defmodule Shift73kWeb.ErrorHelpers do @moduledoc """ Conveniences for translating and building error messages. """ use Phoenix.HTML @doc """ Generates tag for inlined form input errors. """ def error_tag(%Phoenix.HTML.Form{} = form, field, opts \\ []) do opts = error_common_opts(form, field, "invalid-feedback", opts) form.errors |> Keyword.get_values(field) |> Stream.with_index() |> Enum.map(fn err_with_index -> error_tag_span(err_with_index, opts) end) end defp error_tag_span({err, _} = err_with_index, opts) do opts = error_tag_opts(err_with_index, opts) content_tag(:span, translate_error(err), opts) end defp error_common_opts(form, field, append, opts) do Keyword.put(opts, :phx_feedback_for, input_id(form, field)) |> Keyword.update(:class, append, fn c -> "#{append} #{c}" end) end defp error_tag_opts({_err, err_index}, opts) do input_id = Keyword.get(opts, :phx_feedback_for, "") Keyword.put(opts, :id, error_id(input_id, err_index)) end defp error_id(input_id, err_index), do: "#{input_id}_feedback-#{err_index}" def error_ids(%Phoenix.HTML.Form{} = form, field) do input_id = input_id(form, field) form.errors |> Keyword.get_values(field) |> Stream.with_index() |> Stream.map(fn {_, index} -> error_id(input_id, index) end) |> Enum.join(" ") end def input_class(form, field, classes \\ "") do if form.source.action do case Keyword.has_key?(form.errors, field) do true -> "#{classes} is-invalid" _ -> "#{classes} is-valid" end else classes end end @doc """ Translates an error message using gettext. """ def translate_error({msg, opts}) do # When using gettext, we typically pass the strings we want # to translate as a static argument: # # # Translate "is invalid" in the "errors" domain # dgettext("errors", "is invalid") # # # Translate the number of files with plural rules # dngettext("errors", "1 file", "%{count} files", count) # # Because the error messages we show in our forms and APIs # are defined inside Ecto, we need to translate them dynamically. # This requires us to call the Gettext module passing our gettext # backend as first argument. # # Note we use the "errors" domain, which means translations # should be written to the errors.po file. The :count option is # set by Ecto and indicates we should also apply plural rules. if count = opts[:count] do Gettext.dngettext(Shift73kWeb.Gettext, "errors", msg, msg, count, opts) else Gettext.dgettext(Shift73kWeb.Gettext, "errors", msg, opts) end end end