collection_select and saving a record in ruby on rails

I am trying to learn ruby on rails, writing my own simple app (a to-do list). I now want to add a dropdown menu to select a user to assign the task to.

My schema.rb:

create_table "items", :force => true do |t|
t.text     "description"
t.string   "priority"
t.date     "date"
t.time     "time"
t.datetime "created_at"
t.datetime "updated_at"
t.boolean  "done"
t.string   "name"
end

create_table "users", :force => true do |t|
t.string   "name"
t.datetime "created_at"
t.datetime "updated_at"
end

Now, in my form I have a field with:

<%= f.collection_select(:user, User.all, :id, :name ) %>

It works as far as displaying my users goes. But, when I try to save, I of course get:

ActiveRecord::AssociationTypeMismatch in ItemsController#create

I already have set up the relationship (users has many task, task has one user). What am I missing? Many thanks for any help!

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