Sample for phoenix(elixir)-postgres

Signed-off-by: Manolis Kousanakis <ekousanakis@gmail.com>

phoenix-postgres/app/lib/app_web/views/error_helpers.ex

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+defmodule AppWeb.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
+    Enum.map(Keyword.get_values(form.errors, field), fn error ->
+      content_tag(:span, translate_error(error),
+        class: "help-block",
+        data: [phx_error_for: input_id(form, field)]
+      )
+    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(AppWeb.Gettext, "errors", msg, msg, count, opts)
+    else
+      Gettext.dgettext(AppWeb.Gettext, "errors", msg, opts)
+    end
+  end
+end

phoenix-postgres/app/lib/app_web/views/error_view.ex

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+defmodule AppWeb.ErrorView do
+  use AppWeb, :view
+
+  # If you want to customize a particular status code
+  # for a certain format, you may uncomment below.
+  # def render("500.html", _assigns) do
+  #   "Internal Server Error"
+  # end
+
+  # By default, Phoenix returns the status message from
+  # the template name. For example, "404.html" becomes
+  # "Not Found".
+  def template_not_found(template, _assigns) do
+    Phoenix.Controller.status_message_from_template(template)
+  end
+end

phoenix-postgres/app/lib/app_web/views/layout_view.ex

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+defmodule AppWeb.LayoutView do
+  use AppWeb, :view
+end

phoenix-postgres/app/lib/app_web/views/page_view.ex

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+defmodule AppWeb.PageView do
+  use AppWeb, :view
+end