A better version of Ruby's
Add this line to your application's Gemfile:
And then execute:
Or install it yourself as:
$ gem install compare_by
Suppose you have the following class:
class SomeClass attr_accessor :some_attr, :some_other_attr # ... end
To ensure the uniqueness of each instance of the class,
CompareBy module and specify which attribute(s)/method(s) you want the instances compared by.
require 'compare_by' class SomeClass include attr_accessor :some_attr, :some_other_attr compare_by :some_attr # ... end
If you then made two instances of
SomeClass with the same value of
some_attr, they would be considered equivalent.
instance1 = SomeClass.new instance1.some_attr = 'foo' instance2 = SomeClass.new instance2.some_attr = 'foo' instance1 == instance2 #=> true instance1.eql?(instance2) #=> true [instance1, instance2].uniq #=> [instance1]
Note that you can specify one or more attribute(s)/method(s) for instances to be compared by, and each will be considered in order.
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 tags, and push the
.gem file to rubygems.org.
Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/compare_by. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.
The gem is available as open source under the terms of the MIT License.