https://github.com/ruby/ostruct

OpenStruct implementation
https://github.com/ruby/ostruct

ruby

Last synced: about 1 month ago
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OpenStruct implementation

• Host: GitHub
• URL: https://github.com/ruby/ostruct
• Owner: ruby
• License: bsd-2-clause
• Created: 2017-09-26T09:52:34.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2024-07-15T00:38:36.000Z (2 months ago)
• Last Synced: 2024-08-02T08:28:15.435Z (about 2 months ago)
• Topics: ruby
• Language: Ruby
• Homepage:
• Size: 176 KB
• Stars: 109
• Watchers: 31
• Forks: 27
• Open Issues: 12
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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README

        
# OpenStruct [![Version](https://badge.fury.io/rb/ostruct.svg)](https://badge.fury.io/rb/ostruct) [![Default Gem](https://img.shields.io/badge/stdgem-default-9c1260.svg)](https://stdgems.org/ostruct/) [![Test](https://github.com/ruby/ostruct/workflows/test/badge.svg)](https://github.com/ruby/ostruct/actions?query=workflow%3Atest)

An OpenStruct is a data structure, similar to a Hash, that allows the definition of arbitrary attributes with their accompanying values. This is accomplished by using Ruby's metaprogramming to define methods on the class itself.

## Installation

The `ostruct` library comes pre-packaged with Ruby. No installation is necessary.

## Usage

```ruby

  require "ostruct"

  person = OpenStruct.new

  person.name = "John Smith"

  person.age  = 70

  person.name      # => "John Smith"

  person.age       # => 70

  person.address   # => nil

```

An OpenStruct employs a Hash internally to store the attributes and values and can even be initialized with one:

```ruby

  australia = OpenStruct.new(:country => "Australia", :capital => "Canberra")

    # => #

```

Hash keys with spaces or characters that could normally not be used for method calls (e.g. ()[]*) will not be immediately available on the OpenStruct object as a method for retrieval or assignment, but can still be reached through the Object#send method.

```ruby

  measurements = OpenStruct.new("length (in inches)" => 24)

  measurements.send("length (in inches)")   # => 24

  message = OpenStruct.new(:queued? => true)

  message.queued?                           # => true

  message.send("queued?=", false)

  message.queued?                           # => false

```

Removing the presence of an attribute requires the execution of the delete_field method as setting the property value to +nil+ will not remove the attribute.

```ruby

  first_pet  = OpenStruct.new(:name => "Rowdy", :owner => "John Smith")

  second_pet = OpenStruct.new(:name => "Rowdy")

  first_pet.owner = nil

  first_pet                 # => #

  first_pet == second_pet   # => false

  first_pet.delete_field(:owner)

  first_pet                 # => #

  first_pet == second_pet   # => true

```

## Development

After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake test` 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 tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).

## Contributing

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

## License

The gem is available as open source under the terms of the [2-Clause BSD License](https://opensource.org/licenses/BSD-2-Clause).