Paperclip attachment file path

The Overflow Blog. Podcast Making Agile work for data science. Stack Gives Back Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Linked Related Hot Network Questions. Question feed. Stack Overflow works best with JavaScript enabled. ImageMagick supports a number of environment variables for controlling its resource limits. For example, you can enforce memory or execution time limits by setting the following variables in your application's process environment:.

For a full list of variables and description, see ImageMagick's resources documentation. You can write your own custom attachment processors to carry out tasks like adding watermarks, compressing images, or encrypting files. Multiple processors can be specified, and they will be invoked in the order they are defined in the :processors array.

Each successive processor is given the result from the previous processor. All processors receive the same parameters, which are defined in the :styles hash. For example, assuming we had this definition:. If a processor receives an option it doesn't recognise, it's expected to ignore it. NOTE: Because processors operate by turning the original attachment into the styles, no processors will be run if there are no styles defined.

If you're interested in caching your thumbnail's width, height and size in the database, take a look at the paperclip-meta gem. Before and after the Post Processing step, Paperclip calls back to the model with a few callbacks, allowing the model to change or cancel the processing step.

NOTE: Post processing will not even start if the attachment is not valid according to the validations. Paperclip has an interpolation called :hash for obfuscating filenames of publicly-available files. For more on this feature, read the author's own explanation. A checksum of the original file assigned will be placed in the model if it has an attribute named fingerprint. Following the user model migration example above, the migration would look like the following:. The algorithm can be specified using a configuration option; it defaults to MD5 for backwards compatibility with Paperclip 5 and earlier.

An option is available to preserve attachments in order to play nicely with soft-deleted models. Callable objects lambdas, Procs can be used in a number of places for dynamic configuration throughout Paperclip.

This strategy exists in a number of components of the library but is most significant in the possibilities for allowing custom styles and processors to be applied for specific model instances, rather than applying defined styles and processors across all instances. Imagine a user model that had different styles based on the role of the user.

Perhaps some users are bosses e. The configuration to determine what style parameters are to be used based on the user role might look as follows where a boss will receive a x thumbnail otherwise a x thumbnail will be created. Another contrived example is a user model that is aware of which file processors should be applied to it beyond the implied thumbnail processor invoked when :styles are defined.

Perhaps we have a watermark processor available and it is only used on the avatars of certain models. The configuration for this might be where the instance is queried for which processors should be applied to it.

Presumably some users might return [:thumbnail, :watermark] for its processors, where a defined watermark processor is invoked after the thumbnail processor already defined by Paperclip. By default, Paperclip outputs logging according to your logger level. If you want to disable logging e. More information in the rdocs. Paperclip is aware of new attachment styles you have added in previous deploys. You can change it by:. Now you don't have to remember to refresh thumbnails in production every time you add a new style.

Unfortunately, it does not work with dynamic styles - it just ignores them. Paperclip provides rspec-compatible matchers for testing attachments. See the documentation on Paperclip::Shoulda::Matchers for more information. Because of the default path for Paperclip storage, if you try to run tests in parallel, you may find that files get overwritten because the same path is being calculated for them in each test process.

Using integration tests with FactoryBot may save multiple copies of your test files within the app. If you'd like to contribute a feature or bugfix: Thanks! Thank you to all the contributors! Paperclip is maintained and funded by thoughtbot. The names and logos for thoughtbot are trademarks of thoughtbot, inc.

We love open source software! Paperclip will raise an error if you do not do this. This keeps Paperclip secure-by-default, and will prevent people trying to mess with your filesystem. NOTE: Also starting at version 4. This validation will prevent content type spoofing. This validation will only add validation errors to the form.

It will not cause errors to be raised. This can sometimes cause false validation errors in applications that use custom file extensions. Global defaults for all your Paperclip attachments can be defined by changing the Paperclip::Attachment.

These will get merged into Paperclip::Attachment. An example:. Another option is to directly modify the Paperclip::Attachment. Paperclip defines several migration methods which can be used to create the necessary columns in your model. There are two types of helper methods to aid in this, as follows:. Vintage syntax such as t. If you would like to use Paperclip with another storage, you can install these gems along side with Paperclip:.

For example, using that :path , you may have a file at. NOTE : This is a change from previous versions of Paperclip, but is overall a safer choice for the default file store. You may also choose to store your files using Amazon's S3 service. To do so, include the aws-sdk-s3 gem in your Gemfile:. You can find more information about configuring and using S3 storage in the Paperclip::Storage::S3 documentation.

Files on the local filesystem and in the Rails app's public directory will be available to the internet at large. If you require access control, it's possible to place your files in a different location. You will need to change both the :path and :url options in order to make sure the files are unavailable to the public. Both :path and :url allow the same set of interpolated variables. When a file is uploaded or attached, it can be in one of a few different input forms, from Rails' UploadedFile object to a StringIO to a Tempfile or even a simple String that is a URL that points to an image.

Paperclip will accept, by default, many of these sources. It also is capable of handling even more with a little configuration. The IO Adapters that handle images from non-local sources are not enabled by default. It's best to only enable a remote-loading adapter if you need it. Otherwise there's a chance that someone can gain insight into your internal network structure using it as a vector. Paperclip supports an extensible selection of post-processors.

When you define a set of styles for an attachment, by default it is expected that those "styles" are actually "thumbnails. For backward compatibility reasons you can pass either a single geometry string, or an array containing a geometry and a format that the file will be converted to, like so:.

This will convert the "thumb" style to a 32x32 square in PNG format, regardless of what was uploaded. If the format is not specified, it is kept the same e. Paperclip::Thumbnail uses ImageMagick to process images; ImageMagick's geometry documentation has more information on the accepted style formats.

With Rails there are a number of plugins and gems for helping with this. The one I use most often is Paperclip. But, as your application matures, your needs often change and some custom configuration is often required. The way that you do this for those new to Paperclip is:.

On a recent project the client wanted us to store uploads in a very specific path structure. On the surface this seemed a simple enough request. As we dug deeper, though, it became clear that one part of the path needed to be based on the attribute of a model that was related to the model on which the file data was being stored.