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Because `info[:version]` is a client version, the server version is
`server_info[:version]`.
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encapsulate all arguments
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PostgreSQL is strict about the usage of `DISTINCT` and `ORDER BY`, which
one of the tests demonstrated. The order clause is never going to be
relevant in the query we're performing, so let's just remove it
entirely.
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Add #cache_key to ActiveRecord::Relation.
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When a symbol is passed in, we call `to_s` on it which allocates a string. The two hardcoded symbols that are used internally are `:to_partial_path` and `:to_model`.
This change buys us 71,136 bytes of memory and 1,777 fewer objects per request.
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Fix misleading errors for has_one through relations
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This is an alternate implementation of #20966.
[Sean Griffin & presskey]
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Deep down in the association internals, we're calling `destroy!` rather
than `destroy` when handling things like `dependent` or autosave
association callbacks. Unfortunately, due to the structure of the code
(e.g. it uses callbacks for everything), it's nearly impossible to pass
whether to call `destroy` or `destroy!` down to where we actually need
it.
As such, we have to do some legwork to handle this. Since the callbacks
are what actually raise the exception, we need to rescue it in
`ActiveRecord::Callbacks`, rather than `ActiveRecord::Persistence` where
it matters. (As an aside, if this code wasn't so callback heavy, it
would handling this would likely be as simple as changing `destroy` to
call `destroy!` instead of the other way around).
Since we don't want to lose the exception when `destroy!` is called (in
particular, we don't want the value of the `record` field to change to
the parent class), we have to do some additional legwork to hold onto it
where we can use it.
Again, all of this is ugly and there is definitely a better way to do
this. However, barring a much more significant re-architecting for what
I consider to be a reletively minor improvement, I'm willing to take
this small hit to the flow of this code (begrudgingly).
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arunagw/aa-remove-unused-rule-and-task-activerecord
Remove unused rule and task from activerecord
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this fixes a failing test case
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The note regarding the `_prefix` and `_suffix` options is no longer
useful since they were renamed specifically for this purpose.
Also the given example doesn't show what these options enable and in
which case they are really useful (when there are conflicting values
for instance).
Refs #20999.
[Godfrey Chan & Robin Dupret]
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This makes it more clear that they are reserved keywords and also it
seems less redundant as the line already starts with the call to the
`enum` method.
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Documentation had extra colon after keyword.
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ActiveRecord::RecordNotFound modified to store model name, primary_key
and id of the caller model. It allows the catcher of this exception to make
a better decision to what to do with it. For example consider this simple
example:
class SomeAbstractController < ActionController::Base
rescue_from ActiveRecord::RecordNotFound, with: :redirect_to_404
private def redirect_to_404(e)
return redirect_to(posts_url) if e.model == 'Post'
raise
end
end
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Previously `has_one` and `has_many` associations were using the
`one` and `many` keys respectively. Both of these keys have special
meaning in I18n (they are considered to be pluralizations) so by
renaming them to `has_one` and `has_many` we make the messages more
explicit and most importantly they don't clash with linguistical
systems that need to validate translation keys (and their
pluralizations).
The `:'restrict_dependent_destroy.one'` key should be replaced with
`:'restrict_dependent_destroy.has_one'`, and
`:'restrict_dependent_destroy.many'` with
`:'restrict_dependent_destroy.has_many'`.
[Roque Pinel & Christopher Dell]
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support it. Fixes #19711
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This clears the transaction record state when the transaction finishes
with a `:committed` status.
Considering the following example where `name` is a required attribute.
Before we had `new_record?` returning `true` for a persisted record:
```ruby
author = Author.create! name: 'foo'
author.name = nil
author.save # => false
author.new_record? # => true
```
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As per the docs, `mark_for_destruction` should do nothing if `autosave`
is not set to true. We normally persist associations on a record no
matter what if the record is a new record, but we were always skipping
records which were `marked_for_destruction?`.
Fixes #20882
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Add missing method name to exception description
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Freeze string literals when not mutated.
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I wrote a utility that helps find areas where you could optimize your program using a frozen string instead of a string literal, it's called [let_it_go](https://github.com/schneems/let_it_go). After going through the output and adding `.freeze` I was able to eliminate the creation of 1,114 string objects on EVERY request to [codetriage](codetriage.com). How does this impact execution?
To look at memory:
```ruby
require 'get_process_mem'
mem = GetProcessMem.new
GC.start
GC.disable
1_114.times { " " }
before = mem.mb
after = mem.mb
GC.enable
puts "Diff: #{after - before} mb"
```
Creating 1,114 string objects results in `Diff: 0.03125 mb` of RAM allocated on every request. Or 1mb every 32 requests.
To look at raw speed:
```ruby
require 'benchmark/ips'
number_of_objects_reduced = 1_114
Benchmark.ips do |x|
x.report("freeze") { number_of_objects_reduced.times { " ".freeze } }
x.report("no-freeze") { number_of_objects_reduced.times { " " } }
end
```
We get the results
```
Calculating -------------------------------------
freeze 1.428k i/100ms
no-freeze 609.000 i/100ms
-------------------------------------------------
freeze 14.363k (± 8.5%) i/s - 71.400k
no-freeze 6.084k (± 8.1%) i/s - 30.450k
```
Now we can do some maths:
```ruby
ips = 6_226k # iterations / 1 second
call_time_before = 1.0 / ips # seconds per iteration
ips = 15_254 # iterations / 1 second
call_time_after = 1.0 / ips # seconds per iteration
diff = call_time_before - call_time_after
number_of_objects_reduced * diff * 100
# => 0.4530373333993266 miliseconds saved per request
```
So we're shaving off 1 second of execution time for every 220 requests.
Is this going to be an insane speed boost to any Rails app: nope. Should we merge it: yep.
p.s. If you know of a method call that doesn't modify a string input such as [String#gsub](https://github.com/schneems/let_it_go/blob/b0e2da69f0cca87ab581022baa43291cdf48638c/lib/let_it_go/core_ext/string.rb#L37) please [give me a pull request to the appropriate file](https://github.com/schneems/let_it_go/blob/b0e2da69f0cca87ab581022baa43291cdf48638c/lib/let_it_go/core_ext/string.rb#L37), or open an issue in LetItGo so we can track and freeze more strings.
Keep those strings Frozen
![](https://www.dropbox.com/s/z4dj9fdsv213r4v/let-it-go.gif?dl=1)
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Since the counter cache was properly being updated, the model became
stale. Simply reloading the model before attempting to destroy is
sufficient for this case. I believe this is enough of an edge case to be
a valid change to the tests, even though it represents a potential
breaking change.
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Also removes a false positive test that depends on the fixed bug:
At this time, counter_cache does not work with polymorphic relationships
(which is a bug). The test was added to make sure that no
StaleObjectError is raised when the car is destroyed. No such error is
currently raised because the lock version is not incremented by
appending a wheel to the car.
Furthermore, `assert_difference` succeeds because `car.wheels.count`
does not check the counter cache, but the collection size. The test will
fail if it is replaced with `car.wheels_count || 0`.
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[ci skip] Fix typo in #any? RDoc
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Ensure that 'ActionController::Parameters' can still be passed to AR …
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collection associations
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This code is so fucked. Things that cause this bug not to replicate:
- Defining the validation before the association (we end up calling
`uniq!` on the errors in the autosave validation)
- Adding `accepts_nested_attributes_for` (I have no clue why. The only
thing it does that should affect this is adds `autosave: true` to the
inverse reflection, and doing that manually doesn't fix this).
This solution is a hack, and I'm almost certain there's a better way to
go about it, but this shouldn't cause a huge hit on validation times,
and is the simplest way to get it done.
Fixes #20874.
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Since nested hashes are also instances of
`ActionController::Parameters`, and we're explicitly looking to work
with a hash for nested attributes, this caused breakage in several
points.
This is the minimum viable fix for the issue (and one that I'm not
terribly fond of). I can't think of a better place to handle this at the
moment. I'd prefer to use some sort of solution that doesn't special
case AC::Parameters, but we can't use something like `to_h` or `to_a`
since `Enumerable` adds both.
While I've added a trivial test case for verifying this fix in
isolation, we really need better integration coverage to prevent
regressions like this in the future. We don't actually have a lot of
great places for integration coverage at the moment, so I'm deferring it
for now.
Fixes #20922.
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We deprecate the support for passing an argument to force reload in
6eae366d0d2e5d5211eeaf955f56bd1dc6836758. That led to several
deprecation warning when running Active Record test suite.
This commit silence the warnings by properly calling `#reload` on the
association proxy or on the association object instead. However, there
are several places that `ActiveSupport::Deprecation.silence` are used as
those tests actually tests the force reload functionality and will be
removed once `master` is targeted next minor release (5.1).
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This is to simplify the association API, as you can call `reload` on the
association proxy or the parent object to get the same result.
For collection association, you can call `#reload` on association proxy
to force a reload:
@user.posts.reload # Instead of @user.posts(true)
For singular association, you can call `#reload` on the parent object to
clear its association cache then call the association method:
@user.reload.profile # Instead of @user.profile(true)
Passing a truthy argument to force association to reload will be removed
in Rails 5.1.
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Revert "Revert "Reduce allocations when running AR callbacks.""
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This reverts commit bdc1d329d4eea823d07cf010064bd19c07099ff3.
Before:
Calculating -------------------------------------
22.000 i/100ms
-------------------------------------------------
229.700 (± 0.4%) i/s - 1.166k
Total Allocated Object: 9939
After:
Calculating -------------------------------------
24.000 i/100ms
-------------------------------------------------
246.443 (± 0.8%) i/s - 1.248k
Total Allocated Object: 7939
```
begin
require 'bundler/inline'
rescue LoadError => e
$stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
raise e
end
gemfile(true) do
source 'https://rubygems.org'
# gem 'rails', github: 'rails/rails', ref: 'bdc1d329d4eea823d07cf010064bd19c07099ff3'
gem 'rails', github: 'rails/rails', ref: 'd2876141d08341ec67cf6a11a073d1acfb920de7'
gem 'arel', github: 'rails/arel'
gem 'sqlite3'
gem 'benchmark-ips'
end
require 'active_record'
require 'benchmark/ips'
ActiveRecord::Base.establish_connection('sqlite3::memory:')
ActiveRecord::Migration.verbose = false
ActiveRecord::Schema.define do
create_table :users, force: true do |t|
t.string :name, :email
t.boolean :admin
t.timestamps null: false
end
end
class User < ActiveRecord::Base
default_scope { where(admin: true) }
end
admin = true
1000.times do
attributes = {
name: "Lorem ipsum dolor sit amet, consectetur adipiscing elit.",
email: "foobar@email.com",
admin: admin
}
User.create!(attributes)
admin = !admin
end
GC.disable
Benchmark.ips(5, 3) do |x|
x.report { User.all.to_a }
end
key =
if RUBY_VERSION < '2.2'
:total_allocated_object
else
:total_allocated_objects
end
before = GC.stat[key]
User.all.to_a
after = GC.stat[key]
puts "Total Allocated Object: #{after - before}"
```
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The concurrent-ruby gem is a toolset containing many concurrency
utilities. Many of these utilities include runtime-specific
optimizations when possible. Rather than clutter the Rails codebase with
concurrency utilities separate from the core task, such tools can be
superseded by similar tools in the more specialized gem. This commit
replaces `ActiveSupport::Concurrency::Latch` with
`Concurrent::CountDownLatch`, which is functionally equivalent.
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When preload is used in a default scope the preload_values were
returning nested arrays and causing the preloader to fail because it
doesn't know how to deal with nested arrays. So before calling preload!
we need to splat the arguments.
This is not needed to includes because it flatten its arguments.
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tampering attacks.
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as #uniq will be removed from Rails 5.0 as per the Active Support
exception raised:
ActiveSupport::DeprecationException: DEPRECATION WARNING: uniq is
deprecated and will be removed from Rails 5.0 (use distinct instead).
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Not much of a thought leader if I can't spell it correctly :wink:
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