cap -T throw error

[oayoub84]

Hi, after installing caphub and initializing the project, i've created the production.rb file in deploy/namespace/frontoffice/production.rb.

But the cap -T throw me an error:

cap aborted!
NoMethodError: undefined method gsub' for #<Proc:0x007fa56b3f9900> /usr/local/lib/ruby/gems/2.2.0/gems/capistrano-3.5.0/lib/capistrano/defaults.rb:2:inblock in <top (required)>'
/usr/local/lib/ruby/gems/2.2.0/gems/capistrano-3.5.0/lib/capistrano/configuration/variables.rb:126:in call' /usr/local/lib/ruby/gems/2.2.0/gems/capistrano-3.5.0/lib/capistrano/configuration/variables.rb:126:inblock in invoke_validations'
/usr/local/lib/ruby/gems/2.2.0/gems/capistrano-3.5.0/lib/capistrano/configuration/variables.rb:125:in each' /usr/local/lib/ruby/gems/2.2.0/gems/capistrano-3.5.0/lib/capistrano/configuration/variables.rb:125:ininvoke_validations'
/usr/local/lib/ruby/gems/2.2.0/gems/capistrano-3.5.0/lib/capistrano/configuration/variables.rb:34:in set' /Users/USERNAME/www/deploy/config/deploy.rb:9:in<top (required)>'
/usr/local/lib/ruby/gems/2.2.0/gems/rake-11.2.2/lib/rake/rake_module.rb:28:in load' /usr/local/lib/ruby/gems/2.2.0/gems/rake-11.2.2/lib/rake/rake_module.rb:28:inload_rakefile'
/usr/local/lib/ruby/gems/2.2.0/gems/rake-11.2.2/lib/rake/default_loader.rb:10:in load' /usr/local/lib/ruby/gems/2.2.0/gems/rake-11.2.2/lib/rake/application.rb:764:inload_imports'
/usr/local/lib/ruby/gems/2.2.0/gems/capistrano-3.5.0/lib/capistrano/application.rb:96:in load_imports' /usr/local/lib/ruby/gems/2.2.0/gems/rake-11.2.2/lib/rake/application.rb:694:inraw_load_rakefile'
/usr/local/lib/ruby/gems/2.2.0/gems/rake-11.2.2/lib/rake/application.rb:96:in block in load_rakefile' /usr/local/lib/ruby/gems/2.2.0/gems/rake-11.2.2/lib/rake/application.rb:178:instandard_exception_handling'
/usr/local/lib/ruby/gems/2.2.0/gems/rake-11.2.2/lib/rake/application.rb:95:in load_rakefile' /usr/local/lib/ruby/gems/2.2.0/gems/rake-11.2.2/lib/rake/application.rb:79:inblock in run'
/usr/local/lib/ruby/gems/2.2.0/gems/rake-11.2.2/lib/rake/application.rb:178:in standard_exception_handling' /usr/local/lib/ruby/gems/2.2.0/gems/rake-11.2.2/lib/rake/application.rb:77:inrun'
/usr/local/lib/ruby/gems/2.2.0/gems/capistrano-3.5.0/lib/capistrano/application.rb:14:in run' /usr/local/lib/ruby/gems/2.2.0/gems/capistrano-3.5.0/bin/cap:3:in<top (required)>'
/usr/local/bin/cap:23:in load' /usr/local/bin/cap:23:in

'

[ayanko]

Could you show your file layout?

$ tree
$ ls -R

[oayoub84]

.
├── Capfile
├── Gemfile
├── Gemfile.lock
├── config
│   ├── deploy
│   │   └── example.com
│   │   └── frontoffice
│   │   └── production.rb
│   └── deploy.rb
└── tasks

Capfile Gemfile Gemfile.lock config tasks

./config:
deploy deploy.rb

./config/deploy:
example.com

./config/deploy/example.com:
frontoffice

./config/deploy/example.com/frontoffice:
production.rb

./tasks:

[ayanko]

This is because of stupid default validation for :application variable in capistrano 3.5 that does NOT consider the fact that variable can be a lambda.
https://github.com/capistrano/capistrano/blob/v3.5.0/lib/capistrano/defaults.rb#L1-L9

I suggest two solutions

Solution1. Remove stupid validation

config/deploy.rb

env.variables.send(:validators).delete(:application)
set :application, -> { fetch(:stage).split(':').reverse[1] }

Solution2. Use "static" application variable name

Remove dynamic application variable from config/deploy.rb and define it explicitly in each your stage. E.g.:

config/deploy/frontoffice.rb

set :application, 'frontoffice'

config/deploy/example_com.rb

set :application, 'example_com'

This is not DRY.

[taylorwilliams]

Thanks @ayanko - solution 1 solved it for me.