Initial commit

app/models/concerns/precision_validator.rb

@@ -0,0 +1,23 @@
+# encoding: UTF-8
+# frozen_string_literal: true
+
+class PrecisionValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    return unless options.key?(:less_than_or_eq_to) && value.present?
+
+    precision = if options[:less_than_or_eq_to].respond_to?(:call)
+                  options[:less_than_or_eq_to].call(record)
+                else
+                  options[:less_than_or_eq_to]
+                end
+
+    unless value.is_a?(Numeric)
+      record.errors.add(attribute, 'must be a number')
+      return
+    end
+
+    unless value.round(precision) == value
+      record.errors.add(attribute, "precision must be less than or equal to #{precision}")
+    end
+  end
+end