add the possibility to totally clear the schema

meilisearch-core/src/store/main.rs

@@ -96,23 +96,23 @@ impl Main {
     }
 
     pub fn put_schema(self, writer: &mut heed::RwTxn<MainT>, schema: &Schema) -> ZResult<()> {
-        self.main
-            .put::<_, Str, SerdeBincode<Schema>>(writer, SCHEMA_KEY, schema)
+        self.main.put::<_, Str, SerdeBincode<Schema>>(writer, SCHEMA_KEY, schema)
     }
 
     pub fn schema(self, reader: &heed::RoTxn<MainT>) -> ZResult<Option<Schema>> {
-        self.main
-            .get::<_, Str, SerdeBincode<Schema>>(reader, SCHEMA_KEY)
+        self.main.get::<_, Str, SerdeBincode<Schema>>(reader, SCHEMA_KEY)
+    }
+
+    pub fn delete_schema(self, writer: &mut heed::RwTxn<MainT>) -> ZResult<bool> {
+        self.main.delete::<_, Str>(writer, SCHEMA_KEY)
     }
 
     pub fn put_ranked_map(self, writer: &mut heed::RwTxn<MainT>, ranked_map: &RankedMap) -> ZResult<()> {
-        self.main
-            .put::<_, Str, SerdeBincode<RankedMap>>(writer, RANKED_MAP_KEY, &ranked_map)
+        self.main.put::<_, Str, SerdeBincode<RankedMap>>(writer, RANKED_MAP_KEY, &ranked_map)
     }
 
     pub fn ranked_map(self, reader: &heed::RoTxn<MainT>) -> ZResult<Option<RankedMap>> {
-        self.main
-            .get::<_, Str, SerdeBincode<RankedMap>>(reader, RANKED_MAP_KEY)
+        self.main.get::<_, Str, SerdeBincode<RankedMap>>(reader, RANKED_MAP_KEY)
     }
 
     pub fn put_synonyms_fst(self, writer: &mut heed::RwTxn<MainT>, fst: &fst::Set) -> ZResult<()> {

meilisearch-core/src/update/settings_update.rs

@@ -63,10 +63,6 @@ pub fn apply_settings_update(
         _ => (),
     }
 
-    if let UpdateState::Update(id) = settings.attribute_identifier {
-         schema.set_identifier(id)?;
-    };
-
     match settings.attributes_searchable.clone() {
         UpdateState::Update(v) => schema.update_indexed(v)?,
         UpdateState::Clear => {
@@ -122,7 +118,18 @@ pub fn apply_settings_update(
         }
     };
 
-    index.main.put_schema(writer, &schema)?;
+    match settings.attribute_identifier.clone() {
+        UpdateState::Update(v) => {
+            schema.set_identifier(v)?;
+            index.main.put_schema(writer, &schema)?;
+        },
+        UpdateState::Clear => {
+            index.main.delete_schema(writer)?;
+        },
+        _ => {
+            index.main.put_schema(writer, &schema)?;
+        },
+    };
 
     match settings.stop_words {
         UpdateState::Update(stop_words) => {

meilisearch-http/tests/settings.rs

@@ -78,6 +78,8 @@ fn write_all_and_retreive() {
 
     block_on(sleep(Duration::from_secs(1)));
 
+    // 3 - Get all settings and compare to the previous one
+
     let req = http::Request::get("/indexes/movies/settings").body(Body::empty()).unwrap();
     let res = server.simulate(req).unwrap();
     assert_eq!(res.status(), 200);
@@ -86,8 +88,36 @@ fn write_all_and_retreive() {
     block_on(res.into_body().read_to_end(&mut buf)).unwrap();
     let res_value: Value = serde_json::from_slice(&buf).unwrap();
 
-    println!("json1: {:?}", json);
-    println!("json2: {:?}", res_value);
+    assert_json_eq!(json, res_value, ordered: false);
+
+    // 4 - Delete all settings
+
+    let req = http::Request::delete("/indexes/movies/settings").body(Body::empty()).unwrap();
+    let res = server.simulate(req).unwrap();
+    assert_eq!(res.status(), 202);
+
+    block_on(sleep(Duration::from_secs(1)));
+
+    // 5 - Get all settings and check if they are empty
+
+    let req = http::Request::get("/indexes/movies/settings").body(Body::empty()).unwrap();
+    let res = server.simulate(req).unwrap();
+    assert_eq!(res.status(), 200);
+
+    let mut buf = Vec::new();
+    block_on(res.into_body().read_to_end(&mut buf)).unwrap();
+    let res_value: Value = serde_json::from_slice(&buf).unwrap();
+
+    let json = json!({
+        "ranking_rules": null,
+        "ranking_distinct": null,
+        "attribute_identifier": null,
+        "attributes_searchable": null,
+        "attributes_displayed": null,
+        "attributes_ranked": null,
+        "stop_words": null,
+        "synonyms": null,
+    });
 
     assert_json_eq!(json, res_value, ordered: false);
 }