Serdes is a tool for serializing and deserializing class. It provides:

• general way to serialize and deserialize
• simple type checking for attributes
• basic implementation for some class to Hash.

bundle add serdes

If bundler is not being used to manage dependencies, install the gem by executing:

gem install serdes

require "serdes"

class User
  include Serdes

  rename_all_attributes :PascalCase

  attribute :name, String
  attribute :age, Integer
  attribute :profile, optional(String)
  attribute :tags, array(String)
  attribute :has_pet, Boolean
  attribute :plan, String, only: ["free", "premium"]
end

user_hash = {
  "Name" => "Alice",
  "Age" => 20,
  "HasPet" => true,
  "Tags" => ["tag1", "tag2"]
}

user = User.from(user_hash)

user_hash = {
  "Name" => "Alice",
  "Age" => 20,
  "HasPet" => true,
  "Tags" => ["tag1", "tag2"]
}

User.from(user_hash) # => raise Serdes::TypeError

• <class>.from(obj): Deserialize object to instance.
  • from will call from_<obj.class> method if it exists. if not, it returns obj as it is.
• <class>#to_hash: Serialize instance to Hash.
  • There is no support for serialization, as only you need to do is just implement to_<class> method where you want.

serdes provides some convenient types for type checking:

• optional(type): type | nil
• array: Array of type

• rename_all_attributes: Rename all attributes when serializing and deserializing.
  • Supported: :snake_case, :PascalCase
• symbolize_all_keys: Symbolize all keys when serializing and deserializing Hash, and vice versa.

You can also use macro for each attribute by specifying 3rd argument of attribute.

• only: Only allow given values.
• skip_serializing: Skip serializing attribute by setting truthy value. it will ignore skip_serializing_if, skip_serializing_if_nil when this set.
• skip_serializing_if: Skip serializing if given proc call returns true.
• skip_serializing_if_nil: alias of skip_serializing_if: ->(v) { v.nil? }. It will ignore skip_serializing_if when this set.

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/riseshia/serdes.

The gem is available as open source under the terms of the MIT License.