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shankardevy/line_item.ex Secret

Last active July 8, 2017 11:22
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  1. shankardevy revised this gist Jul 8, 2017. 1 changed file with 4 additions and 0 deletions.
    4 changes: 4 additions & 0 deletions line_item.ex
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    Original file line number Diff line number Diff line change
    @@ -1,5 +1,9 @@
    defmodule Mango.Sales.LineItem do
    use Ecto.Schema

    import Ecto.Changeset
    alias Mango.Catalog
    alias Mango.Sales.LineItem

    embedded_schema do
    field :product_id, :integer
  2. shankardevy created this gist Jul 8, 2017.
    40 changes: 40 additions & 0 deletions line_item.ex
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    Original file line number Diff line number Diff line change
    @@ -0,0 +1,40 @@
    defmodule Mango.Sales.LineItem do
    use Ecto.Schema

    embedded_schema do
    field :product_id, :integer
    field :product_name, :string
    field :pack_size, :string
    field :quantity, :integer
    field :unit_price, :decimal
    field :total, :decimal
    end

    @doc false
    def changeset(%LineItem{} = line_item, attrs) do
    line_item
    |> cast(attrs, [:product_id, :product_name, :pack_size, :quantity, :unit_price, :total])
    |> set_product_details
    |> set_total
    |> validate_required([:product_id, :product_name, :pack_size, :quantity, :unit_price])
    end

    defp set_product_details(changeset) do
    case get_change(changeset, :product_id) do
    nil -> changeset
    product_id ->
    product = Catalog.get_product!(product_id)
    changeset
    |> put_change(:product_name, product.name)
    |> put_change(:unit_price, product.price)
    |> put_change(:pack_size, product.pack_size)
    end
    end

    defp set_total(changeset) do
    quantity = get_field(changeset, :quantity) |> Decimal.new
    unit_price = get_field(changeset, :unit_price)
    changeset
    |> put_change(:total, Decimal.mult(unit_price, quantity))
    end
    end