# `GeoGenius.PostgresTypes`
[🔗](https://github.com/agoodway/geo_genius/blob/main/deps/postgrex/lib/postgrex/type_module.ex#L1045)

A Postgrex types module registering the PostGIS extension, for hosts that do
not already define one.

No `:json` option is passed, so Postgrex resolves the JSON library itself
from `config :postgrex, :json_library`, defaulting to Jason. `:geo_genius`
depends on Jason for its own manifest files but does not choose a library for
its host: a host on Elixir 1.18 or later that configured the built-in `JSON`
keeps it, and every read projects `codes` and `attributes` as jsonb through
whichever library the host chose.

A host with its own types module adds `Geo.PostGIS.Extension` to that
instead and points its Repo at it; either way the Repo must be able to
decode geometry and jsonb before `GeoGenius.Preflight` will let it boot. See
[`guides/reading.md`](reading.md#configuring-the-repo-to-decode-geometry).

---

*Consult [api-reference.md](api-reference.md) for complete listing*