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- The mysql `NO_AUTO_VALUE_ON_ZERO` mode should be disabled when inserting fixtures in bulk, this PR adds a test to make sure we don't remove it by mistake
- If we live this mode enabled, a statement like this wouldn't work and a `Duplicate entry '0' for key 'PRIMARY'` error will be raised. That's because `DEFAULT` on auto_increment will return 0
```sql
INSERT INTO `aircraft` (`id`, `name`, `wheels_count`) VALUES (DEFAULT, 'first', 2), (DEFAULT, 'second', 3)
```
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Rails has some support for multiple databases but it can be hard to
handle migrations with those. The easiest way to implement multiple
databases is to contain migrations into their own folder ("db/migrate"
for the primary db and "db/seconddb_migrate" for the second db). Without
this you would need to write code that allowed you to switch connections
in migrations. I can tell you from experience that is not a fun way to
implement multiple databases.
This refactoring is a pre-requisite for implementing other features
related to parallel testing and improved handling for multiple
databases.
The refactoring here moves the class methods from the `Migrator` class
into it's own new class `MigrationContext`. The goal was to move the
`migrations_paths` method off of the `Migrator` class and onto the
connection. This allows users to do the following in their
`database.yml`:
```
development:
adapter: mysql2
username: root
password:
development_seconddb:
adapter: mysql2
username: root
password:
migrations_paths: "db/second_db_migrate"
```
Migrations for the `seconddb` can now be store in the
`db/second_db_migrate` directory. Migrations for the primary database
are stored in `db/migrate`".
The refactoring here drastically reduces the internal API for migrations
since we don't need to pass `migrations_paths` around to every single
method. Additionally this change does not require any Rails applications
to make changes unless they want to use the new public API. All of the
class methods from the `Migrator` class were `nodoc`'d except for the
`migrations_paths` and `migrations_path` getter/setters respectively.
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Currently `object.save` will unfreeze the object, due to
`changes_applied` replaces frozen `@attributes` to new `@attributes`.
Since originally destroyed objects are not allowed to be mutated, `save`
and `save!` should not return success in that case.
Fixes #28563.
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If `collation` is given without `charset`, it may generate invalid SQL.
For example `create_database(:matt_aimonetti, collation: "utf8mb4_bin")`:
```
> CREATE DATABASE `matt_aimonetti` DEFAULT CHARACTER SET `utf8` COLLATE `utf8mb4_bin`;
ERROR 1253 (42000): COLLATION 'utf8mb4_bin' is not valid for CHARACTER SET 'utf8'
```
In MySQL, charset is used to find the default collation. If `collation`
is given explicitly, it is not necessary to give extra charset.
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Allow unscoping of left_outer_joins
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When deleting through records, take into account association conditions
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Fixes #18424.
When deleting through records, it didn't take into account the
conditions that may have been affecting join model table, but was
defined in association definition.
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`relation.exists?` just wants to know if there is a result or not, does
not need the exact records matched. Therefore, an intermediate SELECT
query for eager loading is not necessary.
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Need reloading when through record has replaced.
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zoltankiss/allow-nested-has-many-associations-on-unpersisted-parent-instances
fix nested `has many :through` associations on unpersisted parent instances
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Fixes: #16313
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Currently deleting through records doesn't respect `source_type`. It
should not be ignored in that case.
Related #23209.
Fixes #24116.
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Currently `last` with `offset` behaves incorrectly because `offset` can
not be reversed like `limit`. Therefore, `offset` should also be handled
like `limit`.
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Commit 4ec5b0d was for fixing the regression #18787, but #28379 fixes
#18787 as well. So 4ec5b0d is no longer necessary.
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This is a partial revert of #26182. There is no reason to change the
default value.
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Currently reflections keeps the order when first added even if when
redefining association. As a result of the order, redefining through
association which use newly added association will raise
`HasManyThroughOrderError`. We need to redefine reflection order as well
when redefining association.
Fixes #31068.
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This method which is used only in the internal was introduced in
ac384820 and was renamed in #17579. It does not need to be exposed.
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An empty string is an invalid value in Ruby's range class.
So need to handle `Float::INFINITY` as it is and cast it in
`encode_range`.
Fixes #31612
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Add bulk alter support for PostgreSQL
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Remove dormant check
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Use `count(:all)` in HasManyAssociation#count_records
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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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fix the dirty tracking code's save hook overwriting missing attribute…
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initialized-to-nil attributes. fixes #29017.
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This is a regression test for #27864.
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`ThroughReflection`
This method was introduced in #26718, which is internally used only in
`CollectionAssociation`. There is no need to be in the reflection
classes.
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Bugfix foreign key replacement in inverse association
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when model is added to collection association
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We can't replace existing SELECT list as long as having DISTINCT, it
will cause incorrect result.
And also, PostgreSQL has a limitation that ORDER BY expressions must
appear in select list for SELECT DISTINCT.
Therefore, we should not replace existing SELECT list when using
DISTINCT.
Fixes #29779.
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We can't replace existing select list as long as referenced by ORDER BY.
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Originally I tried to add `assert_equal pk.sql_type, ref.sql_type`. But
the assert failed even though the same type due to `sql_type` of primary
key in SQLite is upper case. Prefer lower case like other types.
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And prefer `assert_same` over `assert_equal`.
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mikelikesbikes/fix-update-attribute-callbacks-issue
save attributes changed by callbacks after update_attribute
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update_attribute previously stopped execution, before saving and before
running callbacks, if the record's attributes hadn't changed. [The
documentation](http://api.rubyonrails.org/classes/ActiveRecord/Persistence.html#method-i-update_attribute)
says that "Callbacks are invoked", which was not happening if the
persisted attributes hadn't changed.
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Context: https://github.com/rails/rails/pull/29301#issuecomment-353200233
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Handle `FrozenError` if it is available
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This pull request handles `FrozenError` introduced by Ruby 2.5.
Refer https://bugs.ruby-lang.org/projects/ruby-trunk/repository/revisions/61131
Since `FrozenError` is a subclass of `RuntimeError` minitest used by master
branch can handle it, though it would be better to handle `FrozenError`
explicitly if possible.
`FrozenError` does not exist in Ruby 2.4 or lower, `frozen_error_class`
handles which exception is expected to be raised.
This pull request is intended to be merged to master,
then backported to `5-1-stable` to address #31508
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Follow up of #31177.
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albertoalmagro/remove-default-mysql-engine-from-ar-5-2
Remove default ENGINE=InnoDB for Mysql2 adapter
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Before this commit ENGINE=InnoDB was added by default to Mysql2 adapter
+create_table+ if no +options+ option was provided. This default ENGINE
was lost as soon as something was passed in at +options+ option, making
its goal and propagation inconsistent, as the programmer needed to
remember including ENGINE=InnoDB when something was passed in.
This commit removes default ENGINE as its use isn't needed anymore for
current MySQL and MariaDB versions. It adds compatibility support and
tests to ensure that default ENGINE is still present for migrations
with version 5.1 and before. It also ensures we still dump the ENGINE
option to +schema.rb+ in order to avoid inconsistencies.
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Currently `count(:all)` with `distinct` doesn't work correctly because
SELECT list is always replaced to `*` or primary key in that case even
if having custom SELECT list.
And also, PostgreSQL has a limitation that ORDER BY expressions must
appear in select list for SELECT DISTINCT.
Therefore, we should not replace custom SELECT list when using
`count(:all)` with `distinct`.
Closes #31277.
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assert_nothing_raised not required here, we can assert directly for the actual result
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