Question

I want to modify following code in order to be able to write only the file extension into a database. Now I read the file_content_type, but I need only to know the extension (it doesn’t matter for me that the extension can be changed) and to put it into a database.
upload_file_name has an extension already, but I need to extract it and put it in the same database-table as a new row.

ActiveRecord::Schema.define(:version => 20120731045929) do

  create_table "uploads", :force => true do |t|
    t.string   "upload_file_name"
    t.string   "upload_content_type"
    t.string   "user"
    t.integer  "upload_file_size"
    t.datetime "upload_updated_at"
    t.datetime "created_at",          :null => false
    t.datetime "updated_at",          :null => false
  end

end

And it is possible somehow to save the file_name without an extension?

Answer 1

That looks like it’s from schema.rb.

Don’t touch that one directly.

If you look under /db/migrations you’ll have ruby files with messy looking file names. These are the ruby files that let you configure your database tables.

• First add a column in the database.

In the terminal, run rails generate migration add_file_content_type_to_uploads file_content_type:string

• In Upload.rb model file, add file_content_type to attr_accessible

attr_accessible :file_content_type

• To find the extension, you can use File.extname.

So maybe in your create method of uploads controller

def create
  ...
  @upload.file_content_type = File.extname(params[:upload_file_name])
  ...
end