##Delayed Job/Backgorund Job
1 brew install redis
2 To start the server redis-server
3 gem install redis
4 redis desktop manager
5 In your redis desktop manager connet to redis server name: localhost Host: localhost
6 Add gem sidekiq
gem 'sidekiq'
run bundle
7 In your config -> application.rb add this line of code
config.autoload_paths << Rails.root.join("app","jobs")
config.autoload_paths << Rails.root.join("app","uploaders")
config.active_job.queue_adapter = :sidekiq
8 We can setup a delayed jobs that will happen at specific time
bin/rails g job determine_campaign_state
def perform(*args)
campaign = args[0]
campaign.fund!
end
Polymorphic association
If a model has many associations assigning them to a single model will leave many empty fields To address this problem we can use polymorphic association
Ex. commentable_type commentable_id
bin/rails g model comment body:text commentable:references{polymorphic}
bin/rake db:migrate
In the campaign model has_many :comments, as: :commentable
We need to setup the controller bin/rails g controller comments
In your routes resources :comments, only: [:create]
Comments.controller
before_action :authenticate_user
before_action :find_commentable
def create
@comment = Comment.new comment_params
@comement.commentalbe = @commentable
if @comment.save
redirect_to @commentable, notice: "Comment created"
else
folder_name = @commentable.class.to_s.underscore.pluralize
render "/#{folder_name}/show"
end
end
private
def comment_params
commet_params(:comment).permit(:body)
end
def find_commentable
if params[:campaign_id]
@campaign = @commetable = Campaign.friendly.find params[:campaign_id]
elsif params[:discussion_id]
@discussion = @commetable = Discussion.friendly.find params[:discussion_id]
end
end<%= simple_form_for [@campaign,@comment] do |f| %>
<%end%>add validation to comment
validates :body, presence: true
display list of comments
<%= @campaign.comments.each do |com|%>
<div class="well">
<%=com.body%>
</div>
<% end %>