Ruby on Rails：使用carrierwave上传多个文件

Question

I've implemented a file upload for my users in my ruby on rails app. Each user can upload an xml file, but now I was trying to do it with multiple files, but I'm having some problems. Can anyone give me an example on how can I upgrade my code?

I already can upload multiple files, and I can see them in the DB, but If I upload more (for example 1) he overwrites the previous files. And how can I list all user files?

EDIT:

I need to upload only one file at each time (without the multiple: true). My objective is to add more files after the user uploaded one .

Answer 1

Documentation excerpt.

Add a column which can store an array. This could be an array column or a JSON column for example. Your choice depends on what your database supports. For example, create a migration like this:

rails g migration add_avatars_to_users avatars:json
rake db:migrate

Open your model file and mount the uploader:

class User < ActiveRecord::Base
  mount_uploaders :avatars, AvatarUploader
end

Make sure your file input fields are set up as multiple file fields. For example in Rails you'll want to do something like this:

<%= form.file_field :avatars, multiple: true %>

Also, make sure your upload controller permits the multiple file upload attribute, pointing to an empty array in a hash. For example:

params.require(:user).permit(:email, :first_name, :last_name, {avatars: []})

Now you can select multiple files in the upload dialog (eg SHIFT+SELECT), and they will automatically be stored when the record is saved.

u = User.new(params[:user])
u.save!
u.avatars[0].url # => '/url/to/file.png'
u.avatars[0].current_path # => 'path/to/file.png'
u.avatars[0].identifier # => 'file.png'