Validate attachment presence using paperclip
Make sure you call the methods in the following order and not vice versa:
has_attached_file :image
validates_attachment_presence :image
Validation with condition works fine, too:
validates_attachment_presence :image, :if => :method
This is because validates_attachment_presence is only available after saying has_attached_file.
Related cards:
Convert colorspace of images attached with Paperclip
has_attached_file(
:avatar,
:styles => { :large => "300x300", :small => "100x100" },
:convert_options => { all => "-colorspace RGB" }
)
Paperclip: undefined method `to_file' for #<Paperclip::Attachment:0000> (NoMethodError)
to_file has been removed in Paperclip 3.0.1.
Instead of using File to access Paperclip storage objects (like this: File.read(file.to_file.path)) you can use
Paperclip.io_adapters.fo...
Always store your Paperclip attachments in a separate folder per environment
tl;dr: Always have your attachment path start with :rails_root/storage/#{Rails.env}#{ENV['RAILS_TEST_NUMBER']}/.
The directory where you save your Paperclip attachments should not look like this:
storage/photos/1/...
stora...
Security issues with hash conditions in Rails 2 and Rails 3
Find conditions for scopes can be given either as an array (:conditions => ['state = ?', 'draft']) or a hash (:conditions => { 'state' => 'draft' }). The later is nicer to read, but has horrible security implications in some versions of Ru...
Check whether a Paperclip attachment exists
Don't simply test for the presence of the magic Paperclip attribute, it will return a paperclip Attachment object and thus always be true:
- if user.photo.present? # always true
= image_tag(user.photo.url)
Use #exists? instead:
...
Deliver Paperclip attachments to authorized users only
When Paperclip attachments should only be downloadable for selected users, there are three ways to go.
The same applies to files in Carrierwave.
...
Limiting CPU and memory resources of Paperclip convert jobs
If you're using Paperclip to store and convert images attached to your models, processing a lot of images will probably cause headache for your system operation colleagues because CPU and/or memory peaking.
If you're on Unix you can use nice ...
Rails: Custom validator for "only one of these" (XOR) presence validation
For Rails models where only one of multiple attributes may be filled out at the same time, there is no built-in validation.
I've seen different solutions in the wild, each with different downsides:
- Private method referenced via
validate: wor...
Caching in Rails < 6.1 may down parts of your application when using public cache control
TL;DR When using Cache-Control on a Rails application, make sure the Vary: Accept header is set.
Proxy caching is a good feature to serve your publicly visible application content faster and reduce load on your servers. It is e.g. availab...
Deleting stale Paperclip attachment styles from the server
Sometimes you add Paperclip image styles, sometimes you remove some. In order to only keep the files you actually need, you should remove stale Paperclip styles from your server.
This script has been used in production successful...