[rails-development] Question about migration syntax / behavior

[alibaba82]

Hello,
I am a newbie so anyones help is appreciated.

I notice that in a few lessons (example 3.3 --> Add email field to the
users table)
we just create a migration with these args 'AddEmailField
email:string'

This migrations generates this ruby code
class AddEmailField < ActiveRecord::Migration
  def self.up
    add_column :users, :email, :string
  end

  def self.down
    remove_column :users, :email
  end
end

My questions is how does the migration know what model to use. How did
':users' magically appear in add_column :users, :email, :string

Thanks

Ali

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