The idea of `class_name` as an option of reflection is that passing a
string would allow us to lazy autoload the class.
Using `belongs_to :client, class_name: Customer` is eagerloading models more than necessary
and creating possible circular dependencies.
- Reference: https://travis-ci.org/rails/rails/jobs/189764676
- Reproduction command:
MTB_VERBOSE=2 bundle exec minitest_bisect --seed 33328 -Itest "test/cases/migration_test.rb" "test/cases/tasks/database_tasks_test.rb"
- You need to also add minitest_bisect gem to the Gemfile to reproduce
this failure.
- #27596 Updated "run" and "migrate" method for returning correct
value but only added test for "migrate" method. This commit adds a
test for "run" as well.
In Rails 4.2 calling `ActiveRecord::Migrator.migrate` would return an array of results. Without realizing that this return type was expected I accidentally introduced a change in 4d60e93174
This PR preserves the previous behavior and adds a test on the return type. This will need a backport to 5.0 branch.
The alternative of #26213.
Currently `find_by` and `where` with AR object return inconsistent
result. This is caused by statement cache does not support AR object.
Passing to finder method to fix the issue.
Fixes#26210.
This reverts commit eeac6151a55cb7d5f799e1ae33aa64a839cbc3aa, reversing
changes made to 5c40239d3104543e70508360d27584a3e4dc5baf.
Reason: Broke the isolated tests.
https://travis-ci.org/rails/rails/builds/188721346
Per the regression commit below, the commit changes the behavior of
`#changed?`to consult the `#changed_in_place?` method on `Type::Value` classes.
Per this change, `PostgreSQL::OID::Hstore` needs to override this method
in order to compare the deserialized forms of the two arguments. In
Ruby, two hashes are considered equal even if their key order is
different. This commit helps to bring that behavior to `Hstore` values.
Fixes regression introduced by 8e633e505880755e7e366ccec2210bbe2b5436e7
Fixes#27502
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.
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
```
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)
```
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.
* 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:
d753645d40/activerecord/test/cases/timestamp_test.rb (L17)
* Expand changelog entry.
Elaborate and show examples.
Closes#26995.
[ Jarred Trost & Kasper Timm Hansen ]
