Don't use Deserr for ExternalDocumentId, instead convert to error afterward

crates/meilisearch/src/routes/indexes/similar.rs

@@ -5,7 +5,7 @@ use index_scheduler::IndexScheduler;
 use meilisearch_types::deserr::query_params::Param;
 use meilisearch_types::deserr::{DeserrJsonError, DeserrQueryParamError};
 use meilisearch_types::error::deserr_codes::*;
-use meilisearch_types::error::{ErrorCode as _, ResponseError};
+use meilisearch_types::error::ResponseError;
 use meilisearch_types::index_uid::IndexUid;
 use meilisearch_types::keys::actions;
 use meilisearch_types::serde_cs::vec::CS;
@@ -111,7 +111,7 @@ pub async fn similar_get(
 ) -> Result<HttpResponse, ResponseError> {
     let index_uid = IndexUid::try_from(index_uid.into_inner())?;
 
-    let query = params.0.try_into()?;
+    let query = params.0.into();
 
     let mut aggregate = SimilarAggregator::<SimilarGET>::from_query(&query);
 
@@ -295,10 +295,8 @@ impl std::convert::TryFrom<String> for RankingScoreThresholdGet {
     }
 }
 
-impl TryFrom<SimilarQueryGet> for SimilarQuery {
-    type Error = ResponseError;
-
-    fn try_from(
+impl From<SimilarQueryGet> for SimilarQuery {
+    fn from(
         SimilarQueryGet {
             id,
             offset,
@@ -311,7 +309,7 @@ impl TryFrom<SimilarQueryGet> for SimilarQuery {
             embedder,
             ranking_score_threshold,
         }: SimilarQueryGet,
-    ) -> Result<Self, Self::Error> {
+    ) -> Self {
         let filter = match filter {
             Some(f) => match serde_json::from_str(&f) {
                 Ok(v) => Some(v),
@@ -320,10 +318,8 @@ impl TryFrom<SimilarQueryGet> for SimilarQuery {
             None => None,
         };
 
-        Ok(SimilarQuery {
-            id: id.0.try_into().map_err(|code: InvalidSimilarId| {
-                ResponseError::from_msg(code.to_string(), code.error_code())
-            })?,
+        SimilarQuery {
+            id: serde_json::Value::String(id.0),
             offset: offset.0,
             limit: limit.0,
             filter,
@@ -333,6 +329,6 @@ impl TryFrom<SimilarQueryGet> for SimilarQuery {
             show_ranking_score: show_ranking_score.0,
             show_ranking_score_details: show_ranking_score_details.0,
             ranking_score_threshold: ranking_score_threshold.map(|x| x.0),
-        })
+        }
     }
 }

crates/meilisearch/src/search/mod.rs

@@ -635,7 +635,7 @@ impl SearchQueryWithIndex {
 pub struct SimilarQuery {
     #[deserr(error = DeserrJsonError<InvalidSimilarId>)]
     #[schema(value_type = String)]
-    pub id: ExternalDocumentId,
+    pub id: serde_json::Value,
     #[deserr(default = DEFAULT_SEARCH_OFFSET(), error = DeserrJsonError<InvalidSimilarOffset>)]
     pub offset: usize,
     #[deserr(default = DEFAULT_SEARCH_LIMIT(), error = DeserrJsonError<InvalidSimilarLimit>)]
@@ -657,8 +657,7 @@ pub struct SimilarQuery {
     pub ranking_score_threshold: Option<RankingScoreThresholdSimilar>,
 }
 
-#[derive(Debug, Clone, PartialEq, Deserr)]
-#[deserr(try_from(Value) = TryFrom::try_from -> InvalidSimilarId)]
+#[derive(Debug, Clone, PartialEq)]
 pub struct ExternalDocumentId(String);
 
 impl AsRef<str> for ExternalDocumentId {
@@ -674,7 +673,7 @@ impl ExternalDocumentId {
 }
 
 impl TryFrom<String> for ExternalDocumentId {
-    type Error = InvalidSimilarId;
+    type Error = milli::UserError;
 
     fn try_from(value: String) -> Result<Self, Self::Error> {
         serde_json::Value::String(value).try_into()
@@ -682,10 +681,10 @@ impl TryFrom<String> for ExternalDocumentId {
 }
 
 impl TryFrom<Value> for ExternalDocumentId {
-    type Error = InvalidSimilarId;
+    type Error = milli::UserError;
 
     fn try_from(value: Value) -> Result<Self, Self::Error> {
-        Ok(Self(milli::documents::validate_document_id_value(value).map_err(|_| InvalidSimilarId)?))
+        Ok(Self(milli::documents::validate_document_id_value(value)?))
     }
 }
 
@@ -1597,6 +1596,11 @@ pub fn perform_similar(
         ranking_score_threshold,
     } = query;
 
+    let id: ExternalDocumentId = id.try_into().map_err(|error| {
+        let msg = format!("Invalid value at `.id`: {error}");
+        ResponseError::from_msg(msg, Code::InvalidSimilarId)
+    })?;
+
     // using let-else rather than `?` so that the borrow checker identifies we're always returning here,
     // preventing a use-after-move
     let Some(internal_id) = index.external_documents_ids().get(&rtxn, &id)? else {