crispy-tribble

Handling nasty custom attributes using ActiveSupport::Concern

Prerequisites

• Rails 5.2.0
• ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]
• Sqilte3 3.11.0 2016-02-15 17:29:24 3d862f207e3adc00f78066799ac5a8c282430a5f for development
• Ubuntu 16.04.4 LTS(Codename: xenial) (Used as development machine)

Installation

git clone [email protected]:rajeevkannav/crispy-tribble.git
cd crispy-tribble  
gem install bundler
bundle install
rails db:create db:migrate db:seed
rails s

Considerations(philosophy)

Assuming system consists a Partner at any given time which is Partner.current_partner. Partner's definination are available into models/partner.rb.

By default an user object will have to columns/attributes only which are name and phone. and as per requirement Partner.current_partner = '2' needs [:nickname, :gender, :age] custom-attributes but Partner.current_partner = '1' needs only [:nickname, :gender]. further definations can be added to partner.rb

Once in the system Partner.current_partner is available the object of model in which includes ExtraAttributable will have the ability to respond to required custom_attributes.

As and when ActiveSupport::Concern ExtraAttributable included into any model (User in our case) and Partner.current_partner is available. then every object of User model will be able to respond to custom_attributes corresponding to its defination.

custom_attributes will be saved into ExtraAttributes.(that's it.)

For an example :

	## By default
	user = User.new(name: "Rajeev Sharma", phone: '9811288952')
	# => #<User id: nil, name: "Rajeev Sharma", phone: "9811288952", created_at: nil, updated_at: nil> 
	user.age
	# =>NoMethodError (undefined method `age
	user.gender
	# =>NoMethodError (undefined method `gender
	user.nickname
	# =>NoMethodError (undefined method `nickname
	user.save # only name and phone will be saved for user.
	# => true


	## For Partner.current_partner = '2' required custom attributes are [:nickname, :gender, :age].
	Partner.current_partner = '2' 
	user = User.new(name: "Rajeev Sharma", phone: '9811288952')
	# => #<User id: nil, name: "Rajeev Sharma", phone: "9811288952", created_at: nil, updated_at: nil> 
	user.nickname = "Ashu"
	# => "Ashu" 
	user.age = 32
	# => 32 
	user.gender = "Male"
	# => "Male" 
	user.save # only defined custom attributes will be saved for user.
	# => true

	user = User.where(nickname: 'Ashu', name: "Rajeev Sharma", age: 32, gender: "Male").first
	user.nickname = "Ashu"
	# => "Ashu" 
	user.age = 32
	# => 32 
	user.gender = "Male"
	# => "Male" 


	## For Partner.current_partner = '1' required custom attributes are [:nickname, :gender].
	Partner.current_partner = '1'
	user = User.where(nickname: 'Ashu', name: "Rajeev Sharma", gender: "Male").first ## NOT AGE
	user.nickname 
	# => "Ashu" 
	user.age
	# NoMethodError (undefined method `age'
	user.gender 
	# => "Male" 

Tests

To run tests rspec .