Dragonfly is a Ruby gem for a framework that enables on-the-fly processing for any content type. It is especially suited to image handling. Its uses range from image thumbnails to standard attachments to on-demand text generation. Use this tag for the Ruby gem, not the deprecated [dragonfly] tag, which is also the name of the Opera debugger (use [opera-dragonfly] for that meaning).
Questions tagged [dragonfly-gem]
142 questions
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Change Dragonfly (Gem) File Permissions (i.e. to 0664)
Dragonfly creates files by default with permissions set to 0644
From https://github.com/markevans/dragonfly/blob/master/lib/dragonfly/temp_object.rb#L116
def to_file(path, opts={})
mode = opts[:mode] || 0644
prepare_path(path) unless…

branch14
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Dragonfly gem, image saving to DB but not appearing on page, "undefined method, 'dragonfly_accessor'" in Rails console
This question has been asked and answered (for that user), but my own experience has varied.
First: Rails 4.0.4, Ruby 2.1.0, Dragonfly gem 1.0.5.
I am using the Dragonfly gem for image uploads on this Rails 4 blog app and am experiencing an issue…

mayormcmatt
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Rails file upload with dragonfly
Hello i have this problem with file upload in rails. I have set dragonfly up and it is working nicely in admin side, however then i try to upload my file (pdf or doc) it passes empty parameter for my file attribute
okey here is the form:
=…

user2945241
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Dragonfly image geometry format not conforming to ImageMagick documentation?
ImageMagick documentation says the following are valid image geometry argument forms:
size General description (actual behavior can vary for different options and settings)
scale% Height and width both scaled by specified…

Bad Request
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Integrate Dragonfly into CKeditor in Rails Admin with Rails 3
I currently have CKeditor working splendid in my Rails Admin.
But now I want to enable image upload so users can insert own images.
I read that this is possible with paperclip and carrierwave but I'm using dragonfly for a lot of things so I don't…

FastSolutions
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Why isn't this rails file attachment (using dragonfly) loading?
I have been at this one for a while and hitting a great wall of fail...
I'm trying to pull some game info from Mochi Media's servers. I have the API hooks in place but when I try to access the file info with Dragonfly I'm getting the following…

dnyce
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uninitialized constant Dragonfly::Server::Serializer
Getting this error on server
NameError
uninitialized constant Dragonfly::Server::Serializer
Using debian+passenger+apache+Rails 3.2 + ruby 1.9.3

Grey
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2 answers
Dragonfly not working in production
I am using Dragonfly with Nginx, unicorn and mini_magick. I am using mem_cache_store in production.
Image upload and display works fine in development environment. But on production it fails with internal server error 500. I cannot see any logs on…

buddy
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2 answers
rake aborted - is a directory/undefined method `downcase' for nil:NilClass
I've a rake task for importing pdf's from my filesystem into GridFS via dragonfly-gem. The task fails with no obvious reason.
I appreciate any help. Thanks!
The rake task:
task :worksafety_files => :environment do
# Importiert Archiv-Dateien via…

patrickkeller
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How to work with Dragonfly's before_serve block to watermark pdf files
I'm trying to serve PDF files that are watermarked with a users email address and timestamp at the time of downloading a file using the dragonfly gem and I'm having a bit of trouble working with the before_serve block. What I'm not able to work out…

JamieD
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Dragonfly across applications; Same image_uid, same host, different Basename
I am trying to port existing users from an old 3.1 rails application to a new rails 4.0 application. I assumed that having the same configuration and same image_uid's would be sufficient to port dragonfly images over. However, Although the base…

k_Dank
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RefineryCMS - Custom Image Engine using Dragonfly for Multiple Resize on upload - MassAssign Error when trying commit uid to database
I've learnt much from the invaluable resource stackoverflow is. I am exceedingly greatful for the many excellent contributions made. Long live open source and those that make it real!
For all the great information here already, I have not been able…

user00000123
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Dragonfly - Uploaded images not displayed
I am using dragonfly with jruby and apache tomcat to upload images. I am trying to display images that i am uplaoding dynamically using profile_picture.thumb('30x30#').url
When I run the app using ruby on rails, the images are shown properly. But…

Sachin Kadam
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DragonFly attachment and BackBone.js
I'm trying to attach an image to a model using BackBone.js, in Rails all works as expected.
But with BackBone.js I don't get how to attach an image and for example show it in the show template.
as you'll see in the Gist I get
None of the functions…

enricostn
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wrong URLs deploying to a subdirectory
in my view I have:
<%= @project.file.name %>
locally, in development, all works fine and I can download the file. But on my VPS in production I get a 404:
[Mon Nov 05 18:28:40 2012] [error] [client…

enricostn
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