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Active Model ImmutableString Type ↑

Attribute type to represent immutable strings. It casts incoming values to frozen strings.

class Person
  include ActiveModel::Attributes

  attribute :name, :immutable_string
end

person = Person.new
person.name = 1

person.name # => "1"
person.name.frozen? # => true

Values are coerced to strings using their to_s method. Boolean values are treated differently, however: true will be cast to "t" and false will be cast to "f".

Methods
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Included Modules

Class Public methods

new(**args)

Source: show | on GitHub 

# File activemodel/lib/active_model/type/immutable_string.rb, line 28
def initialize(**args)
  @true  = -(args.delete(:true)&.to_s  || "t")
  @false = -(args.delete(:false)&.to_s || "f")
  super
end

Instance Public methods

as_schema_json()

Source: show | on GitHub 

# File activemodel/lib/active_model/type/immutable_string.rb, line 51
def as_schema_json
  super.merge!("true" => @true, "false" => @false)
end

init_from_schema_json(coder, references)

Source: show | on GitHub 

# File activemodel/lib/active_model/type/immutable_string.rb, line 55
def init_from_schema_json(coder, references)
  super
  @true = coder["true"]
  @false = coder["false"]
end

serialize(value)

Source: show | on GitHub 

# File activemodel/lib/active_model/type/immutable_string.rb, line 38
def serialize(value)
  case value
  when ::Numeric, ::Symbol, ActiveSupport::Duration then value.to_s
  when true then @true
  when false then @false
  else super
  end
end

type()

Source: show | on GitHub 

# File activemodel/lib/active_model/type/immutable_string.rb, line 34
def type
  :string
end