DeprecatedInstanceVariableProxy
transforms an instance variable into a deprecated one. It takes an instance of a class, a method on that class, an instance variable, and a deprecator as the last argument.
Trying to use the deprecated instance variable will result in a deprecation warning, pointing to the method as a replacement.
class Example
def initialize
@request = ActiveSupport::Deprecation::DeprecatedInstanceVariableProxy.new(self, :request, :@request, ActiveSupport::Deprecation.new)
@_request = :special_request
end
def request
@_request
end
def old_request
@request
end
end
example = Example.new
# => #<Example:0x007fb9b31090b8 @_request=:special_request, @request=:special_request>
example.old_request.to_s
# => DEPRECATION WARNING: @request is deprecated! Call request.to_s instead of
@request.to_s
(Backtrace information…)
"special_request"
example.request.to_s
# => "special_request"
Methods
- N
Class Public methods
new(instance, method, var = "@#{method}", deprecator = nil) Link
# File activesupport/lib/active_support/deprecation/proxy_wrappers.rb, line 89 def initialize(instance, method, var = "@#{method}", deprecator = nil) @instance = instance @method = method @var = var ActiveSupport.deprecator.warn("DeprecatedInstanceVariableProxy without a deprecator is deprecated") unless deprecator @deprecator = deprecator || ActiveSupport::Deprecation._instance end