Using Draper with InheritedResources or ActiveAdmin

[jcarlson]

I would love to use Draper with a back-end helper like ActiveAdmin... the trouble is that InheritedResources and ActiveAdmin depend a lot on scopes, and thus the ActiveRecord::Relation class.

For example:

>> posts = Post.published   # a scope on the Post model
=> [...some Post instances]
>> posts.class
=> ActiveRecord::Relation
>> posts = PostDecorator.decorate(posts)
=> [...some PostDecorator instances]
>> posts.class
=> Array

After decorating the scoped array of Posts, we lose access to the chainable methods that ActiveAdmin is looking for...

Any thoughts?

[jcasimir]

Can you try it with the edge code in the repo? I'm thinking that the just-merged Decorated Collection Proxy will help with this issue.

[jcasimir]

Yes! I just did some tests that indicate this is solved in 0.9.2. I created an ActiveRecord::Relation, then decorated it, then was able to call further AREL methods modifying the collection.

Please comment/reopen if you're still running into issues.

[jcarlson]

Well this certainly helps.

What this does not do, however, is decorate items in the collection when chaining methods on the collection:

>> posts = PostDecorator.decorate Post.scoped
  Post Load (0.1ms)  SELECT "posts".* FROM "posts" 
=> #<Draper::DecoratedEnumerableProxy:0x1057a44e0 @klass=PostDecorator, @context={}, @wrapped_collection=[#<Post id: 1, title: "My first post", content: "# This is an H1\r\n\r\n## This is an H2\r\n\r\n### This is ...", publish_at: "2011-10-22 18:07:00", slug: "", created_at: "2011-10-18 23:05:54", updated_at: "2011-10-22 19:00:08", public: true>]>
>> posts.where(:public => true).first
  Post Load (0.2ms)  SELECT "posts".* FROM "posts" WHERE "posts"."public" = 't' LIMIT 1
=> #<Post id: 1, title: "My first post", content: "# This is an H1\r\n\r\n## This is an H2\r\n\r\n### This is ...", publish_at: "2011-10-22 18:07:00", slug: "", created_at: "2011-10-18 23:05:54", updated_at: "2011-10-22 19:00:08", public: true>

Notice that the Post returned from the call to #first is not decorated!

However, I'm satisfied with what I've got working right now, and I think it's fair to call this little nuance a totally separate issue...

Thanks!

[jcasimir]

Hmmm, now that is interesting! I don't, without more research, know much about how the ARel scopes are added together. If you look into it at all, please report back.

[amiel]

FYI: I'm working on integrating draper support in ActiveAdmin here: activeadmin/activeadmin#1117