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copied!<p>One way to achieve what you want will be to use <a href="http://api.rubyonrails.org/classes/ActiveRecord/Callbacks.html" rel="nofollow">ActiveRecord::Callbacks</a>:</p> <pre><code>class Payment < ActiveRecord::Base attr_accessible :amount, :method, :payment_date, :reference_no, :invoice_id belongs_to :invoice after_create :update_invoice_balance def update_invoice_balance current_balance = self.invoice.balance self.invoice.update_attributes(balance: current_balance - self.amount) end end </code></pre> <p>Another way that you may try will be to use <code>accepts_nested_attributes_for</code> in your <code>Invoice</code> model:</p> <pre><code>class Invoice < ActiveRecord::Base belongs_to :customer, :inverse_of => :invoices attr_accessible :payments_attributes, :due_date, :invoice_date, :reading_ids, :customer_id, :customer, :status, :amount, :balance has_many :invoice_items, :dependent => :destroy has_many :payments, :dependent => :destroy accepts_nested_attributes_for :payments end </code></pre> <p>In this case, you will be creating payments from <code>invoces#edit</code> page and you can construct your form this way: you will have "Pay Now" button that will inject <code>payments/_new_form</code> into <code>invoices/_edit_form</code>, then any time the user will enter a value into <code>amount</code> field of <code>payments/_new_form</code>, you will update the value of balance field of <code>invoices/_edit_form</code> with the value from <code>amount</code> field of <code>payments/_new_form</code> using JavaScript. Submitting <code>invoices/_edit_form</code> will save both objects. If you take this approach, check out <a href="https://github.com/ryanb/nested_form" rel="nofollow">nested_form gem</a>, it makes things easier. However, I still reccommend the callback approach, since it guarantees that invoice balance is updated <em>every time</em> (even if you do it from the console, not UI).</p>

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