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templates/starter/controllers/error_helpers.ex
defmodule <%= @web_namespace %>.ErrorHelpers do
@moduledoc """
Conveniences for translating and building error messages.
"""
@doc """
Translates an error message.
"""
def translate_error({msg, opts}) do
# Because the error messages we show in our forms and APIs
# are defined inside Ecto, we need to translate them dynamically.
Enum.reduce(opts, msg, fn {key, value}, acc ->
String.replace(acc, "%{#{key}}", fn _ -> to_string(value) end)
end)
end
end