Add default deserialize value

crates/meilisearch/tests/settings/get_settings.rs

@@ -523,7 +523,12 @@ async fn granular_filterable_attributes() {
         index.update_settings(json!({ "filterableAttributes": [
             { "attributePatterns": ["name"], "features": { "facetSearch": true, "filter": {"equality": true, "comparison": false} } },
             { "attributePatterns": ["age"], "features": { "facetSearch": false, "filter": {"equality": true, "comparison": true} } },
-            { "attributePatterns": ["id"] }
+            { "attributePatterns": ["id"] },
+            { "attributePatterns": ["default-filterable-features-null"], "features": { "facetSearch": true } },
+            { "attributePatterns": ["default-filterable-features-equality"], "features": { "facetSearch": true, "filter": {"comparison": true} } },
+            { "attributePatterns": ["default-filterable-features-comparison"], "features": { "facetSearch": true, "filter": {"equality": true} } },
+            { "attributePatterns": ["default-filterable-features-empty"], "features": { "facetSearch": true, "filter": {} } },
+            { "attributePatterns": ["default-facet-search"], "features": { "filter": {"equality": true, "comparison": true} } },
         ] })).await;
     assert_eq!(code, 202);
     index.wait_task(response.uid()).await.succeeded();
@@ -567,6 +572,66 @@ async fn granular_filterable_attributes() {
             "comparison": false
           }
         }
+      },
+      {
+        "attributePatterns": [
+          "default-filterable-features-null"
+        ],
+        "features": {
+          "facetSearch": true,
+          "filter": {
+            "equality": true,
+            "comparison": false
+          }
+        }
+      },
+      {
+        "attributePatterns": [
+          "default-filterable-features-equality"
+        ],
+        "features": {
+          "facetSearch": true,
+          "filter": {
+            "equality": true,
+            "comparison": true
+          }
+        }
+      },
+      {
+        "attributePatterns": [
+          "default-filterable-features-comparison"
+        ],
+        "features": {
+          "facetSearch": true,
+          "filter": {
+            "equality": true,
+            "comparison": false
+          }
+        }
+      },
+      {
+        "attributePatterns": [
+          "default-filterable-features-empty"
+        ],
+        "features": {
+          "facetSearch": true,
+          "filter": {
+            "equality": true,
+            "comparison": false
+          }
+        }
+      },
+      {
+        "attributePatterns": [
+          "default-facet-search"
+        ],
+        "features": {
+          "facetSearch": false,
+          "filter": {
+            "equality": true,
+            "comparison": true
+          }
+        }
       }
     ]
     "###);

crates/milli/src/filterable_attributes_rules.rs

@@ -71,7 +71,11 @@ impl FilterableAttributesPatterns {
 #[deserr(rename_all = camelCase, deny_unknown_fields)]
 #[derive(Default)]
 pub struct FilterableAttributesFeatures {
+    #[serde(default)]
+    #[deserr(default)]
     facet_search: bool,
+    #[serde(default)]
+    #[deserr(default)]
     filter: FilterFeatures,
 }
 
@@ -144,11 +148,21 @@ impl<E: DeserializeError> Deserr<E> for FilterableAttributesRule {
 }
 
 #[derive(Serialize, Deserialize, PartialEq, Eq, Clone, Copy, Debug, Deserr, ToSchema)]
+#[serde(deny_unknown_fields, rename_all = "camelCase")]
+#[deserr(rename_all = camelCase, deny_unknown_fields)]
 pub struct FilterFeatures {
+    #[serde(default = "default_true")]
+    #[deserr(default = true)]
     equality: bool,
+    #[serde(default)]
+    #[deserr(default)]
     comparison: bool,
 }
 
+fn default_true() -> bool {
+    true
+}
+
 impl FilterFeatures {
     /// Get the allowed operators for the filter.
     pub fn allowed_operators(&self) -> Vec<String> {