web/views/error_helpers.ex

   1 defmodule TechRadarEditor.ErrorHelpers do
   2   @moduledoc """
   3   Conveniences for translating and building error messages.
   4   """
   5
   6   use Phoenix.HTML
   7
   8   @doc """
   9   Generates tag for inlined form input errors.
  10   """
  11   def error_tag(form, field) do
  12     if error = form.errors[field] do
  13       content_tag :span, translate_error(error), class: "help-block"
  14     end
  15   end
  16
  17   @doc """
  18   Translates an error message using gettext.
  19   """
  20   def translate_error({msg, opts}) do
  21     # Because error messages were defined within Ecto, we must
  22     # call the Gettext module passing our Gettext backend. We
  23     # also use the "errors" domain as translations are placed
  24     # in the errors.po file.
  25     # Ecto will pass the :count keyword if the error message is
  26     # meant to be pluralized.
  27     # On your own code and templates, depending on whether you
  28     # need the message to be pluralized or not, this could be
  29     # written simply as:
  30     #
  31     #     dngettext "errors", "1 file", "%{count} files", count
  32     #     dgettext "errors", "is invalid"
  33     #
  34     if count = opts[:count] do
  35       Gettext.dngettext(TechRadarEditor.Gettext, "errors", msg, msg, count, opts)
  36     else
  37       Gettext.dgettext(TechRadarEditor.Gettext, "errors", msg, opts)
  38     end
  39   end
  40 end