Use count(:all) in HasManyAssociation#count_records
#27561
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rafaelfranca
requested changes
Jan 4, 2017
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Sure thing, I'll give it a whirl. 👍 |
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Other things are craving for my attention right now. For some reason, I am unable to replicate the problem in a test case. From what I've understood, the issue appears when you call The stack looks like this: |
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What I have so far in terms of test is author = Author.create!(name: "A")
5.times { author.posts << Post.create!(title: "a", body: "b") }
same_authors_posts = Author.find(author.id).posts
assert_equal 5, same_authors_posts.sizeThe issue is that this works, and I'm not really sure what to do in order to actually end up in the same place as I do when the issue appears. Do you have any suggestions on how to proceed? |
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I'm afraid I don't have any good suggestion how to proceed other than try to isolate the code in your application that trigger the bug and replicate in a Rails test case. Maybe there is a |
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@rafaelfranca Yes, there was a There is now a test case here too. Thoughts? (Sorry for squashing the commits before pushing.) |
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@rafaelfranca Sorry to bother you again. Any chance you'll get to take a look at this anytime soon? |
Problem: Calling `count` on an association can cause invalid SQL queries to be created where the `SELECT COUNT(a, b, c)` function receives multiple columns. This will cause a `StatementInvalid` exception later on. Solution: Use `count(:all)`, which generates a `SELECT COUNT(*)...` query independently of the association. This also includes a test case that, before the fix, broke.
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Hey @rafaelfranca, I rebased on top of |
kamipo
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Jan 2, 2018
…ation Use `count(:all)` in HasManyAssociation#count_records
kamipo
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Jan 3, 2018
…ation Use `count(:all)` in HasManyAssociation#count_records
bogdanvlviv
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Mar 18, 2018
- Remove
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The custom reporters are added only if needed.
This will fix conflicts with others plugins.
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* Add support for compatibility with redis-rb gem for 4.0 version.
([Pull Request](rails#30748))
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since it was backported to
`5-1-stable` by 3789531.
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* Add `action_controller_api` and `action_controller_base` load hooks to be
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([Pull Request](rails#28402))
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* `driven_by` now registers poltergeist and capybara-webkit.
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for bad input.
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`collection_radio_buttons`.
([Pull Request](rails#29412))
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* Fix issues with scopes and engine on `current_page?` method.
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* Add type caster to `RuntimeReflection#alias_name`.
([Pull Request](rails#28961))
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since it was backported to
`5-1-stable` by f644e7a.
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* Loading model schema from database is now thread-safe.
([Pull Request](rails#29216))
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since it was backported to
`5-1-stable` by 02926cf.
and
`5-0-stable` by 84bcfe5
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```
* Fix destroying existing object does not work well when optimistic locking
enabled and `locking_column` is null in the database.
([Pull Request](rails#28926))
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since it was backported to
`5-1-stable` by e498052.
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```
* `ActiveRecord::Persistence#touch` does not work well
when optimistic locking enabled and `locking_column`,
without default value, is null in the database.
([Pull Request](rails#28914))
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since it was backported to
`5-1-stable` by 1e2f63d.
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```
* Previously, when building records using a `has_many :through` association,
if the child records were deleted before the parent was saved,
they would still be persisted. Now, if child records are deleted
before the parent is saved on a `has_many :through` association,
the child records will not be persisted.
([Pull Request](rails#29593))
```
since it was backported to
`5-1-stable` by a22c39e.
- Remove
```
* Query cache was unavailable when entering the `ActiveRecord::Base.cache`
block without being connected.
([Pull Request](rails#29609))
```
since it was backported to
`5-1-stable` by fd6c8cd
and
`5-0-stable` by 9f2532b.
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```
* `Relation#joins` is no longer affected by the target model's
`current_scope`, with the exception of `unscoped`.
([Commit](rails@5c71000))
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since it was backported to
`5-1-stable` by 3630d63.
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* Fix `unscoped(where: [columns])` removing the wrong bind values.
([Pull Request](rails#29780))
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since it was backported to
`5-1-stable` by d378fcb.
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* When a `has_one` association is destroyed by `dependent: destroy`,
`destroyed_by_association` will now be set to the reflection, matching the
behaviour of `has_many` associations.
([Pull Request](rails#29855))
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since it was backported to
`5-1-stable` by 8254a8b.
- Remove
```
* Fix `COUNT(DISTINCT ...)` with `ORDER BY` and `LIMIT`
to keep the existing select list.
([Pull Request](rails#29848))
```
since it was backported to
`5-1-stable` by 0e8d4ed.
- Remove
```
* Ensure `sum` honors `distinct` on `has_many :through` associations.
([Commit](rails@566f1fd))
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since it was backported to
`5-1-stable` by c0a1dc2.
- Remove
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* Fix `COUNT(DISTINCT ...)` for `GROUP BY` with `ORDER BY` and `LIMIT`.
([Commit](rails@5668dc6))
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since it was backported to
`5-1-stable` by 87ca68e.
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* MySQL: Don't lose `auto_increment: true` in the `db/schema.rb`.
([Commit](rails@9493d45))
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since it was backported to
`5-1-stable` by 8b6e694.
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* Fix longer sequence name detection for serial columns.
([Pull Request](rails#28339))
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since it was backported to
`5-1-stable` by af9c170
and
`5-0-stable` by 7025b1d.
- Remove
```
* Fix `bin/rails db:setup` and `bin/rails db:test:prepare` create wrong
ar_internal_metadata's data for a test database.
([Pull Request](rails#30579))
```
since it was backported to
`5-1-stable` by bb67b5f
and
`5-0-stable` by 60437e6.
- Remove
```
* Fix conflicts `counter_cache` with `touch: true` by optimistic locking.
([Pull Request](rails#31405))
```
since it was backported to
`5-1-stable` by 5236dda.
- Remove
```
* Fix `count(:all)` to correctly work `distinct` with custom SELECT list.
([Commit](rails@c6cd9a5))
```
since it was backported to
`5-1-stable` by 6beb4de.
- Remove
```
* Fix to invoke callbacks when using `update_attribute`.
([Commit](rails@732aa34))
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since it was backported to
`5-1-stable` by 6346683.
- Remove
```
* Use `count(:all)` in `HasManyAssociation#count_records` to prevent invalid
SQL queries for association counting.
([Pull Request](rails#27561))
```
since it was backported to
`5-1-stable` by eef3c89.
- Remove
```
* Fix `count(:all)` with eager loading and having an order other than
the driving table.
([Commit](rails@ebc09ed))
```
since it was backported to
`5-1-stable` by 6df9b69.
- Remove
```
* PostgreSQL: Allow pg-1.0 gem to be used with Active Record.
([Pull Request](rails#31671))
```
since it was backported to
`5-1-stable` by a9c06f6.
- Remove
```
* Fix that after commit callbacks on update does not triggered
when optimistic locking is enabled.
([Commit](rails@7f9bd03))
```
since it was backported to
`5-1-stable` by aaee10e.
- Remove
```
* Fix regression in numericality validator when comparing Decimal and Float
input values with more scale than the schema.
([Pull Request](rails#28584))
```
since it was backported to
`5-1-stable` by 5b1c3e5.
Note that there was incorrect link to PR,
original PR is rails#29249.
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* Fix to working before/after validation callbacks on multiple contexts.
([Pull Request](rails#31483))
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since it was backported to
`5-1-stable` by 0f7046a.
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```
* Fix implicit coercion calculations with scalars and durations.
([Pull Request](rails#29163),
[Pull Request](rails#29971))
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since it was backported to
`5-1-stable` by 51ea27c,
4d82e2a.
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* Fix modulo operations involving durations.
([Commit](rails@a54e13b))
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* Return all mappings for a timezone identifier in `country_zones`.
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since it was backported to
`5-1-stable` by 0222ebb.
- Remove
```
* Add support for compatibility with redis-rb gem for 4.0 version.
([Pull Request](rails#30748))
```
since it was backported to
`5-1-stable` by 3789531.
Related to rails#32252.
Related to rails#32222, rails#32222 (comment).
Follow up a489cc8.
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Problem: Calling
counton an association can cause invalid SQL queries to be created where theSELECT COUNT(a, b, c)function receives multiple columns. This will cause aStatementInvalidexception later on.Solution: Use
count(:all), which generates aSELECT COUNT(*)...query independently of the association.Background: This appears to be previously an known problem, see #15138 and #13648.
Hit me with your feedback! 👍