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Dragonfly

Dragonfly is a Rack framework for on-the-fly image handling.

Ideal for using with Ruby on Rails (2.3 and 3), Sinatra and all that gubbins.

However, Dragonfly is NOT JUST FOR RAILS, and NOT JUST FOR IMAGES!!

For the lazy Rails user...

Gemfile:

gem 'rack-cache', :require => 'rack/cache'
gem 'dragonfly', '~>0.9.4'

Initializer (e.g. config/initializers/dragonfly.rb):

require 'dragonfly/rails/images'

Migration:

add_column :albums, :cover_image_uid, :string
add_column :albums, :cover_image_name, :string # Optional - only if you want urls
# to end with the original filename

Model:

class Album < ActiveRecord::Base
image_accessor :cover_image # 'image_accessor' is provided by Dragonfly
# this defines a reader/writer for cover_image
# ...
end

View (for uploading via a file field):

<% form_for @album, :html => {:multipart => true} do |f| %>
...
<%= f.file_field :cover_image %>
...
<% end %>

NB: REMEMBER THE MULTIPART BIT!!!

You can avoid having to re-upload when validations fail with

 <%= f.hidden_field :retained_cover_image %>

remove the attachment with

 <%= f.check_box :remove_cover_image %>

assign from some other url with

 <%= f.text_field :cover_image_url %>

and display a thumbnail (on the upload form) with

 <%= image_tag @album.cover_image.thumb('100x100').url if @album.cover_image_uid %>

View (to display):

<%= image_tag @album.cover_image.url %>
<%= image_tag @album.cover_image.thumb('400x200#').url %>
<%= image_tag @album.cover_image.jpg.url %>
<%= image_tag @album.cover_image.process(:greyscale).encode(:tiff).url %>
...etc.

The above relies on imagemagick being installed. Dragonfly doesn't depend on it per se, but the default configuration 'dragonfly/rails/images' uses it. For alternative configurations, see below.

If using Capistrano with the above, you probably will want to keep the cache between deploys, so in deploy.rb:

namespace :dragonfly do
desc "Symlink the Rack::Cache files"
task :symlink, :roles => [:app] do
run "mkdir -p #{shared_path}/tmp/dragonfly && ln -nfs #{shared_path}/tmp/dragonfly #{release_path}/tmp/dragonfly"
end
end
after 'deploy:update_code', 'dragonfly:symlink'

Sinatra, CouchDB, Mongo, Rack, S3, custom storage, processing, and more...

Dragonfly is not just for Rails - it's primarily a Rack app, so you can use it as a standalone app, or with Sinatra, Merb, etc.

It's highly customizable, and works with any data type (not just images).

For more info, consult the DOCUMENTATION

Add-ons

For third-party add-ons, see the Add-ons wiki

Issues

Please use the github issue tracker if you have any issues.

Suggestions/Questions

Google group dragonfly-users

Credits

Copyright

Copyright (c) 2009-2010 Mark Evans. See LICENSE for details.

About

A Ruby Rack-based gem for on-the-fly processing - suitable for image uploading in Rails, Sinatra and much more!

markevans.github.com/dragonfly/

Resources

Readme
License
Activity
Custom properties

Stars

1 star

Watchers

0 watching

Forks

1 fork
Report repository

Releases

Packages

Used by

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Dragonfly
Dragonfly is a Rack framework for on-the-fly image handling.
Ideal for using with Ruby on Rails (2.3 and 3), Sinatra and all that gubbins.
However, Dragonfly is NOT JUST FOR RAILS, and NOT JUST FOR IMAGES!!
For the lazy Rails user...
Gemfile:
gem 'rack-cache', :require => 'rack/cache'
gem 'dragonfly', '~>0.9.4'

Initializer (e.g. config/initializers/dragonfly.rb):
require 'dragonfly/rails/images'

Migration:
add_column :albums, :cover_image_uid, :string
add_column :albums, :cover_image_name, :string # Optional - only if you want urls
# to end with the original filename

Model:
class Album < ActiveRecord::Base
image_accessor :cover_image # 'image_accessor' is provided by Dragonfly
# this defines a reader/writer for cover_image
# ...
end

View (for uploading via a file field):
<% form_for @album, :html => {:multipart => true} do |f| %>
...
<%= f.file_field :cover_image %>
...
<% end %>

NB: REMEMBER THE MULTIPART BIT!!!
You can avoid having to re-upload when validations fail with
 <%= f.hidden_field :retained_cover_image %>

remove the attachment with
 <%= f.check_box :remove_cover_image %>

assign from some other url with
 <%= f.text_field :cover_image_url %>

and display a thumbnail (on the upload form) with
 <%= image_tag @album.cover_image.thumb('100x100').url if @album.cover_image_uid %>

View (to display):
<%= image_tag @album.cover_image.url %>
<%= image_tag @album.cover_image.thumb('400x200#').url %>
<%= image_tag @album.cover_image.jpg.url %>
<%= image_tag @album.cover_image.process(:greyscale).encode(:tiff).url %>
...etc.

The above relies on imagemagick being installed. Dragonfly doesn't depend on it per se, but the default configuration 'dragonfly/rails/images'
uses it. For alternative configurations, see below.
If using Capistrano with the above, you probably will want to keep the cache between deploys, so in deploy.rb:
namespace :dragonfly do
desc "Symlink the Rack::Cache files"
task :symlink, :roles => [:app] do
run "mkdir -p #{shared_path}/tmp/dragonfly && ln -nfs #{shared_path}/tmp/dragonfly #{release_path}/tmp/dragonfly"
end
end
after 'deploy:update_code', 'dragonfly:symlink'

Sinatra, CouchDB, Mongo, Rack, S3, custom storage, processing, and more...
Dragonfly is not just for Rails - it's primarily a Rack app, so you can use it as a standalone app, or with Sinatra, Merb, etc.
It's highly customizable, and works with any data type (not just images).
For more info, consult the DOCUMENTATION
Add-ons
For third-party add-ons, see the Add-ons wiki
Issues
Please use the github issue tracker if you have any issues.
Suggestions/Questions
Google group dragonfly-users
Credits
Copyright
Copyright (c) 2009-2010 Mark Evans. See LICENSE for details.
About
A Ruby Rack-based gem for on-the-fly processing - suitable for image uploading in Rails, Sinatra and much more!
markevans.github.com/dragonfly/
Resources
Readme
License
Activity
Custom properties
Stars
1 star
Watchers
0 watching
Forks
1 fork
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Dragonfly
Dragonfly is a Rack framework for on-the-fly image handling.
Ideal for using with Ruby on Rails (2.3 and 3), Sinatra and all that gubbins.
However, Dragonfly is NOT JUST FOR RAILS, and NOT JUST FOR IMAGES!!
For the lazy Rails user...
Gemfile:
gem 'rack-cache', :require => 'rack/cache'
gem 'dragonfly', '~>0.9.4'

Initializer (e.g. config/initializers/dragonfly.rb):
require 'dragonfly/rails/images'

Migration:
add_column :albums, :cover_image_uid, :string
add_column :albums, :cover_image_name, :string # Optional - only if you want urls
# to end with the original filename

Model:
class Album < ActiveRecord::Base
image_accessor :cover_image # 'image_accessor' is provided by Dragonfly
# this defines a reader/writer for cover_image
# ...
end

View (for uploading via a file field):
<% form_for @album, :html => {:multipart => true} do |f| %>
...
<%= f.file_field :cover_image %>
...
<% end %>

NB: REMEMBER THE MULTIPART BIT!!!
You can avoid having to re-upload when validations fail with
 <%= f.hidden_field :retained_cover_image %>

remove the attachment with
 <%= f.check_box :remove_cover_image %>

assign from some other url with
 <%= f.text_field :cover_image_url %>

and display a thumbnail (on the upload form) with
 <%= image_tag @album.cover_image.thumb('100x100').url if @album.cover_image_uid %>

View (to display):
<%= image_tag @album.cover_image.url %>
<%= image_tag @album.cover_image.thumb('400x200#').url %>
<%= image_tag @album.cover_image.jpg.url %>
<%= image_tag @album.cover_image.process(:greyscale).encode(:tiff).url %>
...etc.

The above relies on imagemagick being installed. Dragonfly doesn't depend on it per se, but the default configuration 'dragonfly/rails/images'
uses it. For alternative configurations, see below.
If using Capistrano with the above, you probably will want to keep the cache between deploys, so in deploy.rb:
namespace :dragonfly do
desc "Symlink the Rack::Cache files"
task :symlink, :roles => [:app] do
run "mkdir -p #{shared_path}/tmp/dragonfly && ln -nfs #{shared_path}/tmp/dragonfly #{release_path}/tmp/dragonfly"
end
end
after 'deploy:update_code', 'dragonfly:symlink'

Sinatra, CouchDB, Mongo, Rack, S3, custom storage, processing, and more...
Dragonfly is not just for Rails - it's primarily a Rack app, so you can use it as a standalone app, or with Sinatra, Merb, etc.
It's highly customizable, and works with any data type (not just images).
For more info, consult the DOCUMENTATION
Add-ons
For third-party add-ons, see the Add-ons wiki
Issues
Please use the github issue tracker if you have any issues.
Suggestions/Questions
Google group dragonfly-users
Credits
Copyright
Copyright (c) 2009-2010 Mark Evans. See LICENSE for details.
About
A Ruby Rack-based gem for on-the-fly processing - suitable for image uploading in Rails, Sinatra and much more!
markevans.github.com/dragonfly/
Resources
Readme
License
Activity
Custom properties
Stars
1 star
Watchers
0 watching
Forks
1 fork
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Dragonfly
Dragonfly is a Rack framework for on-the-fly image handling.
Ideal for using with Ruby on Rails (2.3 and 3), Sinatra and all that gubbins.
However, Dragonfly is NOT JUST FOR RAILS, and NOT JUST FOR IMAGES!!
For the lazy Rails user...
Gemfile:
gem 'rack-cache', :require => 'rack/cache'
gem 'dragonfly', '~>0.9.4'

Initializer (e.g. config/initializers/dragonfly.rb):
require 'dragonfly/rails/images'

Migration:
add_column :albums, :cover_image_uid, :string
add_column :albums, :cover_image_name, :string # Optional - only if you want urls
# to end with the original filename

Model:
class Album < ActiveRecord::Base
image_accessor :cover_image # 'image_accessor' is provided by Dragonfly
# this defines a reader/writer for cover_image
# ...
end

View (for uploading via a file field):
<% form_for @album, :html => {:multipart => true} do |f| %>
...
<%= f.file_field :cover_image %>
...
<% end %>

NB: REMEMBER THE MULTIPART BIT!!!
You can avoid having to re-upload when validations fail with
 <%= f.hidden_field :retained_cover_image %>

remove the attachment with
 <%= f.check_box :remove_cover_image %>

assign from some other url with
 <%= f.text_field :cover_image_url %>

and display a thumbnail (on the upload form) with
 <%= image_tag @album.cover_image.thumb('100x100').url if @album.cover_image_uid %>

View (to display):
<%= image_tag @album.cover_image.url %>
<%= image_tag @album.cover_image.thumb('400x200#').url %>
<%= image_tag @album.cover_image.jpg.url %>
<%= image_tag @album.cover_image.process(:greyscale).encode(:tiff).url %>
...etc.

The above relies on imagemagick being installed. Dragonfly doesn't depend on it per se, but the default configuration 'dragonfly/rails/images'
uses it. For alternative configurations, see below.
If using Capistrano with the above, you probably will want to keep the cache between deploys, so in deploy.rb:
namespace :dragonfly do
desc "Symlink the Rack::Cache files"
task :symlink, :roles => [:app] do
run "mkdir -p #{shared_path}/tmp/dragonfly && ln -nfs #{shared_path}/tmp/dragonfly #{release_path}/tmp/dragonfly"
end
end
after 'deploy:update_code', 'dragonfly:symlink'

Sinatra, CouchDB, Mongo, Rack, S3, custom storage, processing, and more...
Dragonfly is not just for Rails - it's primarily a Rack app, so you can use it as a standalone app, or with Sinatra, Merb, etc.
It's highly customizable, and works with any data type (not just images).
For more info, consult the DOCUMENTATION
Add-ons
For third-party add-ons, see the Add-ons wiki
Issues
Please use the github issue tracker if you have any issues.
Suggestions/Questions
Google group dragonfly-users
Credits
Copyright
Copyright (c) 2009-2010 Mark Evans. See LICENSE for details.
About
A Ruby Rack-based gem for on-the-fly processing - suitable for image uploading in Rails, Sinatra and much more!
markevans.github.com/dragonfly/
Resources
Readme
License
Activity
Custom properties
Stars
1 star
Watchers
0 watching
Forks
1 fork
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Dragonfly
Dragonfly is a Rack framework for on-the-fly image handling.
Ideal for using with Ruby on Rails (2.3 and 3), Sinatra and all that gubbins.
However, Dragonfly is NOT JUST FOR RAILS, and NOT JUST FOR IMAGES!!
For the lazy Rails user...
Gemfile:
gem 'rack-cache', :require => 'rack/cache'
gem 'dragonfly', '~>0.9.4'

Initializer (e.g. config/initializers/dragonfly.rb):
require 'dragonfly/rails/images'

Migration:
add_column :albums, :cover_image_uid, :string
add_column :albums, :cover_image_name, :string # Optional - only if you want urls
# to end with the original filename

Model:
class Album < ActiveRecord::Base
image_accessor :cover_image # 'image_accessor' is provided by Dragonfly
# this defines a reader/writer for cover_image
# ...
end

View (for uploading via a file field):
<% form_for @album, :html => {:multipart => true} do |f| %>
...
<%= f.file_field :cover_image %>
...
<% end %>

NB: REMEMBER THE MULTIPART BIT!!!
You can avoid having to re-upload when validations fail with
 <%= f.hidden_field :retained_cover_image %>

remove the attachment with
 <%= f.check_box :remove_cover_image %>

assign from some other url with
 <%= f.text_field :cover_image_url %>

and display a thumbnail (on the upload form) with
 <%= image_tag @album.cover_image.thumb('100x100').url if @album.cover_image_uid %>

View (to display):
<%= image_tag @album.cover_image.url %>
<%= image_tag @album.cover_image.thumb('400x200#').url %>
<%= image_tag @album.cover_image.jpg.url %>
<%= image_tag @album.cover_image.process(:greyscale).encode(:tiff).url %>
...etc.

The above relies on imagemagick being installed. Dragonfly doesn't depend on it per se, but the default configuration 'dragonfly/rails/images'
uses it. For alternative configurations, see below.
If using Capistrano with the above, you probably will want to keep the cache between deploys, so in deploy.rb:
namespace :dragonfly do
desc "Symlink the Rack::Cache files"
task :symlink, :roles => [:app] do
run "mkdir -p #{shared_path}/tmp/dragonfly && ln -nfs #{shared_path}/tmp/dragonfly #{release_path}/tmp/dragonfly"
end
end
after 'deploy:update_code', 'dragonfly:symlink'

Sinatra, CouchDB, Mongo, Rack, S3, custom storage, processing, and more...
Dragonfly is not just for Rails - it's primarily a Rack app, so you can use it as a standalone app, or with Sinatra, Merb, etc.
It's highly customizable, and works with any data type (not just images).
For more info, consult the DOCUMENTATION
Add-ons
For third-party add-ons, see the Add-ons wiki
Issues
Please use the github issue tracker if you have any issues.
Suggestions/Questions
Google group dragonfly-users
Credits
Copyright
Copyright (c) 2009-2010 Mark Evans. See LICENSE for details.
About
A Ruby Rack-based gem for on-the-fly processing - suitable for image uploading in Rails, Sinatra and much more!
markevans.github.com/dragonfly/
Resources
Readme
License
Activity
Custom properties
Stars
1 star
Watchers
0 watching
Forks
1 fork
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Dragonfly
Dragonfly is a Rack framework for on-the-fly image handling.
Ideal for using with Ruby on Rails (2.3 and 3), Sinatra and all that gubbins.
However, Dragonfly is NOT JUST FOR RAILS, and NOT JUST FOR IMAGES!!
For the lazy Rails user...
Gemfile:
gem 'rack-cache', :require => 'rack/cache'
gem 'dragonfly', '~>0.9.4'

Initializer (e.g. config/initializers/dragonfly.rb):
require 'dragonfly/rails/images'

Migration:
add_column :albums, :cover_image_uid, :string
add_column :albums, :cover_image_name, :string # Optional - only if you want urls
# to end with the original filename

Model:
class Album < ActiveRecord::Base
image_accessor :cover_image # 'image_accessor' is provided by Dragonfly
# this defines a reader/writer for cover_image
# ...
end

View (for uploading via a file field):
<% form_for @album, :html => {:multipart => true} do |f| %>
...
<%= f.file_field :cover_image %>
...
<% end %>

NB: REMEMBER THE MULTIPART BIT!!!
You can avoid having to re-upload when validations fail with
 <%= f.hidden_field :retained_cover_image %>

remove the attachment with
 <%= f.check_box :remove_cover_image %>

assign from some other url with
 <%= f.text_field :cover_image_url %>

and display a thumbnail (on the upload form) with
 <%= image_tag @album.cover_image.thumb('100x100').url if @album.cover_image_uid %>

View (to display):
<%= image_tag @album.cover_image.url %>
<%= image_tag @album.cover_image.thumb('400x200#').url %>
<%= image_tag @album.cover_image.jpg.url %>
<%= image_tag @album.cover_image.process(:greyscale).encode(:tiff).url %>
...etc.

The above relies on imagemagick being installed. Dragonfly doesn't depend on it per se, but the default configuration 'dragonfly/rails/images'
uses it. For alternative configurations, see below.
If using Capistrano with the above, you probably will want to keep the cache between deploys, so in deploy.rb:
namespace :dragonfly do
desc "Symlink the Rack::Cache files"
task :symlink, :roles => [:app] do
run "mkdir -p #{shared_path}/tmp/dragonfly && ln -nfs #{shared_path}/tmp/dragonfly #{release_path}/tmp/dragonfly"
end
end
after 'deploy:update_code', 'dragonfly:symlink'

Sinatra, CouchDB, Mongo, Rack, S3, custom storage, processing, and more...
Dragonfly is not just for Rails - it's primarily a Rack app, so you can use it as a standalone app, or with Sinatra, Merb, etc.
It's highly customizable, and works with any data type (not just images).
For more info, consult the DOCUMENTATION
Add-ons
For third-party add-ons, see the Add-ons wiki
Issues
Please use the github issue tracker if you have any issues.
Suggestions/Questions
Google group dragonfly-users
Credits
Copyright
Copyright (c) 2009-2010 Mark Evans. See LICENSE for details.
About
A Ruby Rack-based gem for on-the-fly processing - suitable for image uploading in Rails, Sinatra and much more!
markevans.github.com/dragonfly/
Resources
Readme
License
Activity
Custom properties
Stars
1 star
Watchers
0 watching
Forks
1 fork
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
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Dragonfly
Dragonfly is a Rack framework for on-the-fly image handling.
Ideal for using with Ruby on Rails (2.3 and 3), Sinatra and all that gubbins.
However, Dragonfly is NOT JUST FOR RAILS, and NOT JUST FOR IMAGES!!
For the lazy Rails user...
Gemfile:
gem 'rack-cache', :require => 'rack/cache'
gem 'dragonfly', '~>0.9.4'

Initializer (e.g. config/initializers/dragonfly.rb):
require 'dragonfly/rails/images'

Migration:
add_column :albums, :cover_image_uid, :string
add_column :albums, :cover_image_name, :string # Optional - only if you want urls
# to end with the original filename

Model:
class Album < ActiveRecord::Base
image_accessor :cover_image # 'image_accessor' is provided by Dragonfly
# this defines a reader/writer for cover_image
# ...
end

View (for uploading via a file field):
<% form_for @album, :html => {:multipart => true} do |f| %>
...
<%= f.file_field :cover_image %>
...
<% end %>

NB: REMEMBER THE MULTIPART BIT!!!
You can avoid having to re-upload when validations fail with
 <%= f.hidden_field :retained_cover_image %>

remove the attachment with
 <%= f.check_box :remove_cover_image %>

assign from some other url with
 <%= f.text_field :cover_image_url %>

and display a thumbnail (on the upload form) with
 <%= image_tag @album.cover_image.thumb('100x100').url if @album.cover_image_uid %>

View (to display):
<%= image_tag @album.cover_image.url %>
<%= image_tag @album.cover_image.thumb('400x200#').url %>
<%= image_tag @album.cover_image.jpg.url %>
<%= image_tag @album.cover_image.process(:greyscale).encode(:tiff).url %>
...etc.

The above relies on imagemagick being installed. Dragonfly doesn't depend on it per se, but the default configuration 'dragonfly/rails/images'
uses it. For alternative configurations, see below.
If using Capistrano with the above, you probably will want to keep the cache between deploys, so in deploy.rb:
namespace :dragonfly do
desc "Symlink the Rack::Cache files"
task :symlink, :roles => [:app] do
run "mkdir -p #{shared_path}/tmp/dragonfly && ln -nfs #{shared_path}/tmp/dragonfly #{release_path}/tmp/dragonfly"
end
end
after 'deploy:update_code', 'dragonfly:symlink'

Sinatra, CouchDB, Mongo, Rack, S3, custom storage, processing, and more...
Dragonfly is not just for Rails - it's primarily a Rack app, so you can use it as a standalone app, or with Sinatra, Merb, etc.
It's highly customizable, and works with any data type (not just images).
For more info, consult the DOCUMENTATION
Add-ons
For third-party add-ons, see the Add-ons wiki
Issues
Please use the github issue tracker if you have any issues.
Suggestions/Questions
Google group dragonfly-users
Credits
Copyright
Copyright (c) 2009-2010 Mark Evans. See LICENSE for details.
About
A Ruby Rack-based gem for on-the-fly processing - suitable for image uploading in Rails, Sinatra and much more!
markevans.github.com/dragonfly/
Resources
Readme
License
Activity
Custom properties
Stars
1 star
Watchers
0 watching
Forks
1 fork
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
BranchesTags
Repository files navigation
Dragonfly
Dragonfly is a Rack framework for on-the-fly image handling.
Ideal for using with Ruby on Rails (2.3 and 3), Sinatra and all that gubbins.
However, Dragonfly is NOT JUST FOR RAILS, and NOT JUST FOR IMAGES!!
For the lazy Rails user...
Gemfile:
gem 'rack-cache', :require => 'rack/cache'
gem 'dragonfly', '~>0.9.4'

Initializer (e.g. config/initializers/dragonfly.rb):
require 'dragonfly/rails/images'

Migration:
add_column :albums, :cover_image_uid, :string
add_column :albums, :cover_image_name, :string # Optional - only if you want urls
# to end with the original filename

Model:
class Album < ActiveRecord::Base
image_accessor :cover_image # 'image_accessor' is provided by Dragonfly
# this defines a reader/writer for cover_image
# ...
end

View (for uploading via a file field):
<% form_for @album, :html => {:multipart => true} do |f| %>
...
<%= f.file_field :cover_image %>
...
<% end %>

NB: REMEMBER THE MULTIPART BIT!!!
You can avoid having to re-upload when validations fail with
 <%= f.hidden_field :retained_cover_image %>

remove the attachment with
 <%= f.check_box :remove_cover_image %>

assign from some other url with
 <%= f.text_field :cover_image_url %>

and display a thumbnail (on the upload form) with
 <%= image_tag @album.cover_image.thumb('100x100').url if @album.cover_image_uid %>

View (to display):
<%= image_tag @album.cover_image.url %>
<%= image_tag @album.cover_image.thumb('400x200#').url %>
<%= image_tag @album.cover_image.jpg.url %>
<%= image_tag @album.cover_image.process(:greyscale).encode(:tiff).url %>
...etc.

The above relies on imagemagick being installed. Dragonfly doesn't depend on it per se, but the default configuration 'dragonfly/rails/images'
uses it. For alternative configurations, see below.
If using Capistrano with the above, you probably will want to keep the cache between deploys, so in deploy.rb:
namespace :dragonfly do
desc "Symlink the Rack::Cache files"
task :symlink, :roles => [:app] do
run "mkdir -p #{shared_path}/tmp/dragonfly && ln -nfs #{shared_path}/tmp/dragonfly #{release_path}/tmp/dragonfly"
end
end
after 'deploy:update_code', 'dragonfly:symlink'

Sinatra, CouchDB, Mongo, Rack, S3, custom storage, processing, and more...
Dragonfly is not just for Rails - it's primarily a Rack app, so you can use it as a standalone app, or with Sinatra, Merb, etc.
It's highly customizable, and works with any data type (not just images).
For more info, consult the DOCUMENTATION
Add-ons
For third-party add-ons, see the Add-ons wiki
Issues
Please use the github issue tracker if you have any issues.
Suggestions/Questions
Google group dragonfly-users
Credits
Copyright
Copyright (c) 2009-2010 Mark Evans. See LICENSE for details.
About
A Ruby Rack-based gem for on-the-fly processing - suitable for image uploading in Rails, Sinatra and much more!
markevans.github.com/dragonfly/
Resources
Readme
License
Activity
Custom properties
Stars
1 star
Watchers
0 watching
Forks
1 fork
Report repository
Releases
Packages
Used by
Contributors
Languages