Multiple file upload by carrierwave upload any media one's only one column

 Note Add new column `photo_or_video` in your MODEL

In Controller:

Check type: content_type(image or video)

file = img.original_filename

attachment_type = file.split(".").last

video_or_image = attachment_type.downcase

------------------------------------------

 if video_or_image == "png" || video_or_image == "PNG" || video_or_image == "jpg" || video_or_image == "JPG" || video_or_image == "jpeg" || video_or_image == "JPEG" || video_or_image == "gif" || video_or_image == "GIF"

                video_or_image = "image"

              elsif video_or_image == "mp4" || video_or_image == "MP4" || video_or_image == "ogv" || video_or_image == "OGV" || video_or_image == "ogg" || video_or_image == "OGG" || video_or_image == "mov" || video_or_image == "MOV"

                video_or_image = "video"

              end

-------------------------------------------

And:  User.create(attachment: img, photo_or_video: video_or_image)

==========================================================

Multiple file uploads

Add it to your Gemfile:

      gem 'mini_magick'
      gem 'carrierwave'
      gem 'carrierwave-video-thumbnailer'
Than
      bundle

Install packages: sudo apt install ffmpegthumbnailer

Start off by generating an uploader:

app/uploaders/pictures_uploader.rb

      rails generate uploader pictures

Check out this file for some hints on how you can customize your uploader. It should look something like this:

class PicturesUploader < CarrierWave::Uploader::Base
      storage :file
end

If we want to upload video or image then we will have to use :-

class PicturesUploader < CarrierWave::Uploader::Base
      include CarrierWave::MiniMagick
      include CarrierWave::Video
      include CarrierWave::Video::Thumbnailer

      storage :file
   

     def store_dir
         "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
     end

     version :thumb do
          process thumbnail: [{format: 'jpg', quality: 8, size: 360, logger: Rails.logger}]
          def full_filename for_file
              jpg_name for_file, version_name
          end
     end

     version :medium do
           process thumbnail: [{format: 'jpg', quality: 85, size: 300, logger: Rails.logger}]
          def full_filename for_file
              jpg_name for_file, version_name
          end
     end

    # Create different versions of your uploaded files:
    version :thumb,:if => :is_image? do
          process :resize_to_fit => [740, 300]
    end

    def jpg_name for_file, version_name
         %Q{#{version_name}_#{for_file.chomp(File.extname(for_file))}.jpg}
    end

    protected

    def is_image?(resource_file)

      content_type = resource_file.content_type

      extentions = %w(image/jpeg image/png image/jpg image/gif)

      extentions.include? content_type

    end

    def video?(resource_file)

      content_type = resource_file.content_type

      extentions = %w(video/mp4 video/ogv video/ogg video/mov video/quicktime audio/ogg)

      extentions.include? content_type

    end

end

Add a string column to the model you want to mount the uploader by creating a migration:

     rails g migration add_vimeo_file_to_users attachment:string
     rake db:migrate

Open your model file and mount the uploader:

class User < ActiveRecord::Base
     mount_uploader :attachment:, VimeoUploader
end

===================================================

https://railsblogs.rohityadav.in/2017/11/uploading-any-media-file-with-carrier.html

Completed conditional versioning in carrierwave based on extension(image or video) with thumbinal

Add gem: 

gem 'mini_magick'

-----------------------------------------------------------------------

Added on uploader file: 

include CarrierWave::MiniMagick

version :thumb, :if => :is_image?  do

    process resize_to_fit: [450, 400]

  end

protected

  def is_image?(resource_file)

    content_type = resource_file.content_type

    extentions = %w(image/jpeg image/png image/jpg image/gif)

    extentions.include? content_type

  end