Single arity template handlers and rails 6.0.0.beta2

[remomueller]

I'm getting a "Single arity template handlers" error when using haml with the new rails 6.0.0.beta2.

DEPRECATION WARNING: Single arity template handlers are deprecated.  Template handlers must now accept two parameters, the view object and the source for the view object.
Change:
  >> Class#call(template)
To:
  >> Class#call(template, source)

It looks like this is caused by this line of code here:

haml/lib/haml/plugin.rb

Line 22 in c32fa3c

def self.call(template)

The following approach to fix was used in coffee-rails by Aaron Patterson:

rails/coffee-rails@cbf6af6

I've also seen a similar issue request for the slim gem here:
slim-template/slim#827

This is also related to the following rails issue:
rails/rails#35413

Thanks! Let me know if you need additional information!

[alexvirtualbr]

Here I'm getting this error above when I run rails db:migrate

DEPRECATION

WARNING: Single arity template handlers are deprecated. Template handlers must
now accept two parameters, the view object and the source for the view object.
Change:

Class#call(template)
To:
Class#call(template, source)
(called from

at /myApp/Rakefile:6)

I use Rails 6.0.0.beta2 and ruby 2.6

[cbothner]

Closed by #1008

[amatsuda]

done via #1008

[nezirz]

Upgrading the coffee-rails fixed issue in my case on ruby 2.6.4 and rails 6.0.0

[sreenak]

I got the same error, I was using coffee-rails gem version 4.2, updating coffee-rails gem version to 5.0.0 solved my issue. it should resolve your problem. for ref: https://rubygems.org/gems/coffee-rails/versions/5.0.0