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Asset-management derived from Keith Bingman's Paperclipped extension.


~> 0.9.5
~> 0.5.8
< 11.0
~> 3.1.0
~> 2.1.5
 Project Readme

TrustyCms Clipped Extension

Gem Version

Build Status

Asset management for TrustyCms CMS.

The Clipped extension comes bundled with the TrustyCms gem but may be updated separately. Only TrustyCms versions 1.0 or newer are supported.

Please file bugs and feature requests on Github. If you have questions regarding usage ask on the [mailing list][mailing-list].


  • Concurrent uploads
  • Automatic thumbnail generation
    • requires ImageMagick for images
    • requires FFmpeg for videos
    • requires Ghostscript for PDFs
  • In-page and dedicated management interfaces
  • Easily to extended with new asset types and processors


If you installed the TrustyCms gem then you already have Clipped installed. You can upgrade to a newer version using bundle update trusty-clipped-extension.

Installation of the optional post-processors varies by system but are likely available through your package manager.


brew install ghostscript imagemagick ffmpeg
# or
port install ghostscript imagemagick ffmpeg


apt-get install ghostscript imagemagick ffmpeg


Ghostscript, ImageMagick and FFmpeg all offer Windows installers that you can install in the usual way.

If the post-processors are not in your PATH or you're running Passenger you might need to set Paperclip.options[:command_path] to the location where the binaries are installed.


The clipped extension is configured in the usual way, but only its minor settings are exposed in the admin interface. The more architectural settings shouldn't be changed at runtime and some of them will require a lot of sorting out if they're changed at all, so those are only accessible through the console or by editing the database. Eventually they will be made part of the initial trusty-cms installation process.

Structural settings

  • paperclip.url sets the url scheme for attached files. Paperclip interpolations are applied. You probably don't want to change this.
  • paperclip.path sets the path scheme for attached files. Paperclip interpolations are applied. You might conceivably want to change this.
  • can be 'filesystem' (the default) or 'fog' for cloud storage (such as s3).
  • paperclip.skip_filetype_validation is true by default and allows uploads of any mime type.

Cloud Storage

Set to 'fog' and add the following line to your Gemfile

gem "fog", "~> 1.0"

You also have to provide the following settings:

  • paperclip.fog.provider # set to one of "AWS", "Google" or "Rackspace"

If set to AWS, provide the following:

  • paperclip.s3.bucket
  • paperclip.s3.key
  • paperclip.s3.secret
  • paperclip.s3.region

If set to "Google", provide the following:

  • paperclip.google_storage.access_key_id
  • paperclip.google_storage.secret_access_key

If set to "Rackspace", provide the following:

  • paperclip.rackspace.username
  • paperclip.rackspace.api_key

And optionally:

  • paperclip.fog.public?

Configurable settings

If you want to disable a whole category of post-processing, set one of these options to false:

  • assets.create_image_thumbnails?
  • assets.create_video_thumbnails?
  • assets.create_pdf_thumbnails?

If we can't find ffmpeg on initialization, video thumbnailing will be disabled automatically by setting assets.create_video_thumbnails? to false.

To set a threshold for the size of uploads permitted:

  • assets.max_asset_size which should be an integer number of MB

And you can set some defaults:

  • assets.insertion_size is the name of the style that's used when you click on 'insert' to add a radius asset tag to your text. You can edit it after insertion, of course.
  • assets.display_size is the name of the style that's shows when you edit a single asset in the admin interface.

Asset Thumbnail Sizes

To configure different thumbnail sizes, set assets.thumbnails.image. Here is an example of setting two custom thumbnail sizes:

TrustyCms::Config['assets.thumbnails.image'] = "custom:geometry=200x300>,format=jpg|bigger:geometry=600x700>,format=jpg"


For most purposes you will probably work with assets while you're working on pages. Click on one of the 'assets' links and a panel will pop up allowing you to find, insert and attach existing assets or upload new ones.

For tidying up, replacing files and other admin, click on the 'assets' tab to get a larger version of the same list. Here again you can search for assets and filter the results by type, but the options are 'edit' and 'remove' and on editing you can change name, file and caption while keeping page associations intact.

Radius Tags

The asset manager has its own family of radius tags. The basic tag is <r:asset/>, which can be used either alone or as a double tag. This tag requires a name or id attribute, which references the asset. The <r:asset/> tag can be combined with other tags for a variety of uses:

<r:asset:image name="image.png"/>  #=>  <img src="/path/to/image.png" />
<r:asset:link name="image.png"/>   #=>  <a href="/path/to/image.png">image.png</a>

You could also use:

<r:asset:link name="bar.pdf">Download PDF</r:asset:link>

Asset links are also available, such as content_type, file_size, and url.

Another important tag is the <r:assets:each>...</r:assets:each> (note the plural namespace tag "assets"). If a page has attached assets, the <r:assets:each> tag will cycle through each asset. You can then use an image, link or url tag to display and connect your assets. Usage:

<r:assets:each [limit=0] [offset=0] [order="asc|desc"] [by="position|title|..."]>

This tag uses the following parameters:

  • limit and offset let you specify a range of assets
  • order and by lets you control sorting

The conditional tags <r:if_assets [min_count="0"]> and <r:unless_assets [min_count="0"]> allow you to optionally render content based on the existence of tags. They accept the same options as <r:assets:each>.

Thumbnails are automatically generated for images when the images are uploaded. By default, two sizes are made for use within the extension itself. These are "icon" 42px by 42px and "thumbnail" which is 100px square.

You can access sizes of image assets for various versions with tags like <r:asset:width [size="original"]/> and <r:asset:height [size="original"]/>.

Also, for vertical centering of images, you have the handy <r:asset:top_padding container="<container height>" [size="icon"]/> tag. Working example:

    <li style="height:140px">
      <img style="padding-top:<r:top_padding size='category' container='140'/>px" src="<r:url/>" alt="<r:caption/>">


If you would like to contribute, please fork the project and submit a pull request.

Pull requests with working tests are preferred and have a greater chance of being merged.


  • Progress bars while uploading assets
  • Warning if you try and save a page while assets are still uploading
  • Radius tags for the HTML video and audio elements
  • Auxiliary extension to add video transcoding support


  • Keith Bingman
  • John Long
  • William Ross
  • Eric Sipple

Copyright 2011 the TrustyCms team. Released under the same terms as TrustyCms.