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In f1a0fa9 we moved backend specific timestamp behavior out of the type
and into the adapter. This was in line with our general attempt to
reduce the number of adapter specific type subclasses. However, on PG,
the array type performs all serialization, including database encoding
in its serialize method.
This means that we have converted the value into a string before
reaching the database, so no adapter specific logic can be applied (and
this also means that timestamp arrays were using the default `.to_s`
method on the given object, which likely meant timestamps were being
ignored in certain cases as well)
Ultimately I want to do a more in depth refactoring which separates
database serializer objects from the active model type objects, to give
us a less awkward API for introducing the attributes API onto Active
Model.
However, in the short term, we follow the solution we've applied
elsewhere for this. Move behavior off of the type and into the adapter,
and use a data object to allow the type to communicate information up
the stack.
Fixes #27514.
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Active Record supports MySQL >= 5.1.10
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Follow up to #25307 and #23458. Related with #27422.
We are using `information_schema.referential_constraints` since #25307.
The table was introduced in MySQL 5.1.10. MySQL 5.0 is too old. It is
enough to support >= 5.1.10 at least.
MySQL 5.0 GA was released in Dec 2005 and already EOL in Dec 2011.
MySQL 5.1 GA was released in Dec 2008 and already EOL in Dec 2013.
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Add missing `emit_warning_if_needed` for `changed?`
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We faced a significant performance decrease when we started using STI
without storing full namespaced class name in type column (because of PostgreSQL
length limit for ENUM types).
We realized that the cause of it is the slow STI model instantiation. Problematic
method appears to be `ActiveRecord::Base.compute_type`, which is used to find
the right class for STI model on every instantiation.
It builds an array of candidate types and then iterates through it calling
`safe_constantize` on every type until it finds appropriate constant. So if
desired type isn't the first element in this array there will be at least one
unsuccessful call to `safe_constantize`, which is very expensive, since it's
defined in terms of `begin; rescue; end`.
This commit is an attempt to speed up `compute_type` method simply by caching
results of previous calls.
```ruby
class MyCompany::MyApp::Business::Accounts::Base < ApplicationRecord
self.table_name = 'accounts'
self.store_full_sti_class = false
end
class MyCompany::MyApp::Business::Accounts::Free < Base
end
class MyCompany::MyApp::Business::Accounts::Standard < Base
# patch .compute_type there
end
puts '======================= .compute_type ======================='
Benchmark.ips do |x|
x.report("original method") do
MyCompany::MyApp::Business::Accounts::Free.send :compute_type, 'Free'
end
x.report("with types cached") do
MyCompany::MyApp::Business::Accounts::Standard.send :compute_type, 'Standard'
end
x.compare!
end
```
```
======================= .compute_type =======================
with types cached: 1529019.4 i/s
original method: 2850.2 i/s - 536.46x slower
```
```ruby
5_000.times do |i|
MyCompany::MyApp::Business::Accounts::Standard.create!(name: "standard_#{i}")
end
5_000.times do |i|
MyCompany::MyApp::Business::Accounts::Free.create!(name: "free_#{i}")
end
puts '====================== .limit(100).to_a ======================='
Benchmark.ips do |x|
x.report("without .compute_type patch") do
MyCompany::MyApp::Business::Accounts::Free.limit(100).to_a
end
x.report("with .compute_type patch") do
MyCompany::MyApp::Business::Accounts::Standard.limit(100).to_a
end
x.compare!
end
```
```
====================== .limit(100).to_a =======================
with .compute_type patch: 360.5 i/s
without .compute_type patch: 24.7 i/s - 14.59x slower
```
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kamipo/fix_update_counters_of_multiple_records_with_touch
Fix update counters of multiple records with touch: true
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`current_time_from_proper_timezone` and timestamp attributes methods was
pushed up to class method.
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to class method
Actually these methods don't need instantiation.
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Currently does not work the following example in the doc:
```ruby
# For the Posts with id of 10 and 15, increment the comment_count by 1
# and update the updated_at value for each counter.
Post.update_counters [10, 15], comment_count: 1, touch: true
# Executes the following SQL:
# UPDATE posts
# SET comment_count = COALESCE(comment_count, 0) + 1,
# `updated_at` = '2016-10-13T09:59:23-05:00'
# WHERE id IN (10, 15)
```
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b8f74860b61782e3b949ade3bb51bff40899e89b provided a nicer version of
`#test_structure_load` but the old version was not removed.
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* Rename update -> touch to remain consistent with the other docs
language of "touch"'ing.
* Remove the sentence that's repeated from just above and rephrase.
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Dump schema cache for custom connection
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Today `rake db:schema:cache:dump` only supports dumping cache for a
single connection (`ActiveRecord::Base.connection`). This doesn't work
for apps with multiple databases.
This PR makes `DatabaseTasks` to provide an API for dumping schema cache
for any connection.
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`touch_updates` calls `Time.now` via `current_time_from_proper_timezone`
so it is better to not invoke `touch_updates` if it is unnecessary.
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* Refactor to use `touch_updates`
Ensures we only call `current_time_from_proper_timezone` from one place.
* Clarify touch default in tests.
Not interested in what happens when passed false but that
nothing passed means no touching.
* Backdate touched columns in tests.
We can't be sure a test progresses through time, so our
touching code may be working correctly but the test
itself is brittle.
Fix by backdating that's further in the past akin to
what the timestamps tests do:
https://github.com/rails/rails/blob/d753645d40e925973724e4c3a8617b654da90e41/activerecord/test/cases/timestamp_test.rb#L17
* Expand changelog entry.
Elaborate and show examples.
Closes #26995.
[ Jarred Trost & Kasper Timm Hansen ]
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As pointed out by @matthewd this change makes ImmutableString aware
of MysqlString's existence whereas previously MysqlString was only
overriding public API.
cc @kamipo
This reverts commit e632c2fa4cb60072a778ce95c952a0fa95e5b074, reversing
changes made to 334a7dcf107cd3ff1697163d331d289d6d65dcd7.
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`timestamp_attributes_for_{create,update}` is defined as symbol but
always used as string with `to_s`. This allocates extra strings. To
avoid extra allocation, change the definitions from symbol to string.
```ruby
pp ObjectSpace::AllocationTracer.trace {
1_000.times { |i|
Post.create!
}
}
```
Before:
```
["~/rails/activerecord/lib/active_record/timestamp.rb", 121]=>[1002, 0, 750, 0, 1, 18528],
["~/rails/activerecord/lib/active_record/timestamp.rb", 105]=>[1002, 0, 750, 0, 1, 7720],
["~/rails/activerecord/lib/active_record/timestamp.rb", 101]=>[1002, 0, 750, 0, 1, 7720],
["~/rails/activerecord/lib/active_record/timestamp.rb", 109]=>[1002, 0, 750, 0, 1, 13896],
["~/rails/activerecord/lib/active_record/timestamp.rb", 61]=>[4008, 0, 3000, 0, 1, 30880],
```
After:
```
["~/rails/activerecord/lib/active_record/timestamp.rb", 120]=>[1000, 0, 756, 0, 1, 17184],
["~/rails/activerecord/lib/active_record/timestamp.rb", 104]=>[1000, 0, 756, 0, 1, 7160],
["~/rails/activerecord/lib/active_record/timestamp.rb", 100]=>[1000, 0, 756, 0, 1, 7160],
["~/rails/activerecord/lib/active_record/timestamp.rb", 108]=>[1000, 0, 756, 0, 1, 12888],
```
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Extract `casted_true`/`casted_false` for `Type::ImmutableString`
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The only difference between `Type::ImmutableString` and its subclasses
is the representation of the casted booleans. Prefer extracting
`casted_true`/`casted_false` and override these by subclasses.
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Simply we can do `target.pluck(reflection.association_primary_key)` if
`target` is loaded.
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Currently schema dumper does not dump array subtype `precision` and
`scale` options. This commit fixes the issue.
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Add a quote to an SQL insert statement of schema migration
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Trim some needless words off the lines and format the code
sample like we'd write in the Rails source.
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Marked as private in 2afe5a1 and doesn't seem worth it
to mention the module name here.
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prathamesh-sonpatki/mark-one-more-constant-as-private
Mark :GeneratedAssociationMethods also as private_constant
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- After https://github.com/rails/rails/commit/64e5b897ac944a05a33275e3828a3d4047a6b457,
only :GeneratedAssociationMethods was remaining to be marked as
private constant, so marked it as well.
- Before:
>> User.constants(false)
=> [:GeneratedAssociationMethods]
- After:
>> User.constants(false)
=> []
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Per https://www.timeanddate.com/counters/firstnewyear.html, it's already
2017 in a lot of places, so we should bump the Rails license years to
2017.
[ci skip]
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[ci skip]
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Closes #14640
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[ci skip]
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provided.
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