postgresql - Add_Index() Error using Rails ,PostGres and Windows xp -

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i'm trying add index models, keep getting error.

pg:error error:column "user_id" not exist :create index "index_users_on_user_id" on "users" ("user_id")

class createusers < activerecord::migration   def self.up     create_table :users |t|       t.references :role       t.references :carrier       t.string "first_name"       t.string "last_name"       t.string "user_name"       t.string "hashed_password"       t.string "user_salt"       t.string "telephone"        t.timestamps     end     add_index("users", "user_id")     add_index("users", "role_id")     add_index("users", "user_name")   end    def self.down     drop_table :users   end end

you don't have anywhere column user_id in migration. automagical column rails creates called 'id'.


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