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

i know can touch migration , add

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

but how right rails migration command generate this?

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

is right?

in special example have table customers

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

an want set customerid unique. tried

rails g migration addindextocustomers :customerid, :unique => true

but if migration file after this, dont right see this:

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

any idea or suggestion?

starting rails 3.2 able use:

 rails g migration add_index_to_table_name column_name:uniq

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

upd i'm sorry. default type if don't pass string. can pass type yourself.

column_name:type:uniq

thus example should looks like:

rails g migration add_index_to_customers customerid:integer:uniq

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