Either of these methods will give your Rails setup access to the file. Or, if you want to get the latest, you can get master from the main paperclip repository:. 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. Introduction This is the first part of my series - covering file uploading gems available for Rails developers. Here is a snapshot of what we want to build. For Mac users, you can do so by running the command. Open your Gemfile and add the Bootstrap gem Gemfile This is used for security reasons.
Let us generate our Photo model. You need to create the files below and paste in the code. First, your index page should look like this. Open your route configuration file and paste in the following. Validations Try uploading an image and you will get an error that looks like this. This validates the type of file uploaded. According to this, only images are allowed. Try uploading an image again and it will work this time. Use this if you do not want to validate the uploaded file type. Deleting a Photo In case you are wondering if it is possible to delete an uploaded file, PaperClip has got you covered.
Easy Attachment: PaperClip provides you with the option of enabling file upload in your Rails application easily. The process is involved is simple. PaperClip is a great option when building a simple application. It is advisable to avoid PaperClip if your application will be complex. For complex applications, you may want to consider CarrierWave.
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Connect and share knowledge within a single location that is structured and easy to search. I did like this: File download using Paperclip but it did not help.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Download file using gem Paperclip Ask Question. Asked 5 years, 11 months ago. Active 5 years, 3 months ago. Viewed 1k times. I want to understand how to download file using Paperclip.
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