how to change output of a single attribute? about shale

[kgiszczak]

hey, you can achieve that using just plain Ruby, no need for special constructs:

class User < Shale::Mapper
  attribute :gender, Shale::Type::String

  def gender
    if super == 'f'
      'female'
    else
      'male'
    end
  end
end

although this behavior is confusing, the JSON doc you generate will be different then the one you're consuming (unless that's what you specifically need):

puts User.from_json('{"gender":"m"}').to_json
# => {"gender":"male"}

The proper way to solve this imo is to use custom type:

class Gender < Shale::Type::Value
  def self.of_json(value, **)
    value == 'm' ? 'male' : 'female'
  end

  def self.as_json(value, **)
    value == 'male' ? 'm' : 'f'
  end
end

class User < Shale::Mapper
  attribute :gender, Gender
end

This works as you would expect:

user = User.from_json('{"gender":"m"}')

puts user.gender
# => male

puts user.to_json
# => {"gender":"m"}

[glaucocustodio]

Since I'm only parsing a json and not to converting to it back, I am gonna override the method like you showed:

class User < Shale::Mapper
  attribute :gender, Shale::Type::String

  def gender
    if super == 'f'
      'female'
    else
      'male'
    end
  end
end

Would you accept a PR describing this behaviour with its caveat on README?

[kgiszczak]

having that in README would be a great addition, PR is welcome