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				defmodule Pack.ErrorHelpers do
				@moduledoc """
				Conveniences for translating and building error messages.
				"""

				use Phoenix.HTML

				@doc """
				Generates tag for inlined form input errors.
				"""
				def error_tag(form, field) do
				if error = form.errors[field] do
				content_tag :span, translate_error(error), class: "help-block"
				end
				end

				@doc """
				Translates an error message using gettext.
				"""
				def translate_error({msg, opts}) do
				# Because error messages were defined within Ecto, we must
				# call the Gettext module passing our Gettext backend. We
				# also use the "errors" domain as translations are placed
				# in the errors.po file.
				# Ecto will pass the :count keyword if the error message is
				# meant to be pluralized.
				# On your own code and templates, depending on whether you
				# need the message to be pluralized or not, this could be
				# written simply as:
				#
				# dngettext "errors", "1 file", "%{count} files", count
				# dgettext "errors", "is invalid"
				#
				if count = opts[:count] do
				Gettext.dngettext(Pack.Gettext, "errors", msg, msg, count, opts)
				else
				Gettext.dgettext(Pack.Gettext, "errors", msg, opts)
				end
				end
				end