defmodule YourApp.Schemas.Options struct
    use Ecto.Schema

    schema "options" do
        field :key, :string
        field :value, :string
    end

    def changeset(%__MODULE__{} = option, attrs \\ %{}) do
        option
        |> cast([:key, :value])

    end

    def create_changeset(attrs \\ %{}) do
        %__MODULE__{}
        |> changeset(attrs)
        |> validate()
    end

    def update_changeset(%__MODULE__{} = option, attrs \\ %{}) do
        option
        |> changeset(attrs)
        |> validate()
    end

    defp validate(changeset) do
        changeset
        |> validate_required(:key)
        |> validate_required(:value)
        |> unique_constraint([:key])
    end
end