Attachs

Minimalistic toolkit to attach file and images to records.

Install

Put this line in your Gemfile:

gem 'attachs'

Then bundle:

$ bundle

ImageMagick must be install, you can install it with homebrew:

brew install imagemagick

Usage

Mount the engine at the end of you routes.rb (only if you are using local storage):

mount Attachs:Engine: '/' # Will be use to generate on the fly missing image presets

Add the column to your table (just a string):

create_table :models do |t|
  t.string :attr
end

If you need a file:

class Model < ActiveRecord::Base
  has_attached_file :attr, default: 'file.txt'
end

If you need a image:

class Model < ActiveRecord::Base
  has_attached_image :attr, presets: [:small, :big], default: 'assets/image.jpg'
end

Define presets in your application.rb

config.attachs.presets = {
  big: { method: :fit, width: 1024, height: 768 }, # Fit will scale the image until it fit in the space without cropping
  small: { method: :fill, width: 120, height: :120 }, # Fill will scale the image to fill all the space and then crop
  custom: proc { |image| image.convert resize: '100x100' } # ImageMagick wrapper to do whatever you want
}
config.attachs.default_presets = [:small] # Define the default presets for all models with attached images
config.attachs.storage = :local # The default it's local, you can use :s3 as well

If you want to use S3 create a s3.yml config file with this generator and complete it:

rails g attachs:s3:config

The validation works very similar to paperclip:

class Model < ActiveRecord::Base
  has_attached_file :attr
  validates :attr, attachment_presence: true, attachment_size: { in: 0..4.megabytes }, attachment_content_type: { in: ['txt'] }
end

If you want to translate the errores the keys are:

errors.messages.attachment_presence
errors.messages.attachment_size_in # :max and :min
errors.messages.attachment_size_less_than  # :count
errors.messages.attachment_size_greater_than # :count
errors.messages.attachment_content_type # :types

In your views:

a{ href: record.file.url } # To get the file url
a{ href: record.image.url } # To get the original image
a{ href: record.image.url(:big) } # To get the a thumb

In your forms:

= f.file_field :attr

If your file it’s optional:

= f.check_box :delete_attr

FAQ

How can I use a cdn with this plugin?

Define a base url in your application.rb:

config.attachs.base_url = 'http://cdn.example.com'

How can I automatically create buckets?

Use this rake task after create the s3.yml file:

rake attachs:s3:buckets:create

How can I clean a preset?

Use this rake task:

rake attachs:presets:clean MODEL=models PRESETS=first_preset,second_preset

How can I refresh a preset?

Use this rake task:

rake attachs:presets:refresh MODEL=models PRESETS=first_preset,second_preset

How can I migrate from versions before 0.3.0

All will work the same except from the name of the config parameter, replace uploads with attachs.