updated to version 0.2.0, which now supports (and is tested against) most of draft 4, 6, 7, 2019, and 2020, also produces better error messages for anyOf, and oneOf filters, as well as “ref traces” for if your schema validation jumps around several references.

updated exonerate to version 0.3.0, almost complete support for JSONSchema draft 2020-09.

A few highlights of changes:

• completely changed macro architecture
• respects ids as URIs, has correct id resolution
• able to obtain remoteRfs
• optional RFC/standards-correct parsing of all "standardized format"s as set forth in the JSONSchema standard.

Benchmarks (generally ~3-5x faster than ExJsonSchema/JsonXema) are shown here: Exonerate/bench/reports/lib-bench.md at master · E-xyza/Exonerate · GitHub

I should probably give a concrete example. Supposing the schemas stored in the database are yours and not users’ you could do this:

defmodule MyApp.Validators do
  def make_from_db do
    Db.Schemas.get_all()
    |> Enum.map(&to_module/1)
    |> Enum.each(&Code.compile_quoted/1)
    :ok
  end
  defp to_module(schema) do
    module_name = :"validator_#{schema.name}"
    module_schema = Jason.encode!(schema.json) # assuming it's JSONB column
    common_options = [...]
    quote do
      defmodule unquote(module_name) do
        require Exonerate
        Exonerate.function_from_string(:def, :validate, unquote(module_schema), unquote(common_options))
      end
    end
  end
end