Ruby on Rails

I make two classes job and step, its associate with
accepts_nested_attributes_for, has_many and belongs_to.
liks:

class Job < ActiveRecord::Base
 has_many :steps, :dependent => :destroy
 accepts_nested_attributes_for :steps

 validate :job_validate , :on => :create
 def job_validate
   p "job validate"
 end
end


class Step < ActiveRecord::Base
 belongs_to :job

# here just test if called this validates_presence_of
 validates_presence_of :name , :if => Proc.new { |step| p " step name
validates_presence_of" }
 validate_on_create :step_validate

 private
 def step_validate
   p self
   p "step  validate"
 end
end


Tow migtations links:
class CreateJobs < ActiveRecord::Migration
 def self.up
   create_table :jobs do |t|
     t.string :name

     t.timestamps
   end
 end

 def self.down
   drop_table :jobs
 end
end


class CreateSteps < ActiveRecord::Migration
 def self.up
   create_table :steps do |t|
     t.string :name
     t.references :job
     t.timestamps
   end
 end

 def self.down
   drop_table :steps
 end
end



My problem is that when i testing them in script/console as follow:
shell:$ script/console
Loading shelllocal environment (Rails 2.3.5)
>> job = Job.new
=> #<Job id: nil, name: nil, created_at: nil, updated_at: nil>
>> job.steps.build
=> #<Step id: nil, name: nil, job_id: nil, created_at: nil,
updated_at: nil>
>> job.save
" step name validates_presence_of"
#<Step id: nil, name: nil, job_id: nil, created_at: nil, updated_at:
nil>
"step  validate"
" step name validates_presence_of"
#<Step id: nil, name: nil, job_id: nil, created_at: nil, updated_at:
nil>
"step  validate"
"job validate"
=> true
>>


As you see the "step  validate" called two times.I think  "step
validate" be called once is correct.  I don't know why its called tow
times? Who can help me?

thank you !

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