问未定义的方法“[]”表示零:典狱长的NilClass

EN

module V0
  module Api
    # @private
    module Helpers
      def warden
        env['warden']
      end

      # Used to require an authenticated user for a particular action.
      def protected!
        warden.authenticate!
      end

      def current_user
        warden.user
      end

      def parse_json_body
        request.body.rewind
        request_body = current_user ? current_user.keychain_replace(request.body.read) : request.body.read
        @parsed_body = JSON.parse(request_body, symbolize_names: true)
        params.update @parsed_body
      end
    end
  end
end

request_body = current_user ? current_user.keychain_replace(request.body.read) : request.body.read

NoMethodError:
       undefined method `[]' for nil:NilClass
     # (eval):2:in `method_missing'
     # ./app/api/v0/helpers.rb:11:in `warden'
     # ./app/api/v0/helpers.rb:23:in `current_user'
     # ./app/api/v0/helpers.rb:37:in `parse_json_body'

request_body = request.body.read