Hai Rick,

   I have made the change you hav told. Still the join table is not been 
populated.
These are my migration data.Is there any problem with this?
.....................................................
class CreateNewStations < ActiveRecord::Migration
  def self.up
    create_table :stations do |t|
      t.string :name
      t.integer :district_id
      t.string :MDT_id
      t.string :sim_no
      t.decimal :longitude,  :precision=>10, :scale=>6
      t.decimal :latitude,   :precision=>10, :scale=>6
      t.integer :user_id
      t.timestamps

    end
    create_table :stations_users, :id => false do |t|
      t.integer :user_id
      t.integer :station_id
    end
  end

  def self.down
   drop_table :stations_users rescue nil
    drop_table :stations
  end
end
...........................................................

class CreateUsers < ActiveRecord::Migration
  def self.up
    create_table :users do |t|
      t.string :name
      t.string :username
      t.string :hashed_password
      t.string :salt
      t.string :status
      t.string :phone
      t.string :email
      t.integer :station_id
      t.timestamps
    end
  end

  def self.down
    drop_table :users
  end
end

Thanks and Regards,
Veena
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