Devise & AWS-S3 incompatibility

[Ellyster]

I think this issue is completely different to #985

When using:

Using rails 4.1.4
Using warden 1.2.3
Using devise 3.3.0

If I add:

Using aws-s3 0.6.3

I get NoMethodError errors in both Devise::Sessions#new and Devise::Registrations#new:

Showing /Example/app/views/devise/registrations/new.html.erb where line 17 raised: undefined method `new' for nil:NilClass

<%= form_for(resource, as: resource_name, url: registration_path(resource_name), :html => {class: 'well', id:'signup'}) do |f| %>

Showing /Example/app/views/devise/sessions/new.html.erb where line 14 raised: undefined method `new' for nil:NilClass

<%= form_for(resource, as: resource_name, url: session_path(resource_name), :html => {class: 'well', id:'login'}) do |f| %>

[lucasmazza]

Can you please provide a sample application that reproduces the error?

[Ellyster]

Sure!

I just finished it:
https://github.com/Ellyster/DeviseBugExample

[lucasmazza]

Looks like aws-s3 is messing with ActionView::Base.default_form_builder, that instead of returning ActionView::Helpers::FormBuilder is returning nil - this can be replicated by justing generating a scaffold in a fresh app with aws-s3, even without Devise.

Looks like aws-s3 is overriding the cattr_accessor method from ActiveSupport and breaking some Rails internals. I think this should be reported back to the aws-s3 repo and fixed and their end.

[Ellyster]

Right!
Just done in marcel/aws-s3#102

Thanks :)