CODEWITHSUNDEEP
ruby-on-rails-3
samchoi
samchoi

Reputation: 63

Ruby Dynamic Nested Namespacing

Given two model that are namespaced as 

    SomeModule::V1::Api 
    SomeModule::V2::Api

I want to make a call in my controller like:

    api = SomeModule::V1::Api

but have the "V1" portion be a variable, so that I can swap between versions.

Any ideas on how to make that happen?

Upvotes: 0

Views: 47

Answers (2)

Chris Heald
Chris Heald

Reputation: 62668

If you don't want to use #constantize (which is a part of ActiveSupport), you can do it with Plain Old Ruby:

version = "V1"
SomeModule.const_get(version).const_get("Api")
# => SomeModule::V1::Api

Upvotes: 1

Dave Newton
Dave Newton

Reputation: 160211

v = 'V1'
"SomeModule::#{v}::Api".constantize
=> SomeModule::V1::Api

Example:

module SomeModule
  module V1; end
  module V2; end
end

class SomeModule::V1::Api
  def self.foo; 'V1 foo'; end
end

class SomeModule::V2::Api
  def self.foo; 'V2 foo'; end
end

v = 'V1'
puts "SomeModule::#{v}::Api".constantize.foo
=> V1 foo
v = 'V2'
puts "SomeModule::#{v}::Api".constantize.foo
=> V2 foo

Upvotes: 1

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