def self.apply option, members = {}
option.extend self
key_option = option.key_option
if key_descriptors = members[:key]
key_option = key_option.extend_with_config(*key_descriptors)
MetaUtils.extend_method(option, :key_option) { key_option }
end
value_option = option.value_option
if value_descriptors = members[:value]
value_option = value_option.extend_with_config(*value_descriptors)
MetaUtils.extend_method(option, :value_option) { value_option }
end
key_option.param_name = members[:key_param] if members[:key_param]
value_option.param_name = members[:value_param] if members[:value_param]
separator = members[:flattened] ? '.' : '.entry.'
MetaUtils.extend_method(option, :separator) { separator }
end