Draft implementation of filter support for /delete-by-batch route

meilisearch/src/routes/indexes/documents.rs

@@ -17,6 +17,7 @@ use meilisearch_types::error::{Code, ResponseError};
 use meilisearch_types::heed::RoTxn;
 use meilisearch_types::index_uid::IndexUid;
 use meilisearch_types::milli::update::IndexDocumentsMethod;
+use meilisearch_types::milli::InternalError;
 use meilisearch_types::star_or::OptionStarOrList;
 use meilisearch_types::tasks::KindWithContent;
 use meilisearch_types::{milli, Document, Index};
@@ -373,22 +374,96 @@ async fn document_addition(
     Ok(task.into())
 }
 
+#[derive(Debug, Deserialize)]
+#[serde(untagged)]
+pub enum DocumentDeletionQuery {
+    Ids(Vec<Value>),
+    Object { filter: Option<Value> },
+}
+
+/// Parses a Json encoded document id and validate it, returning a user error when it is one.
+/// FIXME: stolen from milli
+fn validate_document_id_value(document_id: Value) -> String {
+    match document_id {
+        Value::String(string) => match validate_document_id(&string) {
+            Some(s) if s.len() == string.len() => string,
+            Some(s) => s.to_string(),
+            None => panic!(),
+        },
+        Value::Number(number) if number.is_i64() => number.to_string(),
+        _content => panic!(),
+    }
+}
+
+/// FIXME: stolen from milli
+fn validate_document_id(document_id: &str) -> Option<&str> {
+    if !document_id.is_empty()
+        && document_id.chars().all(|c| matches!(c, 'a'..='z' | 'A'..='Z' | '0'..='9' | '-' | '_'))
+    {
+        Some(document_id)
+    } else {
+        None
+    }
+}
+
 pub async fn delete_documents(
     index_scheduler: GuardedData<ActionPolicy<{ actions::DOCUMENTS_DELETE }>, Data<IndexScheduler>>,
     index_uid: web::Path<String>,
-    body: web::Json<Vec<Value>>,
+    body: web::Json<DocumentDeletionQuery>,
     req: HttpRequest,
     analytics: web::Data<dyn Analytics>,
 ) -> Result<HttpResponse, ResponseError> {
     debug!("called with params: {:?}", body);
     let index_uid = IndexUid::try_from(index_uid.into_inner())?;
+    let index_uid = index_uid.into_inner();
 
     analytics.delete_documents(DocumentDeletionKind::PerBatch, &req);
 
-    let ids = body
-        .iter()
-        .map(|v| v.as_str().map(String::from).unwrap_or_else(|| v.to_string()))
-        .collect();
+    let ids = match body.into_inner() {
+        DocumentDeletionQuery::Ids(body) => body
+            .iter()
+            .map(|v| v.as_str().map(String::from).unwrap_or_else(|| v.to_string()))
+            .collect(),
+        DocumentDeletionQuery::Object { filter } => {
+            debug!("filter: {:?}", filter);
+
+            // FIXME: spawn_blocking
+            if let Some(ref filter) = filter {
+                if let Some(facets) = crate::search::parse_filter(filter)? {
+                    debug!("facets: {:?}", facets);
+
+                    let index = index_scheduler.index(&index_uid)?;
+                    let rtxn = index.read_txn()?;
+                    let filtered_candidates = facets.evaluate(&rtxn, &index)?;
+                    debug!("filtered_candidates.len(): {:?}", filtered_candidates.len());
+
+                    // FIXME: unwraps
+                    let primary_key = index.primary_key(&rtxn)?.unwrap();
+                    let primary_key = index.fields_ids_map(&rtxn)?.id(primary_key).unwrap();
+
+                    let documents = index.documents(&rtxn, filtered_candidates.into_iter())?;
+                    debug!("documents.len(): {:?}", documents.len());
+                    let documents: Vec<String> = documents
+                        .into_iter()
+                        .map(|(_, document)| {
+                            let value = document.get(primary_key).unwrap();
+                            let value: Value = serde_json::from_slice(value)
+                                .map_err(InternalError::SerdeJson)
+                                .unwrap();
+
+                            validate_document_id_value(value)
+                        })
+                        .collect();
+                    debug!("documents: {:?}", documents);
+                    documents
+                } else {
+                    vec![]
+                }
+            } else {
+                vec![]
+            }
+        }
+    };
 
     let task =
         KindWithContent::DocumentDeletion { index_uid: index_uid.to_string(), documents_ids: ids };

meilisearch/src/search.rs

@@ -745,7 +745,7 @@ fn format_value<A: AsRef<[u8]>>(
     }
 }
 
-fn parse_filter(facets: &Value) -> Result<Option<Filter>, MeilisearchHttpError> {
+pub fn parse_filter(facets: &Value) -> Result<Option<Filter>, MeilisearchHttpError> {
     match facets {
         Value::String(expr) => {
             let condition = Filter::from_str(expr)?;