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abhaynikam/fix-typo-in-active-record-multiple-database-guides
Fix typo initialzer -> initializer
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Delete method definition in rails that is compatible with ruby defini…
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definition
Tests are also only on the `Time` class
Update doc forgetting to erase when moved
Update guide `Date` class to `Time` class and defined file
Update guide correction omission
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`content_types_to_serve_as_binary` [ci skip]
Ref: bcf370d689673031073ba2ac5588afe41cc315c9, 06ab7b27ea1c1ab357085439abacdb464f6742bf.
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Remove unused `Arel::Attributes.for`
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`Arel::Attributes.for` is no longer used since https://github.com/rails/arel/pull/196.
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soartec-lab/fix/guide_delete_description_for_date_and_time
Delete 'ruby' in the description of the method defined in rails [skip ci]
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No allocation `Arel::Visitors::ToSql#visit`
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Each `visit o, collector` allocates one extra array due to
receiving args by splat array.
https://github.com/rails/rails/blob/2c3332cc4c0fa77dbe2e13e8a792f80fbd8f4ad3/activerecord/lib/arel/visitors/visitor.rb#L27-L29
Currently 1,000 times `User.where(id: 1).to_sql` allocates 13,000
arrays in `visitor.accept`. This avoids receiving args by splat array,
it makes `visitor.accept` no array allocation.
```ruby
ObjectSpace::AllocationTracer.setup(%i{path line type})
pp ObjectSpace::AllocationTracer.trace {
1_000.times { User.where(id: 1).to_sql }
}.select { |k, _| k[2] == :T_ARRAY && k[0].end_with?("visitor.rb", "to_sql.rb") }
```
Before (2c3332cc4c0fa77dbe2e13e8a792f80fbd8f4ad3):
```
{["~/rails/activerecord/lib/arel/visitors/to_sql.rb",
18,
:T_ARRAY]=>[1000, 0, 0, 0, 0, 0],
["~/rails/activerecord/lib/active_record/connection_adapters/determine_if_preparable_visitor.rb",
11,
:T_ARRAY]=>[1000, 0, 0, 0, 0, 0],
["~/rails/activerecord/lib/arel/visitors/visitor.rb",
12,
:T_ARRAY]=>[1000, 0, 0, 0, 0, 0],
["~/rails/activerecord/lib/arel/visitors/to_sql.rb",
788,
:T_ARRAY]=>[3000, 0, 0, 0, 0, 0],
["~/rails/activerecord/lib/arel/visitors/to_sql.rb",
794,
:T_ARRAY]=>[3000, 0, 0, 0, 0, 0],
["~/rails/activerecord/lib/arel/visitors/to_sql.rb",
156,
:T_ARRAY]=>[1000, 0, 0, 0, 0, 0],
["~/rails/activerecord/lib/arel/visitors/to_sql.rb",
443,
:T_ARRAY]=>[1000, 0, 0, 0, 0, 0],
["~/rails/activerecord/lib/arel/visitors/to_sql.rb",
603,
:T_ARRAY]=>[1000, 0, 0, 0, 0, 0],
["~/rails/activerecord/lib/arel/visitors/to_sql.rb",
611,
:T_ARRAY]=>[1000, 0, 0, 0, 0, 0]}
```
After (this change):
```
{}
```
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Tables in tests are not always empty so `klass.first` does not always
find last created record.
Fixes #36479.
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https://buildkite.com/rails/rails/builds/61744#f12cc6cf-7458-4131-917a-9735615f6259/999-1010
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eileencodes/move-while_preventing_writes-to-handler
Move while_preventing_writes from conn to handler
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If we put the `while_preventing_writes` on the connection then the
middleware that sends reads to the primary and ensures they can't write
will not work. The `while_preventing_writes` will only be applied to the
connection which it's called on - which in the case of the middleware is
Ar::Base.
This worked fine if you called it directly like
`OtherDbConn.connection.while_preventing_writes` but Rails didn't have a
way of knowing you wanted to call it on all the connections.
The change here moves the `while_preventing_writes` method from the
connection to the handler so that it can block writes to all queries for
that handler. This will apply to all the connections associated with
that handler.
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Update multi-db docs
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* Add note about schema cache
* Add note about opening too many connections
* Improve headers in caveats section
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eileencodes/move-schema-migration-to-migration-context
Move SchemaMigration to migration_context
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This PR moves the `schema_migration` to `migration_context` so that we
can access the `schema_migration` per connection.
This does not change behavior of the SchemaMigration if you are using
one database. This also does not change behavior of any public APIs.
`Migrator` is private as is `MigrationContext` so we can change these as
needed.
We now need to pass a `schema_migration` to `Migrator` so that we can
run migrations on the right connection outside the context of a rake
task.
The bugs this fixes were discovered while debugging the issues around
the SchemaCache on initialization with multiple database. It was clear
that `get_all_versions` wouldn't work without these changes outside the
context of a rake task (because in the rake task we establish a
connection and change AR::Base.connection to the db we're running on).
Because the `SchemaCache` relies on the `SchemaMigration` information we
need to make sure we store it per-connection rather than on
ActiveRecord::Base.
[Eileen M. Uchitelle & Aaron Patterson]
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albertoalmagro/alberto/reverse-column-is-reversible
[ci skip] Update docs as `remove_column` can be reversed
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As `remove_column` can be reversed when a type is provided this example
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Allocation on demand in transactions
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Currently 1,000 transactions creates 10,000 objects regardless whether
it is necessary or not.
This makes allocation on demand in transactions, now 1,000 transactions
creates required 5,000 objects only by default.
```ruby
ObjectSpace::AllocationTracer.setup(%i{path line type})
pp ObjectSpace::AllocationTracer.trace {
1_000.times { User.create }
}.select { |k, _| k[0].end_with?("transaction.rb") }
```
Before (95d038f):
```
{["~/rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb",
209,
:T_HASH]=>[1000, 0, 715, 0, 1, 0],
["~/rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb",
210,
:T_OBJECT]=>[1000, 0, 715, 0, 1, 0],
["~/rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb",
210,
:T_HASH]=>[1000, 0, 715, 0, 1, 0],
["~/rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb",
80,
:T_OBJECT]=>[1000, 0, 715, 0, 1, 0],
["~/rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb",
8,
:T_ARRAY]=>[1000, 0, 715, 0, 1, 0],
["~/rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb",
81,
:T_ARRAY]=>[1000, 0, 715, 0, 1, 0],
["~/rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb",
289,
:T_STRING]=>[1000, 0, 714, 0, 1, 0],
["~/rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb",
116,
:T_ARRAY]=>[1000, 0, 714, 0, 1, 0],
["~/rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb",
120,
:T_ARRAY]=>[1000, 0, 714, 0, 1, 0],
["~/rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb",
121,
:T_HASH]=>[1000, 0, 714, 0, 1, 0]}
```
After (this change):
```
{["~/rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb",
213,
:T_HASH]=>[1000, 0, 739, 0, 1, 0],
["~/rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb",
214,
:T_OBJECT]=>[1000, 0, 739, 0, 1, 0],
["~/rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb",
214,
:T_HASH]=>[1000, 0, 739, 0, 1, 0],
["~/rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb",
81,
:T_OBJECT]=>[1000, 0, 739, 0, 1, 0],
["~/rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb",
304,
:T_STRING]=>[1000, 0, 738, 0, 1, 0]}
```
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[ci skip] Use default path in button_to documentation
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This is really a nit pick, but as this is the framework's documentation
I think it should follow standards as many times as possible to avoid
confusion in new users.
If we were using `resources :articles` in routes. which is what scaffold
adds, the generated helper would be `new_article_path` instead of
`new_articles_path`.
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Fix programmatic clicks with data-remote
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* Make ActiveRecord `ConnectionPool.connections` thread-safe.
ConnectionPool documentation is clear on the need to synchronize
access to @connections but also states that public methods do not
require synchronization. Existing code exposed @connections
directly via attr_reader. The fix uses synchronize() to lock
@connections then returns a copy to the caller using Array.dup().
Includes comments on the connections method that thread-safe access
to the connections array does not imply thread-safety of accessing
methods on the actual connections.
Adds a test-case that modifies the pool using a supported method
in one thread while a second thread accesses pool.connections.
The test fails without this patch.
Fixes #36465.
* Update activerecord/test/cases/connection_pool_test.rb
[jeffdoering + Rafael Mendonça França]
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images/getting_started: Update screenshot for missing action
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Introduce ActionView::Component
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Co-authored-by: Natasha Umer <natashau@github.com>
Co-authored-by: Aaron Patterson <tenderlove@github.com>
Co-authored-by: Shawn Allen <shawnbot@github.com>
Co-authored-by: Emily Plummer <emplums@github.com>
Co-authored-by: Diana Mounter <broccolini@github.com>
Co-authored-by: John Hawthorn <jhawthorn@github.com>
Co-authored-by: Nathan Herald <myobie@github.com>
Co-authored-by: Zaid Zawaideh <zawaideh@github.com>
Co-authored-by: Zach Ahn <engineering@zachahn.com>
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merge master
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"schema_migrations" table may be hard dropped before, so the reset
migration version should be done in ensure block.
https://buildkite.com/rails/rails/builds/61697#18d6f3ac-2257-4f4b-8efc-4010464c4d9a/999-1011
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https://buildkite.com/rails/rails/builds/61695#373bb1a7-677f-49ec-95e7-a92467fefd60/1076-1084
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"schema_migrations" is hard dropped by some existing tests, so testing
migration in using transactional tests may cause implicit creation and
rollback "schema_migrations" table, it makes migration tests flaky.
https://buildkite.com/rails/rails/builds/61692#42383249-30be-4508-b1fb-a7bb27600c8e/999-1010
https://buildkite.com/rails/rails/builds/61694#6e462ad3-41d8-4e26-95ce-728495b0ac64/999-1010
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Enable `Layout/EmptyLinesAroundAccessModifier` cop
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We sometimes say "✂️ newline after `private`" in a code review (e.g.
https://github.com/rails/rails/pull/18546#discussion_r23188776,
https://github.com/rails/rails/pull/34832#discussion_r244847195).
Now `Layout/EmptyLinesAroundAccessModifier` cop have new enforced style
`EnforcedStyle: only_before` (https://github.com/rubocop-hq/rubocop/pull/7059).
That cop and enforced style will reduce the our code review cost.
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`table_exists?` is already exist in `ModelSchema`.
https://github.com/rails/rails/blob/5cab344494c340ea82a35b46efa06b94f0b7730b/activerecord/lib/active_record/model_schema.rb#L339-L341
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Since 5cab34449, `drop_table` clears schema cache.
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Otherwise `Model.table_exists?` returns the staled cache result.
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Add missing file to require digest/uuid on active_support core ext
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ActionCable: optimise logger.debug calling
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Add support for multiple databases to `rails db:abort_if_pending_migrations`
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