postgresql - Empty string as default value for enum type column instead of nil in Rails -

the problem i'm receiving empty string instead of nil default value enum column in postgresql database, while creating new activerecord object. here more information.

my migration:

class createtickets < activerecord::migration   def change     execute <<-sql       create type ticket_status enum ('submitted', 'open', 'closed');     sql      create_table :tickets |t|       t.string :name       t.column :status, :ticket_status        t.timestamps null: false     end   end end 

my model:

class ticket < activerecord::base   status = {     submitted:  'submitted',     open:       'open',     closed:     'closed'   }    validates :status, inclusion: { in: ticket::status.values }, allow_nil: true end 

my goal allow nil value in database table, when i'm trying create new object, i'm receiving "not included in list error":

2.2.0 :005 >   ticket.create!    (0.8ms)  begin    (0.5ms)  rollback activerecord::recordinvalid: validation failed: status not included in list  

this happens because new object created empty string default value in status column, while other columns correct nil values:

2.2.0 :010 >   ticket.new  => #<ticket id: nil, name: nil, status: "", created_at: nil, updated_at: nil>  

one more condition here, want use native postgresql enum type, instead of integer mapping.

there allow_blank option.

validates :status, inclusion: { in: ticket::status.values }, allow_blank: true 

http://edgeguides.rubyonrails.org/active_record_validations.html#allow-blank

update: work, should add empty string enum:

create type ticket_status enum ('', 'submitted', 'open', 'closed');