Paperclip download file

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If you're trying to use features that don't seem to be in the latest released gem, but are mentioned in this README, then you probably need to specify the master branch if you want to use them. Assuming you have a users table, add an avatar column to the users table:. Or you can use the Rails migration generator: rails generate paperclip user avatar. Keep this in mind if you are checking if files are present in a loop.

The first version is significantly more performant, but has different semantics. Paperclip will wrap up to four attributes all prefixed with that attachment's name, so you can have multiple attachments per model if you wish and give them a friendly front end.

These attributes are:. NOTE: Post-processing will not even start if the attachment is not valid according to the validations. Your callbacks and processors will only be called with valid attachments. If you have other validations that depend on assignment order, the recommended course of action is to prevent the assignment of the attachment until afterwards, then assign manually:.

You should ensure that you validate files to be only those MIME types you explicitly want to support. Thanks to a report from Egor Homakov we have taken steps to prevent people from spoofing Content-Types and getting data you weren't expecting onto your server. NOTE: Starting at version 4. 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. For example:. 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.