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Does One Really Need That Gem?
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Penelope Phippen
July 20, 2015
Technology
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Does One Really Need That Gem?
Penelope Phippen
July 20, 2015
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Transcript
Does one really need that Gem?
a!/samphippen
NO
Let’s have some questions a!/samphippen
[email protected]
you: ಠ_ಠ
NO
Bundler
Bundler is one of the best package managers of all
time
Sincerely
Let’s have some questions !!/samphippen
[email protected]
Problem
We specified one Gem in our Gemfile
We got 6 gems installed
Transitive dependencies
You presumably trust the RSpec core team
Let’s have some questions !!/samphippen
[email protected]
Had you heard of diff-lcs before today?
Do you trust its author?
Even the most mature gems can have surprises in them
(rails)
What’s in a Gem?
ActiveRecord
activerecord.gemspec
Gem::Specification.new do |s|
s.platform = Gem::Platform::RUBY s.name = 'activerecord' s.version = version s.summary
= ‘Object-relationa…’ s.description = 'Databases on Rails…’
s.platform = Gem::Platform::RUBY s.name = 'activerecord' s.version = version s.summary
= ‘Object-relationa…’ s.description = 'Databases on Rails…’
version = File.read(File.expand_path('../../ RAILS_VERSION', __FILE__)).strip
s.license = 'MIT'
s.add_dependency( ‘activesupport', version) s.add_dependency( ‘activemodel’, version) s.add_dependency( ‘arel', ‘7.0.0.alpha')
lib and bin directories
A critical approach
None
We’ve all done this
We can do better
None
The Ruby Toolbox is your friend
None
State machine versus AASM
Most gems are hideously understaffed
None
None
Remember these people are working for free!
Versioning
SemVer is our standard
M.m.p
M.m.p We fixed one or more bugs
M.m.p We added one or more features
M.m.p We broke one or more APIs
0.m.p We can break your shit at any moment
None
None
Vendoring
There is no shame in vending code
Sometimes you do not need an entire gem
< 100loc
Let’s have some questions a!/samphippen
[email protected]