Keep '_' in attribute name in generated code

[nilsreichardt]

Description

If you have an underscore (_) as an attribute name, then it will be transformed into camel case. I didn't except this.

Steps to reproduce

syntax = "proto3";

message Notification {
    map<string, string> fcm_token = 1;
    bool receive_notifications = 2;
}

will be generated into

// @@START_GENERATED_FUNCTIONS@@
function isNotificationMessage(resource) {
  return resource.keys().hasAll([]) &&
          (resource.keys().hasOnly(['receiveNotifications','fcmToken'])) &&
          ((!resource.keys().hasAny(['fcmToken'])) || (resource.fcmToken is map)) &&
          ((!resource.keys().hasAny(['receiveNotifications'])) || (resource.receiveNotifications is bool));
}
// @@END_GENERATED_FUNCTIONS@@

Is there a way to keep the _ in the attribute name? My excepted out is:

// @@START_GENERATED_FUNCTIONS@@
function isNotificationMessage(resource) {
  return resource.keys().hasAll([]) &&
          (resource.keys().hasOnly(['receive_notifications','fcm_token'])) &&
          ((!resource.keys().hasAny(['fcm_token'])) || (resource.fcm_token is map)) &&
          ((!resource.keys().hasAny(['receive_notifications'])) || (resource.receive_notifications is bool));
}
// @@END_GENERATED_FUNCTIONS@@

[rockwotj]

There is a way to do this, right now we use the proto3 json mapping to get the names. You'd have to add an option to support keeping the original names around.

[nilsreichardt]

Ok, nice. What option is this exactly and how to use it?

[rockwotj]

Sorry I wasn't clear this is pretty straightforward to do, you have to change the code that looks at json_name and replace it with name in the places where it's used via a file option. There are existing examples of file options and here is one place we assume json naming

protobuf-rules-gen/firebase_rules_generator/generator.cc

Line 98 in d413219

required.push_back(field->json_name());

[samtstern]

@rockwotj thanks for chiming in here!