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  • Table view should support filtering via many-to-many relationships · 10 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions issue performed_via_github_app
495079705 https://github.com/simonw/datasette/issues/355#issuecomment-495079705 https://api.github.com/repos/simonw/datasette/issues/355 MDEyOklzc3VlQ29tbWVudDQ5NTA3OTcwNQ== simonw 9599 2019-05-23T06:03:40Z 2019-05-23T06:04:03Z OWNER

I think an approach similar to how ?_where= works would do the job here.

Can address this feedback from @psychemedia while I'm at it: https://github.com/simonw/datasette/issues/429#issuecomment-483202658

 
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 Table view should support filtering via many-to-many relationships 346027040  
495079393 https://github.com/simonw/datasette/issues/355#issuecomment-495079393 https://api.github.com/repos/simonw/datasette/issues/355 MDEyOklzc3VlQ29tbWVudDQ5NTA3OTM5Mw== simonw 9599 2019-05-23T06:02:11Z 2019-05-23T06:02:11Z OWNER

I'm re-opening because we need a UI mechanism for deselecting this:

 
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 Table view should support filtering via many-to-many relationships 346027040  
495077528 https://github.com/simonw/datasette/issues/355#issuecomment-495077528 https://api.github.com/repos/simonw/datasette/issues/355 MDEyOklzc3VlQ29tbWVudDQ5NTA3NzUyOA== simonw 9599 2019-05-23T05:53:20Z 2019-05-23T05:53:20Z OWNER

Demo: https://latest.datasette.io/fixtures/roadside_attractions?_through={%22table%22:%22roadside_attraction_characteristics%22,%22column%22:%22characteristic_id%22,%22value%22:%221%22}

 
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 Table view should support filtering via many-to-many relationships 346027040  
495077443 https://github.com/simonw/datasette/issues/355#issuecomment-495077443 https://api.github.com/repos/simonw/datasette/issues/355 MDEyOklzc3VlQ29tbWVudDQ5NTA3NzQ0Mw== simonw 9599 2019-05-23T05:52:52Z 2019-05-23T05:52:52Z OWNER 
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 Table view should support filtering via many-to-many relationships 346027040  
495061686 https://github.com/simonw/datasette/issues/355#issuecomment-495061686 https://api.github.com/repos/simonw/datasette/issues/355 MDEyOklzc3VlQ29tbWVudDQ5NTA2MTY4Ng== simonw 9599 2019-05-23T04:21:00Z 2019-05-23T04:21:00Z OWNER

Filtering through one table already works - you need to know that table's primary key, then you do ?column_id=pk against the first table.

Filtering through a m2m table will be handled by the new ?_through= parameter.

I'm going to leave out filtering through a second levels of joins for the moment. Potentially that could be added later as some extra complicated JSON.

 
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 Table view should support filtering via many-to-many relationships 346027040  
495059236 https://github.com/simonw/datasette/issues/355#issuecomment-495059236 https://api.github.com/repos/simonw/datasette/issues/355 MDEyOklzc3VlQ29tbWVudDQ5NTA1OTIzNg== simonw 9599 2019-05-23T04:03:04Z 2019-05-23T04:03:04Z OWNER

This assumes that our current table has a single, unambiguous foreign key relationship with the table indicated by the ?through= parameter.

I think that's reasonable. The JSON format could be extended to allow that side of the relationship to optionally be defined there (if the foreign key relationship is missing).

 
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 Table view should support filtering via many-to-many relationships 346027040  
495058964 https://github.com/simonw/datasette/issues/355#issuecomment-495058964 https://api.github.com/repos/simonw/datasette/issues/355 MDEyOklzc3VlQ29tbWVudDQ5NTA1ODk2NA== simonw 9599 2019-05-23T04:01:17Z 2019-05-23T04:01:17Z OWNER

I think I like this better. I don't think ?_m2m= is the correct name for it though.

?_through={"table":"ad_targets","column":"target_id","value":"ec3ac"} feels a little more accurate.

 
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 Table view should support filtering via many-to-many relationships 346027040  
495058828 https://github.com/simonw/datasette/issues/355#issuecomment-495058828 https://api.github.com/repos/simonw/datasette/issues/355 MDEyOklzc3VlQ29tbWVudDQ5NTA1ODgyOA== simonw 9599 2019-05-23T04:00:27Z 2019-05-23T04:00:27Z OWNER

The alternative would be to use JSON:

?_m2m={"table":"ad_targets","column":"target_id","value":"ec3ac"}

 
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 Table view should support filtering via many-to-many relationships 346027040  
495058622 https://github.com/simonw/datasette/issues/355#issuecomment-495058622 https://api.github.com/repos/simonw/datasette/issues/355 MDEyOklzc3VlQ29tbWVudDQ5NTA1ODYyMg== simonw 9599 2019-05-23T03:58:58Z 2019-05-23T03:58:58Z OWNER

So the design I have so far is:

?_m2m_linktablename__linktablecolumn=value

I'm concerned that this doesn't take tables or columns with __ in their name into account. Does that matter? Could I support this without them?

 
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 Table view should support filtering via many-to-many relationships 346027040  
409087871 https://github.com/simonw/datasette/issues/355#issuecomment-409087871 https://api.github.com/repos/simonw/datasette/issues/355 MDEyOklzc3VlQ29tbWVudDQwOTA4Nzg3MQ== simonw 9599 2018-07-31T04:06:22Z 2018-07-31T04:06:22Z OWNER 
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 Table view should support filtering via many-to-many relationships 346027040  

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