Ruby refinements: Difference between revisions
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Refinements let you limit the scope of Monkey-Patches.<br> | Refinements let you limit the scope of Monkey-Patches.<br> | ||
You can override methods, or add new ones, and they will only be applied to classes/modules | You can override methods, or add new ones, and they will only be applied to classes/modules in files where the refinement is used. | ||
= Documentation = | = Documentation = | ||
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<syntaxhighlight lang="ruby"> | <syntaxhighlight lang="ruby"> | ||
class User | class User | ||
def firstname; end | |||
def lastname; end | |||
end | end | ||
module Passenger | module Passenger | ||
refine User | refine User | ||
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<syntaxhighlight lang="ruby"> | <syntaxhighlight lang="ruby"> | ||
# | # uses_refinement.rb | ||
# User instances gain 'buckle_seatbelt' -- but only in this file | |||
using Passenger | using Passenger | ||
user = User.new | |||
user.buckle_seatbelt | |||
</syntaxhighlight> | |||
# | <syntaxhighlight lang="ruby"> | ||
# doesnt_use_refinement.rb | |||
user = User.new | user = User.new | ||
user.buckle_seatbelt | user.buckle_seatbelt # raises exception -- 'buckle_seatbelt not defined' | ||
</syntaxhighlight> | </syntaxhighlight> | ||
</blockquote><!-- Example --> | </blockquote><!-- Example --> | ||
Revision as of 15:26, 14 May 2022
Refinements let you limit the scope of Monkey-Patches.
You can override methods, or add new ones, and they will only be applied to classes/modules in files where the refinement is used.
Documentation
official docs https://docs.ruby-lang.org/en/3.0.0/doc/syntax/refinements_rdoc.html
Example
class User def firstname; end def lastname; end end module Passenger refine User def buckle_seatbelt; end end end# uses_refinement.rb # User instances gain 'buckle_seatbelt' -- but only in this file using Passenger user = User.new user.buckle_seatbelt# doesnt_use_refinement.rb user = User.new user.buckle_seatbelt # raises exception -- 'buckle_seatbelt not defined'
