{"record":{"id":"bf757424cf82d6bc","repo":"GitoxideLabs/gitoxide","slug":"change-id-prefix-is-ambiguous-in-the-default-ti","errorCode":null,"errorMessage":"change ID prefix {} is ambiguous in the default Tix view","messagePattern":"change ID prefix (.+?) is ambiguous in the default Tix view","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"gix-tix/src/change_id.rs","lineNumber":82,"sourceCode":"    pub ambiguous: HashSet<ObjectId>,\n}\n\npub(crate) fn resolve_prefix(\n    repo: &gix::Repository,\n    prefix: &str,\n    ids: impl IntoIterator<Item = ObjectId>,\n) -> Result<Option<ObjectId>> {\n    let Ok(prefix) = gix::hash::Prefix::from_reverse_hex(prefix) else {\n        return Ok(None);\n    };\n    let mut found = None;\n    for id in ids {\n        let change_id = for_commit(repo, id)?;\n        if prefix.cmp_oid(&change_id) != CmpOrdering::Equal {\n            continue;\n        }\n        if found.replace(id).is_some() {\n            anyhow::bail!(\n                \"change ID prefix {} is ambiguous in the default Tix view\",\n                prefix.to_reverse_hex()\n            );\n        }\n    }\n    Ok(found)\n}\n\nfn collect_abbreviations(values: impl IntoIterator<Item = (ObjectId, ChangeId)>, len: usize) -> Abbreviations {\n    let mut by_prefix = HashMap::new();\n    let mut all = HashMap::new();\n    let mut ambiguous = HashSet::new();\n    for (id, change_id) in values {\n        let prefix = change_id.to_reverse_hex_with_len(len).to_string();\n        if let Some(first) = by_prefix.insert(prefix, id) {\n            ambiguous.insert(first);\n            ambiguous.insert(id);\n        }","sourceCodeStart":64,"sourceCodeEnd":100,"githubUrl":"https://github.com/GitoxideLabs/gitoxide/blob/e73179060badf27222d790981fac3f84c1830a7e/gix-tix/src/change_id.rs#L64-L100","documentation":"`gix_tix::change_id::resolve_prefix` resolves a change-ID prefix to exactly one commit in the default Tix view. If the prefix matches change IDs on more than one commit, the second match trips `found.replace(id).is_some()` and it bails, because an ambiguous prefix cannot identify a single change. Use a longer prefix to disambiguate.","triggerScenarios":"Calling `resolve_prefix(repo, prefix)` where at least two commits in the default Tix view have change IDs sharing the given prefix — e.g. passing a 1–3 character reverse-hex prefix in a repo with many changes.","commonSituations":"Typing short change-ID abbreviations by hand in `gix tix` commands; scripted lookups with fixed short prefixes that became ambiguous as the repository grew; repositories where many commits were created in one batch so prefixes collide early.","solutions":["Provide a longer change-ID prefix that uniquely identifies one commit.","Use the full change ID copied from the todo/history view.","List matching commits first (search the view by prefix) and pick the intended one explicitly.","Adjust the script to catch ambiguity and retry with a longer prefix."],"exampleFix":"// before\nlet id = resolve_prefix(repo, &\"ab\".parse()?)?;\n// after\nlet id = resolve_prefix(repo, &\"ab12ef\".parse()?)?; // longer, unambiguous prefix","handlingStrategy":"try-catch","validationCode":"// Ensure the prefix is long enough: check how many commits' change ids start with it before resolving.","typeGuard":null,"tryCatchPattern":"match resolve_prefix(repo, &prefix) { Err(e) if e.to_string().contains(\"is ambiguous\") => { let longer = extend_prefix(&prefix); resolve_prefix(repo, &longer) } other => other }","preventionTips":["Use full change IDs in scripts; reserve short prefixes for interactive use.","On ambiguity, retry automatically with progressively longer prefixes.","Avoid hardcoding 2-3 character prefixes in automation."],"tags":["git","change-id","ambiguity","prefix","tix"],"backgroundTag":"ambiguous-identifier","analyzedSha":"e73179060badf27222d790981fac3f84c1830a7e","analyzedAt":"2026-09-08T11:26:50.865Z","contentChangedAt":"2026-09-08T11:26:50.865Z","schemaVersion":2},"datasetVersion":"2026-09-15T23:17:13.987Z"}