handle chip and chip values operations

app/models/chip.rb

@@ -0,0 +1,23 @@
+class Chip < ApplicationRecord
+  has_many :base_chip_values, class_name: "ChipValue", foreign_key: "base_chip_id", dependent: :delete_all
+  has_many :secondary_chip_values, class_name: "ChipValue", foreign_key: "secondary_chip_id", dependent: :delete_all
+
+  validates :name, uniqueness: true
+  validates :name, :symbol, presence: true
+
+  after_create :add_chip_values
+
+  private
+
+  # When new chip(currency) is added, add new record to the chip_values table for every existing chip(currency)
+  def add_chip_values
+    Chip.all.each do |chip|
+      next if chip.name == name
+
+      transaction do
+        ChipValue.new(base_chip: self, secondary_chip: chip, value: 0).save
+        ChipValue.new(base_chip: chip, secondary_chip: self, value: 0).save
+      end
+    end
+  end
+end