Copy model instances in Rails

a wrong way to do this would be:

f2 = Foo.new( f1.attributes )     # wrong!
f2.save                           # wrong!

or in one line, but still wrong:

f2 = Foo.create( f1.attributes )  # wrong!

see comments for details

This is what ActiveRecord::Base#clone method is for:

@bar = @foo.clone

@bar.save

You can make duplicate record in rails like

@bar = @foo.dup
@bar.save!

As per the following question, if you are using Rails >= 3.1, you can use object.dup :

What is the easiest way to duplicate an activerecord record?