So my deploy.rb script in capistrano starts like this, which I guess is pretty normal:
require 'capistrano/ext/multistage'
require 'nokogiri'
require 'curb'
require 'json'
# override capistrano defaults
set :use_sudo, false
set :normalize_asset_timestamps, false
# some constant of mine
set :my_constant, "foo_bar"
Later, I can access my constant in functions or tasks within namespaces, like:
namespace :mycompany do
def some_function()
run "some_command #{my_constant}"
end
desc <<-DESC
some task description
DESC
task :some_task do
run "some_command #{my_constant}"
end
end
However, if I use the constant in a class, like this:
namespace :mycompany do
class SomeClass
def self.some_static_method()
run "some_command #{my_constant}"
end
end
end
It fails with:
/config/deploy.rb:120:in `some_static_method': undefined local variable or method `my_constant' for #<Class:0x000000026234f8>::SomeClass (NameError)
What am I doing wrong?? Thanks
The deploy.rb file is instance_evaled, this means it's being executed inside the context of an object, and as such anything you declare will be available until you leave that context. As soon as you create a class that provides a new context.
In order to access the original context you have to pass the object (self) to the class method.
namespace :mycompany do
class SomeClass
def self.some_static_method(cap)
run "some_command #{cap.fetch(:my_constant)}"
end
end
SomeClass.some_static_method(self)
end
Although I really don't understand why you are declaring a class like this, it's an odd place for it.
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