module Grape::Formatters::ActiveModelSerializers

def self.build_serializer_options(env)
  ams_options = env[:active_model_serializer_options] || {}
  # Add serialization context
  ams_options.fetch(:serialization_context) do
    request = env['grape.request']
    ams_options[:serialization_context] = ::ActiveModelSerializers::SerializationContext.new(
      request_url: request.url[/\A[^?]+/],
      query_parameters: request.params
    )
  end
  ams_options
end

def self.call(resource, env)
  serializer_options = build_serializer_options(env)
  ::ActiveModelSerializers::SerializableResource.new(resource, serializer_options).to_json
end