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[ci skip] Improve remove_column documentation
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Since when we remove one column it will also remove the associated
indexes, we must ensure this behaviour is properly documented.
In this commit we add a line to the documentation mentioning this
behaviour.
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`DatabaseLimits` and those methods were introduced at 3809c80, but most
methods were never used and never tested from the beginning (except
`table_alias_length`, `index_name_length`, and `in_clause_length` (since
66c09372)).
There is no reason to maintain unused those methods for about 8 years.
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This method used to take a block, but that's no longer the case so we
can delete the block from the method signature.
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tgxworld/regression_setting_children_record_in_parent_before_save
Fix regression setting children record in parent before_save callback.
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`_create_record` is passed `attribute_names` only.
```
% git grep -n '_create_record(attribute_names'
lib/active_record/attribute_methods/dirty.rb:173: def _create_record(attribute_names = attribute_names_for_partial_writes)
lib/active_record/counter_cache.rb:162: def _create_record(attribute_names = self.attribute_names)
lib/active_record/locking/optimistic.rb:64: def _create_record(attribute_names = self.attribute_names)
lib/active_record/persistence.rb:738: def _create_record(attribute_names = self.attribute_names)
```
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Part 3: Multi-db Improvements, identifying replica configurations
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Changes the `configs_for` method from using traditional arguments to
using kwargs. This is so I can add the `include_replicas` kwarg without
having to always include `env_name` and `spec_name` in the method call.
`include_replicas` defaults to false because everywhere internally in
Rails we don't want replicas. `configs_for` is for iterating over
configurations to create / run rake tasks, so we really don't ever need
replicas in that case.
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Checks if the config has a "replica" key, if so the configuration is for
a replica database. This is useful for excluding replicas from the
configurations list when creating the rake tasks or running rake tasks.
For example, we don't want to create the primary and primary_readonly.
They're the same database.
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This allows the user to add `replica: true` to the database config to
signify the connection should be treated as readonly. This will be
useful so we can ignore structure dumps or migrations (or creating /
deleting etc) the readonly connection for the databases. These are
paired with a write database which is where the create/drop/migrate
should be run. This allows us to ask the connection if it's for a
replica readonly db or a primary write db.
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This restores an ability that `update` with ids on a relation which is
described at https://github.com/rails/rails/issues/33470#issuecomment-411203013.
I personally think that the `update` with two arguments on a relation is
not a designed feature, since that is totally not using a relation
state, and also is not documented.
But removing any feature should not be suddenly happened in a stable
version even if that is not documented.
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Refactor Active Record configurations
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While the three-tier config makes it easier to define databases for
multiple database applications, it quickly became clear to offer full
support for multiple databases we need to change the way the connections
hash was handled.
A three-tier config means that when Rails needed to choose a default
configuration (in the case a user doesn't ask for a specific
configuration) it wasn't clear to Rails which the default was. I
[bandaid fixed this so the rake tasks could work](#32271) but that fix
wasn't correct because it actually doubled up the configuration hashes.
Instead of attemping to manipulate the hashes @tenderlove and I decided
that it made more sense if we converted the hashes to objects so we can
easily ask those object questions. In a three tier config like this:
```
development:
primary:
database: "my_primary_db"
animals:
database; "my_animals_db"
```
We end up with an object like this:
```
@configurations=[
#<ActiveRecord::DatabaseConfigurations::HashConfig:0x00007fd1acbded10
@env_name="development",@spec_name="primary",
@config={"adapter"=>"sqlite3", "database"=>"db/development.sqlite3"}>,
#<ActiveRecord::DatabaseConfigurations::HashConfig:0x00007fd1acbdea90
@env_name="development",@spec_name="animals",
@config={"adapter"=>"sqlite3", "database"=>"db/development.sqlite3"}>
]>
```
The configurations setter takes the database configuration set by your
application and turns them into an
`ActiveRecord::DatabaseConfigurations` object that has one getter -
`@configurations` which is an array of all the database objects.
The configurations getter returns this object by default since it acts
like a hash in most of the cases we need. For example if you need to
access the default `development` database we can simply request it as we
did before:
```
ActiveRecord::Base.configurations["development"]
```
This will return primary development database configuration hash:
```
{ "database" => "my_primary_db" }
```
Internally all of Active Record has been converted to use the new
objects. I've built this to be backwards compatible but allow for
accessing the hash if needed for a deprecation period. To get the
original hash instead of the object you can either add `to_h` on the
configurations call or pass `legacy: true` to `configurations.
```
ActiveRecord::Base.configurations.to_h
=> { "development => { "database" => "my_primary_db" } }
ActiveRecord::Base.configurations(legacy: true)
=> { "development => { "database" => "my_primary_db" } }
```
The new configurations object allows us to iterate over the Active
Record configurations without losing the known environment or
specification name for that configuration. You can also select all the
configs for an env or env and spec. With this we can always ask
any object what environment it belongs to:
```
db_configs = ActiveRecord::Base.configurations.configurations_for("development")
=> #<ActiveRecord::DatabaseConfigurations:0x00007fd1acbdf800
@configurations=[
#<ActiveRecord::DatabaseConfigurations::HashConfig:0x00007fd1acbded10
@env_name="development",@spec_name="primary",
@config={"adapter"=>"sqlite3", "database"=>"db/development.sqlite3"}>,
#<ActiveRecord::DatabaseConfigurations::HashConfig:0x00007fd1acbdea90
@env_name="development",@spec_name="animals",
@config={"adapter"=>"sqlite3", "database"=>"db/development.sqlite3"}>
]>
db_config.env_name
=> "development"
db_config.spec_name
=> "primary"
db_config.config
=> { "adapter"=>"sqlite3", "database"=>"db/development.sqlite3" }
```
The configurations object is more flexible than the configurations hash
and will allow us to build on top of the connection management in order
to add support for primary/replica connections, sharding, and
constructing queries for associations that live in multiple databases.
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Do not recompute length
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We can get a speed gain by moving the length calculation and assignment out of the loop.
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eileencodes/add-migrations_paths_option-to-migration-generator
Add migrations_paths option to migration generator
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Adds an option to the migration generator to allow setting the
migrations paths for that migration. This is useful for applications
that use multiple databases and put migrations per database in their own
directories.
```
bin/rails g migration CreateHouses address:string --migrations-paths=db/kingston_migrate
invoke active_record
create db/kingston_migrate/20180830151055_create_houses.rb
```
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Use `delete_if` instead of `reject` to avoid an extra allocation.
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`attributes_with_values_for_update` is no longer used since ae2d36c, and
`attributes_with_values_for_create` is internally used only one place.
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It should be done only once in `Persistence` module.
https://github.com/rails/rails/blob/c83e30da27eafde79164ecb376e8a28ccc8d841f/activerecord/lib/active_record/persistence.rb#L721
https://github.com/rails/rails/blob/c83e30da27eafde79164ecb376e8a28ccc8d841f/activerecord/lib/active_record/persistence.rb#L740
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Find inverse associations with plural names
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Previously ActiveRecord couldn't find inverse associations if they were plural, which is a pretty standard use case. This commit changes the behavior to first attempt to find the singular version, then attempt to find the plural version. That makes it work and find plural associations as in the example below:
```
class Post
has_many :comments
end
class Comment
belongs_to :post
end
```
Previously the `:post` association reflection would only attempt to find a `comment` inverse, as opposed to both a `comment` and `comments` inverse.
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Prevent leaking of user's DB credentials on `rails db:create` failure
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Issue #27852 reports that when `rails db:create` fails, it causes
leaking of user's DB credentials to $stderr.
We print a DB's configuration hash in order to help users more quickly
to figure out what could be wrong with his configuration.
This commit changes message from
"Couldn't create database for #{configuration.inspect}" to
"Couldn't create '#{configuration['database']}' database. Please check your configuration.".
There are two PRs that fixing it #27878, #27879, but they need a bit more work.
I decided help to finish this and added Author of those PRs credit in this commit.
Since it is a security issue, I think we should backport it to
`5-2-stable`, and `5-1-stable`.
Guided by https://edgeguides.rubyonrails.org/maintenance_policy.html#security-issues
Fixes #27852
Closes #27879
Related to #27878
[Alexander Marrs & bogdanvlviv]
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Drop load_database_yaml and fix test
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We originally did the whole `load_database_yaml` thing because this test
wasn't cooperating and we needed to finish the namespaced rake tasks for
multiple databases.
However, it turns out that YAML can't eval ERB if you don't tell it it's
ERB so you get Pysch parse errors if you're using multi-line ERB or
ERB with conditionals. It's a hot mess.
After trying a few things and thinking it over we decided that it wasn't
worth bandaiding over, the test needed to be improved. The test was
added in #31135 to test that the env is loaded in these tasks. But it
was blowing up because we were trying to read a database name out of the
configuration - however that's not the purpose of this change. We want
to read environment files in the rake tasks, but not in the config
file.
In this PR we changed the test to test what the PR was actually fixing.
We've also deleted the `load_database_yaml` because it caused more
problems than it was worth. This should fix the issues described in
https://github.com/rails/rails/pull/32274#issuecomment-384161057. We
also had these problems at GitHub.
Co-authored-by: alimi <aibrahim2k2@gmail.com>
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Finish converting whitelist and blacklist references
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`changes_applied` should be called before continuing around callback
chain. Otherwise the mutation tracker returns old value for methods like
`changed`? or `id_in_database` in around callbacks. Also methods depend
on `id_in_database`, like `update_column`, are not working in
`around_create` callbacks.
```
class Foo < ActiveRecord::Base
around_create :around_create_callback
def around_create_callback
...
yield
p id_in_database # => nil
update_column(:generated_column, generate_value) # silently fails
end
...
end
```
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* Add documentation for `:collation` option
The table definition supports a `:collation` option for string and text columns, but this is not documented anywhere that I could find.
I'm not sure if the "If not specified" part is accurate. From [this PR](https://github.com/rails/rails/commit/1515c4d98da3f730ef971fa5a13cad828bd9bef4), it looks like it passes `nil` and lets the database handle the collation, but I'm happy to change it if I misread the code.
[ci skip]
* FIX remove whitespace
[Nate Pinsky + Rafael Mendonça França]
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Prevent deadlocks when waiting for connection from pool.
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When a thread that had the load interlock but was blocked waiting to check a connection out of the connection pool but all of the threads using the available connections were blocked waiting to obtain the load interlock an `ActiveRecord::ConnectionTimeoutError` exception was be thrown by the thread waiting for the connection.
When waiting for the connection to check out we should allow loading to proceed to avoid this deadlock.
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Omit BEGIN/COMMIT statements for empty transactions
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If a transaction is opened and closed without any queries being run, we
can safely omit the `BEGIN` and `COMMIT` statements, as they only exist
to modify the connection's behaviour inside the transaction. This
removes the overhead of those statements when saving a record with no
changes, which makes workarounds like `save if changed?` unnecessary.
This implementation buffers transactions inside the transaction manager
and materializes them the next time the connection is used. For this to
work, the adapter needs to guard all connection use with a call to
`materialize_transactions`. Because of this, adapters must opt in to get
this new behaviour by implementing `supports_lazy_transactions?`.
If `raw_connection` is used to get a reference to the underlying
database connection, the behaviour is disabled and transactions are
opened eagerly, as we can't know how the connection will be used.
However when the connection is checked back into the pool, we can assume
that the application won't use the reference again and reenable lazy
transactions. This prevents a single `raw_connection` call from
disabling lazy transactions for the lifetime of the connection.
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This was introduced at 24f6bf0d96b58f2b2ef6a886c93d35cf8ce4f293.
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https://github.com/rails/rails/issues/31190
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The `Relation::Merger` has a problem that order values would be merged
as nested array.
That was caused an issue #33664 since if array value is passed to
`order` and first element in the array includes `?`, the array is
regarded as a prepared statement and bind variables.
https://api.rubyonrails.org/classes/ActiveRecord/Sanitization/ClassMethods.html#method-i-sanitize_sql_for_order
Just merging that as splat args like other values would fix the issue.
Fixes #33664.
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Fixes #33520.
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To prevent style check in review like https://github.com/rails/rails/pull/33608#discussion_r211087605.
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SQLite3 adapter `alter_table` method restores foreign keys
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Related to #33520
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use BacktraceCleaner for ActiveRecord verbose logging
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- Move changelog entry of #33530 up in order to preserve the chronology
since we always add new entries on the top of a changelog file.
- Clarify the changelog entry
- Clarify the docs of remove_foreign_key
- Ensure reversible of `remove_foreign_key` with `:primary_key` and `:to_table`
options.
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33515 invert remove foreign key support "to_table"
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