Add permalink virtual field to items table#6
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| .pytest_cache | ||
| *.egg-info No newline at end of file | ||
| *.egg-info | ||
| build |
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this was created as a result of pip install . - if that's not the correct way to work locally, then we can remove.
| As you make changes to the code, you can re-run it using: | ||
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| ```sh | ||
| .venv/bin/hacker-news-to-sqlite |
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This whole section is basically a total guess. If you have a different process (that you can either document or link) that would be super helpful!
| ) | ||
| # includes hidden columns | ||
| all_column_names = { | ||
| c[1] for c in db.execute("PRAGMA table_xinfo([items])").fetchall() |
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Generated columns are hidden and are thus not included in db['items'].column_dict
| c[1] for c in db.execute("PRAGMA table_xinfo([items])").fetchall() | ||
| } | ||
| if "permalink" not in all_column_names: | ||
| db.execute( |
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Could be improved by a resolution on simonw/sqlite-utils#411
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Also I was mulling this over a bit - making the table virtual provides backwards compatibility, but it might be better to create a real column for new databases. It'll take up space storing a lot of nearly-identical strings, but it won't incur repeated computation at runtime.
I was thinking about it in the context of adding a num_children column to make interacting with the string kids column easier. This can be done in pure sqlite as another virtual column, but it would be easier to pre-compute it in new databases (and provide a virtual table for existing ones)
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@simonw can you take a look when you have a chance? |
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I added a virtual column (no storage overhead) to the output that easily links back to the source. It works nicely out of the box with datasette:
I got bit a bit by simonw/sqlite-utils#411, so I went with a manual
table_xinfoand creating the table via execute. Happy to adjust if that issue moves, but this seems like it works.I also added my best-guess instructions for local development on this package. I'm shooting in the dark, so feel free to replace with how you work on it locally.