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b2f49f27ad
This refactors `ActiveModel::Name#human` to reduce allocations and
improve performance by ~2x when a translation is not defined.
Benchmark script:
```ruby
require "benchmark/memory"
require "benchmark/ips"
class BaseModel
extend ActiveModel::Translation
end
BlogPost = Class.new(BaseModel)
Benchmark.memory do |x|
x.report("warmup") { BlogPost.model_name.human }
x.report("human") { BlogPost.model_name.human }
end
Benchmark.ips do |x|
x.report("human") { BlogPost.model_name.human }
end
```
Before:
```
Calculating -------------------------------------
warmup 964.242k memsize ( 23.575k retained)
2.157k objects ( 310.000 retained)
50.000 strings ( 50.000 retained)
human 4.144k memsize ( 0.000 retained)
32.000 objects ( 0.000 retained)
6.000 strings ( 0.000 retained)
Warming up --------------------------------------
human 870.000 i/100ms
Calculating -------------------------------------
human 8.434k (± 0.8%) i/s - 42.630k in 5.054943s
```
After:
```
Calculating -------------------------------------
warmup 962.418k memsize ( 23.607k retained)
2.143k objects ( 310.000 retained)
50.000 strings ( 50.000 retained)
human 2.112k memsize ( 0.000 retained)
16.000 objects ( 0.000 retained)
1.000 strings ( 0.000 retained)
Warming up --------------------------------------
human 1.851k i/100ms
Calculating -------------------------------------
human 18.492k (± 0.7%) i/s - 92.550k in 5.005100s
```
351 lines
11 KiB
Ruby
351 lines
11 KiB
Ruby
# frozen_string_literal: true
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require "active_support/core_ext/hash/except"
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require "active_support/core_ext/module/introspection"
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require "active_support/core_ext/module/redefine_method"
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require "active_support/core_ext/module/delegation"
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module ActiveModel
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class Name
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include Comparable
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attr_accessor :singular, :plural, :element, :collection,
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:singular_route_key, :route_key, :param_key, :i18n_key,
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:name
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alias_method :cache_key, :collection
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##
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# :method: ==
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#
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# :call-seq:
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# ==(other)
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#
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# Equivalent to <tt>String#==</tt>. Returns +true+ if the class name and
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# +other+ are equal, otherwise +false+.
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#
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# class BlogPost
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# extend ActiveModel::Naming
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# end
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#
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# BlogPost.model_name == 'BlogPost' # => true
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# BlogPost.model_name == 'Blog Post' # => false
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##
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# :method: ===
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#
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# :call-seq:
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# ===(other)
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#
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# Equivalent to <tt>#==</tt>.
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#
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# class BlogPost
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# extend ActiveModel::Naming
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# end
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#
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# BlogPost.model_name === 'BlogPost' # => true
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# BlogPost.model_name === 'Blog Post' # => false
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##
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# :method: <=>
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#
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# :call-seq:
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# <=>(other)
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#
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# Equivalent to <tt>String#<=></tt>.
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#
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# class BlogPost
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# extend ActiveModel::Naming
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# end
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#
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# BlogPost.model_name <=> 'BlogPost' # => 0
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# BlogPost.model_name <=> 'Blog' # => 1
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# BlogPost.model_name <=> 'BlogPosts' # => -1
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##
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# :method: =~
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#
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# :call-seq:
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# =~(regexp)
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#
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# Equivalent to <tt>String#=~</tt>. Match the class name against the given
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# regexp. Returns the position where the match starts or +nil+ if there is
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# no match.
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#
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# class BlogPost
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# extend ActiveModel::Naming
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# end
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#
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# BlogPost.model_name =~ /Post/ # => 4
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# BlogPost.model_name =~ /\d/ # => nil
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##
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# :method: !~
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#
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# :call-seq:
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# !~(regexp)
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#
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# Equivalent to <tt>String#!~</tt>. Match the class name against the given
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# regexp. Returns +true+ if there is no match, otherwise +false+.
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#
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# class BlogPost
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# extend ActiveModel::Naming
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# end
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#
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# BlogPost.model_name !~ /Post/ # => false
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# BlogPost.model_name !~ /\d/ # => true
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##
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# :method: eql?
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#
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# :call-seq:
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# eql?(other)
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#
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# Equivalent to <tt>String#eql?</tt>. Returns +true+ if the class name and
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# +other+ have the same length and content, otherwise +false+.
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#
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# class BlogPost
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# extend ActiveModel::Naming
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# end
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#
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# BlogPost.model_name.eql?('BlogPost') # => true
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# BlogPost.model_name.eql?('Blog Post') # => false
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##
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# :method: match?
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#
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# :call-seq:
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# match?(regexp)
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#
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# Equivalent to <tt>String#match?</tt>. Match the class name against the
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# given regexp. Returns +true+ if there is a match, otherwise +false+.
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#
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# class BlogPost
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# extend ActiveModel::Naming
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# end
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#
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# BlogPost.model_name.match?(/Post/) # => true
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# BlogPost.model_name.match?(/\d/) # => false
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##
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# :method: to_s
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#
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# :call-seq:
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# to_s()
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#
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# Returns the class name.
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#
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# class BlogPost
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# extend ActiveModel::Naming
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# end
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#
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# BlogPost.model_name.to_s # => "BlogPost"
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##
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# :method: to_str
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#
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# :call-seq:
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# to_str()
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#
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# Equivalent to +to_s+.
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delegate :==, :===, :<=>, :=~, :"!~", :eql?, :match?, :to_s,
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:to_str, :as_json, to: :name
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# Returns a new ActiveModel::Name instance. By default, the +namespace+
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# and +name+ option will take the namespace and name of the given class
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# respectively.
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# Use +locale+ argument for singularize and pluralize model name.
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#
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# module Foo
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# class Bar
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# end
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# end
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#
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# ActiveModel::Name.new(Foo::Bar).to_s
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# # => "Foo::Bar"
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def initialize(klass, namespace = nil, name = nil, locale = :en)
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@name = name || klass.name
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raise ArgumentError, "Class name cannot be blank. You need to supply a name argument when anonymous class given" if @name.blank?
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@unnamespaced = @name.delete_prefix("#{namespace.name}::") if namespace
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@klass = klass
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@singular = _singularize(@name)
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@plural = ActiveSupport::Inflector.pluralize(@singular, locale)
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@uncountable = @plural == @singular
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@element = ActiveSupport::Inflector.underscore(ActiveSupport::Inflector.demodulize(@name))
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@human = ActiveSupport::Inflector.humanize(@element)
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@collection = ActiveSupport::Inflector.tableize(@name)
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@param_key = (namespace ? _singularize(@unnamespaced) : @singular)
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@i18n_key = @name.underscore.to_sym
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@route_key = (namespace ? ActiveSupport::Inflector.pluralize(@param_key, locale) : @plural.dup)
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@singular_route_key = ActiveSupport::Inflector.singularize(@route_key, locale)
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@route_key << "_index" if @uncountable
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end
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# Transform the model name into a more human format, using I18n. By default,
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# it will underscore then humanize the class name.
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#
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# class BlogPost
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# extend ActiveModel::Naming
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# end
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#
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# BlogPost.model_name.human # => "Blog post"
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#
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# Specify +options+ with additional translating options.
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def human(options = {})
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return @human if i18n_keys.empty? || i18n_scope.empty?
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key, *defaults = i18n_keys
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defaults << options[:default] if options[:default]
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defaults << MISSING_TRANSLATION
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translation = I18n.translate(key, scope: i18n_scope, count: 1, **options, default: defaults)
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translation = @human if translation == MISSING_TRANSLATION
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translation
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end
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def uncountable?
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@uncountable
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end
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private
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MISSING_TRANSLATION = Object.new # :nodoc:
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def _singularize(string)
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ActiveSupport::Inflector.underscore(string).tr("/", "_")
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end
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def i18n_keys
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@i18n_keys ||= if @klass.respond_to?(:lookup_ancestors)
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@klass.lookup_ancestors.map { |klass| klass.model_name.i18n_key }
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else
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[]
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end
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end
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def i18n_scope
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@i18n_scope ||= @klass.respond_to?(:i18n_scope) ? [@klass.i18n_scope, :models] : []
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end
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end
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# == Active \Model \Naming
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#
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# Creates a +model_name+ method on your object.
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#
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# To implement, just extend ActiveModel::Naming in your object:
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#
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# class BookCover
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# extend ActiveModel::Naming
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# end
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#
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# BookCover.model_name.name # => "BookCover"
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# BookCover.model_name.human # => "Book cover"
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#
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# BookCover.model_name.i18n_key # => :book_cover
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# BookModule::BookCover.model_name.i18n_key # => :"book_module/book_cover"
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#
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# Providing the functionality that ActiveModel::Naming provides in your object
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# is required to pass the \Active \Model Lint test. So either extending the
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# provided method below, or rolling your own is required.
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module Naming
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def self.extended(base) # :nodoc:
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base.silence_redefinition_of_method :model_name
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base.delegate :model_name, to: :class
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end
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# Returns an ActiveModel::Name object for module. It can be
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# used to retrieve all kinds of naming-related information
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# (See ActiveModel::Name for more information).
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#
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# class Person
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# extend ActiveModel::Naming
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# end
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#
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# Person.model_name.name # => "Person"
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# Person.model_name.class # => ActiveModel::Name
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# Person.model_name.singular # => "person"
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# Person.model_name.plural # => "people"
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def model_name
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@_model_name ||= begin
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namespace = module_parents.detect do |n|
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n.respond_to?(:use_relative_model_naming?) && n.use_relative_model_naming?
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end
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ActiveModel::Name.new(self, namespace)
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end
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end
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# Returns the plural class name of a record or class.
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#
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# ActiveModel::Naming.plural(post) # => "posts"
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# ActiveModel::Naming.plural(Highrise::Person) # => "highrise_people"
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def self.plural(record_or_class)
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model_name_from_record_or_class(record_or_class).plural
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end
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# Returns the singular class name of a record or class.
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#
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# ActiveModel::Naming.singular(post) # => "post"
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# ActiveModel::Naming.singular(Highrise::Person) # => "highrise_person"
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def self.singular(record_or_class)
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model_name_from_record_or_class(record_or_class).singular
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end
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# Identifies whether the class name of a record or class is uncountable.
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#
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# ActiveModel::Naming.uncountable?(Sheep) # => true
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# ActiveModel::Naming.uncountable?(Post) # => false
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def self.uncountable?(record_or_class)
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model_name_from_record_or_class(record_or_class).uncountable?
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end
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# Returns string to use while generating route names. It differs for
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# namespaced models regarding whether it's inside isolated engine.
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#
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# # For isolated engine:
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# ActiveModel::Naming.singular_route_key(Blog::Post) # => "post"
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#
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# # For shared engine:
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# ActiveModel::Naming.singular_route_key(Blog::Post) # => "blog_post"
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def self.singular_route_key(record_or_class)
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model_name_from_record_or_class(record_or_class).singular_route_key
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end
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# Returns string to use while generating route names. It differs for
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# namespaced models regarding whether it's inside isolated engine.
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#
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# # For isolated engine:
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# ActiveModel::Naming.route_key(Blog::Post) # => "posts"
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#
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# # For shared engine:
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# ActiveModel::Naming.route_key(Blog::Post) # => "blog_posts"
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#
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# The route key also considers if the noun is uncountable and, in
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# such cases, automatically appends _index.
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def self.route_key(record_or_class)
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model_name_from_record_or_class(record_or_class).route_key
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end
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# Returns string to use for params names. It differs for
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# namespaced models regarding whether it's inside isolated engine.
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#
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# # For isolated engine:
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# ActiveModel::Naming.param_key(Blog::Post) # => "post"
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#
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# # For shared engine:
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# ActiveModel::Naming.param_key(Blog::Post) # => "blog_post"
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def self.param_key(record_or_class)
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model_name_from_record_or_class(record_or_class).param_key
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end
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def self.model_name_from_record_or_class(record_or_class) # :nodoc:
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if record_or_class.respond_to?(:to_model)
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record_or_class.to_model.model_name
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else
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record_or_class.model_name
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end
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end
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private_class_method :model_name_from_record_or_class
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end
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end
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