Redmine

A deprecation warning "Single arity template handlers are deprecated" is shown in Rails 6.

$ bin/rails test test/unit/attachment_test.rb
.
.
.
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:
  >> Redmine::Views::ApiTemplateHandler.call(template)
To:
  >> Redmine::Views::ApiTemplateHandler.call(template, source)
 (called from <top (required)> at /path/to/redmine/lib/redmine.rb:353)