JSON to Elixir Ecto Schema & Changeset Generator

defmodule MyApp.Orders.Order do
  @moduledoc """
  Ecto schema for `orders`.
  Generated automatically with ToolsAA 100% Client-Side Engine.
  """
  use Ecto.Schema
  import Ecto.Changeset

  @primary_key {:id, :binary_id, autogenerate: true}
  @foreign_key_type :binary_id
  @derive {Jason.Encoder, only: [:id, :order_id, :order_number, :customer, :shipping_address, :items, :subtotal, :tax_amount, :total_amount, :currency, :is_fulfilled, :payment_status, :notes, :placed_at]}

  @type t :: %__MODULE__{}

  schema "orders" do
    field :order_id, :binary_id
    field :order_number, :string
    embeds_one :customer, MyApp.Orders.Order.Customer, on_replace: :update
    embeds_one :shipping_address, MyApp.Orders.Order.ShippingAddress, on_replace: :update
    embeds_many :items, MyApp.Orders.Order.Item, on_replace: :delete
    field :subtotal, :float
    field :tax_amount, :float
    field :total_amount, :float
    field :currency, :string
    field :is_fulfilled, :boolean
    field :payment_status, :string
    field :notes, :string
    field :placed_at, :utc_datetime

    timestamps(type: :utc_datetime)
  end

  @required_fields [:order_id, :order_number, :subtotal, :tax_amount, :total_amount, :currency, :payment_status, :placed_at]
  @optional_fields [:is_fulfilled, :notes]

  @doc false
  def changeset(model, attrs) do
    model
    |> cast(attrs, @required_fields ++ @optional_fields)
    |> validate_required(@required_fields)
    |> validate_format(:order_id, ~r/^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i, message: "must be a valid UUID")
    |> validate_number(:subtotal, greater_than_or_equal_to: 0)
    |> validate_number(:tax_amount, greater_than_or_equal_to: 0)
    |> validate_number(:total_amount, greater_than_or_equal_to: 0)
    |> cast_embed(:customer, required: true)
    |> cast_embed(:shipping_address, required: true)
    |> cast_embed(:items)
  end
end

defmodule MyApp.Orders.Order.Customer do
  @moduledoc """
  Embedded schema representing `MyApp.Orders.Order.Customer`.
  """
  use Ecto.Schema
  import Ecto.Changeset

  @derive {Jason.Encoder, only: [:customer_id, :full_name, :email, :phone_number, :is_vip]}
  @primary_key false
  embedded_schema do
    field :customer_id, :string
    field :full_name, :string
    field :email, :string
    field :phone_number, :string
    field :is_vip, :boolean
  end

  @doc false
  def changeset(struct_or_changeset, attrs) do
    struct_or_changeset
    |> cast(attrs, [:customer_id, :full_name, :email, :phone_number, :is_vip])
    |> validate_required([:customer_id, :full_name, :email, :phone_number])
    |> validate_format(:email, ~r/^[^s]+@[^s]+$/, message: "must have the @ sign and no spaces")
  end
end

defmodule MyApp.Orders.Order.ShippingAddress do
  @moduledoc """
  Embedded schema representing `MyApp.Orders.Order.ShippingAddress`.
  """
  use Ecto.Schema
  import Ecto.Changeset

  @derive {Jason.Encoder, only: [:street, :city, :state, :postal_code, :country_code]}
  @primary_key false
  embedded_schema do
    field :street, :string
    field :city, :string
    field :state, :string
    field :postal_code, :string
    field :country_code, :string
  end

  @doc false
  def changeset(struct_or_changeset, attrs) do
    struct_or_changeset
    |> cast(attrs, [:street, :city, :state, :postal_code, :country_code])
    |> validate_required([:street, :city, :state, :postal_code, :country_code])
  end
end

defmodule MyApp.Orders.Order.Item do
  @moduledoc """
  Embedded schema representing `MyApp.Orders.Order.Item`.
  """
  use Ecto.Schema
  import Ecto.Changeset

  @derive {Jason.Encoder, only: [:sku, :title, :quantity, :unit_price, :discount_rate, :in_stock]}
  @primary_key false
  embedded_schema do
    field :sku, :string
    field :title, :string
    field :quantity, :integer
    field :unit_price, :float
    field :discount_rate, :float
    field :in_stock, :boolean
  end

  @doc false
  def changeset(struct_or_changeset, attrs) do
    struct_or_changeset
    |> cast(attrs, [:sku, :title, :quantity, :unit_price, :discount_rate, :in_stock])
    |> validate_required([:sku, :title, :quantity, :unit_price, :discount_rate])
    |> validate_number(:quantity, greater_than_or_equal_to: 0)
    |> validate_number(:unit_price, greater_than_or_equal_to: 0)
    |> validate_number(:discount_rate, greater_than_or_equal_to: 0)
  end
end