Rails paperclip unique image - ruby-on-rails

Question

Hi im looking forward to fix this unique image name issue: when a user upload an image (every user have it own folder), and the image exists already,, im getting thie message.
Errno::EACCES in PlayerStepsController#update
Permission denied - /srv/www/myfootballproject.com/mfp/public/assets/people/14/original/chepo.jpg
Rails.root: /srv/www/myfootballproject.com/mfp
Application Trace | Framework Trace | Full Trace
app/controllers/player_steps_controller.rb:30:in `update'
Request
I look into stackoverflow, and first i read about setting the userid for folders this minimize the probs of same name, also i try to randomize, but this is not working at all, i get no errors neither a randomize name for image..
here is the part of the model doing this.
has_attached_file :avatar, :styles => { :profile => "300x300", :thumb => "100x100#"},
:url => "/assets/people/:id/:style/:basename.:extension",
:path => ":rails_root/public/assets/people/:id/:style/:basename.:extension"
before_create :randomize_file_name
private
def randomize_file_name
extension = File.extname(image_file_name).downcase
self.image.instance_write(:file_name, "#{ActiveSupport::SecureRandom.hex(16)}#{extension}")
end
here is the model (complete)
class Player < ActiveRecord::Base
belongs_to :user
has_many :clubs
has_many :links
has_many :references
has_many :achievements
has_many :citizens
has_and_belongs_to_many :languages
has_and_belongs_to_many :selections
accepts_nested_attributes_for :clubs, :allow_destroy => true, :reject_if => proc { |attributes| attributes['name'].blank? }
accepts_nested_attributes_for :links, :allow_destroy => true, :reject_if => proc { |attributes| attributes['url'].blank? }
accepts_nested_attributes_for :references, :allow_destroy => true, :reject_if => proc { |attributes| attributes['name'].blank? }
accepts_nested_attributes_for :achievements, :allow_destroy => true, :reject_if => proc { |attributes| attributes['name'].blank? }
accepts_nested_attributes_for :citizens, :allow_destroy => true, :reject_if => proc { }
attr_accessible :name,
:lastname,
:birthday,
:height,
:height_measure,
:weight,
:weight_measure,
:inches,
:city,
:birthplace,
:other_languages,
:cp,
:phone,
:cellphone,
:web_page,
:game_status,
:club,
:actual_club,
:actual_country_club,
:actual_division_club,
:actual_contract_expiration_club,
:last_club,
:last_country_club,
:last_division_club,
:last_contract_expiration_club,
:position,
:alternative_position,
:dominant_leg,
#normal player
:short_passes,
:long_passes,
:shots_half_distance,
:shots_long_distance,
:ball_habilities,
:offensive_capability,
:ball_driving,
:defense_capability,
:dribbling,
:velocity,
:vision_field,
:movements_wothout_ball,
:recovery_ball,
:head_ball,
:lidership,
:teamwork,
#goalkeeper
:air_game,
:clearance_technique, #técnica de despeje
:ball_keep, #atajes
:flexibility, #flexibilidad
:penalty_keep, #atajar penales
:achique,
:defense_communication,
:foot_game,
:velocity_reaction, #reflejos
:area_domination,
:goalkeep_teamwork,
:goalkeep_lidership,
:strenghts,
:weaknesses,
:aditional_information,
:active,
:clubs_attributes,
:links_attributes,
:references_attributes,
:achievements_attributes,
:citizens_attributes,
:avatar_file_name,
:avatar_content_type,
:avatar_file_size,
:avatar,
:language_ids,
:selection_ids
POSITIONS = %w{
goalkeeper
defense
medium
offensive
}
LEG = %w{
left
right
both
}
# altura
HEIGHT = (1..200).to_a
INCH = (1..11).to_a
# peso
WEIGHT = (1..300).to_a
HEIGHT_MEASURE = %w{
cms
pies
}
WEIGHT_MEASURE = %w{
kgs
lbs
}
has_attached_file :avatar, :styles => { :profile => "300x300", :thumb => "100x100#"},
:url => "/assets/people/:id/:style/:basename.:extension",
:path => ":rails_root/public/assets/people/:id/:style/:basename.:extension"
before_create :randomize_file_name
private
def randomize_file_name
extension = File.extname(image_file_name).downcase
self.image.instance_write(:file_name, "#{ActiveSupport::SecureRandom.hex(16)}#{extension}")
end
validates_attachment_size :avatar, :less_than => 2.megabytes # Solo aceptar imágenes menores a 2 Mb.
validates_attachment_content_type :avatar, :content_type => ['image/jpeg', 'image/pjpeg', 'image/png', 'image/x-png', 'image/gif']
def defeated?
t = Time.now - created_at
mm, ss = t.divmod(60)
hh, mm = mm.divmod(60)
dd, hh = hh.divmod(24)
dd > 180 ? true : false
end
end
Everything is working perfect, i can upload images (As long as they do not exist in server)
Thanks