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[28] Cover image for Decorating Ruby - Part Two - Method Added Decoration
[29]Brandon Weaver
[30]Brandon Weaver
Posted on Aug 18, 2019 • Updated on Jan 21, 2021
● ● ● ● ●
Decorating Ruby - Part Two - Method Added Decoration
[31]#ruby
[32]Decorating Ruby (3 Part Series)
[33] 1 Decorating Ruby - Part One - Symbol Method Decoration [34] 2 Decorating
Ruby - Part Two - Method Added Decoration [35] 3 Decorating Ruby - Part Three -
Prepending Decoration
One precursor of me writing an article is if I keep forgetting how something's
done, causing me to write a reference to look back on for later. This is one
such article.
[36] What's in Store for Today?
We'll be looking at the next type of decoration, which involves intercepting
method_added to make a more fluent interface.
[37]The "Dark Lord" Crimson with Metaprogramming magic
Table of Contents
• [38]Part One - Symbol Method Decoration
• [39]Part Two - Method Added Decoration
• [40]Part Three - Prepending Decoration
[41]<< Previous | [42]Next >>
[43] What Does Method Added Decoration Look Like?
You've seen the Symbol Method variant:
private def something; end
Readers that were paying very close attention in the last article may have
noticed when I said that I preferred that style of declaring private methods in
Ruby, but this was after the way that can be debatably considered more popular
and widely used in the community:
private
def something; end
def something_else; end
Using private like this means that every method defined after will be
considered private. We know how the first one works, but what about the second?
There's no way it's using method names because it catches both of those methods
and doesn't change the definition syntax.
That's what we'll be looking into and learning today, and let me tell you it's
a metaprogramming trip.
[44] Making Our Own Method Added Decoration
As with the last article we're going to need to learn about a few tools before
we'll be ready to implement this one.
[45] Module Inclusion
Ruby uses Module inclusion as a way to extend classes with additional behavior,
sometimes requiring an interface to be met before it can do so. Enumerable is
one of the most common, and requires an each implementation to work:
class Collection
include Enumerable
def initialize(*items)
@items = items
end
def each(&fn)
return @items.to_enum unless block_given?
@items.each { |item| fn.call(item) }
end
end
(yield could be used here instead, but is less explicit and can be confusing to
teach.)
By defining that one method we've given our class the ability to do all types
of amazing things like map, select, and more.
Through those few lines we've added a lot of functionality to a class. Here's
the interesting part about Ruby: it also provides hooks to let Enumerable know
it was included, including what included it.
[46] Feeling Included
Let's say we have our own module, [47]Affable, which gives us a method to say
"hi":
module Affable
def greeting
"It's so very lovely to see you today!"
end
end
My, it is quite an [48]Affable module, now isn't it?
We could even go as far as to make a particularly Affable lemur:
class Lemur
include Affable
def initialize(name) @name = name; end
end
Lemur.new("Indigo").greeting
=> "It's so very lovely to see you today!"
What a classy lemur, yes.
[49] Hook, Line, and Sinker
Let's say that we wanted to tell what particular animal was Affable. We can use
included to see just that:
module Affable
def self.included(klass)
puts "#{klass.name} has become extra Affable!"
end
end
If we were to re-include that module:
class Lemur
include Affable
def initialize(name) @name = name; end
end
# STDOUT: Lemur has become extra Affable!
# => :initialize
Right classy. Oh, right, speaking of classy...
[50] Extra Classy Indeed
So we can hook inclusion of a module, great! Why do we care?
What if we wanted to both include methods into a class as well as extend its
behavior?
With just include it will apply all the behavior to instances of a class. With
just extend it will apply all the behavior to the class itself. We can't do
both.
...ok ok, it's Ruby, you caught me, we can totally do both.
As it turns out, include and extend are just methods on a class. We could just
Lemur.extend(ExtraBehavior) if we wanted to, or we could use our fun little
hooks from earlier.
A common convention for using this technique is a sub-module called
ClassMethods, like so:
module Affable
def self.included(klass)
klass.extend(ClassMethods)
end
module ClassMethods
def affable?
true
end
end
end
This allows us to inject behavior directly into the class as well as other
behavior we want to include in instances.
Part of me thinks this is so I don't have to remember the difference between
include and extend, but I always remember that and don't have to spend 20
minutes flipping between the two and prepend to see which one actually works,
absolutely not.
Now remember the title about Method Added being the technique for today? Oh
yes, there's a hook for that as well, but first we need to indicate that
something needs to be hooked in the first place.
[51] Raise Your Flag
We can intercept a method being added, but how do we know which method should
be intercepted? We'd need to add a flag to let that hook know it's time to
start intercepting in full force.
module Affable
def self.included(klass)
klass.extend(ClassMethods)
end
module ClassMethods
def extra_affable
@extra_affable = true
end
end
end
If you remember private, this could be the flag to indicate that every method
afterwards should be private:
private
def something; end
def something_else; end
Same idea here, and once a flag is raised it can also be taken down to make
sure later methods aren't impacted as well. We keep hinting at hooking method
added, so let's go ahead and do just that.
[52] Method Added
Now that we have our flag, we have enough to hook into method_added:
module Affable
def self.included(klass)
klass.extend(ClassMethods)
end
module ClassMethods
def extra_affable
@extra_affable = true
end
def method_added(method_name)
return unless @extra_affable
@extra_affable = false
# ...
end
end
end
We can use our flag to ignore method_added unless said flag is set. After we
check that, we can take down the flag to make sure additional methods defined
after aren't affected as well. For private this doesn't happen, but we want to
be polite. It is and Affable module after all.
[53] Politely Aliasing
Speaking of politeness, it's not precisely kind to just overwrite a method
without giving a way to call it as it was. We can use alias_method to get a new
name to the method before we overwrite it:
def method_added(method_name)
return unless @extra_affable
@extra_affable = false
original_method_name = "#{method_name}_without_affability".to_sym
alias_method original_method_name, method_name
end
This means that we can access the original method through this name.
[54] Wrap Battle
So we have the original method aliased, our hook in place, let's get to
overwriting that method then! As with the last tutorial we can use
define_method to do this:
module Affable
def self.included(klass)
klass.extend(ClassMethods)
end
module ClassMethods
def extra_affable
@extra_affable = true
end
def method_added(method_name)
return unless @extra_affable
@extra_affable = false
original_method_name = "#{method_name}_without_affability".to_sym
alias_method original_method_name, method_name
define_method(method_name) do |*args, &fn|
original_result = send(original_method_name, *args, &fn)
"#{original_result} Very lovely indeed!"
end
end
end
end
Overwriting our original class again:
class Lemur
include Affable
def initialize(name) @name = name; end
extra_affable
def farewell
"Farewell! It was lovely to chat."
end
end
We can give it a try:
Lemur.new("Indigo").farewell
=> "Farewell! It was lovely to chat. Very lovely indeed!"
[55] send Help!
Wait wait wait wait, send? Didn't we use method last time?
We did, but remember that method_added is a class method that does not have the
context of an instance of the class, or in other words it has no idea where the
farewell method is located.
send lets us treat this as an instance again by sending the method name
directly. Now we could use method inside of here as well, but that can be a bit
more expensive.
Only the contents inside define_method's block are executed in the context of
the instance.
[56] executive Functions
If we wanted to, we could have our special method take blocks which execute in
the context of an instance as well, and this is an extra special bonus trick
for this post.
Say that we made extra_affable also take a block that allows us to manipulate
the original value and still execute in the context of the instance:
class Lemur
include Affable
def initialize(name) @name = name; end
extra_affable { |original|
"#{@name}: #{original} Very lovely indeed!"
}
def farewell
"Farewell! It was lovely to chat."
end
end
With normal blocks, this will evaluate in the context of the class, but we want
it to evaluate in the context of the instance instead. That's what we have
instance_exec for:
module Affable
def self.included(klass)
klass.extend(ClassMethods)
end
module ClassMethods
def extra_affable(&fn)
@extra_affable = true
@extra_affable_fn = fn
end
def method_added(method_name)
return unless @extra_affable
@extra_affable = false
extra_affable_fn = @extra_affable_fn
original_method_name = "#{method_name}_without_affability".to_sym
alias_method original_method_name, method_name
define_method(method_name) do |*args, &fn|
original_result = send(original_method_name, *args, &fn)
instance_exec(original_result, &extra_affable_fn)
end
end
end
end
Running that gives us this:
Lemur.new("Indigo").farewell
# => "Indigo: Farewell! It was lovely to chat. Very lovely indeed!"
Now pay very close attention to this line:
extra_affable_fn = @extra_affable_fn
We need to use this because inside define_method's block is inside the
instance, which has no clue what @extra_affable_fn is. That said, it can still
see outside to the context where the block was called, meaning it can see that
local version of extra_affable_fn sitting right there, allowing us to call it:
instance_exec(original_result, &extra_affable_fn)
[57] instance_eval vs instance_exec?
Why not use instance_eval? instance_exec allows us to pass along arguments as
well, otherwise instance_eval would make a lot of sense to evaluate something
in an instance. Instead, we need to execute something in the context of an
instance, so we use instance_exec here.
[58] Wrapping Up
So that was quite a lot of magic, and it took me a fair bit to really
understand what some of it was doing and why. That's perfectly ok, if I
understood everything the first time I'd be worried because that means I'm not
really learning anything!
One issue I think this will have later is I wonder how poorly having multiple
hooks to method_added will work. If it turns out it makes things go boom in a
spectacularly pretty and confounding way there'll be a part three. If not, this
paragraph will disappear and I'll pretend to not know what you're talking about
if you ask me about it.
There's a lot of potential here for some really interesting things, but there's
also a lot of potential for abuse. Be sure to not abuse such magic, because for
every layer of redefinition code can become increasingly harder to reason about
and test later.
In most cases I would instead advocate for SimpleDelegate, Forwardable, or
simple inheritance with super to extend behavior of classes. Don't use a
chainsaw where hedge trimmers will do, but on occasion it's nice to know a
chainsaw is there for those particularly gnarly problems.
Discretion is the name of the game.
Table of Contents
• [59]Part One - Symbol Method Decoration
• [60]Part Two - Method Added Decoration
• [61]Part Three - Prepending Decoration
[62]<< Previous | [63]Next >>
[64]Decorating Ruby (3 Part Series)
[65] 1 Decorating Ruby - Part One - Symbol Method Decoration [66] 2 Decorating
Ruby - Part Two - Method Added Decoration [67] 3 Decorating Ruby - Part Three -
Prepending Decoration
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• [84] Aug 18 '19 • Edited on Aug 18 • Edited
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Wow this is really cool, thanks for sharing Brandon!
Is there a way to hook onto the last method_added? For example I'd like to
execute something after all methods are added
EDIT: also quick search online seems to say that method_added only works for
instance methods, but there's singleton_method_added hook for class methods
too!
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[91] Brandon Weaver
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Technically in Ruby there's never a point in which methods are no longer added,
so it's a bit hard to hook that. One potential is to use TracePoint to hook the
ending of a class definition and retaining a class of "infected" classes, but
that'd be slow.
Look for "Class End Event" in this article: [99]medium.com/@baweaver/
exploring-tra...
EDIT - ...though now I'm curious if one could use such things to freeze a class
from modifications.
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References:
[1] https://dev.to/baweaver/decorating-ruby-part-two-method-added-decoration-48mj#main-content
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[51] https://dev.to/baweaver/decorating-ruby-part-two-method-added-decoration-48mj#raise-your-flag
[52] https://dev.to/baweaver/decorating-ruby-part-two-method-added-decoration-48mj#method-added
[53] https://dev.to/baweaver/decorating-ruby-part-two-method-added-decoration-48mj#politely-aliasing
[54] https://dev.to/baweaver/decorating-ruby-part-two-method-added-decoration-48mj#wrap-battle
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[67] https://dev.to/baweaver/decorating-ruby-part-three-prepending-decoration-1ehc
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[118] https://dev.to/baweaver
[119] https://dev.to/baweaver/understanding-ruby-memoization-2be5
[120] https://dev.to/baweaver/in-favor-of-ruby-central-memberships-15gl
[121] https://dev.to/baweaver/pattern-matching-interfaces-in-ruby-1b15
[130] javascript:void(0);
[133] https://dev.to/
[134] https://dev.to/
[135] https://dev.to/pod
[136] https://dev.to/videos
[137] https://dev.to/tags
[138] https://dev.to/faq
[139] https://shop.forem.com/
[140] https://dev.to/advertise
[141] https://dev.to/about
[142] https://dev.to/contact
[143] https://dev.to/guides
[144] https://dev.to/software-comparisons
[145] https://dev.to/code-of-conduct
[146] https://dev.to/privacy
[147] https://dev.to/terms
[148] https://www.forem.com/
[149] https://dev.to/t/opensource
[150] https://dev.to/
[151] https://dev.to/t/rails
[152] https://dev.to/enter
[153] https://dev.to/enter?state=new-user