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Closes #3313
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Conflicts:
guides/source/active_record_validations.md
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skip]
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At present, ActiveRecord::Delegation compiles delegation methods on a
global basis. The compiled methods apply to all subsequent Relation
instances. This creates several problems:
1) After Post.all.recent has been called, User.all.respond_to?(:recent)
will be true, even if User.all.recent will actually raise an error due
to no User.recent method existing. (See #8080.)
2) Depending on the AR class, the delegation should do different things.
For example, if a Post.zip method exists, then Post.all.zip should call
it. But this will then result in User.zip being called by a subsequent
User.all.zip, even if User.zip does not exist, when in fact
User.all.zip should call User.all.to_a.zip. (There are various
variants of this problem.)
We are creating these compiled delegations in order to avoid method
missing and to avoid repeating logic on each invocation.
One way of handling these issues is to add additional checks in various
places to ensure we're doing the "right thing". However, this makes the
compiled methods signficantly slower. In which case, there's almost no
point in avoiding method_missing at all. (See #8127 for a proposed
solution which takes this approach.)
This is an alternative approach which involves creating a subclass of
ActiveRecord::Relation for each AR class represented. So, with this
patch, Post.all.class != User.all.class. This means that the delegations
are compiled for and only apply to a single AR class. A compiled method
for Post.all will not be invoked from User.all.
This solves the above issues without incurring significant performance
penalties. It's designed to be relatively seamless, however the downside
is a bit of complexity and potentially confusion for a user who thinks
that Post.all and User.all should be instances of the same class.
Benchmark
---------
require 'active_record'
require 'benchmark/ips'
class Post < ActiveRecord::Base
establish_connection adapter: 'sqlite3', database: ':memory:'
connection.create_table :posts
def self.omg
:omg
end
end
relation = Post.all
Benchmark.ips do |r|
r.report('delegation') { relation.omg }
r.report('constructing') { Post.all }
end
Before
------
Calculating -------------------------------------
delegation 4392 i/100ms
constructing 4780 i/100ms
-------------------------------------------------
delegation 144235.9 (±27.7%) i/s - 663192 in 5.038075s
constructing 182015.5 (±21.2%) i/s - 850840 in 5.005364s
After
-----
Calculating -------------------------------------
delegation 6677 i/100ms
constructing 6260 i/100ms
-------------------------------------------------
delegation 166828.2 (±34.2%) i/s - 754501 in 5.001430s
constructing 116575.5 (±18.6%) i/s - 563400 in 5.036690s
Comments
--------
Bear in mind that the standard deviations in the above are huge, so we
can't compare the numbers too directly. However, we can conclude that
Relation construction has become a little slower (as we'd expect), but
not by a huge huge amount, and we can still construct a large number of
Relations quite quickly.
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Keying these hashes by klass causes reloadable classes to never get
freed. Thanks to @thedarkone for pointing this out in
the comments on 221571beb6b4bb7437989bdefaf421f993ab6002.
This doesn't seem to make a massive difference to performance.
Benchmark
---------
require 'active_record'
require 'benchmark/ips'
class Post < ActiveRecord::Base
establish_connection adapter: 'sqlite3', database: ':memory:'
end
GC.disable
Benchmark.ips(20) do |r|
r.report { Post.connection }
end
Before
------
Calculating -------------------------------------
5632 i/100ms
-------------------------------------------------
218671.0 (±1.9%) i/s - 4364800 in 19.969401s
After
-----
Calculating -------------------------------------
8743 i/100ms
-------------------------------------------------
206525.9 (±17.8%) i/s - 4039266 in 19.992590s
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These are for internal use only and cannot be relied on as part of the
public API. See discussion on 8c2c60511beaad05a218e73c4918ab89fb1804f0.
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Inheritance#discriminate_class_for_record handle STI lookup duties.
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Allows you to do BaseClass.new(:type => "SubClass") as well as
parent.children.build(:type => "SubClass") or parent.build_child
to initialize an STI subclass. Ensures that the class name is a
valid class and that it is in the ancestors of the super class
that the association is expecting.
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Rather than just raising a NoMethodError when copying the config, this
commit adds a warning message until either the rails-observers gem is
installed or the relevant config options are removed.
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They was extracted from a plugin.
See https://github.com/rails/rails-observers
[Rafael Mendonça França + Steve Klabnik]
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Fixes #7418.
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We are already in the AR namespace, there's no way for it to be
undefined. See the cousin commit 13e72db77063f57c3028a906690d42fb068845bb
Refactor a bit teardown fixtures to avoid two conditionals.
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Setting a nil datetime attribute to a blank string should not cause the
attribute to be dirty.
Fix #8310
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prevent mass assignment of polymorphic type when using `build`
Conflicts:
activerecord/CHANGELOG.md
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Closes #8265
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Since edd94cee9af1688dd036fc58fd405adb30a5e0da, CollectionProxy
delegates all calculation methods - except count - to the scope,
which does basically what this method was doing, but since we're
delegating from the proxy, the association method was never called.
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To perform a sum calculation over the array of elements, use to_a.sum(&block).
Please check the discussion in f9cb645dfcb5cc89f59d2f8b58a019486c828c73
for more context.
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This reverts commit f9cb645dfcb5cc89f59d2f8b58a019486c828c73.
Conflicts:
activerecord/CHANGELOG.md
Revert "Allow blocks for count with ActiveRecord::Relation. Document and test that sum allows blocks"
This reverts commit 9cc2bf69ce296b7351dc612a8366193390a305f3.
Conflicts:
activerecord/lib/active_record/relation/calculations.rb
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This improves memory and performance without having to use symbols which
present DoS problems. Thanks @headius and @tenderlove for the
suggestion.
This was originally committed in
f1765019ce9b6292f2264b4601dad5daaffe3a89, and then reverted in
d3494903719682abc0948bef290af0d3d7b5a440 due to it causing problems in a
real application. This second attempt should solve that.
Benchmark
---------
require 'active_record'
require 'benchmark/ips'
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
class Post < ActiveRecord::Base
connection.create_table :posts, force: true do |t|
t.string :name
end
end
post = Post.create name: 'omg'
Benchmark.ips do |r|
r.report('Post.new') { Post.new name: 'omg' }
r.report('post.name') { post.name }
r.report('post.name=') { post.name = 'omg' }
r.report('Post.find(1).name') { Post.find(1).name }
end
Before
------
Calculating -------------------------------------
Post.new 1419 i/100ms
post.name 7538 i/100ms
post.name= 3024 i/100ms
Post.find(1).name 243 i/100ms
-------------------------------------------------
Post.new 20637.6 (±12.7%) i/s - 102168 in 5.039578s
post.name 1167897.7 (±18.2%) i/s - 5186144 in 4.983077s
post.name= 64305.6 (±9.6%) i/s - 317520 in 4.998720s
Post.find(1).name 2678.8 (±10.8%) i/s - 13365 in 5.051265s
After
-----
Calculating -------------------------------------
Post.new 1431 i/100ms
post.name 7790 i/100ms
post.name= 3181 i/100ms
Post.find(1).name 245 i/100ms
-------------------------------------------------
Post.new 21308.8 (±12.2%) i/s - 105894 in 5.053879s
post.name 1534103.8 (±2.1%) i/s - 7634200 in 4.979405s
post.name= 67441.0 (±7.5%) i/s - 337186 in 5.037871s
Post.find(1).name 2681.9 (±10.6%) i/s - 13475 in 5.084511s
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Coerce strings in create_join_table.
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If you accidentally pass a string and a symbol, this breaks. So
we coerce them both to strings.
Fixes #7715
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Postgresql adapter: fix handling of BC timestamps
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AR::Base.becomes should not change the STI type
Conflicts:
activerecord/CHANGELOG.md
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If you want to change the STI type too, use AR::Base.becomes! instead
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The `ActiveRecord::Fixtures::find_table_name` method was removed from "master" almost a year ago, but it was never deprecated. Here it comes back, more dead than alive.
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Conflicts:
actionpack/lib/action_dispatch/routing/redirection.rb
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