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Contents
# frozen_string_literal: true
module ActiveModel
module Type
# = 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 <tt>"t"</tt> and
# +false+ will be cast to <tt>"f"</tt>. These strings can be customized when
# declaring an attribute:
#
# class Person
# include ActiveModel::Attributes
#
# attribute :active, :immutable_string, true: "aye", false: "nay"
# end
#
# person = Person.new
# person.active = true
#
# person.active # => "aye"
class ImmutableString < Value
def initialize(**args)
@true = -(args.delete(:true)&.to_s || "t")
@false = -(args.delete(:false)&.to_s || "f")
super
end
def type
:string
end
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
def serialize_cast_value(value) # :nodoc:
value
end
private
def cast_value(value)
case value
when true then @true
when false then @false
else value.to_s.freeze
end
end
end
end
end
Version data entries
42 entries across 42 versions & 6 rubygems