feat(farm_field_geo): PostGIS polygon + auto-computed acreage

farm_field_geo/README.rst

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+.. image:: https://odoo-community.org/readme-banner-image
+   :target: https://odoo-community.org/get-involved?utm_source=readme
+   :alt: Odoo Community Association
+
+=======================
+Farm Field — Geospatial
+=======================
+
+.. 
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! This file is generated by oca-gen-addon-readme !!
+   !! changes will be overwritten.                   !!
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! source digest: sha256:156d6ff91db3f7522e9501d6a413cbc2a2e29881632c0f19543ed5de002262fc
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+.. |badge1| image:: https://img.shields.io/badge/maturity-Beta-yellow.png
+    :target: https://odoo-community.org/page/development-status
+    :alt: Beta
+.. |badge2| image:: https://img.shields.io/badge/license-AGPL--3-blue.png
+    :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+    :alt: License: AGPL-3
+.. |badge3| image:: https://img.shields.io/badge/github-ledoent%2Ffarm--pack-lightgray.png?logo=github
+    :target: https://github.com/ledoent/farm-pack/tree/19.0/farm_field_geo
+    :alt: ledoent/farm-pack
+
+|badge1| |badge2| |badge3|
+
+Adds PostGIS polygon boundaries to ``farm.field`` and auto-computes
+acreage from the geometry.
+
+Without this module, ``farm.field.acres`` is a manual decimal entry.
+With it, set a WGS84 polygon as the field's boundary and the acreage
+updates from the polygon area, reprojected to EPSG:5070 (Conus Albers
+Equal Area) — the projection NRCS and NASS use for lower-48 area
+calculations, so the number matches what soil-survey and yield tooling
+would report for the same parcel.
+
+``acres`` remains editable as a fallback: fields without a digitized
+boundary keep working with a manual estimate, and the compute only fires
+once a polygon is set.
+
+**Scope.** This module ships a single ``GeoPolygon`` per field —
+non-contiguous plots (two disconnected polygons that are
+administratively one "field") should be recorded as separate
+``farm.field`` records for now. A future ``farm_field_multi_polygon``
+extension can promote the column to ``GeoMultiPolygon`` if the demand
+materializes.
+
+**Install requirement.** The Postgres instance must have PostGIS
+enabled. ``base_geoengine`` declares the extension; install will fail
+cleanly if the extension is missing. The base ``farm_field`` module
+stays usable without PostGIS — install this extension only when geometry
+support is wanted.
+
+**Table of contents**
+
+.. contents::
+   :local:
+
+Usage
+=====
+
+1. Open Farm → Fields → Fields and pick a field.
+2. The **Boundary** notebook tab renders a Leaflet map of the field's
+   polygon.
+3. Set the polygon via the geoengine map view (vertex drag works there)
+   or by importing a WKT string. In-form vertex editing through the
+   boundary tab arrives once ``web_leaflet_draw_lib`` is migrated to
+   Odoo 19.
+4. Save. The **Acres** field auto-recomputes from the polygon area,
+   reprojected to EPSG:5070 Albers Equal Area.
+5. Switch the action's view to **Map** (geoengine) to see every field at
+   once.
+
+The ``acres`` field stays editable as a fallback: fields without a
+digitized boundary can carry a manual estimate. Once a polygon is set,
+the compute overrides the manual value.
+
+Multi-plot fields (a "north 40" that is two non-contiguous polygons)
+need ``GeoMultiPolygon`` rather than ``GeoPolygon`` — out of scope for
+the MVP; record each plot as its own ``farm.field`` for now.
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/ledoent/farm-pack/issues>`_.
+In case of trouble, please check there if your issue has already been reported.
+If you spotted it first, help us to smash it by providing a detailed and welcomed
+`feedback <https://github.com/ledoent/farm-pack/issues/new?body=module:%20farm_field_geo%0Aversion:%2019.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**>`_.
+
+Do not contact contributors directly about support or help with technical issues.
+
+Credits
+=======
+
+Authors
+-------
+
+* Ledo Enterprises
+
+Contributors
+------------
+
+- Daniel Kendall <dkendall@ledoweb.com>
+
+Maintainers
+-----------
+
+.. |maintainer-dnplkndll| image:: https://github.com/dnplkndll.png?size=40px
+    :target: https://github.com/dnplkndll
+    :alt: dnplkndll
+
+Current maintainer:
+
+|maintainer-dnplkndll| 
+
+This module is part of the `ledoent/farm-pack <https://github.com/ledoent/farm-pack/tree/19.0/farm_field_geo>`_ project on GitHub.
+
+You are welcome to contribute.

farm_field_geo/__init__.py

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+from . import models

farm_field_geo/__manifest__.py

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+{
+    "name": "Farm Field — Geospatial",
+    "version": "19.0.1.0.0",
+    "summary": "PostGIS polygons + auto-computed acreage for farm.field",
+    "author": "Ledo Enterprises, Odoo Community Association (OCA)",
+    "maintainers": ["dnplkndll"],
+    "website": "https://github.com/ledoent/farm-pack",
+    "license": "AGPL-3",
+    "category": "Vertical/Agriculture",
+    "depends": [
+        "farm_field",
+        "base_geoengine",
+    ],
+    "data": [
+        "views/farm_field_views.xml",
+    ],
+    "installable": True,
+    "application": False,
+}

farm_field_geo/models/__init__.py

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+from . import farm_field

farm_field_geo/models/farm_field.py

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+from odoo import api, fields, models
+
+# Square meters in one US survey acre. Used to convert EPSG:5070 area
+# (Albers Equal Area, units = m^2) to acres.
+M2_PER_ACRE = 4046.8564224
+
+# Conus Albers Equal Area — the projection NRCS and USDA use for area
+# calculations across the lower 48. We reproject the WGS84 polygon to 5070
+# before measuring area so the number matches what soil-survey and NASS
+# tooling would report for the same parcel.
+ALBERS_CONUS_SRID = 5070
+
+
+class FarmField(models.Model):
+    _inherit = "farm.field"
+
+    geom = fields.GeoPolygon(
+        string="Boundary",
+        srid=4326,
+        help="Field boundary as a WGS84 polygon. Drives the computed acreage; "
+        "stored as PostGIS geometry.",
+    )
+    acres = fields.Float(
+        compute="_compute_acres_from_geom",
+        store=True,
+        readonly=False,
+        digits=(8, 2),
+        help="Auto-computed from the polygon area when a boundary is drawn. "
+        "Editable as a fallback for fields without a digitized boundary yet.",
+    )
+
+    @api.depends("geom")
+    def _compute_acres_from_geom(self):
+        for rec in self:
+            if not rec.geom:
+                continue
+            rec.acres = rec.geom.transform(ALBERS_CONUS_SRID).area / M2_PER_ACRE

farm_field_geo/pyproject.toml

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+[build-system]
+requires = ["whool"]
+build-backend = "whool.buildapi"

farm_field_geo/readme/CONTRIBUTORS.md

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+- Daniel Kendall <dkendall@ledoweb.com>

farm_field_geo/readme/DESCRIPTION.md

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+Adds PostGIS polygon boundaries to `farm.field` and auto-computes acreage
+from the geometry.
+
+Without this module, `farm.field.acres` is a manual decimal entry. With it,
+set a WGS84 polygon as the field's boundary and the acreage updates from the
+polygon area, reprojected to EPSG:5070 (Conus Albers Equal Area) — the
+projection NRCS and NASS use for lower-48 area calculations, so the number
+matches what soil-survey and yield tooling would report for the same parcel.
+
+`acres` remains editable as a fallback: fields without a digitized boundary
+keep working with a manual estimate, and the compute only fires once a
+polygon is set.
+
+**Scope.** This module ships a single `GeoPolygon` per field — non-contiguous
+plots (two disconnected polygons that are administratively one "field")
+should be recorded as separate `farm.field` records for now. A future
+`farm_field_multi_polygon` extension can promote the column to
+`GeoMultiPolygon` if the demand materializes.
+
+**Install requirement.** The Postgres instance must have PostGIS enabled.
+`base_geoengine` declares the extension; install will fail cleanly if the
+extension is missing. The base `farm_field` module stays usable without
+PostGIS — install this extension only when geometry support is wanted.

farm_field_geo/readme/USAGE.md

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+1. Open Farm → Fields → Fields and pick a field.
+2. The **Boundary** notebook tab renders a Leaflet map of the field's polygon.
+3. Set the polygon via the geoengine map view (vertex drag works there) or by
+   importing a WKT string. In-form vertex editing through the boundary tab
+   arrives once `web_leaflet_draw_lib` is migrated to Odoo 19.
+4. Save. The **Acres** field auto-recomputes from the polygon area, reprojected
+   to EPSG:5070 Albers Equal Area.
+5. Switch the action's view to **Map** (geoengine) to see every field at once.
+
+The `acres` field stays editable as a fallback: fields without a digitized
+boundary can carry a manual estimate. Once a polygon is set, the compute
+overrides the manual value.
+
+Multi-plot fields (a "north 40" that is two non-contiguous polygons) need
+`GeoMultiPolygon` rather than `GeoPolygon` — out of scope for the MVP;
+record each plot as its own `farm.field` for now.