[Bugfix] Invalid generation of types with >1 generic parameters

codegen/src/types/composite_def.rs

@@ -173,7 +173,11 @@ impl CompositeDefFields {
         let mut unnamed_fields = Vec::new();
 
         for field in fields {
-            let type_path = type_gen.resolve_field_type_path(field.ty.id, parent_type_params);
+            let type_path = type_gen.resolve_field_type_path(
+                field.ty.id,
+                parent_type_params,
+                field.type_name.as_deref(),
+            );
             let field_type =
                 CompositeDefFieldType::new(field.ty.id, type_path, field.type_name.clone());
 

codegen/src/types/mod.rs

@@ -137,8 +137,9 @@ impl<'a> TypeGenerator<'a> {
         &self,
         id: u32,
         parent_type_params: &[TypeParameter],
+        original_name: Option<&str>,
     ) -> TypePath {
-        self.resolve_type_path_recurse(id, true, parent_type_params)
+        self.resolve_type_path_recurse(id, true, parent_type_params, original_name)
     }
 
     /// Get the type path for the given type identifier.
@@ -147,22 +148,25 @@ impl<'a> TypeGenerator<'a> {
     ///
     /// If no type with the given id found in the type registry.
     pub fn resolve_type_path(&self, id: u32) -> TypePath {
-        self.resolve_type_path_recurse(id, false, &[])
+        self.resolve_type_path_recurse(id, false, &[], None)
     }
 
     /// Visit each node in a possibly nested type definition to produce a type path.
     ///
     /// e.g `Result<GenericStruct<NestedGenericStruct<T>>, String>`
+    ///
+    /// if `original_name` is `Some(original_name)`, the resolved type needs to have the same `original_name`.
     fn resolve_type_path_recurse(
         &self,
         id: u32,
         is_field: bool,
         parent_type_params: &[TypeParameter],
+        original_name: Option<&str>,
     ) -> TypePath {
-        if let Some(parent_type_param) = parent_type_params
-            .iter()
-            .find(|tp| tp.concrete_type_id == id)
-        {
+        if let Some(parent_type_param) = parent_type_params.iter().find(|tp| {
+            tp.concrete_type_id == id
+                && original_name.map_or(true, |original_name| tp.original_name == original_name)
+        }) {
             return TypePath::from_parameter(parent_type_param.clone());
         }
 
@@ -181,7 +185,7 @@ impl<'a> TypeGenerator<'a> {
             .type_params
             .iter()
             .filter_map(|f| {
-                f.ty.map(|f| self.resolve_type_path_recurse(f.id, false, parent_type_params))
+                f.ty.map(|f| self.resolve_type_path_recurse(f.id, false, parent_type_params, None))
             })
             .collect();
 
@@ -205,27 +209,30 @@ impl<'a> TypeGenerator<'a> {
                     arr.type_param.id,
                     false,
                     parent_type_params,
+                    None,
                 )),
             },
             TypeDef::Sequence(seq) => TypePathType::Vec {
                 of: Box::new(self.resolve_type_path_recurse(
                     seq.type_param.id,
                     false,
                     parent_type_params,
+                    None,
                 )),
             },
             TypeDef::Tuple(tuple) => TypePathType::Tuple {
                 elements: tuple
                     .fields
                     .iter()
-                    .map(|f| self.resolve_type_path_recurse(f.id, false, parent_type_params))
+                    .map(|f| self.resolve_type_path_recurse(f.id, false, parent_type_params, None))
                     .collect(),
             },
             TypeDef::Compact(compact) => TypePathType::Compact {
                 inner: Box::new(self.resolve_type_path_recurse(
                     compact.type_param.id,
                     false,
                     parent_type_params,
+                    None,
                 )),
                 is_field,
                 crate_path: self.crate_path.clone(),
@@ -235,11 +242,13 @@ impl<'a> TypeGenerator<'a> {
                     bitseq.bit_order_type.id,
                     false,
                     parent_type_params,
+                    None,
                 )),
                 bit_store_type: Box::new(self.resolve_type_path_recurse(
                     bitseq.bit_store_type.id,
                     false,
                     parent_type_params,
+                    None,
                 )),
                 crate_path: self.crate_path.clone(),
             },

testing/integration-tests/src/codegen/codegen_tests.rs

@@ -6,8 +6,9 @@ use frame_metadata::{
     v15::{ExtrinsicMetadata, RuntimeMetadataV15},
     RuntimeMetadataPrefixed,
 };
-use scale_info::{meta_type, IntoPortable, TypeInfo};
+use scale_info::{meta_type, IntoPortable, PortableRegistry, Registry, TypeInfo};
 use subxt_codegen::{CratePath, DerivesRegistry, RuntimeGenerator, TypeSubstitutes};
+use syn::__private::quote;
 
 fn generate_runtime_interface_from_metadata(metadata: RuntimeMetadataPrefixed) -> String {
     // Generate a runtime interface from the provided metadata.
@@ -144,3 +145,75 @@ fn generic_types_overwrite_each_other() {
     // We do _not_ expect this to exist, since a generic is present on the type:
     assert!(!interface.contains("DuplicateType2"));
 }
+
+#[test]
+fn more_than_1_generic_parameters_work() {
+    #[allow(unused)]
+    #[derive(TypeInfo)]
+    struct Foo<T, U, V, W> {
+        a: T,
+        b: U,
+        c: V,
+        d: W,
+    }
+
+    #[allow(unused)]
+    #[derive(TypeInfo)]
+    struct Bar {
+        p: Foo<u32, u32, u64, u128>,
+        q: Foo<u8, u8, u8, u8>,
+    }
+
+    let mut registry = Registry::new();
+    registry.register_type(&meta_type::<Bar>());
+    let portable_types: PortableRegistry = registry.into();
+
+    let type_gen = subxt_codegen::TypeGenerator::new(
+        &portable_types,
+        "root",
+        Default::default(),
+        Default::default(),
+        CratePath::default(),
+        false,
+    );
+
+    let types = type_gen.generate_types_mod().unwrap();
+    let generated_mod = quote::quote!( #types);
+
+    let expected_mod = quote::quote! {
+    pub mod root {
+        use super::root;
+        pub mod integration_tests {
+            use super::root;
+            pub mod codegen {
+            use super::root;
+                pub mod codegen_tests {
+                        use super::root;
+                        pub struct Bar {
+                            pub p: root::integration_tests::codegen::codegen_tests::Foo<
+                                ::core::primitive::u32,
+                                ::core::primitive::u32,
+                                ::core::primitive::u64,
+                                ::core::primitive::u128
+                            >,
+                            pub q: root::integration_tests::codegen::codegen_tests::Foo<
+                                ::core::primitive::u8,
+                                ::core::primitive::u8,
+                                ::core::primitive::u8,
+                                ::core::primitive::u8
+                            >,
+                        }
+                        pub struct Foo<_0, _1, _2, _3> {
+                            pub a: _0,
+                            pub b: _1,
+                            pub c: _2,
+                            pub d: _3,
+                        }
+                    }
+                }
+            }
+        }
+    };
+
+    assert_eq!(generated_mod.to_string(), expected_mod.to_string());
+}