issues: 1125297737
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| id | node_id | number | title | user | state | locked | assignee | milestone | comments | created_at | updated_at | closed_at | author_association | pull_request | body | repo | type | active_lock_reason | performed_via_github_app | reactions | draft | state_reason |
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| 1125297737 | I_kwDOCGYnMM5DEq5J | 402 | Advanced class-based `conversions=` mechanism | 9599 | open | 0 | 14 | 2022-02-06T19:47:41Z | 2022-02-16T10:18:55Z | OWNER | The `conversions=` parameter works like this at the moment: https://sqlite-utils.datasette.io/en/3.23/python-api.html#converting-column-values-using-sql-functions ```python db["places"].insert( {"name": "Wales", "geometry": wkt}, conversions={"geometry": "GeomFromText(?, 4326)"}, ) ``` This proposal is to support values in that dictionary that are objects, not strings, which can represent more complex conversions - spun out from #399. New proposed mechanism: ```python from sqlite_utils.utils import LongitudeLatitude db["places"].insert( { "name": "London", "point": (-0.118092, 51.509865) }, conversions={"point": LongitudeLatitude}, ) ``` Here `LongitudeLatitude` is a magical value which does TWO things: it sets up the `GeomFromText(?, 4326)` SQL function, and it handles converting the `(51.509865, -0.118092)` tuple into a `POINT({} {})` string. This would involve a change to the `conversions=` contract - where it usually expects a SQL string fragment, but it can also take an object which combines that SQL string fragment with a Python conversion function. Best of all... this resolves the `lat, lon` v.s. `lon, lat` dilemma because you can use `from sqlite_utils.utils import LongitudeLatitude` OR `from sqlite_utils.utils import LatitudeLongitude` depending on which you prefer! _Originally posted by @simonw in https://github.com/simonw/sqlite-utils/issues/399#issuecomment-1030739566_ | 140912432 | issue | {"url": "https://api.github.com/repos/simonw/sqlite-utils/issues/402/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} |