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This reverts commit 89b4612ffc97e6648f5cf807906ae210e05acdda.
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Only define attribute methods from schema cache
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To define the attribute methods for a model, Active Record needs to know
the schema of the underlying table, which is usually achieved by making
a request to the database. This is undesirable behaviour while the app
is booting, for two reasons: it makes the boot process dependent on the
availability of the database, and it means every new process will make
one query for each table, which can cause issues for large applications.
However, if the application is using the schema cache dump feature, then
the schema cache already contains the necessary information, and we can
define the attribute methods without causing any extra database queries.
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Restore an ability that class level `update` without giving ids
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That ability was introduced at #11898 as `Relation#update` without
giving ids, so the ability on the class level is not documented and not
tested.
c83e30d which fixes #33470 has lost two undocumented abilities.
One has fixed at 5c65688, but I missed the ability on the class level.
Removing any feature should not be suddenly happened in a stable version
even if that is not documented.
I've restored the ability and added test case to avoid any regression in
the future.
Fixes #34743.
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Since the `current_role` is public API.
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Since the `preventing_writes?` is public API.
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String properly
This reverts 27c6c07 since `arel_attr.to_s` is not right way to avoid
the type error.
That to_s returns `"#<struct Arel::Attributes::Attribute ...>"`, there
is no reason to match the regex to the inspect form.
And also, the regex path is not covered by our test cases. I've tweaked
the regex for redundant part and added assertions for the regex path.
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`connection.assume_migrated_upto_version`
Since #31727, `migrations_paths` in `assume_migrated_upto_version` is no
longer used.
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This was introduced at https://github.com/rails/rails/commit/cfa1df4b07bee5b2bbcbf9edd2ac287b4fb23c18#diff-b36b9c41be30b05dc14d09d7f3b192efR436.
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Rails 6 requires Ruby 2.5, which introduces `FrozenError`
https://docs.ruby-lang.org/en/2.5.0/NEWS.html
Related to #31520
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eileencodes/raise-less-confusing-error-if-handler-doesnt-exist
Raise helpful error when role doesn't exist
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If you try to call `connected_to` with a role that doesn't have an
established connection you used to get an error that said:
```
>> ActiveRecord::Base.connected_to(role: :i_dont_exist) { Home.first }
ActiveRecord::ConnectionNotEstablished Exception: No connection pool
with 'primary' found.
```
This is confusing because the connection could be established but we
spelled the role wrong.
I've changed this to raise if the `role` used in `connected_to` doesn't
have an associated handler. Users who encounter this should either check
that the role is spelled correctly (writin -> writing), establish a
connection to that role in the model with connects_to, or use the
`database` keyword for the `role`.
I think this will provide a less confusing error message for those
starting out with multiple databases.
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MySQL: `ROW_FORMAT=DYNAMIC` create table option by default
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Since MySQL 5.7.9, the `innodb_default_row_format` option defines the
default row format for InnoDB tables. The default setting is `DYNAMIC`.
The row format is required for indexing on `varchar(255)` with `utf8mb4`
columns.
As long as using MySQL 5.6, CI won't be passed even if MySQL server
setting is properly configured the same as MySQL 5.7
(`innodb_file_per_table = 1`, `innodb_file_format = 'Barracuda'`, and
`innodb_large_prefix = 1`) since InnoDB table is created as the row
format `COMPACT` by default on MySQL 5.6, therefore indexing on string
with `utf8mb4` columns aren't succeeded.
Making `ROW_FORMAT=DYNAMIC` create table option by default for legacy
MySQL version would mitigate the indexing issue on the user side, and it
makes CI would be passed on MySQL 5.6 which is configured properly.
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Currently we sometimes find a redundant begin block in code review
(e.g. https://github.com/rails/rails/pull/33604#discussion_r209784205).
I'd like to enable `Style/RedundantBegin` cop to avoid that, since
rescue/else/ensure are allowed inside do/end blocks in Ruby 2.5
(https://bugs.ruby-lang.org/issues/12906), so we'd probably meets with
that situation than before.
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https://bugs.ruby-lang.org/issues/14132
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since Ruby 2.5
https://bugs.ruby-lang.org/issues/14133
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Ref https://github.com/rails/rails/commit/59ff1ba30d9f4d34b4d478104cc3f453e553c67a#diff-38fb97fba84b1ef0f311c4110a597c44R35
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consistently
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This can be used to check the currently connected role. It's meant to
mirror AR::Base.connected_to
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BEGIN transaction would cause COMMIT or ROLLBACK, so unless COMMIT and
ROLLBACK aren't treated as write queries as well as BEGIN, the
`ReadOnlyError` would be raised.
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Otherwise `save` method would raise the `ReadOnlyError` against `BEGIN`
and `ROLLBACK` queries.
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Follow up #34505.
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Rename error that occurs when writing on a read
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I originally named this `StatementInvalid` because that's what we do in
GitHub, but `@tenderlove` pointed out that this means apps can't test
for or explitly rescue this error. `StatementInvalid` is pretty broad so
I've renamed this to `ReadOnlyError`.
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* `#create_or_find_by/!`: add more tests
* Fix docs of `create_or_find_by`
This method uses `find_by!` internally.
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`test_serialized_attribute_works_under_concurrent_initial_access` test
Since bd62389307e138ee0f274a9d62697567a3334ea0, isolate test of `test_serialized_attribute_works_under_concurrent_initial_access` fails.
```
$ ./bin/test -w test/cases/serialized_attribute_test.rb -n test_serialized_attribute_works_under_concurrent_initial_access
Using sqlite3
Run options: -n test_serialized_attribute_works_under_concurrent_initial_access --seed 32129
# Running:
E
Error:
SerializedAttributeTest#test_serialized_attribute_works_under_concurrent_initial_access:
ActiveRecord::StatementInvalid: SQLite3::SQLException: no such table:
```
If duplicate an unloaded model, it seems that method invocation for that class
is not guaranteed. Use the original class to avoid it.
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Fix attribute decoration leak on serialized attribute test
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Ensure that `delete_all` on collection proxy returns affected count
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Unlike the `Relation#delete_all`, `delete_all` on collection proxy
doesn't return affected count. Since the `CollectionProxy` is a subclass
of the `Relation`, this inconsistency is probably not intended, so it
should return the count consistently.
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Reset scope after delete on collection association to clear stale
offsets of removed records.
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See: https://travis-ci.org/rails/rails/jobs/462233144#L1384
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This PR adds the ability to prevent writes to a database even if the
database user is able to write (ie the database is a primary and not a
replica).
This is useful for a few reasons: 1) when converting your database from
a single db to a primary/replica setup - you can fix all the writes on
reads early on, 2) when we implement automatic database switching or
when an app is manually switching connections this feature can be used
to ensure reads are reading and writes are writing. We want to make sure
we raise if we ever try to write in read mode, regardless of database
type and 3) for local development if you don't want to set up multiple
databases but do want to support rw/ro queries.
This should be used in conjunction with `connected_to` in write mode.
For example:
```
ActiveRecord::Base.connected_to(role: :writing) do
Dog.connection.while_preventing_writes do
Dog.create! # will raise because we're preventing writes
end
end
ActiveRecord::Base.connected_to(role: :reading) do
Dog.connection.while_preventing_writes do
Dog.first # will not raise because we're not writing
end
end
```
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Fix the scoping with query methods in the scope block
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Follow up #33394.
#33394 only fixes the case of scoping with klass methods in the scope
block which invokes `klass.all`.
Query methods in the scope block also need to invoke `klass.all` to be
affected by the scoping.
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Allow aliased attributes to be used in `#update_columns` and `#update`.
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Fixes issue where "user post" is misinterpreted as "\"user\".\"post\""
when quoting table names with the postgres adapter.
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Use raw time string from DB to generate ActiveRecord#cache_version
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When an `updated_at` column exists on the model, but is not available on the instance (likely due to a select), we should raise an error rather than silently not generating a cache_version. Without this behavior it's likely that cache entries will not be able to be invalidated and this will happen without notice.
This behavior was reported and described by @lsylvester in https://github.com/rails/rails/pull/34197#issuecomment-429668759.
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Currently, the `updated_at` field is used to generate a `cache_version`. Some database adapters return this timestamp value as a string that must then be converted to a Time value. This process requires a lot of memory and even more CPU time. In the case where this value is only being used for a cache version, we can skip the Time conversion by using the string value directly.
- This PR preserves existing cache format by converting a UTC string from the database to `:usec` format.
- Some databases return an already converted Time object, in those instances, we can directly use `created_at`.
- The `updated_at_before_type_cast` can be a value that comes from either the database or the user. We only want to optimize the case where it is from the database.
- If the format of the cache version has been changed, we cannot apply this optimization, and it is skipped.
- If the format of the time in the database is not UTC, then we cannot use this optimization, and it is skipped.
Some databases (notably PostgreSQL) returns a variable length nanosecond value in the time string. If the value ends in a zero, then it is truncated For instance instead of `2018-10-12 05:00:00.000000` the value `2018-10-12 05:00:00` is returned. We detect this case and pad the remaining zeros to ensure consistent cache version generation.
Before: Total allocated: 743842 bytes (6626 objects)
After: Total allocated: 702955 bytes (6063 objects)
(743842 - 702955) / 743842.0 # => 5.4% ⚡️⚡️⚡️⚡️⚡️
Using the CodeTriage application and derailed benchmarks this PR shows between 9-11% (statistically significant) performance improvement versus the commit before it.
Special thanks to @lsylvester for helping to figure out a way to preserve the usec format and for helping with many implementation details.
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Additional types of ResultSet should not contain keys of #attributes_to_define_after_schema_loads
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