reset value of searchable and displayed attributes; fix #473

meilisearch-core/src/update/settings_update.rs

@@ -84,8 +84,7 @@ pub fn apply_settings_update(
             must_reindex = true;
         },
         UpdateState::Clear => {
-            let clear: Vec<&str> = Vec::new();
+            schema.set_all_fields_indexed();
-            schema.update_indexed(clear)?;
             must_reindex = true;
         },
         UpdateState::Nothing => (),
@@ -93,8 +92,7 @@ pub fn apply_settings_update(
     match settings.displayed_attributes.clone() {
         UpdateState::Update(v) => schema.update_displayed(v)?,
         UpdateState::Clear => {
-            let clear: Vec<&str> = Vec::new();
+            schema.set_all_fields_displayed();
-            schema.update_displayed(clear)?;
         },
         UpdateState::Nothing => (),
     }

meilisearch-schema/src/fields_map.rs

@@ -1,4 +1,5 @@
 use std::collections::HashMap;
+use std::collections::hash_map::Iter;
 
 use serde::{Deserialize, Serialize};
 
@@ -45,7 +46,12 @@ impl FieldsMap {
     pub fn name<I: Into<FieldId>>(&self, id: I) -> Option<&str> {
         self.id_map.get(&id.into()).map(|s| s.as_str())
     }
+
+    pub fn iter(&self) -> Iter<'_, String, FieldId> {
+        self.name_map.iter()
     }
+}
+
 
 #[cfg(test)]
 mod tests {

meilisearch-schema/src/schema.rs

@@ -190,6 +190,25 @@ impl Schema {
         Ok(())
     }
 
+    pub fn set_all_fields_indexed(&mut self) {
+        self.indexed.clear();
+        self.indexed_map.clear();
+
+        for (_name, id) in self.fields_map.iter() {
+            let pos = self.indexed.len() as u16;
+            self.indexed.push(*id);
+            self.indexed_map.insert(*id, pos.into());
+        }
+    }
+
+    pub fn set_all_fields_displayed(&mut self) {
+        self.displayed.clear();
+
+        for (_name, id) in self.fields_map.iter() {
+            self.displayed.insert(*id);
+        }
+    }
+
     pub fn accept_new_fields(&self) -> bool {
         self.accept_new_fields
     }