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  • Mechanism for differentiating between "by me" and "liked by me" · 6 ✖

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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
685970384 https://github.com/dogsheep/dogsheep-beta/issues/7#issuecomment-685970384 https://api.github.com/repos/dogsheep/dogsheep-beta/issues/7 MDEyOklzc3VlQ29tbWVudDY4NTk3MDM4NA== simonw 9599 2020-09-02T20:11:41Z 2020-09-02T20:11:59Z MEMBER

Default categories:

  • 1 = created
  • 2 = saved
 
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 Mechanism for differentiating between "by me" and "liked by me" 691265198  
685966707 https://github.com/dogsheep/dogsheep-beta/issues/7#issuecomment-685966707 https://api.github.com/repos/dogsheep/dogsheep-beta/issues/7 MDEyOklzc3VlQ29tbWVudDY4NTk2NjcwNw== simonw 9599 2020-09-02T20:04:08Z 2020-09-02T20:04:08Z MEMBER

I'll make category a foreign key to a categories table so Datasette can automatically show the name column.

 
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 Mechanism for differentiating between "by me" and "liked by me" 691265198  
685966361 https://github.com/dogsheep/dogsheep-beta/issues/7#issuecomment-685966361 https://api.github.com/repos/dogsheep/dogsheep-beta/issues/7 MDEyOklzc3VlQ29tbWVudDY4NTk2NjM2MQ== simonw 9599 2020-09-02T20:03:29Z 2020-09-02T20:03:41Z MEMBER

I'm going to implement the first version of this as an indexed integer category column which has 1 for "about me" and 2 for "liked by me" - and space for other category numerals in the future, albeit a row can only belong to one category.

I'll think about a full tagging system separately.

 
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 Mechanism for differentiating between "by me" and "liked by me" 691265198  
685965516 https://github.com/dogsheep/dogsheep-beta/issues/7#issuecomment-685965516 https://api.github.com/repos/dogsheep/dogsheep-beta/issues/7 MDEyOklzc3VlQ29tbWVudDY4NTk2NTUxNg== simonw 9599 2020-09-02T20:01:54Z 2020-09-02T20:01:54Z MEMBER

Relevant post: https://sqlite.org/forum/forumpost/9f06fedaa5 - drh says:

Indexes are one-to-one. There is one entry in the index for each row in the table.

You are asking for an index that is many-to-one - multiple index entries for each table row.

A Full-Text Index is basically a many-to-one index. So if all of your array entries really are words, you could probably get this to work using a Full-Text Index.

 
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 Mechanism for differentiating between "by me" and "liked by me" 691265198  
685962280 https://github.com/dogsheep/dogsheep-beta/issues/7#issuecomment-685962280 https://api.github.com/repos/dogsheep/dogsheep-beta/issues/7 MDEyOklzc3VlQ29tbWVudDY4NTk2MjI4MA== simonw 9599 2020-09-02T19:55:26Z 2020-09-02T19:59:58Z MEMBER

Relevant: https://charlesleifer.com/blog/a-tour-of-tagging-schemas-many-to-many-bitmaps-and-more/

SQLite supports bitwise operators Binary AND (&) and Binary OR (|) - I could try those. Not sure how they interact with indexes though.

 
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 Mechanism for differentiating between "by me" and "liked by me" 691265198  
685895540 https://github.com/dogsheep/dogsheep-beta/issues/7#issuecomment-685895540 https://api.github.com/repos/dogsheep/dogsheep-beta/issues/7 MDEyOklzc3VlQ29tbWVudDY4NTg5NTU0MA== simonw 9599 2020-09-02T17:46:44Z 2020-09-02T17:46:44Z MEMBER

Some opet questions about this:

  • Should I restrict to two exclusive categories here, or should I have a generic category mechanism that can be expanded to more than two?
  • Should an item be able to exist in more than one category? Do I want to be able to mark an indexed item as both by-me and liked-by-me for example? This question is more interesting if the number of categories is greater than two.
  • How should this be modeled? Single column, multiple boolean columns, JSON array, m2m against separate table?
  • What's the best way to make this performant
 
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 Mechanism for differentiating between "by me" and "liked by me" 691265198  

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