Fix follow IDs #455

I changed the syntax of the insert! macro, allowing to modify an object just after it was saved to the database. You can now optional pass it a "closure" (actually it just looks like a closure) that will be run just after the insertion.

I updated all the models, including Follow, to use it to generate AP ID and URL. The advantages are that the ID/URL are now correct (fixes #449) and that we don't have methods like update_boxes or update_ap_url to call manually and that were easy to forget.

I changed the syntax of the `insert!` macro, allowing to modify an object just after it was saved to the database. You can now optional pass it a "closure" (actually it just looks like a closure) that will be run just after the insertion. I updated all the models, including Follow, to use it to generate AP ID and URL. The advantages are that the ID/URL are now correct (fixes #449) and that we don't have methods like `update_boxes` or `update_ap_url` to call manually and that were easy to forget.

Codecov Report

Merging #455 into master will increase coverage by 1.41%.
The diff coverage is 79.31%.

@@            Coverage Diff             @@
##           master     #455      +/-   ##
==========================================
+ Coverage   25.06%   26.48%   +1.41%     
==========================================
  Files          64       64              
  Lines        6316     7111     +795     
==========================================
+ Hits         1583     1883     +300     
- Misses       4733     5228     +495

# [Codecov](https://codecov.io/gh/Plume-org/Plume/pull/455?src=pr&el=h1) Report > Merging [#455](https://codecov.io/gh/Plume-org/Plume/pull/455?src=pr&el=desc) into [master](https://codecov.io/gh/Plume-org/Plume/commit/a2b9d7ec44daf91d5b0dde00715d7185b5342c94?src=pr&el=desc) will **increase** coverage by `1.41%`. > The diff coverage is `79.31%`. ```diff @@ Coverage Diff @@ ## master #455 +/- ## ========================================== + Coverage 25.06% 26.48% +1.41% ========================================== Files 64 64 Lines 6316 7111 +795 ========================================== + Hits 1583 1883 +300 - Misses 4733 5228 +495 ```

LGTM

 @ -228,4 +228,3 @@
             post.cover_id = form.cover;
             post.update(&*conn, &searcher).expect("post::update: update error");;
             let post = post.update_ap_url(&*conn).expect("post::update: update ap url error");

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Fix follow IDs #455

Codecov Report

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