Creating table entry with params hash and associated model(s) params hash

Question

i want to do something like this:

user.items << Item.new(params[:item] , :computer => Computer.new(params[:computer] , :laptop => Laptop.new(params[:laptop])))

But this generates an error "wrong number of arguments (2 for 1)"!

Answer 1

What you're doing is actually interpreted as

Item.new(params[:item] , {
  :computer => Computer.new(params[:computer], { 
    :laptop => Laptop.new(params[:laptop])
  })
})

#new expects a hash attribute, and you're giving it two hashes. One solution would be to merge the hashes using Hash#merge.