migration.rb

class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users, id: false do |t|
      t.primary_key   :id, :uuid, :default => 'uuid_generate_v1()'
      t.string        :first_name
      t.string        :last_name
      t.string        :email
      t.string        :mobile_number
      t.string        :locality
      t.string        :city
      t.string        :address
      t.string        :blood_group
      t.string        :emeregency_number
      t.string        :user_type
      t.integer       :dob
      t.string        :password
      t.string        :access_token
      t.uuid          :parent_id
      t.timestamps
    end
  end
end

trace

==  CreateUsers: migrating ====================================================
-- create_table(:users, {:id=>false})
rake aborted!
An error has occurred, this and all later migrations canceled:

undefined method `uuid' for #<ActiveRecord::ConnectionAdapters::TableDefinition:0xaae76ff>/home/abhishek/mine/code/infocus/backend-ror/db/migrate/20130809161249_create_users.rb:18:in `change'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:184:in `create_table'
org/jruby/RubyBasicObject.java:1715:in `__send__'
org/jruby/RubyKernel.java:2217:in `send'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:625:in `method_missing'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:597:in `say_with_time'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:597:in `say_with_time'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:617:in `method_missing'
/home/abhishek/mine/code/infocus/backend-ror/db/migrate/20130809161249_create_users.rb:3:in `change'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:571:in `exec_migration'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:555:in `migrate'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:554:in `migrate'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:294:in `with_connection'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:553:in `migrate'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:709:in `migrate'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:959:in `execute_migration_in_transaction'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:1005:in `ddl_transaction'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/database_statements.rb:202:in `transaction'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/database_statements.rb:210:in `within_new_transaction'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/database_statements.rb:202:in `transaction'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/transactions.rb:209:in `transaction'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:1005:in `ddl_transaction'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:958:in `execute_migration_in_transaction'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:920:in `migrate'
org/jruby/RubyArray.java:1617:in `each'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:916:in `migrate'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:764:in `up'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/migration.rb:742:in `migrate'
/home/abhishek/.rvm/gems/jruby-1.7.4/gems/activerecord-4.0.0/lib/active_record/railties/databases.rake:42:in `(root)'
org/jruby/RubyProc.java:255:in `call'
org/jruby/RubyArray.java:1617:in `each'
org/jruby/RubyArray.java:1617:in `each'
org/jruby/RubyKernel.java:1073:in `load'
Tasks: TOP => db:migrate

user.rb

class User
  validates :first_name,:last_name,:email,:mobile,    presence:   true
  validates :locality,:city,                          presence:   true
  validates :email                                    uniqueness: true
  
  belongs_to :parent,   :inverse_of => :children, class_name: "User"
  has_many   :children, :inverse_of => :parent,   class_name: "User"
  
  before_create :generate_access_token

  :first_name,        type: String
  :last_name,         type: String
  :email,             type: String
  :mobile_number,     type: String
  :locality,          type: String
  :city,              type: String
  :address,           type: String
  :blood_group,       type: String
  :emergency_number,  type: String
  :user_type,         type: String
  :dob,               type: Integer  
  :password,          type: String
  :access_token       type: String



private
  
  def generate_access_token    
      access_token = SecureRandom.hex
      until User.find_by_access_token(access_token) != nil
        access_token = SecureRandom.hex
      end
      self.access_token = access_token
  end
end