rounding decimal to print_settings precision

app/models/sale_tax.rb

@@ -5,6 +5,8 @@ class SaleTax < ApplicationRecord
   before_create :generate_custom_id
   belongs_to :sale
 
+  before_validation :round_to_precision
+
   def self.sync_sale_tax_records(sale_taxes)
     if !sale_taxes.nil?
       sale_taxes.each do |t|
@@ -38,4 +40,13 @@ class SaleTax < ApplicationRecord
       self.sale_tax_id = SeedGenerator.generate_id(self.class.name, "STI")
     end
   end
+
+  def round_to_precision
+    if self.tax_payable_amount != self.tax_payable_amount_was
+      if self.tax_payable_amount % 1 > 0
+        precision = PrintSetting.get_precision_delimiter().precision.to_i
+        self.tax_payable_amount = self.tax_payable_amount.round(precision)
+      end
+    end
+  end
 end