Fix multiple version definitions for path versioning

Issue ruby-grape#1400

* New spec for this case

* Update CHANGELOG

CHANGELOG.md

@@ -15,6 +15,7 @@
 * [#1365](https://github.com/ruby-grape/grape/pull/1365): Fix finding exception handler in error middleware - [@ktimothy](https://github.com/ktimothy).
 * [#1380](https://github.com/ruby-grape/grape/pull/1380): Fix `allow_blank: false` for `Time` attributes with valid values causes `NoMethodError` - [@ipkes](https://github.com/ipkes).
 * [#1384](https://github.com/ruby-grape/grape/pull/1384): Fix parameter validation with an empty optional nested `Array` - [@ipkes](https://github.com/ipkes).
+* [#1414](https://github.com/ruby-grape/grape/pull/1414): Fix multiple version definitions for path versioning - [@304](https://github.com/304).
 
 0.16.2 (4/12/2016)
 ==================

lib/grape/dsl/routing.rb

@@ -28,6 +28,7 @@ module ClassMethods
  #
  def version(*args, &block)
  if args.any?
+ args.flatten!
  options = args.extract_options!
  options = options.reverse_merge(using: :path)
 

spec/grape/api_spec.rb

@@ -301,8 +301,10 @@ def subject.enable_root_route!
  end
 
  describe 'path versioned APIs' do
+ let(:version) { 'v1' }
+
  before do
- subject.version 'v1', using: :path
+ subject.version version, using: :path
  subject.enable_root_route!
  end
 
@@ -313,6 +315,13 @@ def subject.enable_root_route!
  it 'with a format' do
  get '/v1/.json'
  end
+
+ context 'when array of versions provided' do
+ let(:version) { %w(v1 v2) }
+
+ it { versioned_get '/', 'v1', using: :path }
+ it { versioned_get '/', 'v2', using: :path }
+ end
  end
 
  it 'header versioned APIs' do