Fix single arity template handler deprecation warning for Rails 6

[lavika]

After upgrading our application to Rails 6, I am getting this deprecation warning

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:
  >> ActionView::Template::Handlers::JsonifyBuilder.call(template)
To:
  >> ActionView::Template::Handlers::JsonifyBuilder.call(template, source)

when I start the server.

It has been resolved by other template gems -

cofee-rails rails/coffee-rails@cbf6af6
prawn-rails cortiz/prawn-rails@9be2087

I have used a similar approach to resolve this here. Please let me know if this works.

[sukeerthiadiga]

+1

[smlsml]

I assume the upstream is unmaintained yeah? It'd be nice if we didn't have to maintain our own fork if they will take this change too!

[lavika]

I assume the upstream is unmaintained yeah? It'd be nice if we didn't have to maintain our own fork if they will take this change too!

Yes correct. The upstream is unmaintained. I tried to get this change in the upstream, but there has not been any response since one year. Reference - bsiggelkow/jsonify-rails#12.
Hence we decided to fork it and maintain the fork.