I am using paperclip to allow user to upload images in my rails application.
I want to rename the images uploaded by appending the current time to their file names before saving them in the database.
Here is my model. The column 'data_file_name' is used to store the image name in the 'images' table.
class Image < ActiveRecord::Base
set_table_name "IMAGES"
set_primary_key "id"
before_create : :rename_image_file
def rename_image_file
extension = File.extname(data_file_name).downcase
self.data_file_name.instance_write(:data_file_name, "#{Time.now.to_i.to_s}#{extension}")
end
belongs_to :book,:foreign_key => :book_id
has_attached_file :data, :path => ":rails_root/public/book_images/:book_id/:style/:basename.:extension",
:url => "http://www.test.org/book_test_editors/book_images/:book_id/:style/:basename.:extension",
:styles => {
:thumbnails => ["150x172#",:jpg],
:large => ["100%", :jpg]
}
end
When I try to upload an image, I get the error message below:
NoMethodError in BooksController#update
undefined method `instance_write' for "DSC02017.JPG":String
Any help?
Note that I am using rails 2.3.5