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MySQL generated columns: https://dev.mysql.com/doc/refman/5.7/en/create-table-generated-columns.html
MariaDB virtual columns: https://mariadb.com/kb/en/mariadb/virtual-computed-columns/
Declare virtual columns with `t.virtual name, type: …, as: "expression"`.
Pass `stored: true` to persist the generated value (false by default).
Example:
create_table :generated_columns do |t|
t.string :name
t.virtual :upper_name, type: :string, as: "UPPER(name)"
t.virtual :name_length, type: :integer, as: "LENGTH(name)", stored: true
t.index :name_length # May be indexed, too!
end
Closes #22589
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`initialize_internal_metadata_table`
These internal initialize methods are no longer used internally.
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This reverts commit 39c77eb1843f79925c7195e8869afc7cb7323682, reversing
changes made to 9f6f51be78f8807e18fc6562c57af2fdbf8ccb56.
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`initialize_internal_metadata_table` internal public methods
These internal methods accidentally appeared in the doc, and so almost
useless. It is enough to create these internal tables directly, and
indeed do so in several places.
https://github.com/rails/rails/blob/v5.0.1/activerecord/lib/active_record/schema.rb#L55
https://github.com/rails/rails/blob/v5.0.1/activerecord/lib/active_record/railties/databases.rake#L6
https://github.com/rails/rails/blob/v5.0.1/activerecord/lib/active_record/tasks/database_tasks.rb#L230
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Supports the `touch` option from update_counters.
The default behavior is not to update timestamp columns.
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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.
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https://github.com/rails/rails/issues/26834
This change raises an error if a has_many through association
is defined before the through association.
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Deprecate passing `name` to `indexes` like `tables`
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Passing `name` to `tables` is already deprecated at #21601.
Passing `name` to `indexes` is also unused.
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Rephrase entry with better sounding English.
[ci skip]
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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
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find and exists?
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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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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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* 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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[ci skip]
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[ci skip]
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provided.
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[ *Kasper Timm Hansen* & *Kir Shatrov* ]
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[ci skip]
- add period where necessary
- add backticks where necessary
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make sql statements frozen
dup if arel is not our string
expect runtime error
dont wrap runtime error in invalid
log errors will now be treated as runtime errors
update changelog
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[ci skip]
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