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
1578790070,I_kwDOCGYnMM5eGmy2,527,`Table.convert()` skips falsey values,167893,closed,0,,,5,2023-02-10T00:00:52Z,2023-05-09T21:15:05Z,2023-05-08T21:03:24Z,CONTRIBUTOR,,"# Summary

By design, `Table.convert()` does [not attempt](https://github.com/simonw/sqlite-utils/blob/fc221f9b62ed8624b1d2098e564f525c84497969/sqlite_utils/db.py#L2663) conversion of falsey values (`None`, `""""`, `0`, ...). This is surprising (directly contradicts the docstring) and `convert()` may quietly skip cells where the user assumed a conversion would take place. 

# Example
Increment a column of integers by one

``` python
from sqlite_utils import Database

db = Database(memory=True)
table = db['table']
col = 'x'
table.insert_all([{col: 0}, {col:1}])
print(table.get(1)) # 0
print(table.get(2)) # 1
print()

table.convert(col, lambda x: x+1)
print(table.get(1)) # got 0, expected 1 ⚠⚠⚠
print(table.get(2)) # got 2, expected 2
```

Another example might be, say, transforming cells containing empty string to `NULL`.

# Discussion

This was, I think, a pragmatic choice so that consumers can skip writing guard clauses for these falsey values (particularly from the CLI). But this surprising undocumented behavior can lead to incorrect data. I don't think this is a good trade-off between convenience and correctness.

In the absence of this convenience users will either have to write guard clauses into their conversion expressions (or adapt the called function to do the same), so: 
``` python
    fn(value) if value else value
```
instead of:
``` python
    fn(value)
```
This is more typing and sometimes I will forget, and there will be errors. (But they will be noisy errors, which is a good thing).

Such a change will certainly inconvenience some existing consumers; there will be some breakage. But I think this is worth it to avoid quietly not converting some values by default, which can lead to quietly bad data.

I have a PR that I will attach, please take a look and see what you think.",140912432,issue,,,"{""url"": ""https://api.github.com/repos/simonw/sqlite-utils/issues/527/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed
860625833,MDU6SXNzdWU4NjA2MjU4MzM=,1300,Make row available to `render_cell` plugin hook,3243482,closed,0,,,5,2021-04-18T10:14:37Z,2022-07-07T16:34:05Z,2022-07-07T16:31:22Z,CONTRIBUTOR,,"*Original title: **Generating URL for a row inside `render_cell` hook***

Hey,
I am using Datasette to view a database that contains video metadata. It has BLOB columns that contain video thumbnails in JPG format (around 100-500KB per row). 

I've registered an output formatter that extends `datasette.blob_renderer.render_blob` function and serves the column with `image/jpeg` content type.

```python
from datasette.blob_renderer import render_blob

async def render_jpg(datasette, database, rows, columns, request, table, view_name):
    response = await render_blob(datasette, database, rows, columns, request, table, view_name)
    response.content_type = ""image/jpeg""
    response.headers[""Content-Disposition""] = f'inline; filename=""image.jpg""'
    return response


@hookimpl
def register_output_renderer():
    return {
        ""extension"": ""jpg"",
        ""render"": render_jpg,
        ""can_render"": lambda: True,
    }
```

This works well. I can visit `http://localhost:8001/mydb/videos/1.jpg?_blob_column=thumbnail` and view the image.

I want to display the image directly with an `<img>` tag (lazy-loaded of course). So, I need a URL, because embedding base64 would increase the page size too much (each image > 100KB). 

Datasette generates a link with `.blob` extension for blob columns. It does this by calling `datasette.urls.row_blob`

https://github.com/simonw/datasette/blob/7a2ed9f8a119e220b66d67c7b9e07cbab47b1196/datasette/views/table.py#L169-L179

But I have no way of getting the row inside the `render_cell` hook. 

```python
@hookimpl
def render_cell(value, column, table, database, datasette):
    if isinstance(value, bytes) and imghdr.what(None, value):
        # generate url
        return '$renderedLink'
```

Any pointers?",107914493,issue,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/1300/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed
1114147905,I_kwDOBm6k_c5CaIxB,1612,Move canned queries closer to the SQL input area,639012,closed,0,,3268330,5,2022-01-25T17:06:39Z,2022-03-19T04:04:49Z,2022-01-25T18:34:21Z,CONTRIBUTOR,,"*Original title:  Consider placing example queries above the sql input?*

Hi! Have been enjoying deploying ad hoc datasettes for collaborators to pick over! 

I keep finding myself manually ""fixing"" the database.html template so that the ""example queries"" (canned queries) appear directly *over* the sql box? So they are sorta more a suggestion for collaborators who aren't inclined to write their own queries? 

My sense is any time I go to the trouble of writing canned queries my users should see 'em? 

(( I have also considered a client-side reactive-ish option where selecting a query just places the raw SQL in the box and doesn't execute it, but this seems to end up being an inconvenience, rather than a teaching tool. )) 

",107914493,issue,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/1612/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed
1105916061,I_kwDOBm6k_c5B6vCd,1601,Add KNN and data_licenses to hidden tables list,25778,closed,0,,,5,2022-01-17T14:19:57Z,2022-01-20T21:29:44Z,2022-01-20T04:38:54Z,CONTRIBUTOR,,"They're generated by Spatialite and not very interesting in most cases.

<img width=""626"" alt=""Screen Shot 2022-01-17 at 9 17 31 AM"" src=""https://user-images.githubusercontent.com/25778/149786443-7832363c-2a2c-4533-9edc-048cd00e4a08.png"">

",107914493,issue,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/1601/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed
893890496,MDU6SXNzdWU4OTM4OTA0OTY=,1332,?_facet_size=X to increase number of facets results on the page,192568,closed,0,,,5,2021-05-18T02:40:16Z,2021-05-27T16:13:07Z,2021-05-23T00:34:37Z,CONTRIBUTOR,,"Is there a way to add a parameter to the URL to modify default_facet_size?

LIkewise, a way to produce a link on the three dots to expand to all items (or match previous number of items, or add x more)?

",107914493,issue,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/1332/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed
275814941,MDU6SXNzdWUyNzU4MTQ5NDE=,141,datasette publish can fail if /tmp is on a different device,21148,closed,0,,2949431,5,2017-11-21T18:28:05Z,2020-04-29T03:27:54Z,2017-12-08T16:06:36Z,CONTRIBUTOR,,"`datasette publish` uses hard links to avoid copying the db into a tmp directory. This can fail if `/tmp` is on another device, because hardlinks can't cross devices. You'll see something like this:

```
$ datasette publish heroku whatever.db
...
OSError: [Errno 18] Invalid cross-device link: '/mnt/c/Users/jacob/c/datasette/whatever.db' -> '/tmp/tmpvxq2yof6/whatever.db'
```
[In my case this is failing because I'm on a Windows machine, using WSL, so my code's on a different virtual filesystem from the Linux subsystem, Because Reasons.]

I'm not sure if it's possible to detect this (can you figure out which device `/tmp` is on?), or what the fallback should be (soft link? copy?).",107914493,issue,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/141/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed