bones73k/lib/bones73k_web/views/error_helpers.ex

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Elixir
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defmodule Bones73kWeb.ErrorHelpers do
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@moduledoc """
Conveniences for translating and building error messages.
"""
use Phoenix.HTML
@doc """
Generates tag for inlined form input errors.
"""
def error_tag(form, field, opts \\ []) do
opts = error_opts(form, field, opts)
form.errors
|> Keyword.get_values(field)
|> Enum.map(fn error -> content_tag(:span, translate_error(error), opts) end)
end
defp error_opts(form, field, opts) do
append = "invalid-feedback"
input_id = input_id(form, field)
opts
|> Keyword.put_new(:id, error_id(input_id))
|> Keyword.put_new(:phx_feedback_for, input_id)
|> Keyword.update(:class, append, fn c -> "#{append} #{c}" end)
end
def error_id(%Phoenix.HTML.Form{} = form, field), do: input_id(form, field) |> error_id()
def error_id(input_id) when is_binary(input_id), do: "#{input_id}_feedback"
def input_class(form, field, classes \\ "") do
case form.source.action do
nil -> classes
_ ->
case Keyword.has_key?(form.errors, field) do
true -> "#{classes} is-invalid"
_ -> "#{classes} is-valid"
end
end
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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
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Gettext.dngettext(Bones73kWeb.Gettext, "errors", msg, msg, count, opts)
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else
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Gettext.dgettext(Bones73kWeb.Gettext, "errors", msg, opts)
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end
end
end