Previously we only provided a method to set the ignored schema cache
tables, but there was no way to ask if a table was ignored by the schema
cache. Applications may want to implement their own schema cache, or at
least run this check. Rather than forcing them to implement an internal
method, this adds a way to ask whether a table is ignored by the schema
cache code.
Usage:
```ruby
ActiveRecord.schema_cache_ignored_tables = ["developers"]
ActiveRecord.schema_cache_ignored_tables?("developers")
```
which respects reject_if and is in nested_attributes order.
When in default index_errors:true mode,
fix#24390 and return index based on full association order.
This commit adds a deprecation warning for the `query_constraints:`
association option. This option will change behavior in the future versions
of Rails and applications are encouraged to switch to `foreign_key:` to preserve the
current behavior.
```ruby
Post.with_recursive(
post_and_replies: [
Post.where(id: 42),
Post.joins('JOIN post_and_replies ON posts.in_reply_to_id = post_and_replies.id'),
]
)
```
Generates the following SQL:
```sql
WITH RECURSIVE "post_and_replies" AS (
(SELECT "posts".* FROM "posts" WHERE "posts"."id" = 42)
UNION ALL
(SELECT "posts".* FROM "posts" JOIN post_and_replies ON posts.in_reply_to_id = post_and_replies.id)
)
SELECT "posts".* FROM "posts"
```
at the connection level
Fix#51448
Type cast columns of type `date` to ruby `Date` when running a raw
query through `ActiveRecord::Base.connection.select_all`.
Before:
```ruby
person = Person.find(1)
person.strict_loading!(mode: :n_plus_one_only)
person.posts.first
# SELECT * FROM posts WHERE person_id = 1; -- non-deterministic order
```
After:
```ruby
person = Person.find(1)
person.strict_loading!(mode: :n_plus_one_only)
person.posts.first # this is 1+1, not N+1
# SELECT * FROM posts WHERE person_id = 1 ORDER BY id LIMIT 1;
```
Strict loading in `:n_plus_one_only` mode is designed to prevent performance issues when
deeply traversing associations. It allows `Person.find(1).posts`, but _not_
`Person.find(1).posts.map(&:category)`. With this change, child associations are no
longer eagerly loaded, to match intended behavior and to prevent non-deterministic
order issues caused by calling methods like `first` or `last`.
Fixes#49473.
Ref: https://github.com/rails/rails/pull/26103
Ref: https://github.com/rails/rails/pull/51426
A fairly common mistake with Rails is to enqueue a job from inside a
transaction, and a record as argumemnt, which then lead to a RecordNotFound
error when picked up by the queue.
This is even one of the arguments advanced for job runners backed by the
database such as `solid_queue`, `delayed_job` or `good_job`. But relying
on this is undesirable iin my opinion as it makes the Active Job abstraction
leaky, and if in the future you need to migrate to another backend or even
just move the queue to a separate database, you may experience a lot of race
conditions of the sort.
But more generally, being able to defer work to after the current transaction
has been a missing feature of Active Record. Right now the only way to do it
is from a model callback, and this forces moving things in Active Record
models that sometimes are better done elsewhere. Even as a self-proclaimed
"service object skeptic", I often wanted this capability over the last decade,
and I'm sure it got asked or desired by many more people.
Also there's some 3rd party gems adding this capability using monkey patches.
It's not a reason to upstream the capability, but it's a proof that there is
demand for it.
Implementation wise, this proof of concept shows that it's not really hard to
implement, even with nested multi-db transactions support.
Co-Authored-By: Cristian Bica <cristian.bica@gmail.com>
This commit makes two types of queries retry-able by opting into our `allow_retry` flag:
1) SELECT queries we construct by walking the Arel tree via `#to_sql_and_binds`. We use a
new `retryable` attribute on collector classes, which defaults to true for most node types,
but will be set to false for non-idempotent node types (functions, SQL literals, etc). The
`retryable` value is returned from `#to_sql_and_binds` and used by `#select_all` and
passed down the call stack, eventually reaching the adapter's `#internal_exec_query` method.
Internally-generated SQL literals are marked as retryable via a new `retryable` attribute on
`Arel::Nodes::SqlLiteral`.
2) `#find` and `#find_by` queries with known attributes. We set `allow_retry: true` in `#cached_find_by`,
and pass this down to `#find_by_sql` and `#_query_by_sql`.
These changes ensure that queries we know are safe to retry can be retried automatically.
Controls whether `ActiveRecord::Base.connection` raises an error, emits a deprecation warning, or neither.
`ActiveRecord::Base.connection` checkouts a database connection from the pool and keep it leased until the end of
the request or job. This behavior can be undesirable in environments that use many more threads or fibers than there
is available connections.
This configuration can be used to track down and eliminate code that calls `ActiveRecord::Base.connection` and
migrate it to use `ActiveRecord::Base.with_connection` instead.
The default behavior remains unchanged, and there is currently no plans to change the default.
This adds a `dirties` option to `ActiveRecord::Base.uncached` and
`ActiveRecord::ConnectionAdapters::ConnectionPool#uncached`.
Setting `dirties` to `false`, means database writes to the connection
pool will not mark any query caches as dirty.
The option defaults to `true` which retains the existing behaviour and
clears query caches on all connection pools used by the current thread.
Co-authored-by: Jeremy Daer <jeremy@rubyonrails.org>
Replaced by `#lease_connection` to better reflect what it does.
`ActiveRecord::Base#connection` is deprecated in the same way
but without a removal timeline nor a deprecation warning.
Inside the Active Record test suite, we do remove `Base.connection`
to ensure it's not used internally.
Some callsites have been converted to use `with_connection`,
some other have been more simply migrated to `lease_connection`
and will serve as a list of callsites to convert for
https://github.com/rails/rails/pull/50793
```ruby
assert_equal "Ruby on Rails", web_sites(:rubyonrails).name
assert_equal "Ruby on Rails", fixture(:web_sites, :rubyonrails).name
```
This was brought to me by someone with a `Metadata` model. The fixtures
accessor being `metadata` which conflicts with the `metadata` method
recently added in `Minitest`.
* relation#order supports hash like relation#where
This allows for an ActiveRecord::Relation to take a hash such as
`Topic.includes(:posts).order(posts: { created_at: :desc })`
* use is_a? to support subclasses of each
Co-authored-by: Rafael Mendonça França <rafael@rubyonrails.org>
