controller.rb

class ReviewsController < ApplicationController
  def edit
    @review = Reviews::Submitter.new(params).model
  end

  def update
    submitter = Reviews::Submitter.new(params)
    @review = submitter.model

    submitter.on(:success) { |review| redirect_to success_reviews_path }
    submitter.on(:failure) { |review| render action: :edit }
    submitter.call
  end
end

review.rb

class Review < ActiveRecord::Base
  belongs_to :psy, class_name: 'User'
  belongs_to :patient, class_name: 'User'
end

submitter.rb

module Reviews
  class Submitter
    class Form
      include ActiveModel::Model
      include Virtus.model

      attribute :content, String
      attribute :age,     Integer
      attribute :gender,  String
      attribute :submitted_at, DateTime, writer: :private, default: lambda { |review, attribute| Time.zone.now }

      validates :content, presence: true
      validates :age,     presence: true, inclusion: { in: 12..115 }
      validates :gender,  presence: true, inclusion: { in: ['M','F'] }
    end

    include Wisper::Publisher
    attr_reader :params

    def initialize(params)
      @params = params
    end

    def call
      if form.valid?
        model.update_attributes form.attributes
        broadcast(:success, model)
        broadcast(:review_submitted, model)
      else
        broadcast(:failure, model)
      end
    end

    def model
      @model ||= Review.where(token: params[:id], submitted_at: nil).take!
    end

    def form
      @form ||= Form.new(params[:review])
    end
  end
end