Hypertechblog

 delegate methods in Rails, exposing only necessary methods of containing objects, thereby, making them more easily accessible. class Parent   def initialize     @child = Child.new   end end class Child   def initialize     @data = []   end   def insert(data)     @data << data   end   def fetch(key)     @data[key]   end end parent = Parent.new if you try this parent.insert("imrahul") then you will get response undefined method `insert' for #<Parent:0x000055f4915673a0 @child=#<Child:0x000055f491567350 @data=[]>> (NoMethodError)   This code will work if we overide methods of child class class Parent   def initialize     @child = Child.new   end   def insert(data)     @child.insert(data)   end   def fetch(index)     @child.fetch(index)   end end class Child   def initialize     @data = []   end   def insert(data)     @data << data   end   def fetch(key)     @data[key]   end end parent = Parent.new parent.insert("imrahul") So this is how dele

cd path to your project. gem 'whenever', require: false   add it to your gemfile run bundle install bundle exec wheneverize .   //This will create an initial config/schedule.rb Now create your job call it  from config/schedule.rb whenever --update-crontab   //update crontab crontab -l   //list all cron job set :output, "log/cron.log"    //if you want to set log file for cron job then that this line at the top of config/schedule.rb         in production server:                   after deployment :  bundle exec whenever whenever --update-crontab crontab -l source: https://github.com/javan/whenever https://www.rubyguides.com/2019/04/ruby-whenever-gem/

scope :get_by_currency, -> (currency) {find_by(currency_id: currency)} scope :by_role, ->(role) { joins(:roles).where(roles: { name: role }) } //it will work in rails 4 and previous version scope :by_role, ->(role) { joins(:roles).where('roles.name ? ', #{role} ) } //it will work in all versions of rails validate  :validate_mimimum_amount, unless: -> (order) { order.ord_type=='market' || order.ord_type=='manual' }