursor >= state.input.len() {
-            if let Some(handler) = &node.han

… preview truncated; 92,533 characters omitted

download full diff A

B — c_c42f908efc44 (tommy-mor)

message

[674964ef] refactor: Deref for href newtypes, CanonicalItemUrl through resolve_item

- Implement Deref<Target=str> for GardenItemUrl, ForumThreadUrl, TildeOntologyPath
- resolve_item returns CanonicalItemUrl; validate uses HashSet<CanonicalItemUrl>
- compute_scope_rank_changes keys are CanonicalItemUrl; pair RPC uses Vec pool
- pick_random_distinct_canonical; connectivity stats on &[CanonicalItemUrl]
- Global rank unranked uses stored ids before GardenItemUrl mapping

Made-with: Cursor

diff preview

diff --git a/server/src/api/helpers.rs b/server/src/api/helpers.rs
index 03b3e77911ccd662bec8635345dafe2593cf242e..1b291db83df7364a026f2e147e0a29a70a399371 100644
--- a/server/src/api/helpers.rs
+++ b/server/src/api/helpers.rs
@@ -30,13 +30,13 @@ pub fn now_ms() -> i64 {
     t.as_millis() as i64
 }
 
-/// Resolve an item path as a first-class canonical path.
-pub fn resolve_item(item: &str) -> Result<String, String> {
+/// Resolve DSL/user input to a stored canonical item id.
+pub fn resolve_item(item: &str) -> Result<CanonicalItemUrl, String> {
     let canonical = canonicalize_item(item);
     if canonical.is_empty() {
         return Err(format!("empty item path: `{}`", item));
     }
-    Ok(canonical)
+    Ok(CanonicalItemUrl(canonical))
 }
 
 pub fn parse_parent_specs(parent: Option<&String>) -> Vec<String> {
@@ -94,7 +94,7 @@ pub fn paginate_rankings(
     (out_components, out_unranked)
 }
 
-pub fn pick_random_distinct(items: &[String]) -> Option<(String, String)> {
+pub fn pick_random_distinct_canonical(items: &[CanonicalItemUrl]) -> Option<(CanonicalItemUrl, CanonicalItemUrl)> {
     use rand::seq::SliceRandom;
     if items.len() < 2 {
         return None;
@@ -123,15 +123,12 @@ pub fn is_pair_voted(group: &crate::reducer::GroupState, a: &str, b: &str) -> bo
     group.voted_pairs.contains(&(i, j))
 }
 
-pub fn compute_connectivity_stats(group: &crate::reducer::GroupState, pool: &[String]) -> ConnectivityStats {
+pub fn compute_connectivity_stats(group: &crate::reducer::GroupState, pool: &[CanonicalItemUrl]) -> ConnectivityStats {
     let n = pool.len();
 
     let global_idxs: Vec<Option<usize>> = pool
         .iter()
-        .map(|it| {
-            let key = CanonicalItemUrl(it.clone());
-            group.item_to_idx.get(&key).copied()
-        })
+        .map(|it| group.item_to_idx.get(it).copied())
         .collect();
     let present: Vec<usize> = global_idxs.iter().filter_map(|x| *x).collect();
 
diff --git a/server/src/api/mod.rs b/server/src/api/mod.rs
index cf22cb0129366c3aed031bc86f3197a4321cb806..a10ce662105cff8fad949c6b83f7035ce79bed18 100644
--- a/server/src/api/mod.rs
+++ b/server/src/api/mod.rs
@@ -24,7 +24,7 @@ pub use auth::{
 
 pub use helpers::{
     api_error, compute_connectivity_stats, is_pair_voted, now_ms, paginate_rankings,
-    parse_parent_specs, pick_random_distinct, resolve_item, sha256_hex, vote_touches_path,
+    parse_parent_specs, pick_random_distinct_canonical, resolve_item, sha256_hex, vote_touches_path,
 };
 
 pub use rpc::handle_rpc_batch;
diff --git a/server/src/api/rpc.rs b/server/src/api/rpc.rs
index 5f7d50188f1381267402f2e57e671234ef5db2fd..de0955d0887d32740e1fd18365205c5bdb53c247 100644
--- a/server/src/api/rpc.rs
+++ b/server/src/api/rpc.rs
@@ -29,7 +29,7 @@ use crate::{
 use super::auth::verify_bearer_principal;
 use super::helpers::{
     compute_connectivity_stats, is_pair_voted, now_ms, paginate_rankings, parse_parent_specs,
-    pick_random_distinct, resolve_item, vote_touches_path,
+    pick_random_distinct_canonical, resolve_item, vote_touches_path,
 };
 use super::validate::{normalize_room_and_thread, validate_ingest_document};
 
@@ -146,21 +146,21 @@ fn authorize_room_read(reduced: &ReducerState, headers: &HeaderMap, room: &str)
 }
 
 fn compute_scope_rank_changes(
-    parent: &str,
+    parent: &CanonicalItemUrl,
     before: &crate::scope_rank::ChildrenRankings,
     after: &crate::scope_rank::ChildrenRankings,
     room_wire: &str,
 ) -> Option<ScopeRankChanges> {
-    fn build_positions(rankings: &crate::scope_rank::ChildrenRankings) -> HashMap<String, Option<RankPosition>> {
+    fn build_positions(rankings: &crate::scope_rank::ChildrenRankings) -> HashMap<CanonicalItemUrl, Option<RankPosition>> {
         let mut map = HashMap::new();
         for comp in &rankings.component_rankings {
             let total = comp.ranked.len();
             for (i, item) in comp.ranked.iter().enumerate() {
-                map.insert(item.item.as_str().to_string(), Some(RankPosition { rank: i + 1, of: total }));
+                map.insert(item.item.clone(), Some(RankPosition { rank: i + 1, of: total }));
             }
         }
         for item in &rankings.unranked_items {
-            map.insert(item.as_str().to_string(), None);
+            map.insert(item.clone(), None);
         }
         map
     }
@@ -168,7 +168,7 @@ fn compute_scope_rank_changes(
     let before_pos = build_positions(before);
     let after_pos = build_positions(after);
 
-    let all_items: std::collections::BTreeSet<String> = before_pos.keys().cloned()
+    let all_items: std::collections::BTreeSet<CanonicalItemUrl> = before_pos.keys().cloned()
         .chain(after_pos.keys().cloned())
         .collect();
 
@@ -184,7 +184,7 @@ fn compute_scope_rank_changes(
         };
         if changed {
             changes.push(RankChange {
-                item: GardenItemUrl::from_storage_str(&item, room_wire),
+                item: GardenItemUrl::from_stored(&item, room_wire),
                 before: b,
                 after: a,
             });
@@ -203,11 +203,7 @@ fn compute_scope_rank_changes(
     });
 
     Some(ScopeRankChanges {
-        parent: if parent.is_empty() {
-            "/".to_string()
-        } else {
-            GardenItemUrl::from_storage_str(parent, room_wire).into_inner()
-        },
+        parent: GardenItemUrl::from_stored(parent, room_wire).into_inner(),
         changes,
     })
 }
@@ -473,8 +469,8 @@ async fn rpc_post(
         for s in &v.doc.statements {
             if let dsl::Stmt::Vote { item1, item2, .. } = s {
                 if let (Ok(a), Ok(b)) = (resolve_item(item1), resolve_item(item2)) {
-                    if let Some(p) = CanonicalItemUrl::parse(&a).and_then(|c| c.parent()) { parents.insert(p); }
-                    if let Some(p) = CanonicalItemUrl::parse(&b).and_then(|c| c.parent()) { parents.insert(p); }
+                    if let Some(p) = a.parent() { parents.insert(p); }
+                    if let Some(p) = b.parent() { parents.insert(p); }
                 }
             }
         }
@@ -525,7 +521,7 @@ async fn rpc_post(
             .filter_map(|p| {
                 let before = pre_rankings.get(p)?;
                 let after = crate::scope_rank::build_children_rankings(content, p);
-                compute_scope_rank_changes(p.as_str(), before, &after, &room_key)
+                compute_scope_rank_changes(p, before, &after, &room_key)
             })
             .collect();
         if v.is_empty() { None } else { Some(v) }
@@ -638,8 +634,8 @@ async fn rpc_check(
         for s in &v.doc.statements {
             if let dsl::Stmt::Vote { item1, item2, .. } = s {
                 if let (Ok(a), Ok(b)) = (resolve_item(item1), resolve_item(item2)) {
-                    if let Some(p) = CanonicalItemUrl::parse(&a).and_then(|c| c.parent()) { parents.insert(p); }
-                    if let Some(p) = CanonicalItemUrl::parse(&b).and_then(|c| c.parent()) { parents.insert(p); }
+                    if let Some(p) = a.parent() { parents.insert(p); }
+                    if let Some(p) = b.parent() { parents.insert(p); }
                 }
             }
         }
@@ -961,7 +957,7 @@ fn rpc_search(reduced: &ReducerState, q: &str, limit: usize, principal: Option<&
 async fn rpc_get_pair(state: &AppState, room: String, parent_path: String) -> Result<RpcResult, RpcErr> {
     let scope = scope_from_room_wire(&room);
     let reduced_arc = state.reduced.clone();
-    let pool: Vec<String> = {
+    let pool: Vec<CanonicalItemUrl> = {
         let reduced = reduced_arc.read().await;
         let content = content_for_room(&reduced, &room);
         let tmp = if parent_path.trim().is_empty() {
@@ -970,12 +966,11 @@ async fn rpc_get_pair(state: &AppState, room: String, parent_path: String) -> Re
             Some(parent_path.clone())
         };
         let specs = parse_parent_specs(tmp.as_ref());
-        let raw_pool: Vec<CanonicalItemUrl> = if specs.is_empty() {
+        if specs.is_empty() {
             content.ranking_group.idx_to_item.clone()
         } else {
             crate::scope_rank::resolve_scope(content, &specs)
-        };
-        raw_pool.into_iter().map(|it| it.0).collect()
+        }
     };
     if pool.len() < 2 {
         return Err((
@@ -983,31 +978,30 @@ async fn rpc_get_pair(state: &AppState, room: String, parent_path: String) -> Re
             Some("add items via ingest".into()),
         ));
     }
-    let selected: Option<(String, String)> = {
+    let selected: Option<(CanonicalItemUrl, CanonicalItemUrl)> = {
         let mut reduced = reduced_arc.write().await;
         let content = reduced.content.entry(scope.clone()).or_default();
         let group = &mut content.ranking_group;
         if group.idx_to_item.is_empty() {
-            pick_random_distinct(&pool)
+            pick_random_distinct_canonical(&pool)
         } else {
             let mut rng = rand::thread_rng();
-            let idxs: Vec<usize> = pool.iter()
-                .filter_map(|it| {
-                    let key = CanonicalItemUrl(it.clone());
-                    group.item_to_idx.get(&key).copied()
-                })
+            let idxs: Vec<usize> = pool
+                .iter()
+                .filter_map(|it| group.item_to_idx.get(it).copied())
                 .collect();
             let ranked = ranked_items_subset(group, &idxs, 10000, 1e-8);
-            let ranked_set: HashSet<String> = ranked.iter().map(|r| r.item.as_str().to_string()).collect();
-            let unsorted: Vec<String> = pool.iter()
+            let ranked_set: HashSet<CanonicalItemUrl> = ranked.iter().map(|r| r.item.clone()).collect();
+            let unsorted: Vec<CanonicalItemUrl> = pool
+                .iter()
                 .filter(|it| !ranked_set.contains(*it))
                 .cloned()
                 .collect();
-            let mut pick: Option<(String, String)> = None;
+            let mut pick: Option<(CanonicalItemUrl, CanonicalItemUrl)> = None;
             if !unsorted.is_empty() {
                 if let Some(left) = unsorted.choose(&mut rng).cloned() {
-                    let mut candidates: Vec<String> = if !ranked.is_empty() {
-                        ranked.iter().map(|r| r.item.as_str().to_string()).collect()
+                    let mut candidates: Vec<CanonicalItemUrl> = if !ranked.is_empty() {
+                        ranked.iter().map(|r| r.item.clone()).collect()
                     } else {
                         pool.clone()
                     };
@@ -1021,21 +1015,21 @@ async fn rpc_get_pair(state: &AppState, room: String, parent_path: String) -> Re
                     let a = ranked[i].item.as_str();
                     let b = ranked[i + 1].item.as_str();
                     if a != b && !is_pair_voted(group, a, b) {
-                        pick = Some((a.to_string(), b.to_string()));
+                        pick = Some((ranked[i].item.clone(), ranked[i + 1].item.clone()));
                         break;
                     }
                 }
                 if pick.is_none() {
                     for _ in 0..64 {
                         let (Some(a), Some(b)) = (pool.choose(&mut rng).cloned(), pool.choose(&mut rng).cloned()) else { break; };
-                        if a != b && !is_pair_voted(group, &a, &b) {
+                        if a != b && !is_pair_voted(group, a.as_str(), b.as_str()) {
                             pick = Some((a, b));
                             break;
                         }
                     }
                 }
             }
-            pick.or_else(|| pick_random_distinct(&pool))
+            pick.or_else(|| pick_random_distinct_canonical(&pool))
         }
     };
     let Some((left, right)) = selected else {
@@ -1043,8 +1037,8 @@ async fn rpc_get_pair(state: &AppState, room: String, parent_path: String) -> Re
     };
     let reduced = reduced_arc.read().await;
     let content = content_for_ro

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