Uploading an image or file is a very common/annoying task given the related post-upload work like styling and validating. Fortunately, An Impressive gem called paperclip do that for us. I18n in rails is very special part and it has some tricks and in this class we are attacking these 2 topics.

1. Ruby on Rails
Course
By @AlSayedGamal

2. File/image Upload, delayed
background jobs and I18n
Day 7

3. Agenda
Paperclip and file/image upload
ActiveJob (delayed_job, resque,
sidkiq)
i18n

4. Install and use
paperclip
[Gemfile]gem "paperclip", "~> 4.3”
[Model.rb]
has_attached_file :avatar, styles: { medium: "300x300>", thumb:
"100x100>" }, default_url: "/images/:style/missing.png"
[Model.rb] #Validation
validates_attachment_content_type :avatar, content_type: /
Aimage/.*Z/
[Migration] add_attachment :<model>, :avatar
remove_attachment :users, :avatar
[view] = image_tag object.avatar.url(:version)
Example: = image_tag @user.avatar.url(:medium)

5. I18n
locale/en.yml and t()
I18n.locale
default_url_options
scope routes to locale

6. I18n
en:
someview
key: “value”
activerecord:
models:
user: “Dude”
attributes:
user:
login: "Handle"
= t(‘someview.key’) #value
= t(‘.key’) #value *
= User.model_name.human #Dude
= User.human_attribute_name("login")
#handle
* = if same view
en.yml view.haml

7. Sidekiq
background jobs that works

8. Delayed /
Background Job
Sidekiq Vs resque
redis
nexmo
thread safety
[routes.rb]
require 'sidekiq/web'
mount Sidekiq::Web, at: '/sidekiq'

9. BackgroundREST
Using Unirest
HTTP request can take some time.
gem ‘unirest’
response = Unirest.get “<apiurl>”,
headers:{"X-Mashape-Key" =>
"APIKEY",
"Accept" => “application/json"}
parameters:{key: value}

10. Thank you!