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Package containing all AMI Models shared between micro-services.

Retired package: Security issue - retiring
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ami lib ami unit_lesson.ex
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lib/ami/unit_lesson.ex 

defmodule Ami.UnitLesson do

  use Ecto.Schema



  import Ecto.{

    Query,

    Changeset

  }



  alias Ami.{

    Repo,

    Unit,

    Lesson

  }



  schema "unit_lessons" do

    field(:position, :integer)



    belongs_to(:unit, Unit)

    belongs_to(:lesson, Lesson)

  end



  def changeset(struct, params \\ %{}) do

    struct

    |> cast(params, [:unit_id, :lesson_id, :position])

    |> set_position

  end



  defp set_position(%Ecto.Changeset{params: %{"unit_id" => ""}} = changeset) do

    changeset

  end

  defp set_position(%Ecto.Changeset{params: %{}} = changeset) do

    changeset

  end

  defp set_position(changeset) do

    unit_id = changeset.params["unit_id"]

    last_unit_lesson =

      from(ul in __MODULE__,where: ul.unit_id == ^unit_id)

      |> last(:position)

      |> Repo.one()

    if last_unit_lesson do

      put_change(changeset, :position, last_unit_lesson.position + 1)

    else

      put_change(changeset, :position, 0)

    end

  end



  def update_position(unit_lesson_id, position) do

    Repo.get(__MODULE__, unit_lesson_id)

    |> change(%{position: position})

    |> Repo.update()

  end



end