update_or_create

update_or_create.rb

#Using in single model
def self.update_or_create(attributes)
  obj = first || new
  obj.assign_attributes(attributes)
  obj
end
	
#User.where(email: "a@b.com").update_or_create(email: "d@e.com")


#Using in all models
#app/models/concerns/update_or_create.rb
module UpdateOrCreate
    module Relation
      extend ActiveSupport::Concern

      module ClassMethods
        def update_or_create(attributes)
          assign_or_new(attributes)
        end

        def update_or_create!(attributes)
          assign_or_new(attributes).save!
        end

        def assign_or_new(attributes)
          obj = first || new
          obj.assign_attributes(attributes)
          obj
        end
      end
    end
end

ActiveRecord::Base.send :include, UpdateOrCreate::Relation

#app/models/yourmodel.rb
include UpdateOrCreate