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This reverts commit eec3e28a1abf75676dcee58308ee5721bb53c325, reversing
changes made to 5588fb4802328a2183f4a55c36d6703ee435f85c.
Reason: Marking as loaded without actual loading is too greedy optimization.
See more context #35239.
Closes #35239.
[Edouard CHIN & Ryuta Kamizono]
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Fixed the CI failure https://travis-ci.org/rails/rails/jobs/492291248#L1185-L1191.
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Currently custom attributes are always qualified by the table name in
the generated SQL wrongly even if the table doesn't have the named
column, it would cause an invalid SQL error.
Custom attributes should only be qualified if the table has the same
named column.
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The implicit delegation in the migration class is to be logged. It is
not intended in the migration compatibility, so it should be avoided.
Fixes #35224.
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Clarify collection proxy docs
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The docs for `ActiveRecord::Associations::CollectionProxy` describe
`ActiveRecord::Associations::Association`. I've moved them to
association and rewrote collection proxy's docs to be more applicable to
what the class actually does.`
[ci skip]
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I implemented Foreign key create in `create_table` for SQLite3 at
#24743. This follows #24743 to implement `add_foreign_key` and
`remove_foreign_key`.
Unfortunately SQLite3 has one limitation that
`PRAGMA foreign_key_list(table-name)` doesn't have constraint name.
So we couldn't implement find/remove foreign key by name for now.
Fixes #35207.
Closes #31343.
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Do not allow to add column without column name
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It makes to ease to handle all short-hand methods (e.g. validates
arguments etc).
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`Association#target=` invokes `loaded!`, so we no longer need to call
the `loaded!` explicitly.
Since Preloader is private API, we don't guarantee that it behaves like
older version as long as using Preloader directly. But this refactoring
fortunately also fix the Preloader compatibility issue #35195.
Closes #35195.
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Fix elapsed time calculations
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I've found a few places in Rails code base where I think it makes sense
to calculate elapsed time more precisely by using
`Concurrent.monotonic_time`:
- Fix calculation of elapsed time in `ActiveSupport::Cache::MemoryStore#prune`
- Fix calculation of elapsed time in
`ActiveRecord::ConnectionAdapters::ConnectionPool::Queue#wait_poll`
- Fix calculation of elapsed time in
`ActiveRecord::ConnectionAdapters::ConnectionPool#attempt_to_checkout_all_existing_connections`
- Fix calculation of elapsed time in `ActiveRecord::ConnectionAdapters::Mysql2Adapter#explain`
See
https://docs.ruby-lang.org/en/2.5.0/Process.html#method-c-clock_gettime
https://blog.dnsimple.com/2018/03/elapsed-time-with-ruby-the-right-way
Related to 7c4542146f0dde962205e5a90839349631ae60fb
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Fix `relation.exists?` with giving both `distinct` and `offset`
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The `distinct` affects (reduces) rows of the result, so it is important
part when both `distinct` and `offset` are given.
Replacing SELECT clause to `1 AS one` and removing `distinct` and
`order` is just optimization for the `exists?`, we should not apply the
optimization for that case.
Fixes #35191.
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Bugfix has_many association #size when ids reader is cached and assoc…
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is changed
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Relation is not best place to do this.
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Improve naming in DatabaseSelector
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We're already in the resolver, we call this class "operations" in the
middleware, so we should use the same naming here.
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This is more consistent with Resolver, which has build called. This
allows using a Proc instead of a class, which could be nice if you need
to vary switching logic based on the request in a more ad-hoc way (ie.
check if it is an API request).
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callbacks
`relation.create` populates scope attributes to new record by `scoping`,
it is necessary to assign the scope attributes to the record and to find
STI subclass from the scope attributes.
But the effect of `scoping` is class global, it was caused undesired
behavior that pollute all class level querying methods in initialization
block and callbacks (`after_initialize`, `before_validation`,
`before_save`, etc), which are user provided code.
To avoid the leaking scope issue, restore the original current scope
before initialization block and callbacks are invoked.
Fixes #9894.
Fixes #17577.
Closes #31526.
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Don't use `false` as special value to skip to find inherited scope, we
could use `skip_inherited_scope = true`, and move `_scoping` back on
Relation.
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Formerly it was returning arguments (`records` array).
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Speed up partial rendering by caching "variable" calculation
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This commit speeds up rendering partials by caching the variable name
calculation on the template. The variable name is based on the "virtual
path" used for looking up the template. The same virtual path
information lives on the template, so we can just ask the cached
template object for the variable.
This benchmark takes a couple files, so I'll cat them below:
```
[aaron@TC ~/g/r/actionview (speed-up-partials)]$ cat render_benchmark.rb
require "benchmark/ips"
require "action_view"
require "action_pack"
require "action_controller"
class TestController < ActionController::Base
end
TestController.view_paths = [File.expand_path("test/benchmarks")]
controller_view = TestController.new.view_context
result = Benchmark.ips do |x|
x.report("render") do
controller_view.render("many_partials")
end
end
[aaron@TC ~/g/r/actionview (speed-up-partials)]$ cat test/benchmarks/test/_many_partials.html.erb
Looping:
<ul>
<% 100.times do |i| %>
<%= render partial: "list_item", locals: { i: i } %>
<% end %>
</ul>
[aaron@TC ~/g/r/actionview (speed-up-partials)]$ cat test/benchmarks/test/_list_item.html.erb
<li>Number: <%= i %></li>
```
Benchmark results (master):
```
[aaron@TC ~/g/r/actionview (master)]$ be ruby render_benchmark.rb
Warming up --------------------------------------
render 41.000 i/100ms
Calculating -------------------------------------
render 424.269 (± 3.5%) i/s - 2.132k in 5.031455s
```
Benchmark results (this branch):
```
[aaron@TC ~/g/r/actionview (speed-up-partials)]$ be ruby render_benchmark.rb
Warming up --------------------------------------
render 50.000 i/100ms
Calculating -------------------------------------
render 521.862 (± 3.8%) i/s - 2.650k in 5.085885s
```
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This follows up d97980a16d76ad190042b4d8578109714e9c53d0.
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Active Record uses `scoping` to delegate to named scopes from relations
for propagating the chaining source scope. It was needed to restore the
source scope in named scopes, but it was caused undesired behavior that
pollute all class level querying methods.
Example:
```ruby
class Topic < ActiveRecord::Base
scope :toplevel, -> { where(parent_id: nil) }
scope :children, -> { where.not(parent_id: nil) }
scope :has_children, -> { where(id: Topic.children.select(:parent_id)) }
end
# Works as expected.
Topic.toplevel.where(id: Topic.children.select(:parent_id))
# Doesn't work due to leaking `toplevel` to `Topic.children`.
Topic.toplevel.has_children
```
Since #29301, the receiver in named scopes has changed from the model
class to the chaining source scope, so the polluting class level
querying methods is no longer required for that purpose.
Fixes #14003.
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Bugfix association loading behavior when counter cache is zero
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Relax sqlite3 version dependency
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With this benchmark:
require "bundler/setup"
require "active_record"
require "benchmark/ips"
# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Schema.define do
create_table :posts, force: true do |t|
end
end
class Post < ActiveRecord::Base
end
new_post = Post.new
Benchmark.ips do |b|
b.report("present?") do
new_post.present?
end
b.report("blank?") do
new_post.blank?
end
end
Before:
Warming up --------------------------------------
present? 52.147k i/100ms
blank? 53.077k i/100ms
Calculating -------------------------------------
present? 580.184k (±21.8%) i/s - 2.555M in 5.427085s
blank? 601.537k (± 9.2%) i/s - 2.972M in 5.003503s
After:
Warming up --------------------------------------
present? 378.235k i/100ms
blank? 375.476k i/100ms
Calculating -------------------------------------
present? 17.381M (± 7.5%) i/s - 86.238M in 5.001815s
blank? 17.877M (± 6.4%) i/s - 88.988M in 5.004634s
This improvement is mostly because those methods were hitting
`method_missing` on a lot of levels to be able to return the value.
To avoid all this stack walking we are short-circuiting those methods.
Closes #35059.
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eileencodes/fix-query-cache-for-database-switching
Invalidate all query caches for current thread
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This change ensures that all query cahces are cleared across all
connections per handler for the current thread so if you write on one
connection the read will have the query cache cleared.
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eileencodes/allow-application-to-change-handler-names
Add ability to change the names of the default handlers
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When I wrote the `connected_to` and `connects_to` API's I wrote them
with the idea in mind that it didn't really matter what the
handlers/roles were called as long as those connecting to the roles knew
which one wrote and which one read.
With the introduction of the middleware Rails begins to assume it's
`writing` and `reading` and there's no room for other roles. At GitHub
we've been using this method for a long time so we have a ton of legacy
code that uses different handler names `default` and `readonly`. We
could rename all our code but I think this is better for a few reasons:
- Legacy apps that have been using multiple databases for a long time
can have an eaiser time switching.
- If we later find this to cause more issues than it's worth we can
easily deprecate.
- We won't force old apps to rewrite the resolver middleware just to use
a different handler.
Adding the writing_role/reading_role required that I move the code that
creates the first handler for writing to the railtie. If I didn't move
this the core class would assign the handler before I was able to assign
a new one in my configuration and I'd end up with 3 handlers instead of
2.
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Hint at advanced options for foreign_key
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We sometimes display simple examples of additional parameters that can be
supplied to table-wise methods like these and I found it particularly difficult
to figure out which options `t.foreign_key` accepts without drilling very deep
into the specific SchemaStatements docs.
Since it's relatively common to create foreign keys with custom column names or
primary keys, it seems like this should help quite a few people.
[ci skip]
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Refactor options for database selector middleware
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Right now we only have one option that's supported, the delay. However I
can see us supporting other options in the future.
This PR refactors the options to get passed into the resolver so whether
you're using middleware or using the config options you can pass options
to the resolver. This will also make it easy to add new options in the
future.
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Eagerly materialize the fixtures transaction
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The transaction used to restore fixtures is an implementation detail
that should be abstracted away. Idealy a test should behave the same
wether or not transactional fixtures are enabled.
However since transactions have been made lazy, the fixture
transaction started leaking into tests case. e.g. consider the
following (oversimplified) test:
```ruby
class SQLSubscriber
attr_accessor :sql
def initialize
@sql = []
end
def call(*, event)
sql << event[:sql]
end
end
subscriber = SQLSubscriber.new
ActiveSupport::Notifications.subscribe("sql.active_record", subscriber)
User.connection.execute('SELECT 1', 'Generic name')
assert_equal ['SELECT 1'], subscriber.sql
```
On Rails 6 it starts to break because the `sql` array will be `['BEGIN', 'SELECT 1']`.
Several things are wrong here:
- That transaction is not generated by the tested code, so it shouldn't be visible.
- The transaction is not even closed yet, which again doesn't reflect the reality.
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Fix has_many through association creation
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This reverts commit ed1eda271c7ac82ecb7bd94b6fa1b0093e648a3e, reversing
changes made to 3d2caab7dc92a13d4dd369678d5b4ce659df8e52.
Reason: 7c3da6e0030aa080fcb89af58b094ed50d861a44
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