[Rails] whats wrong with this migration

Hello,

I try to add a column named id_category to my database table berichten.
So I have this :

class Bericht < ActiveRecord::Migration
  def up
    add_column :berichten do [t]
      t.column :name, 'id_category'
  end
  end
  def down
  end
end

But I get wrong number ( 1 of 3 ) error message.

Can anyone tell me what's wrong here so I can learn to write my own migrations.

Roelof

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