| Commit message (Collapse) | Author | Age | Files | Lines |
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Follow up of #31513.
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Originally the `JoinDependency` has the deduplication for eager loading
(LEFT JOIN). This re-uses that deduplication for `left_joins`.
And also, This makes left join order into part of joins, i.e.:
Before:
```
association joins -> stash joins (eager loading, etc) -> string joins -> left joins
```
After:
```
association joins -> stash joins (eager loading, left joins, etc) -> string joins
```
Now string joins are able to refer left joins.
Fixes #34325.
Fixes #34332.
Fixes #34536.
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This follows up ebc09ed9ad9a04338138739226a1a92c7a2707ee.
We've still experienced a regression for `size` (`count(:all)`) with
eager loading and explicit select and order when upgrading Rails to 5.1.
In that case, the eager loading enforces `distinct` to subselect but
still keep the custom select, it would cause the ORDER BY with DISTINCT
issue.
```
% ARCONN=postgresql bundle exec ruby -w -Itest test/cases/relations_test.rb -n test_size_with_eager_loading_and_custom_select_and_order
Using postgresql
Run options: -n test_size_with_eager_loading_and_custom_select_and_order --seed 8356
# Running:
E
Error:
RelationTest#test_size_with_eager_loading_and_custom_select_and_order:
ActiveRecord::StatementInvalid: PG::InvalidColumnReference: ERROR: for SELECT DISTINCT, ORDER BY expressions must appear in select list
LINE 1: ..." ON "comments"."post_id" = "posts"."id" ORDER BY comments.i...
^
```
As another problem on `distinct` is enforced, the result of `count`
becomes fewer than expected if `select` is given explicitly.
e.g.
```ruby
Post.select(:type).count
# => 11
Post.select(:type).distinct.count
# => 3
```
As long as `distinct` is enforced, we need to care to keep the result of
`count`.
This fixes both the `count` with eager loading problems.
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`CollectionCacheKey#collection_cache_key`
The implementation of `Relation#cache_key` depends on some internal
relation methods (e.g. `apply_join_dependency`, `build_subquery`), but
somehow that implementation exists on the model class
(`collection_cache_key`), it sometimes bothers to me.
This refactors that implementation moves to `Relation#cache_key`, then
we can avoid `send` to call internal methods.
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I've experienced this issue in our app, some hints only works on Top
level query (e.g. `MAX_EXECUTION_TIME`).
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regression for fixture loading
d8d6bd5 makes fixture loading to bulk statements by using
`execute_batch` for sqlite3 adapter. But `execute_batch` is slower and
it caused the performance regression for fixture loading.
In sqlite3 1.4.0, it have new batch method `execute_batch2`. I've
confirmed `execute_batch2` is extremely faster than `execute_batch`.
So I think it is worth to upgrade sqlite3 to 1.4.0 to use that method.
Before:
```
% ARCONN=sqlite3 bundle exec ruby -w -Itest test/cases/associations/eager_test.rb -n test_eager_loading_too_may_ids
Using sqlite3
Run options: -n test_eager_loading_too_may_ids --seed 35790
# Running:
.
Finished in 202.437406s, 0.0049 runs/s, 0.0049 assertions/s.
1 runs, 1 assertions, 0 failures, 0 errors, 0 skips
ARCONN=sqlite3 bundle exec ruby -w -Itest -n test_eager_loading_too_may_ids 142.57s user 60.83s system 98% cpu 3:27.08 total
```
After:
```
% ARCONN=sqlite3 bundle exec ruby -w -Itest test/cases/associations/eager_test.rb -n test_eager_loading_too_may_ids
Using sqlite3
Run options: -n test_eager_loading_too_may_ids --seed 16649
# Running:
.
Finished in 8.471032s, 0.1180 runs/s, 0.1180 assertions/s.
1 runs, 1 assertions, 0 failures, 0 errors, 0 skips
ARCONN=sqlite3 bundle exec ruby -w -Itest -n test_eager_loading_too_may_ids 10.71s user 1.36s system 95% cpu 12.672 total
```
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Cache database version in schema cache
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* The database version will get cached in the schema cache file during the
schema cache dump. When the database version check happens, the version will
be pulled from the schema cache and thus avoid querying the database for
the version.
* If the schema cache file doesn't exist, we'll query the database for the
version and cache it on the schema cache object.
* To facilitate this change, all connection adapters now implement
#get_database_version and #database_version. #database_version returns the
value from the schema cache.
* To take advantage of the cached database version, the database version check
will now happen after the schema cache is set on the connection in the
connection pool.
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`@changed_attributes` is no longer used since #30985.
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* s/Postgres/PostgreSQL/
* s/MYSQL/MySQL/, s/Mysql/MySQL/
* s/Sqlite/SQLite/
Replaced all newly added them after 6089b31.
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:create, :update ]`. (#35804)
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Add db:prepare rake task.
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It Creates the database, loads the schema, run the migrations and initializes with the seed data
(use db:reset to also drop the database first). This rake task runs in an idempotent way
ref https://github.com/rails/rails/pull/33139#discussion_r195930751
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`delete_all`
This partly reverts #35617.
#35617 includes unused code (for `InsertStatement`) and re-using query
annotation for `update_all` and `delete_all`, which has not been
discussed yet.
If a relation has any annotation, I think it is mostly for SELECT query,
so re-using annotation by default is not always desired behavior for me.
We should discuss about desired behavior before publishing the
implementation.
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Update API doc for #includes on unnecessary #references
[ci skip]
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Update doc for #includes to clarify that #references is unnecessary when conditions are passed into #includes as a hash.
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Add dirty methods for store accessors
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Fix callbacks on has_many :through associations
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When adding a child record via a has_many :through association,
build_through_record would previously build the join record, and then
assign the child record and source_type option to it. Because the
before_add and after_add callbacks are called as part of build, however,
this caused the callbacks to receive incomplete records, specifically
without the other end of the has_many :through association. Collecting
all attributes before building the join record ensures the callbacks
receive the fully constructed record.
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record (#35784)
* Add `ActiveRecord::Relation#extract_associated` for extracting associated records from a relation
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Fix preloader to never reset associations in case they are already loaded
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This patch fixes the issue when association is preloaded with a custom
preload scope which disposes the already preloaded target of the
association by reseting it.
When custom preload scope is used, the preloading is now performed into
a separated Hash - #records_by_owner instead of the association.
It removes the necessaty the reset the association after the preloading
is complete so that reset of the preloaded association never happens.
Preloading is still happening to the association when the preload scope
is empty.
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Bugfix: Fix false autosave for has_one :through association
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Fixes #35680
The problem occurred, when a `has one through` association contains
a foreign key (it belongs to the intermediate association).
For example, Comment belongs to Post, Post belongs to Author, and Author
`has_one :first_comment, through: :first_post`.
In this case, the value of the foreign key is comparing with the original
record, and since they are likely different, the association is marked
as changed. So it updates every time when the origin record updates.
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This patch has two main portions:
1. Add SQL comment support to Arel via Arel::Nodes::Comment.
2. Implement a Relation#annotate method on top of that.
== Adding SQL comment support
Adds a new Arel::Nodes::Comment node that represents an optional SQL
comment and teachers the relevant visitors how to handle it.
Comment nodes may be added to the basic CRUD statement nodes and set
through any of the four (Select|Insert|Update|Delete)Manager objects.
For example:
manager = Arel::UpdateManager.new
manager.table table
manager.comment("annotation")
manager.to_sql # UPDATE "users" /* annotation */
This new node type will be used by ActiveRecord::Relation to enable
query annotation via SQL comments.
== Implementing the Relation#annotate method
Implements `ActiveRecord::Relation#annotate`, which accepts a comment
string that will be appeneded to any queries generated by the relation.
Some examples:
relation = Post.where(id: 123).annotate("metadata string")
relation.first
# SELECT "posts".* FROM "posts" WHERE "posts"."id" = 123
# LIMIT 1 /* metadata string */
class Tag < ActiveRecord::Base
scope :foo_annotated, -> { annotate("foo") }
end
Tag.foo_annotated.annotate("bar").first
# SELECT "tags".* FROM "tags" LIMIT 1 /* foo */ /* bar */
Also wires up the plumbing so this works with `#update_all` and
`#delete_all` as well.
This feature is useful for instrumentation and general analysis of
queries generated at runtime.
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* Show options as list.
* Fix incorrect quoting.
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Document option forwarding in ActiveRecord::Base.attribute
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This has been supported for a while but we didn't have documentation
for it.
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I found `:unique_by` with `:columns` and `:where` inside it tough to
grasp. The documentation only mentioned indexes and partial indexes.
So why duplicate a model's indexes in an insert_all/upsert_all call
when we can just look it up?
This has the added benefit of raising if no index is found, such that
people can't insert thousands of records without relying on an index
of some form.
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shioyama/generated_attribute_methods_namespaced_constant
Give GeneratedAttributeMethods module a name
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Currently GeneratedAttributeMethods is a module builder class, an
instance of which is included in every AR class. OTOH,
GeneratedAssociatedMethods is assigned to a constant under the model
namespace. This is inconsistent and looks strange in the list of
ancestors.
There is no particular reason *not* to assign a constant for this (very
important) module under the model namespace, so that's what this commit
does.
Previous to this change, ancestors for an AR class looked like this:
```
=> [User (call 'User.connection' to establish a connection),
User::GeneratedAssociationMethods,
#<ActiveRecord::AttributeMethods::GeneratedAttributeMethods:0x000055ace0f05b08>,
ApplicationRecord(abstract),
ApplicationRecord::GeneratedAssociationMethods,
#<ActiveRecord::AttributeMethods::GeneratedAttributeMethods:0x000055ace093c460>,
ActiveRecord::Base,
...
```
With this change, they look like this:
```
=> [User (call 'User.connection' to establish a connection),
User::GeneratedAssociationMethods,
User::GeneratedAttributeMethods,
ApplicationRecord(abstract),
ApplicationRecord::GeneratedAssociationMethods,
ApplicationRecord::GeneratedAttributeMethods,
ActiveRecord::Base,
...
```
The previously named `GeneratedAttributeMethods` module builder class is
renamed `GeneratedAttributeMethodsBuilder` to emphasize that this is not
a module but a class.
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Extract `sanitize_as_sql_comment` from SQL visitor into connection
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