Validation breaks Money in Phoenix 1.7

[maxgronlund]

Issue with Price Field in LiveView Form

Thanks for the great Money package!

I have a price field declared like this:

schema "product" do
  field :price, Money.Ecto.Amount.Type
  field :some_other_field, :integer
end

I also used the validator from the documentation.

In the LiveView's form component, I'm using <.simple_form>. To get the input to display anything at all, I updated the input like this:

<.input
  field={@form[:price]}
  value={money_to_decimal(Phoenix.HTML.Form.input_value(@form, :price))}
  type="number"
  label="Price"
  step="0.5"
/>

I also created this helper function to avoid crashes when the price is invalid:

defp money_to_decimal(input_value) do
  case input_value do
    %Money{} -> Money.to_decimal(input_value)
    _ -> input_value
  end
end

However, I've discovered an issue: when I update some_other_field twice (e.g., by selecting it in the UI and pressing the "up" arrow key twice), the price starts increasing by a factor of 100.

I hope my explanation is clear. If not, feel free to reach out! I'd love to help resolve this and improve the experience. I think Money is a fantastic Hex package that everyone should use.

Best regards,
Max