with_fields.rb

 class Logger < ::ActiveSupport::Logger
    def with_field(key, value)
      Thread.current['lograge.data'] ||= {}
      Thread.current['lograge.data'][key] = value
      return self
    end

    def with_fields(hash)
      if hash.is_a?(Hash)
        Thread.current['lograge.data'] ||= {}
        Thread.current['lograge.data'].merge!(hash)
      end
      return self
    end
    
    
    def with_local_fields(hash)
      if hash.is_a?(Hash)
        Thread.current[LOCAL_LOG_FIELDS] ||= {}
        Thread.current[LOCAL_LOG_FIELDS].merge!(hash)
      end
      yield(self) if block_given?
      return self
    end
  end