@graphile/postgis

PostGIS support for PostGraphile

Showing:

Popularity

Downloads/wk

1.4K

GitHub Stars

76

Maintenance

Last Commit

1mo ago

Contributors

7

Package

Dependencies

4

Size (min+gzip)

5.6KB

License

MIT

Type Definitions

Tree-Shakeable

No?

Categories

Readme

@graphile/postgis

This is a PostGraphile schema plugin that provides support for the popular PostGIS spatial database system.

Create a PostgreSQL database with PostGIS columns, run PostGraphile with this plugin, and have a fully functional geospatial-aware GraphQL API for your database.

Roadmap

Work is ongoing, here's the plan:

  • Read-only support for geojson field from all geography types (via a shared GraphQL interface)
  • Add GraphQL types for all the expected geography types (implementing this interface)
  • Read-only support for determining the geometry sub-types of columns and exposing these directly (rather than the interface)
  • Read-only support for longitude and latitude on geography(POINT) columns
  • Read-only support for viewing the list of geometries in a geography(GEOMETRYCOLLECTION)
  • Read-only support for a list of points (longitude and latitude) on geography(LINESTRING) and geography(POLYGON) columns
  • Create/update/null support for geography(POINT) columns
  • Create/update/null support for geography(LINESTRING) and geography(POLYGON) columns
  • Integration with postgraphile-plugin-connection-filter to enable PostGIS specific filtering (via postgraphile-plugin-connection-filter-postgis)
  • Read-only support for computed attributes on geography(LINESTRING) and geography(POLYGON), such as area, length, perimeter, and centroid - currently possible by adding a plugin and consuming the GeoJSON directly.

There are many, many other features that this plugin could support - if you have specific needs please get in touch!

Usage

This plugin requires PostGraphile v4.4.0 or higher to function correctly.

Add PostGIS to your database:

CREATE EXTENSION IF NOT EXISTS postgis WITH SCHEMA public;

Load the plugin:

postgraphile --append-plugins @graphile/postgis

Querying and mutating

Using this table as example:

CREATE TABLE data (
  id UUID PRIMARY KEY DEFAULT uuid_generate_v1mc(),
  geom_point geometry(Point, 4326) default null
);

In queries geom_point is represented as type GeometryPoint. Example:

query {
  allDatas {
    nodes {
      geomPoint {
        geojson
        srid
        x
        y
      }
    }
  }
}

In mutations geom_point is represented as type GeoJSON. Example:

mutation ($id: UUID!, $geomPoint: GeoJSON!) {
  updateDataById(
    input: {
      id: $id,
      dataPatch: {
        geomPoint: $geomPoint
      }
    }
  ) { ... }
}

with these variables:

{
  "id": "0116254a-0146-11ea-8418-4f89d6596247",
  "geomPoint": {
    "type": "Point",
    "coordinates": [8.5, 47.5]
  }
}

Beware of the fact that since 2016 the GeoJSON spec expects the coordinates to be of SRID 4326/WGS84 (see https://tools.ietf.org/html/rfc7946#section-4). So adding a crs field to the GeoJSON is deprecated. Thus since v3 PostGIS will be happy to receive above GeoJSON.

In earlier versions PostGIS expects a SRID to be passed. So the variables would be:

{
  "id": "0116254a-0146-11ea-8418-4f89d6596247",
  "geomPoint": {
    "type": "Point",
    "coordinates": [8.5, 47.5],
    "crs": {
      "type": "name",
      "properties": {
        "name": "urn:ogc:def:crs:EPSG::4326"
      }
    }
  }
}

Development

Contributions are extremely welcome! To get started, clone down this repo and then:

createdb graphile_test
export TEST_DATABASE_URL=postgres://localhost:5432/graphile_test
yarn
yarn dev

Note the development server runs at http://localhost:5123/graphiql

To run the tests:

yarn test

Rate & Review

Great Documentation0
Easy to Use0
Performant0
Highly Customizable0
Bleeding Edge0
Responsive Maintainers0
Poor Documentation0
Hard to Use0
Slow0
Buggy0
Abandoned0
Unwelcoming Community0
100
No reviews found
Be the first to rate

Alternatives

No alternatives found

Tutorials

No tutorials found
Add a tutorial