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Require explicit counter_cache option for has_many
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Previously has_many associations assumed a counter_cache was to be used
based on the presence of an appropriately named column. This is
inconsistent, since the inverse belongs_to association will not make
this assumption. See issues #19042 #8446.
This commit checks for the presence of the counter_cache key in the
options of either the has_many or belongs_to association as well as
ensuring that the *_count column is present.
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Prevent duplicating `where` clauses
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class
Fixes #19528
fix for mysql2 test
better test
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Closes #21201.
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If the through class has default scopes we should skip the statement
cache.
Closes #20745.
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[ci skip] Fix rdoc markup
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`+` doesn't work around content with spaces fallback `<tt>`.
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[ci skip] Fix the indentation
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Add method to run command-line db apps
Conflicts:
activerecord/CHANGELOG.md
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- Added run_cmd() class method to dry up Kernel.system() messages within
this namespace and avoid shell expansion by passing a list of
arguments instead of a string
- Update structure_dump, structure_load, and related tests units to
pass a list of params instead of using a string to
avoid shell expansion
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use correct DB connection for generated HABTM table
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This includes the following classes:
- ActiveModel::Serializers::Xml
- ActiveRecord::Serialization::XmlSerializer
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`in_batches` yields Relation objects if a block is given, otherwise it
returns an instance of `BatchEnumerator`. The existing `find_each` and
`find_in_batches` methods work with batches of records. The new API
allows working with relation batches as well.
Examples:
Person.in_batches.each_record(&:party_all_night!)
Person.in_batches.update_all(awesome: true)
Person.in_batches.delete_all
Person.in_batches.map do |relation|
relation.delete_all
sleep 10 # Throttles the delete queries
end
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Use memoization for collection associations ids reader
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Fixes #21082
remove extra space
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Because `info[:version]` is a client version, the server version is
`server_info[:version]`.
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PostgreSQL is strict about the usage of `DISTINCT` and `ORDER BY`, which
one of the tests demonstrated. The order clause is never going to be
relevant in the query we're performing, so let's just remove it
entirely.
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Add #cache_key to ActiveRecord::Relation.
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When a symbol is passed in, we call `to_s` on it which allocates a string. The two hardcoded symbols that are used internally are `:to_partial_path` and `:to_model`.
This change buys us 71,136 bytes of memory and 1,777 fewer objects per request.
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Fix misleading errors for has_one through relations
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This is an alternate implementation of #20966.
[Sean Griffin & presskey]
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Deep down in the association internals, we're calling `destroy!` rather
than `destroy` when handling things like `dependent` or autosave
association callbacks. Unfortunately, due to the structure of the code
(e.g. it uses callbacks for everything), it's nearly impossible to pass
whether to call `destroy` or `destroy!` down to where we actually need
it.
As such, we have to do some legwork to handle this. Since the callbacks
are what actually raise the exception, we need to rescue it in
`ActiveRecord::Callbacks`, rather than `ActiveRecord::Persistence` where
it matters. (As an aside, if this code wasn't so callback heavy, it
would handling this would likely be as simple as changing `destroy` to
call `destroy!` instead of the other way around).
Since we don't want to lose the exception when `destroy!` is called (in
particular, we don't want the value of the `record` field to change to
the parent class), we have to do some additional legwork to hold onto it
where we can use it.
Again, all of this is ugly and there is definitely a better way to do
this. However, barring a much more significant re-architecting for what
I consider to be a reletively minor improvement, I'm willing to take
this small hit to the flow of this code (begrudgingly).
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The note regarding the `_prefix` and `_suffix` options is no longer
useful since they were renamed specifically for this purpose.
Also the given example doesn't show what these options enable and in
which case they are really useful (when there are conflicting values
for instance).
Refs #20999.
[Godfrey Chan & Robin Dupret]
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This makes it more clear that they are reserved keywords and also it
seems less redundant as the line already starts with the call to the
`enum` method.
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Documentation had extra colon after keyword.
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ActiveRecord::RecordNotFound modified to store model name, primary_key
and id of the caller model. It allows the catcher of this exception to make
a better decision to what to do with it. For example consider this simple
example:
class SomeAbstractController < ActionController::Base
rescue_from ActiveRecord::RecordNotFound, with: :redirect_to_404
private def redirect_to_404(e)
return redirect_to(posts_url) if e.model == 'Post'
raise
end
end
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Previously `has_one` and `has_many` associations were using the
`one` and `many` keys respectively. Both of these keys have special
meaning in I18n (they are considered to be pluralizations) so by
renaming them to `has_one` and `has_many` we make the messages more
explicit and most importantly they don't clash with linguistical
systems that need to validate translation keys (and their
pluralizations).
The `:'restrict_dependent_destroy.one'` key should be replaced with
`:'restrict_dependent_destroy.has_one'`, and
`:'restrict_dependent_destroy.many'` with
`:'restrict_dependent_destroy.has_many'`.
[Roque Pinel & Christopher Dell]
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support it. Fixes #19711
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This clears the transaction record state when the transaction finishes
with a `:committed` status.
Considering the following example where `name` is a required attribute.
Before we had `new_record?` returning `true` for a persisted record:
```ruby
author = Author.create! name: 'foo'
author.name = nil
author.save # => false
author.new_record? # => true
```
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As per the docs, `mark_for_destruction` should do nothing if `autosave`
is not set to true. We normally persist associations on a record no
matter what if the record is a new record, but we were always skipping
records which were `marked_for_destruction?`.
Fixes #20882
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Add missing method name to exception description
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Freeze string literals when not mutated.
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I wrote a utility that helps find areas where you could optimize your program using a frozen string instead of a string literal, it's called [let_it_go](https://github.com/schneems/let_it_go). After going through the output and adding `.freeze` I was able to eliminate the creation of 1,114 string objects on EVERY request to [codetriage](codetriage.com). How does this impact execution?
To look at memory:
```ruby
require 'get_process_mem'
mem = GetProcessMem.new
GC.start
GC.disable
1_114.times { " " }
before = mem.mb
after = mem.mb
GC.enable
puts "Diff: #{after - before} mb"
```
Creating 1,114 string objects results in `Diff: 0.03125 mb` of RAM allocated on every request. Or 1mb every 32 requests.
To look at raw speed:
```ruby
require 'benchmark/ips'
number_of_objects_reduced = 1_114
Benchmark.ips do |x|
x.report("freeze") { number_of_objects_reduced.times { " ".freeze } }
x.report("no-freeze") { number_of_objects_reduced.times { " " } }
end
```
We get the results
```
Calculating -------------------------------------
freeze 1.428k i/100ms
no-freeze 609.000 i/100ms
-------------------------------------------------
freeze 14.363k (± 8.5%) i/s - 71.400k
no-freeze 6.084k (± 8.1%) i/s - 30.450k
```
Now we can do some maths:
```ruby
ips = 6_226k # iterations / 1 second
call_time_before = 1.0 / ips # seconds per iteration
ips = 15_254 # iterations / 1 second
call_time_after = 1.0 / ips # seconds per iteration
diff = call_time_before - call_time_after
number_of_objects_reduced * diff * 100
# => 0.4530373333993266 miliseconds saved per request
```
So we're shaving off 1 second of execution time for every 220 requests.
Is this going to be an insane speed boost to any Rails app: nope. Should we merge it: yep.
p.s. If you know of a method call that doesn't modify a string input such as [String#gsub](https://github.com/schneems/let_it_go/blob/b0e2da69f0cca87ab581022baa43291cdf48638c/lib/let_it_go/core_ext/string.rb#L37) please [give me a pull request to the appropriate file](https://github.com/schneems/let_it_go/blob/b0e2da69f0cca87ab581022baa43291cdf48638c/lib/let_it_go/core_ext/string.rb#L37), or open an issue in LetItGo so we can track and freeze more strings.
Keep those strings Frozen
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Also removes a false positive test that depends on the fixed bug:
At this time, counter_cache does not work with polymorphic relationships
(which is a bug). The test was added to make sure that no
StaleObjectError is raised when the car is destroyed. No such error is
currently raised because the lock version is not incremented by
appending a wheel to the car.
Furthermore, `assert_difference` succeeds because `car.wheels.count`
does not check the counter cache, but the collection size. The test will
fail if it is replaced with `car.wheels_count || 0`.
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[ci skip] Fix typo in #any? RDoc
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