Question

I am trying to save 2 rows, the 2nd row based on the 1st row:

user = User.new(....)
user.save!

user.id = nil
user.name = "different name"
user.save!

This doesn’t create a 2nd row, what should I do?

Answer 1

The problem is that Rails thinks you’re trying to change an instance that is already saved to the database, rather than create a new one. What you want to do is clone the original record, and it should work. Here are the Rails docs on using clone.

# First instance
user = User.create(...params...)

# New instance (no need to set id = nil)
user2 = user.clone
user2.name = "different name"
user2.save!