| Commit message (Collapse) | Author | Age | Files | Lines |
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Fix `relation.exists?` with giving both `distinct` and `offset`
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The `distinct` affects (reduces) rows of the result, so it is important
part when both `distinct` and `offset` are given.
Replacing SELECT clause to `1 AS one` and removing `distinct` and
`order` is just optimization for the `exists?`, we should not apply the
optimization for that case.
Fixes #35191.
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Bugfix has_many association #size when ids reader is cached and assoc…
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is changed
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Relation is not best place to do this.
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order by for metadata queries
Also, `test_has_one_does_not_use_order_by` should not check metadata queries.
Fixes #35098
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Improve naming in DatabaseSelector
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We're already in the resolver, we call this class "operations" in the
middleware, so we should use the same naming here.
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This is more consistent with Resolver, which has build called. This
allows using a Proc instead of a class, which could be nice if you need
to vary switching logic based on the request in a more ad-hoc way (ie.
check if it is an API request).
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callbacks
`relation.create` populates scope attributes to new record by `scoping`,
it is necessary to assign the scope attributes to the record and to find
STI subclass from the scope attributes.
But the effect of `scoping` is class global, it was caused undesired
behavior that pollute all class level querying methods in initialization
block and callbacks (`after_initialize`, `before_validation`,
`before_save`, etc), which are user provided code.
To avoid the leaking scope issue, restore the original current scope
before initialization block and callbacks are invoked.
Fixes #9894.
Fixes #17577.
Closes #31526.
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Don't use `false` as special value to skip to find inherited scope, we
could use `skip_inherited_scope = true`, and move `_scoping` back on
Relation.
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Formerly it was returning arguments (`records` array).
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Speed up partial rendering by caching "variable" calculation
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This commit speeds up rendering partials by caching the variable name
calculation on the template. The variable name is based on the "virtual
path" used for looking up the template. The same virtual path
information lives on the template, so we can just ask the cached
template object for the variable.
This benchmark takes a couple files, so I'll cat them below:
```
[aaron@TC ~/g/r/actionview (speed-up-partials)]$ cat render_benchmark.rb
require "benchmark/ips"
require "action_view"
require "action_pack"
require "action_controller"
class TestController < ActionController::Base
end
TestController.view_paths = [File.expand_path("test/benchmarks")]
controller_view = TestController.new.view_context
result = Benchmark.ips do |x|
x.report("render") do
controller_view.render("many_partials")
end
end
[aaron@TC ~/g/r/actionview (speed-up-partials)]$ cat test/benchmarks/test/_many_partials.html.erb
Looping:
<ul>
<% 100.times do |i| %>
<%= render partial: "list_item", locals: { i: i } %>
<% end %>
</ul>
[aaron@TC ~/g/r/actionview (speed-up-partials)]$ cat test/benchmarks/test/_list_item.html.erb
<li>Number: <%= i %></li>
```
Benchmark results (master):
```
[aaron@TC ~/g/r/actionview (master)]$ be ruby render_benchmark.rb
Warming up --------------------------------------
render 41.000 i/100ms
Calculating -------------------------------------
render 424.269 (± 3.5%) i/s - 2.132k in 5.031455s
```
Benchmark results (this branch):
```
[aaron@TC ~/g/r/actionview (speed-up-partials)]$ be ruby render_benchmark.rb
Warming up --------------------------------------
render 50.000 i/100ms
Calculating -------------------------------------
render 521.862 (± 3.8%) i/s - 2.650k in 5.085885s
```
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This follows up d97980a16d76ad190042b4d8578109714e9c53d0.
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Chaining named scope is no longer leaking to class level querying methods
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Active Record uses `scoping` to delegate to named scopes from relations
for propagating the chaining source scope. It was needed to restore the
source scope in named scopes, but it was caused undesired behavior that
pollute all class level querying methods.
Example:
```ruby
class Topic < ActiveRecord::Base
scope :toplevel, -> { where(parent_id: nil) }
scope :children, -> { where.not(parent_id: nil) }
scope :has_children, -> { where(id: Topic.children.select(:parent_id)) }
end
# Works as expected.
Topic.toplevel.where(id: Topic.children.select(:parent_id))
# Doesn't work due to leaking `toplevel` to `Topic.children`.
Topic.toplevel.has_children
```
Since #29301, the receiver in named scopes has changed from the model
class to the chaining source scope, so the polluting class level
querying methods is no longer required for that purpose.
Fixes #14003.
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If they're not set we'll still fall back to localhost, but this makes it
possible to run the tests against a remote Postgres / Redis / whatever.
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Bugfix association loading behavior when counter cache is zero
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Relax sqlite3 version dependency
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With this benchmark:
require "bundler/setup"
require "active_record"
require "benchmark/ips"
# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Schema.define do
create_table :posts, force: true do |t|
end
end
class Post < ActiveRecord::Base
end
new_post = Post.new
Benchmark.ips do |b|
b.report("present?") do
new_post.present?
end
b.report("blank?") do
new_post.blank?
end
end
Before:
Warming up --------------------------------------
present? 52.147k i/100ms
blank? 53.077k i/100ms
Calculating -------------------------------------
present? 580.184k (±21.8%) i/s - 2.555M in 5.427085s
blank? 601.537k (± 9.2%) i/s - 2.972M in 5.003503s
After:
Warming up --------------------------------------
present? 378.235k i/100ms
blank? 375.476k i/100ms
Calculating -------------------------------------
present? 17.381M (± 7.5%) i/s - 86.238M in 5.001815s
blank? 17.877M (± 6.4%) i/s - 88.988M in 5.004634s
This improvement is mostly because those methods were hitting
`method_missing` on a lot of levels to be able to return the value.
To avoid all this stack walking we are short-circuiting those methods.
Closes #35059.
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eileencodes/fix-query-cache-for-database-switching
Invalidate all query caches for current thread
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This change ensures that all query cahces are cleared across all
connections per handler for the current thread so if you write on one
connection the read will have the query cache cleared.
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eileencodes/allow-application-to-change-handler-names
Add ability to change the names of the default handlers
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When I wrote the `connected_to` and `connects_to` API's I wrote them
with the idea in mind that it didn't really matter what the
handlers/roles were called as long as those connecting to the roles knew
which one wrote and which one read.
With the introduction of the middleware Rails begins to assume it's
`writing` and `reading` and there's no room for other roles. At GitHub
we've been using this method for a long time so we have a ton of legacy
code that uses different handler names `default` and `readonly`. We
could rename all our code but I think this is better for a few reasons:
- Legacy apps that have been using multiple databases for a long time
can have an eaiser time switching.
- If we later find this to cause more issues than it's worth we can
easily deprecate.
- We won't force old apps to rewrite the resolver middleware just to use
a different handler.
Adding the writing_role/reading_role required that I move the code that
creates the first handler for writing to the railtie. If I didn't move
this the core class would assign the handler before I was able to assign
a new one in my configuration and I'd end up with 3 handlers instead of
2.
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Hint at advanced options for foreign_key
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We sometimes display simple examples of additional parameters that can be
supplied to table-wise methods like these and I found it particularly difficult
to figure out which options `t.foreign_key` accepts without drilling very deep
into the specific SchemaStatements docs.
Since it's relatively common to create foreign keys with custom column names or
primary keys, it seems like this should help quite a few people.
[ci skip]
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Refactor options for database selector middleware
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Right now we only have one option that's supported, the delay. However I
can see us supporting other options in the future.
This PR refactors the options to get passed into the resolver so whether
you're using middleware or using the config options you can pass options
to the resolver. This will also make it easy to add new options in the
future.
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Eagerly materialize the fixtures transaction
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The transaction used to restore fixtures is an implementation detail
that should be abstracted away. Idealy a test should behave the same
wether or not transactional fixtures are enabled.
However since transactions have been made lazy, the fixture
transaction started leaking into tests case. e.g. consider the
following (oversimplified) test:
```ruby
class SQLSubscriber
attr_accessor :sql
def initialize
@sql = []
end
def call(*, event)
sql << event[:sql]
end
end
subscriber = SQLSubscriber.new
ActiveSupport::Notifications.subscribe("sql.active_record", subscriber)
User.connection.execute('SELECT 1', 'Generic name')
assert_equal ['SELECT 1'], subscriber.sql
```
On Rails 6 it starts to break because the `sql` array will be `['BEGIN', 'SELECT 1']`.
Several things are wrong here:
- That transaction is not generated by the tested code, so it shouldn't be visible.
- The transaction is not even closed yet, which again doesn't reflect the reality.
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Fix has_many through association creation
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This reverts commit ed1eda271c7ac82ecb7bd94b6fa1b0093e648a3e, reversing
changes made to 3d2caab7dc92a13d4dd369678d5b4ce659df8e52.
Reason: 7c3da6e0030aa080fcb89af58b094ed50d861a44
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#33729 affected the behavior of the has_many through record creation.
Since #33729, the intermediate reflection of simple has_many through
association has `inverse_of` to the association, it causes extra through
record creation, the extra through record required valid before the
association record is saved.
https://github.com/rails/rails/blob/23125378673bcc606b274027666a126573e136f8/activerecord/lib/active_record/associations/has_many_through_association.rb#L95-L102
I think that #33729 need to more work to care about has_many through
association, that PR should be reverted to not break existing apps.
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I deprecated two unused attr_writers `visitor` and `indexes` at 8056fe0
and f4bc364 conservatively, since those are accidentaly exposed in the
docs.
https://api.rubyonrails.org/v5.2/classes/ActiveRecord/ConnectionAdapters/AbstractAdapter.html
https://api.rubyonrails.org/v5.2/classes/ActiveRecord/ConnectionAdapters/TableDefinition.html
But I've found that `view_renderer` attr_writer is removed without
deprecation at #35093, that is also exposed in the doc.
https://api.rubyonrails.org/v5.2/classes/ActionView/Base.html
I'd like to also remove the deprecated attr_writers since I think that
removing `visitor` and `indexes` attr_writers is as safe as removing
`view_renderer` attr_writer.
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We enabled `Style/RedundantBegin` cop at #34764, but it is hard to
detect an offence if returning value put after the block.
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We need to update using the timestamp from the end of the request, not
the start. For example, if a request spends 5+ seconds writing, we still
want to wait another 5 seconds for replication lag.
Since we now run the update after we yield, we need to use ensure to
make sure we update the timestamp even if there is an exception.
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Part 8: Multi db improvements, Adds basic automatic database switching to Rails
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The following PR adds behavior to Rails to allow an application to
automatically switch it's connection from the primary to the replica.
A request will be sent to the replica if:
* The request is a read request (`GET` or `HEAD`)
* AND It's been 2 seconds since the last write to the database (because
we don't want to send a user to a replica if the write hasn't made it
to the replica yet)
A request will be sent to the primary if:
* It's not a GET/HEAD request (ie is a POST, PATCH, etc)
* Has been less than 2 seconds since the last write to the database
The implementation that decides when to switch reads (the 2 seconds) is
"safe" to use in production but not recommended without adequate testing
with your infrastructure. At GitHub in addition to the a 5 second delay
we have a curcuit breaker that checks the replication delay
and will send the query to a replica before the 5 seconds has passed.
This is specific to our application and therefore not something Rails
should be doing for you. You'll need to test and implement more robust
handling of when to switch based on your infrastructure. The auto
switcher in Rails is meant to be a basic implementation / API that acts
as a guide for how to implement autoswitching.
The impementation here is meant to be strict enough that you know how to
implement your own resolver and operations classes but flexible enough
that we're not telling you how to do it.
The middleware is not included automatically and can be installed in
your application with the classes you want to use for the resolver and
operations passed in. If you don't pass any classes into the middleware
the Rails default Resolver and Session classes will be used.
The Resolver decides what parameters define when to
switch, Operations sets timestamps for the Resolver to read from. For
example you may want to use cookies instead of a session so you'd
implement a Resolver::Cookies class and pass that into the middleware
via configuration options.
```
config.active_record.database_selector = { delay: 2.seconds }
config.active_record.database_resolver = MyResolver
config.active_record.database_operations = MyResolver::MyCookies
```
Your classes can inherit from the existing classes and reimplment the
methods (or implement more methods) that you need to do the switching.
You only need to implement methods that you want to change. For example
if you wanted to set the session token for the last read from a replica
you would reimplement the `read_from_replica` method in your resolver
class and implement a method that updates a new timestamp in your
operations class.
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eileencodes/fix-case-when-url-in-url-config-is-nil
Fix case when we want a UrlConfig but the URL is nil
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Previously if the `url` key in a config hash was nil we'd ignore the
configuration as invalid. This can happen when you're relying on a
`DATABASE_URL` in the env and that is not set in the environment.
```
production:
<<: *default
url: ENV['DATABASE_URL']
```
This PR fixes that case by checking if there is a `url` key in the
config instead of checking if the `url` is not nil in the config.
In addition to changing the conditional we then need to build a url hash
to merge with the original hash in the `UrlConfig` object.
Fixes #35091
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- Remove `fragment_cache_key` helper declaration.
It was removed in e70d3df7c9b05c129b0fdcca57f66eca316c5cfc
- Remove `by_private_lifo`.
It is unused since a7becf147afc85c354e5cfa519911a948d25fc4d
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MySQL: Support `:size` option to change text and blob size
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