Yet Another
OO
Rails helper
Mark from Taiwan
twitter: @lulalala_it
github: @lulalala
Rails Helpers are not OO enough
We are OO 聖騎士
looks not OO! No stars!
looks OO! Zen!
<%= nicely_format_money(money) %>
<%= money.nice_format %>
Need different name for different class, no stars!
Can use same name! Zen!
<%= book_cover_image(@book) %>
<%= cd_cover_image(@cd) %>
<%= @book.cover_image %>
<%= @cd.cover_image %>
(I am a very
浅い
OO 聖騎士)
So people make gems to make helpers
OO
Draper gem
@article = Article.
find(params[:id]).
decorate
<%= @article.publication_status %>
You need to decorate in controller
Draper gem
class ArticleDecorator < Draper::Decorator
delegate_all
def publication_status
h.link_to(
status + " " + level,
article_path(42)
)
end
end
@user = User.first
<%= @user.link %>
Automagically decorate
everything for you.
module UserDecorator
def link
link_to full_name, website
end
end
No need to type `h.link_to`.
`link_to` goes to decorator
`full_name` goes to model
So magical!
Decorator
ActiveRecord object
I (am hard to please and) feel magic may be dangerous
(steal)
🍴fork
lulalala/lulalala_presenter
@user = User.first
<%= @user.presenter.link %>
You access methods in presenter object,
in view.
Calling record.presenter
gives us a PORO
class UserPresenter < LulalalaPresenter::Base
def link
h.link_to model.full_name, model.website
end
end
`h` stands for helper,
which is view context object.
`model` is the model
Less Magic
ActiveRecord
object
Presenter
😞 ➡️ 😃
People complain:
"decorators" mix model with view together.
Now view methods
are in own object
You won't forget to remember to decorate it in controller
Only one look,
and you know it is presetnter
book.presenter.isbn_image_tag
😞 ➡️ 😃
When Rails.version += 0.1
gem break probability = foo
When Rails.version += 0.1
gem break probability = foo/bar
Please
Trytry
Epilogue
I found another gem which has even less magic
RobinBrouwer/exhibit
- No magic of storing view context per thread
- exhibit(@user)
instead of
@user.presenter
Perfect for magic-haters!
Good if you hate magic more than I do
lulalala_presenter
Mark from Taiwan
twitter: @lulalala_it
github: @lulalala
helpers
By lulalala
helpers
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