Ash FrameworkAF
Ash Framework•3y ago•
6 replies
Blibs

Custom type don't show all possible filters in GraphQL Api

In my project I have the following type:

defmodule Marketplace.Ash.Types.Currency do
  @moduledoc false

  use Ash.Type

  @impl true
  def storage_type, do: :decimal

  @impl true
  def cast_input(nil, _), do: {:ok, nil}

  def cast_input(value, _) do
    case Money.parse(value) do
      {:ok, value} -> {:ok, Money.to_decimal(value)}
      :error -> {:error, [reason: "failed to parse value"]}
    end
  end

  @impl true
  def cast_stored(nil, _), do: {:ok, nil}
  def cast_stored(value, _), do: {:ok, Money.parse!(value)}

  @impl true
  def dump_to_native(nil, _), do: {:ok, nil}
  def dump_to_native(%Decimal{} = value, _), do: {:ok, value}
  def dump_to_native(%Money{} = value, _), do: {:ok, Money.to_decimal(value)}
  def dump_to_native(_, _), do: :error

  def graphql_type, do: :money
end


I use it inside a resource like this:

attribute :price, Currency, allow_nil?: false


The issue I'm having is that now I can't see all the default filters that AshGraphQL generate for built-in supported fields.

So, in this case, AshGraphQL will generate a PropertyFilterPrice type which only have a isNil option, where, before, then that field was a :decimal, it would show a bunch of filter options like eq, greaterThan, greaterThanOrEqual, in, etc.

So, the question is, what is the correct approach to implement or make these filters available for custom types?
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