Adding index :unique to a column in ruby on rails via generate migration

Question

I know that i can touch a migration and add

add_index :table_name, :column_name, :unique => true

But how is the right rails migration command to generate this?

rails g migration add_index_to_column_name :column_name, :unique => true

Is that right?

In my special example I have a table customers

  t.integer :customerID
  t.string :surname
  t.string :first_name
  t.string :phone

an i want to set the customerID to unique. Tried

rails g migration AddIndexToCustomers :customerID, :unique => true 

But if i look to my migration file after this, it dont look right see this:

def change
    add_column :customers, :, :customerID,
    add_column :customers, :, :unique
    add_column :customers, :=, :string
  end

Any idea or suggestion?

Answer 1

Starting from Rails 3.2 you able to use:

 rails g migration add_index_to_table_name column_name:type:uniq

• as normal, type defaults to string

Rails guide example

 rails g scaffold Post title:string:index author:uniq price:decimal{7,2}

Answer to the question

rails g migration add_index_to_customers customerID:integer:uniq