fix(grpc): schema validation for fields in snake_case

Cargo.toml

@@ -121,6 +121,7 @@ async-graphql = { version = "7.0.3", features = [
     "apollo_tracing",
     "opentelemetry",
 ]}
+convert_case = "0.6.0"
 
 [dev-dependencies]
 criterion = "0.5.1"

src/grpc/protobuf.rs

@@ -201,7 +201,7 @@ impl ProtobufOperation {
 }
 
 #[cfg(test)]
-mod tests {
+pub mod tests {
     // TODO: Rewrite protobuf tests
     use std::path::PathBuf;
 
@@ -232,7 +232,7 @@ mod tests {
         test_file
     }
 
-    async fn get_proto_file(name: &str) -> Result<FileDescriptorSet> {
+    pub async fn get_proto_file(name: &str) -> Result<FileDescriptorSet> {
         let runtime = crate::runtime::test::init(None);
         let reader = ConfigReader::init(runtime);
 

src/grpc/tests/proto/news.proto

@@ -8,7 +8,7 @@ message News {
     int32 id = 1;
     string title = 2;
     string body = 3;
-    string postImage = 4;
+    string post_image = 4;
 }
 
 service NewsService {

src/grpc/tests/proto/news_no_pkg.proto

@@ -6,7 +6,7 @@ message News {
   int32 id = 1;
   string title = 2;
   string body = 3;
-  string postImage = 4;
+  string post_image = 4;
 }
 
 service NewsService {

src/json/json_schema.rs

@@ -1,5 +1,6 @@
 use std::collections::HashMap;
 
+use convert_case::{Case, Casing};
 use prost_reflect::{FieldDescriptor, Kind, MessageDescriptor};
 use serde::{Deserialize, Serialize};
 
@@ -158,7 +159,10 @@ impl TryFrom<&MessageDescriptor> for JsonSchema {
         for field in fields {
             let field_schema = JsonSchema::try_from(&field)?;
 
-            map.insert(field.name().to_string(), field_schema);
+            // the snake_case for field names is automatically converted to camelCase
+            // by prost on serde serialize/deserealize and in graphql type name should be in
+            // camelCase as well, so convert field.name to camelCase here
+            map.insert(field.name().to_case(Case::Camel), field_schema);
         }
 
         Ok(JsonSchema::Obj(map))
@@ -210,9 +214,14 @@ impl TryFrom<&FieldDescriptor> for JsonSchema {
 
 #[cfg(test)]
 mod tests {
+    use std::collections::HashMap;
+
     use async_graphql::Name;
     use indexmap::IndexMap;
 
+    use crate::blueprint::GrpcMethod;
+    use crate::grpc::protobuf::tests::get_proto_file;
+    use crate::grpc::protobuf::ProtobufSet;
     use crate::json::JsonSchema;
     use crate::valid::{Valid, Validator};
 
@@ -274,4 +283,30 @@ mod tests {
         let result = schema.validate(&value);
         assert_eq!(result, Valid::succeed(()));
     }
+
+    #[tokio::test]
+    async fn test_from_protobuf_conversion() -> anyhow::Result<()> {
+        let grpc_method = GrpcMethod::try_from("news.NewsService.GetNews").unwrap();
+
+        let file = ProtobufSet::from_proto_file(&get_proto_file("news.proto").await?)?;
+        let service = file.find_service(&grpc_method)?;
+        let operation = service.find_operation(&grpc_method)?;
+
+        let schema = JsonSchema::try_from(&operation.output_type)?;
+
+        assert_eq!(
+            schema,
+            JsonSchema::Obj(HashMap::from_iter([
+                (
+                    "postImage".to_owned(),
+                    JsonSchema::Opt(JsonSchema::Str.into())
+                ),
+                ("title".to_owned(), JsonSchema::Opt(JsonSchema::Str.into())),
+                ("id".to_owned(), JsonSchema::Opt(JsonSchema::Num.into())),
+                ("body".to_owned(), JsonSchema::Opt(JsonSchema::Str.into())),
+            ]))
+        );
+
+        Ok(())
+    }
 }