defstructplusplus.ex

defmodule DefStructPlusPlus do

  @doc """
   Macro for defining structs

   ## Examples

        defmodule Models do
          import DefStructPlusPlus

          defstruct Blob, content: nil, created: nil
        end
   """
  defmacro defstruct(name, attrs, code_block \\ nil ) do
    quote do
      defmodule unquote(name) do
        defstruct unquote(attrs)

        # unquote code block
        unquote(code_block)
      end
    end
  end
end


defmodule Models do
  import DefStructPlusPlus

  defstruct Blob, id: nil, content: nil, created: nil do

      defimpl String.Chars do
        def to_string(blob) do
          "Blob ##{blob.id} <#{blob.created}>"
        end
      end

  end

  defstruct User, username: nil, email: nil, password: nil do

    defimpl String.Chars do
      def to_string(user) do
        "username: #{user.username}, email:  #{user.email}"
      end
    end
  end
end


defmodule Test do
  require Models
  alias Models.User, as: User

  def dummy_user() do
    %User{:username => "Mawuli", :email => "[email protected]"} 
    |> to_string
  end
end


# to run, start iex
# c "defstructplusplus.ex"
# Test.dummy_user