Concern to rename attribute column names for validation errors.

gistfile1.txt

# small concern that allows you to override the field names for validation messages
#
# Example:
#
#   # without concern
#   class User < ActiveRecord::Base
#     validates :name, presence: true
#   end
#   # => "Name can't be blank"
#
#   # with concern
#   class User < ActiveRecord::Base
#     include CustomFieldNames
#     # use "My name" instead of "Name"
#     rename_fields :name => 'My name'
#
#     validates :name, presence: true
#   end
#   # => "My name can't be blank"
#
module Concerns
  module CustomFieldNames
    extend ActiveSupport::Concern

    included do
      extend ClassMethods
      class_attribute(:_field_name_map){ Hash.new }
    end

    module ClassMethods
      # Example:
      #   rename_fields :column => 'New Name'
      def rename_fields(map = {})
        self._field_name_map = map.symbolize_keys
        self._field_name_map.each do |original, aliased|
          self.alias_attribute aliased.to_sym, original.to_sym
        end
      end

      # override some error messages to use our custom column names
      def human_attribute_name(attribute, options = {})
        self._field_name_map[attribute.to_sym] || super
      end
    end

    def errors
      @errors ||= super
      @errors.dup.each do |k, v|
        if self.class._field_name_map.keys.include?(k)
          @errors.delete(k)
          @errors.add(self.class._field_name_map[k], v)
        end
      end
      @errors
    end
  end
end