Install the gem
gem install viewtastic
Load the gem in your environment.rb file
config.gem "viewtastic"
My presenters go into the app/presenters directory of the application so this is added to the load_path in Rails by default by Viewtastic.
A Presenter inherits from Viewtastic::Base and should use the presents method to declare presented objects.
class CommentPresenter < Viewtastic::Base
presents :comment
end
This gives you several 'magic' methods:
- All attributes of comment with the prefix 'comment'. For instance:
comment_body,comment_post,comment_created_at. comment_dom_idis the same as callingdom_id(comment)in a view.
If you want to skip the prefix and just have the attribute name, you can declare:
presents :comment => [:body, :created_at]
and you get presenter.body and presenter.created_at.
Assuming you have a Comment model and your controller has a helper method current_user that returns the user currently logged in, you could make the following presenter to help in presenting products.
class CommentPresenter < Viewtastic::Base
presents :comment
def dom_id
comment_dom_id
end
def owner?
controller.current_user.comments.include?(comment)
end
def links
returning([]) do |links|
links << link_to("Edit", [:edit, comment]) if owner?
links << link_to("Reply", [:new, :comment]) if controller.current_user
end
end
end
each_with_presenter is available on any Array, and it is designed to reuse a single Presenter instance and pass every element in the array as the presented object.
In your view (maybe posts/show.html.erb):
<ul>
<% @post.comments.each_with_presenter(CommentPresenter, :comment) do |comment| %>
<li id="<%= comment.dom_id %>">
<%= comment.body %>
<%= comment.links %>
</li>
<% end %>
</ul>
- ActivePresenter was the inspiration for this project and some of the presenter code was used from ActivePresenter.
- Authlogic -- the Authlogic activation code is used to activate Viewtastic on each request.
Copyright (c) 2009 Istvan Hoka, released under the MIT license