Bug with href-schema prevents the use of all kinds of filters

[adonig]

Describe the bug Trying to use the is_nil filter on a string field raises an InvalidQuery error:

Expected "string", got %{"is_nil" => "false"}, at ["filter", "string_field"].

To Reproduce Try something like /api/resources?filter[string_field][is_nil]=false

Expected behavior It should respond with resources where the string field is not nil.

Runtime

• Elixir 1.15.6
• Erlang 26.1.1
• Fedora Linux 38
• Ash 2.15.7
• AshJsonApi 0.33.1

Additional context The problem seems to be that the href_schema expects the field's filter to be of type string.

[adonig]

Fixed by #102