Question

when you generate a model in rails, and it creates a skeleton migration file.

in has

create_table :model_names do |t|
  t.string :name
  t.string :address
  t.timestamps
end

What object is being passed in as t.

When I read this part of the book I wondered what t was, but it never explained. Then later I learned in the form_for helper which passes an |f| into its block, that the f was a FormBuilder object, and this made me come here and ask. I mean, it obviously isn’t important, but it bugs me when knowledge is missing.

Answer 1

the answer is ActiveRecord::ConnectionAdapters::TableDefinition
how do I know?

class CreateFoos < ActiveRecord::Migration
  def change
    create_table :foos do |t|
      puts "the answer is: " + t.class.to_s
      t.string :foo

      t.timestamps
    end
  end
end