Getting error when trying to encode message with Protobuf - ruby-on-rails

Question

Protobuf generated:
# source: event.proto
require 'google/protobuf'
Google::Protobuf::DescriptorPool.generated_pool.build do
add_file("event.proto", :syntax => :proto3) do
add_message "myapp.Event" do
optional :name, :string, 1
optional :entity, :enum, 2, "myapp.Event.Entity"
oneof :event_data do
optional :first_event_data, :message, 3, "myapp.Event.FirstEventData"
optional :second_event_data, :message, 4, "myapp.Event.SecondEventData"
end
end
add_message "myapp.Event.FirstEventData" do
optional :id, :string, 1
optional :to, :string, 2
optional :from, :string, 3
end
add_message "myapp.Event.SecondEventData" do
optional :metadata_url, :string, 1
end
add_enum "myapp.Event.Entity" do
value :FIRST, 0
value :SECOND, 1
end
end
end
module Myapp
Event = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("myapp.Event").msgclass
Event::FirstEventData = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("myapp.Event.FirstEventData").msgclass
Event::SecondEventData = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("myapp.Event.SecondEventData").msgclass
Event::Entity = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("myapp.Event.Entity").enummodule
end
Now in the console when I do
message = Myapp::Event.new(
entity: :SECOND,
name: "started",
event_data: {
second_event_data:
Myapp::Event::SecondEventData.new(
metadata_url: "local-dev-url",
)
}
)
I get this error:
Traceback (most recent call last):
3: from (irb):178
2: from (irb):178:in `new'
1: from (irb):178:in `initialize'
ArgumentError (Unknown field name 'event_data' in initialization map entry.)
I have tried different combinations and every time different error, I think I am organising my message incorrectly.
Any help would be appreciated greatly. Thanks

Answer 1

Well, after lots of research, apparently I can't do it all at once. I need to create 2 or 3 seperate objects:
i.e
message = Myapp::Event.new(
entity: :SECOND,
name: "started")
And then I can do this:
message.second_event_data = Myapp::Event::SecondEventData.new(
metadata_url: "local-dev-url",
)
Then when I encode it, second_event_data will sits under the event_data