https://github.com/matthewrudy/memoist

ActiveSupport::Memoizable with a few enhancements
https://github.com/matthewrudy/memoist

Keywords from Contributors

activejob activerecord mvc rubygems rspec static-code-analysis code-formatter rubocop rack omniauth

Last synced: about 23 hours ago
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Repository metadata

ActiveSupport::Memoizable with a few enhancements

Host: GitHub
URL: https://github.com/matthewrudy/memoist
Owner: matthewrudy
License: mit
Created: 2011-12-07T04:20:35.000Z (over 14 years ago)
Default Branch: master
Last Pushed: 2024-04-30T18:32:03.000Z (almost 2 years ago)
Last Synced: 2026-01-04T07:56:54.323Z (2 months ago)
Language: Ruby
Homepage:
Size: 106 KB
Stars: 925
Watchers: 20
Forks: 99
Open Issues: 28
Releases: 14
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE.md

Memoist

Memoist is an extraction of ActiveSupport::Memoizable.

Since June 2011 ActiveSupport::Memoizable has been deprecated.
But I love it,
and so I plan to keep it alive.

Usage

Just extend with the Memoist module

require 'memoist'
class Person
  extend Memoist

  def social_security
    puts "execute!"
    decrypt_social_security
  end
  memoize :social_security
end

person = Person.new

person.social_security
# execute!
# => (returns decrypt_social_security)

person.social_security
# => (returns the memoized value)

And person.social_security will only be calculated once.

Every memoized function (which initially was not accepting any arguments) has a (reload)
argument you can pass in to bypass and reset the memoization:

def some_method
  Time.now
end
memoize :some_method

Calling some_method will be memoized, but calling some_method(true) will rememoize each time.

You can even memoize method that takes arguments.

class Person
  def taxes_due(income)
    income * 0.40
  end
  memoize :taxes_due
end

This will only be calculated once per value of income.

You can also memoize class methods.

class Person

  class << self
    extend Memoist
    def with_overdue_taxes
      # ...
    end
    memoize :with_overdue_taxes
  end

end

When a sub-class overrides one of its parent's methods and you need to memoize both.
Then you can use the :identifier parameter in order to help Memoist distinguish between the two.

class Clock
  extend Memoist
  def now
     "The time now is #{Time.now.hour} o'clock and #{Time.now.min} minutes"
  end
  memoize :now
end

class AccurateClock < Clock
  extend Memoist
  def now
    "#{super} and #{Time.now.sec} seconds"
  end
  memoize :now, :identifier => :accurate_clock
end

Reload

Each memoized function comes with a way to flush the existing value.

person.social_security       # returns the memoized value
person.social_security(true) # bypasses the memoized value and rememoizes it

This also works with a memoized method with arguments

person.taxes_due(100_000)       # returns the memoized value
person.taxes_due(100_000, true) # bypasses the memoized value and rememoizes it

If you want to flush the entire memoization cache for an object

person.flush_cache   # returns an array of flushed memoized methods, e.g. ["social_security", "some_method"]

Authors

Everyone who contributed to it in the rails repository.

Joshua Peek
Tarmo Tänav
Jeremy Kemper
Eugene Pimenov
Xavier Noria
Niels Ganser
Carl Lerche & Yehuda Katz
jeem
Jay Pignata
Damien Mathieu
José Valim
Matthew Rudy Jacobs

Contributing

Fork it ( https://github.com/matthewrudy/memoist/fork )
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create new Pull Request

License

Released under the MIT License, just as Ruby on Rails is.

Owner metadata

Name: Matthew Rudy Jacobs
Login: matthewrudy
Email:
Kind: user
Description: Technical Architect @ministryofjustice, former Architect @GoGoVan, Organiser of @hkcodeconf and @codeaholicshk. Mandarin (and semi-Cantonese) speaker
Website: https://matthewrudy.com
Location: London / Hong Kong
Twitter:
Company: GoGoVan
Icon url: https://avatars.githubusercontent.com/u/8659?v=4
Repositories: 160
Last ynced at: 2023-04-09T04:55:30.119Z
Profile URL: https://github.com/matthewrudy

GitHub Events

Total

Fork event: 1
Watch event: 9
Issue comment event: 1

Last Year

Fork event: 1
Watch event: 2
Issue comment event: 1

Committers metadata

Last synced: 8 days ago

Total Commits: 105
Total Committers: 20
Avg Commits per committer: 5.25
Development Distribution Score (DDS): 0.419

Commits in past year: 0
Committers in past year: 0
Avg Commits per committer in past year: 0.0
Development Distribution Score (DDS) in past year: 0.0

Name	Email	Commits
Matthew Rudy Jacobs	M**s@g**m	61
Joe Rafaniello	j**e@r**m	12
Seb Jacobs	me@s****m	9
Peter Boling	p**g@g**m	3
Zach Hale	z**e@g**m	3
Igor Zubkov	i**v@g**m	2
Joshua Pinter	j**r@g**m	2
Brady Love and Johnneylee Jack Rollins	b**y@a**t	1
Gregory Perry	g**g@d**m	1
kota.nomura	k**a@a**p	1
Andrey Chernih	a**h@g**m	1
Brandon Zylstra	b**a@g**m	1
Faraz Yashar	f**r@g**m	1
Jean Boussier	j**r@g**m	1
Joe Burns	j**s@g**m	1
Matias Korhonen	k**t@g**m	1
Olivier Lacan	hi@o****m	1
PikachuEXE	p**e@g**m	1
Yusuke Nakamura	y**5@g**m	1
fervic	r**o@r**m	1

Committer domains:

Issue and Pull Request metadata

Last synced: 3 months ago

Total issues: 43
Total pull requests: 54
Average time to close issues: 3 months
Average time to close pull requests: 19 days
Total issue authors: 38
Total pull request authors: 36
Average comments per issue: 4.05
Average comments per pull request: 2.04
Merged pull request: 30
Bot issues: 0
Bot pull requests: 0

Past year issues: 0
Past year pull requests: 0
Past year average time to close issues: N/A
Past year average time to close pull requests: N/A
Past year issue authors: 0
Past year pull request authors: 0
Past year average comments per issue: 0
Past year average comments per pull request: 0
Past year merged pull request: 0
Past year bot issues: 0
Past year bot pull requests: 0

More stats: https://issues.ecosyste.ms/repositories/lookup?url=https://github.com/matthewrudy/memoist

Top Issue Authors

JacobEvelyn (5)
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Top Pull Request Authors

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Top Issue Labels

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breaks tests (1)

Package metadata

Total packages: 13
Total downloads:
- rubygems: 613,936,930 total
Total docker downloads: 1,162,376,186
Total dependent packages: 187 (may contain duplicates)
Total dependent repositories: 35,257 (may contain duplicates)
Total versions: 51
Total maintainers: 2

gem.coop: memoist

memoize methods invocation

Homepage: https://github.com/matthewrudy/memoist
Documentation: http://www.rubydoc.info/gems/memoist/
Licenses: MIT
Latest release: 0.16.2 (published over 6 years ago)
Last Synced: 2026-03-07T22:31:16.612Z (3 days ago)
Versions: 15
Dependent Packages: 0
Dependent Repositories: 0
Downloads: 306,972,578 Total
Docker Downloads: 581,188,093
Rankings:
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- Average: 0.059%
- Downloads: 0.079%
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Maintainers (2)
- matthewrudy
- Sebjacobs

ubuntu-22.04: ruby-memoist

Homepage: https://github.com/matthewrudy/memoist
Licenses: mit
Latest release: 0.16.2-2 (published 25 days ago)
Last Synced: 2026-02-13T13:20:19.053Z (25 days ago)
Versions: 1
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rubygems.org: memoist

memoize methods invocation

Homepage: https://github.com/matthewrudy/memoist
Documentation: http://www.rubydoc.info/gems/memoist/
Licenses: MIT
Latest release: 0.16.2 (published over 6 years ago)
Last Synced: 2026-03-07T13:30:33.067Z (3 days ago)
Versions: 15
Dependent Packages: 187
Dependent Repositories: 35,257
Downloads: 306,964,352 Total
Docker Downloads: 581,188,093
Rankings:
- Downloads: 0.065%
- Dependent repos count: 0.176%
- Dependent packages count: 0.2%
- Docker downloads count: 0.222%
- Average: 0.878%
- Stargazers count: 1.964%
- Forks count: 2.642%
Maintainers (2)
- matthewrudy
- Sebjacobs

proxy.golang.org: github.com/matthewrudy/memoist

Homepage:
Documentation: https://pkg.go.dev/github.com/matthewrudy/memoist#section-documentation
Licenses: mit
Latest release: v0.16.2 (published over 6 years ago)
Last Synced: 2026-03-06T16:00:37.159Z (4 days ago)
Versions: 11
Dependent Packages: 0
Dependent Repositories: 0
Rankings:
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- Forks count: 2.574%
- Average: 6.263%
- Dependent packages count: 9.576%
- Dependent repos count: 10.802%

debian-11: ruby-memoist

Homepage: https://github.com/matthewrudy/memoist
Documentation: https://packages.debian.org/bullseye/ruby-memoist
Licenses:
Latest release: 0.16.2-2 (published 28 days ago)
Last Synced: 2026-02-13T08:22:04.315Z (25 days ago)
Versions: 1
Dependent Packages: 0
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- Average: 100%

ubuntu-20.04: ruby-memoist

Homepage: https://github.com/matthewrudy/memoist
Licenses:
Latest release: 0.16.2-2 (published 25 days ago)
Last Synced: 2026-02-13T07:17:32.602Z (25 days ago)
Versions: 1
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ubuntu-23.10: ruby-memoist

Homepage: https://github.com/matthewrudy/memoist
Licenses:
Latest release: 0.16.2-3 (published 25 days ago)
Last Synced: 2026-02-13T18:25:25.753Z (25 days ago)
Versions: 1
Dependent Packages: 0
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Rankings:
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- Average: 100%

debian-10: ruby-memoist

Homepage: https://github.com/matthewrudy/memoist
Documentation: https://packages.debian.org/buster/ruby-memoist
Licenses:
Latest release: 0.16.0-2 (published 27 days ago)
Last Synced: 2026-02-13T04:22:52.203Z (26 days ago)
Versions: 1
Dependent Packages: 0
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- Average: 100%

ubuntu-23.04: ruby-memoist

Homepage: https://github.com/matthewrudy/memoist
Licenses:
Latest release: 0.16.2-3 (published 27 days ago)
Last Synced: 2026-02-11T06:43:10.234Z (27 days ago)
Versions: 1
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debian-12: ruby-memoist

Homepage: https://github.com/matthewrudy/memoist
Documentation: https://packages.debian.org/bookworm/ruby-memoist
Licenses:
Latest release: 0.16.2-3 (published 26 days ago)
Last Synced: 2026-02-12T23:34:53.439Z (26 days ago)
Versions: 1
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Dependent Repositories: 0
Rankings:

ubuntu-24.10: ruby-memoist

Homepage: https://github.com/matthewrudy/memoist
Licenses:
Latest release: 0.16.2-3 (published 29 days ago)
Last Synced: 2026-02-09T16:53:44.400Z (29 days ago)
Versions: 1
Dependent Packages: 0
Dependent Repositories: 0
Rankings:

ubuntu-24.04: ruby-memoist

Homepage: https://github.com/matthewrudy/memoist
Licenses:
Latest release: 0.16.2-3 (published about 1 month ago)
Last Synced: 2026-03-06T16:00:55.081Z (4 days ago)
Versions: 1
Dependent Packages: 0
Dependent Repositories: 0
Rankings:

debian-13: ruby-memoist

Homepage: https://github.com/matthewrudy/memoist
Documentation: https://packages.debian.org/trixie/ruby-memoist
Licenses:
Latest release: 0.16.2-3 (published 26 days ago)
Last Synced: 2026-02-13T13:17:25.948Z (25 days ago)
Versions: 1
Dependent Packages: 0
Dependent Repositories: 0
Rankings:
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- Average: 100%

Dependencies

memoist.gemspec rubygems

benchmark-ips >= 0 development
bundler >= 0 development
minitest ~> 5.10 development
rake >= 0 development
rake ~> 10.4 development

.github/workflows/ci.yml actions

actions/checkout v2 composite

Gemfile rubygems

Score: 31.153173964708927