new feature flag that will allow to opt-out @fetchable types from the…

… `node` query generation in @refetchable

Reviewed By: tyao1

Differential Revision: D58039454

fbshipit-source-id: 60fe22bf44fcafe767515387de6983d5e2b93546

compiler/crates/common/src/feature_flags.rs

@@ -113,6 +113,11 @@ pub struct FeatureFlags {
     /// in the schema.
     #[serde(default)]
     pub disallow_required_on_non_null_fields: bool,
+
+    /// Feature flag to prefer `fetch_MyType()` generatior over `node()` query generator
+    /// in @refetchable transform
+    #[serde(default)]
+    pub prefer_fetchable_in_refetch_queries: bool,
 }
 
 fn default_as_true() -> bool {

compiler/crates/relay-transforms/src/apply_transforms.rs

@@ -184,12 +184,7 @@ fn apply_common_transforms(
         transform_subscriptions(&program)
     })?;
     program = log_event.time("transform_refetchable_fragment", || {
-        transform_refetchable_fragment(
-            &program,
-            &project_config.schema_config,
-            &base_fragment_names,
-            false,
-        )
+        transform_refetchable_fragment(&program, project_config, &base_fragment_names, false)
     })?;
 
     program = log_event.time("relay_actor_change_transform", || {
@@ -734,12 +729,7 @@ fn apply_typegen_transforms(
     })?;
     log_event.time("flatten", || flatten(&mut program, false, false))?;
     program = log_event.time("transform_refetchable_fragment", || {
-        transform_refetchable_fragment(
-            &program,
-            &project_config.schema_config,
-            &base_fragment_names,
-            true,
-        )
+        transform_refetchable_fragment(&program, project_config, &base_fragment_names, true)
     })?;
     program = log_event.time("remove_base_fragments", || {
         remove_base_fragments(&program, &base_fragment_names)

compiler/crates/relay-transforms/src/client_edges.rs

@@ -268,8 +268,7 @@ impl<'program, 'pc> ClientEdgesTransform<'program, 'pc> {
             selections,
         };
 
-        let mut transformer =
-            RefetchableFragment::new(self.program, &self.project_config.schema_config, false);
+        let mut transformer = RefetchableFragment::new(self.program, self.project_config, false);
 
         let refetchable_fragment = transformer
             .transform_refetch_fragment_with_refetchable_directive(

compiler/crates/relay-transforms/src/refetchable_fragment.rs

@@ -35,6 +35,7 @@ use graphql_syntax::OperationKind;
 use intern::string_key::StringKeyMap;
 use node_query_generator::NODE_QUERY_GENERATOR;
 use query_query_generator::QUERY_QUERY_GENERATOR;
+use relay_config::ProjectConfig;
 use relay_config::SchemaConfig;
 use schema::SDLSchema;
 use schema::Schema;
@@ -70,13 +71,13 @@ use crate::root_variables::VariableMap;
 ///    Fragment to Root IR nodes.
 pub fn transform_refetchable_fragment(
     program: &Program,
-    schema_config: &SchemaConfig,
+    project_config: &ProjectConfig,
     base_fragment_names: &'_ FragmentDefinitionNameSet,
     for_typegen: bool,
 ) -> DiagnosticsResult<Program> {
     let mut next_program = Program::new(Arc::clone(&program.schema));
 
-    let mut transformer = RefetchableFragment::new(program, schema_config, for_typegen);
+    let mut transformer = RefetchableFragment::new(program, project_config, for_typegen);
 
     for operation in program.operations() {
         next_program.insert_operation(Arc::clone(operation));
@@ -113,26 +114,26 @@ pub fn transform_refetchable_fragment(
 
 type ExistingRefetchOperations = StringKeyMap<WithLocation<FragmentDefinitionName>>;
 
-pub struct RefetchableFragment<'program, 'sc> {
+pub struct RefetchableFragment<'program, 'pc> {
     connection_constants: ConnectionConstants,
     existing_refetch_operations: ExistingRefetchOperations,
     for_typegen: bool,
     program: &'program Program,
-    schema_config: &'sc SchemaConfig,
+    project_config: &'pc ProjectConfig,
 }
 
-impl<'program, 'sc> RefetchableFragment<'program, 'sc> {
+impl<'program, 'pc> RefetchableFragment<'program, 'pc> {
     pub fn new(
         program: &'program Program,
-        schema_config: &'sc SchemaConfig,
+        project_config: &'pc ProjectConfig,
         for_typegen: bool,
     ) -> Self {
         RefetchableFragment {
             connection_constants: Default::default(),
             existing_refetch_operations: Default::default(),
             for_typegen,
             program,
-            schema_config,
+            project_config,
         }
     }
 
@@ -170,10 +171,12 @@ impl<'program, 'sc> RefetchableFragment<'program, 'sc> {
         let variables_map =
             InferVariablesVisitor::new(self.program).infer_fragment_variables(fragment);
 
-        for generator in GENERATORS.iter() {
+        let generators = get_query_generators(self.project_config);
+
+        for generator in generators {
             if let Some(refetch_root) = (generator.build_refetch_operation)(
                 &self.program.schema,
-                self.schema_config,
+                &self.project_config.schema_config,
                 fragment,
                 refetchable_directive.query_name.item,
                 &variables_map,
@@ -185,7 +188,7 @@ impl<'program, 'sc> RefetchableFragment<'program, 'sc> {
             }
         }
         let mut descriptions = String::new();
-        for generator in GENERATORS.iter() {
+        for generator in generators.iter() {
             writeln!(descriptions, " - {}", generator.description).unwrap();
         }
         descriptions.pop();
@@ -367,6 +370,24 @@ const GENERATORS: [QueryGenerator; 4] = [
     FETCHABLE_QUERY_GENERATOR,
 ];
 
+const PREFER_FETCHABLE_GENERATORS: [QueryGenerator; 4] = [
+    VIEWER_QUERY_GENERATOR,
+    QUERY_QUERY_GENERATOR,
+    FETCHABLE_QUERY_GENERATOR,
+    NODE_QUERY_GENERATOR,
+];
+
+fn get_query_generators(project_config: &ProjectConfig) -> &'static [QueryGenerator; 4] {
+    if project_config
+        .feature_flags
+        .prefer_fetchable_in_refetch_queries
+    {
+        &PREFER_FETCHABLE_GENERATORS
+    } else {
+        &GENERATORS
+    }
+}
+
 pub struct RefetchRoot {
     pub fragment: Arc<FragmentDefinition>,
     pub selections: Vec<Selection>,

compiler/crates/relay-transforms/src/refetchable_fragment/node_query_generator.rs

@@ -53,7 +53,6 @@ fn build_refetch_operation(
     variables_map: &VariableMap,
 ) -> DiagnosticsResult<Option<RefetchRoot>> {
     let id_name = schema_config.node_interface_id_field;
-
     let node_interface_id = schema.get_type(CONSTANTS.node_type_name).and_then(|type_| {
         if let Type::Interface(id) = type_ {
             Some(id)