Carrierwave How to Get the File Extension

Carrierwave how to get the file extension

Determine file extension (I suppose a name for mounted uploader is 'file'):

file = my_model.file.url
extension = my_model.file.file.extension.downcase

Then prepare mime and disposition vars:

disposition = 'attachment'
mime = MIME::Types.type_for(file).first.content_type

if %w{jpg png jpg gif bmp}.include?(extension) or extension == "pdf"
  disposition = 'inline'
end

(add other extensions if you want).

And then send the file:

send_file file, :type => mime, :disposition => disposition

Get file name of Carrierwave upload in rails controller

The solution was to get the filename from the carrierwave file like this:

  def create
    @photo = Photo.new(params[:photo])
    @photo.user_id = current_user.id

    @photo.name =  @photo.image.file.filename if @photo.name == ""

    respond_to do |format|
      if @photo.save
        format.html { redirect_to @photo, notice: 'Photo was successfully created.' }
        format.json { render action: 'show', status: :created, location: @photo }
      else
        format.html { render action: 'new' }
        format.json { render json: @photo.errors, status: :unprocessable_entity }
      end
    end
  end

CarrierWave / MiniMagick not updating file extension after convert

I have solved this issue using version name customization. Note that I have chosen not to convert the original file, which is a bit different from my initial approach.

Here's a snippet of the code I've implemented:

class PhotoUploader < CarrierWave::Uploader::Base
  include CarrierWave::MiniMagick

  version :large do
    process resize_to_fit: [2000, 2000]
    process convert: 'jpg'

    def full_filename(for_file = model.file_name.file)
      "large_#{for_file.sub('png', 'jpg')}"
    end
  end

  version :thumb do
    process resize_to_fit: [500, nil]
    process convert: 'jpg'

    def full_filename(for_file = model.file_name.file)
      "thumb_#{for_file.sub('png', 'jpg')}"
    end
  end
end

How to detect a file type in a Rails app?

I guess (is not a good thing to let other people guess what you should already provided in your question) you have a model Document and your uploader is media, something like this:

class Document < ActiveRecord::Base
  mount_uploader :media, MediaUploader
end

If this is the case, for each document you get the extension (document.media.file.extension.downcase) and compare it with 'jpg', 'jpeg', 'png'

<% document.each do |doc| %>
  <% if ['jpg', 'jpeg', 'png'].include?(document.media.file.extension.downcase) %>
    <%= link_to image_tag(doc.media_url(:thumb)) %>
  <% else %>
    <%= link_to doc.media.path %> # This link downloading the file 
  <% end %>
<% end %>

Carrierwave can give you the content type if you want it by using:

document.media.content_type # this returns image/png for a png file ...

Edit:

I think a better way is to check it like this (it's cleaner):

<% document.each do |doc| %>
  <% if document.media.content_type =~ /image/ %>
    <%= link_to image_tag(doc.media_url(:thumb)) %>
  <% else %>
    <%= link_to doc.media.path %> # This link downloading the file 
  <% end %>
<% end %>

Carrierwave Versions depending on the file extension

Try with something like:

  version :thumb, :if => :is_gif?

  protected
  def is_gif?(picture)
    picture.extension.to_s.downcase == 'gif'
  end

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