Gemfile in mongoid-archivable-1.7.0 vs Gemfile in mongoid-archivable-1.7.1

@@ -1,4 +1,11 @@
 source 'https://rubygems.org'
 
 # Specify your gem's dependencies in mongoid-archivable.gemspec
 gemspec
+
+case version = ENV['MONGOID_VERSION'] || '~> 7.0'
+when /7/ then gem 'mongoid', '~> 7.0'
+when /6/ then gem 'mongoid', '~> 6.0'
+when /5/ then gem 'mongoid', '~> 5.1'
+else gem 'mongoid', version
+end