expected-behavior.rb

>> module DataMapper; class Collection; alias_method :create_or_error, :create; end; end
=> DataMapper::Collection
>> Customer.first.environments.create_or_error
=> #<Environment created_at=nil updated_at=nil id=nil number=nil classification=nil description=nil cluster_id=nil customer_id=1>

wtf.rb

>> module DataMapper; class Collection; alias_method :create_or_error, :create; end; end
=> DataMapper::Collection
>> Customer.first.environments.create_or_error
=> #<Environment created_at=nil updated_at=nil id=nil number=nil classification=nil description=nil cluster_id=nil customer_id=nil>
>> Customer.first.environments.create
=> #<Environment created_at=nil updated_at=nil id=nil number=nil classification=nil description=nil cluster_id=nil customer_id=1>