bookmark.ex

defmodule Bookmarks.Bookmark do
  use Bookmarks.Web, :model

  schema "bookmarks" do
    field :href, :string
    field :title, :string
    field :description, :string
    timestamps
  end

  @required_fields ~w(href)
  @optional_fields ~w(title description)

  def changeset(model, params \\ :empty) do
    model
    |> cast(params, @required_fields, @optional_fields)
    |> validate_length(:title, max: 255)
  end
end

## test
  test "title cannot be larger than 255 chars" do
    long_title = String.duplicate("a", 280)
    changeset = Bookmark.changeset(%Bookmark{href: "http://www.xyz.com", title: long_title})
    refute changeset.valid?
    IO.inspect(changeset)
    assert changeset.errors == [title: "too long"] ## I know this will fail but I did not expect changeset.errors => []
  end