html_url,issue_url,id,node_id,user,user_label,created_at,updated_at,author_association,body,reactions,issue,issue_label,performed_via_github_app
https://github.com/simonw/sqlite-utils/issues/402#issuecomment-1035057014,https://api.github.com/repos/simonw/sqlite-utils/issues/402,1035057014,IC_kwDOCGYnMM49sbd2,25778,eyeseast,2022-02-10T15:30:28Z,2022-02-10T15:30:40Z,CONTRIBUTOR,"Yeah, the CLI experience is probably where any kind of multi-column, configured setup is going to fall apart. Sticking with GIS examples, one way I might think about this is using the [fiona CLI](https://fiona.readthedocs.io/en/latest/cli.html):

```sh
# assuming a database is already created and has SpatiaLite
fio cat boundary.shp | sqlite-utils insert boundaries --conversion geometry GeometryGeoJSON -
```

Anyway, very interested to see where you land here.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1125297737,Advanced class-based `conversions=` mechanism,
https://github.com/simonw/sqlite-utils/issues/402#issuecomment-1032732242,https://api.github.com/repos/simonw/sqlite-utils/issues/402,1032732242,IC_kwDOCGYnMM49jj5S,25778,eyeseast,2022-02-08T15:26:59Z,2022-02-08T15:26:59Z,CONTRIBUTOR,"What if you did something like this:

```python

class Conversion:
    def __init__(self, *args, **kwargs):
        ""Put whatever settings you need here""

    def python(self, row, column, value): # not sure on args here
        ""Python step to transform value""
        return value

    def sql(self, row, column, value):
        ""Return the actual sql that goes in the insert/update step, and maybe params""
        # value is the return of self.python()
        return value, []
```

This way, you're always passing an instance, which has methods that do the conversion. (Or you're passing a SQL string, as you would now.) The `__init__` could take column names, or SRID, or whatever other setup state you need per row, but the row is getting processed with the `python` and `sql` methods (or whatever you want to call them). This is pretty rough, so do what you will with names and args and such.

You'd then use it like this:

```python
# subclass might be unneeded here, if methods are present
class LngLatConversion(Conversion):
    def __init__(self, x=""longitude"", y=""latitude""):
        self.x = x
        self.y = y

    def python(self, row, column, value):
        x = row[self.x]
        y = row[self.y]
        return x, y

    def sql(self, row, column, value):
        # value is now a tuple, returned above
        s = ""GeomFromText(POINT(? ?))""
        return s, value

table.insert_all(rows, conversions={""point"": LngLatConversion(""lng"", ""lat""))}
```

I haven't thought through all the implementation details here, and it'll probably break in ways I haven't foreseen, but wanted to get this idea out of my head. Hope it helps.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1125297737,Advanced class-based `conversions=` mechanism,
https://github.com/simonw/sqlite-utils/issues/402#issuecomment-1031791783,https://api.github.com/repos/simonw/sqlite-utils/issues/402,1031791783,IC_kwDOCGYnMM49f-Sn,25778,eyeseast,2022-02-07T18:37:40Z,2022-02-07T18:37:40Z,CONTRIBUTOR,"I've never used it either, but it's interesting, right? Feel like I should try it for something. 

I'm trying to get my head around how this conversions feature might work, because I really like the idea of it.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1125297737,Advanced class-based `conversions=` mechanism,
https://github.com/simonw/sqlite-utils/issues/402#issuecomment-1031779460,https://api.github.com/repos/simonw/sqlite-utils/issues/402,1031779460,IC_kwDOCGYnMM49f7SE,25778,eyeseast,2022-02-07T18:24:56Z,2022-02-07T18:24:56Z,CONTRIBUTOR,"I wonder if there's any overlap with the goals here and the `sqlite3` module's concept of adapters and converters: https://docs.python.org/3/library/sqlite3.html#sqlite-and-python-types

I'm not sure that's _exactly_ what we're talking about here, but it might be a parallel with some useful ideas to borrow.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1125297737,Advanced class-based `conversions=` mechanism,