Rails 4 - dynamically add nested json data in jsonb column

In my Ruby on Rails 4 app, I have a jsonb column called 'deals_usage'.

I would like to set up the following :

• on create

  deals_usage= { }   
  
  

• when a user loads deal number2 view (as an example), the attribute value change the value of deal_usage for the current user

  deals_usage= {
     { Deal 2 = { clicks_performed_by_user = 0, purchases_performed_by_user= 0 }
   }
  
  

• then if a user click something inside the Deal, the attribute value change to:

  deals_usage= {
     { Deal 2 = {clicks_performed_by_user = 1, purchases_performed_by_user= 0 }
  }
  
  

So if a user participated in deal 2 with 1 click and in Deal n°5 with 1 purchase the deal_usage would be.

     deals_usage={ 
         { Deal 2 = { clicks_performed_by_user = 1, purchases_performed_by_user= 0},
           Deal 5 = {clicks_performed_by_user = 0, purchases_performed_by_user= 1}
      }

Note: increments can only be +1 . If a user clicks: click+=1, if user purchase, purchase+=1. On this patter, it's quite simple.

Today I fail to achieve that. My current code below only does this:

• on create

   deals_usage= { }
  
  

• when a user loads deal number2 view (as an example), it changes the value of deal_usage for the current user

  deal_usage= { { clicks_performed_by_user = 0, purchases_performed_by_user= 0} }
  
  

And then I manage on each click and purchase to increment their values so that if user clicks in ANY DEAL, I get

    deal_usage= { { clicks_performed_by_user = 1, purchases_performed_by_user= 0} }

BUT as you see I don't know on which Deal the click was performed. I don't know how to define in active record and save inside the database when clicks and purchases happen, when it comes to doing it PER DEAL.

I think one of the challenge involve creating a sort of dynamic store accessors as the number and the id of deals vary, each user will participate in different deals, and so on...

Here is my current code

Deals_controller.rb

class DealsController < ApplicationController

def show_deal_page   
    @deal = Deal.friendly.find params[:id]
    #pass rails variables to js views with gon

    respond_to do |format|
      format.html # showcase.html.erb
      format.json { render json: @deal }
    end      

  end 

def click_inside_deal
    @deal = Deal.friendly.find params[:id]
    current_user.increment_per_deal_clicks_performed_by_user

    respond_to do |format|
        format.js 
    end    
  end    
end
purchase click_inside_deal
    @deal = Deal.friendly.find params[:id]
    current_user.increment_per_deal_purchases_performed_by_user

    respond_to do |format|
        format.js { render :template => "deals/show_purchase_modal.js.erb" }
    end    
  end    
end

models/user.rb

class User < ActiveRecord::Base
  rolify

  # postgresql JSON attributes accessors  
  store_accessor :deals_usage,
                  # how to put here that the 2 following accessors are for EACH deal the user participate in ?
                  :clicks_performed_by_user,
                  :purchases_performed_by_user

 def increment_per_deal_clicks_performed_by_user
      self.update_attribute(:clicks_performed_by_user, self.clicks_performed_by_user += 1) 
    end

 def increment_per_deal_purchases_performed_by_user
      self.update_attribute(:purchases_performed_by_user, self.purchases_performed_by_user += 1) 
    end

def set_default_clicks_performed_by_user
      self.clicks_performed_by_user         ||= 0
    end 

def set_default_purchases_performed_by_user
      self.purchases_performed_by_user      ||= 0
    end