Ruby uses the original method name, so will show the __temp__ method
name in the backtrace. However, in the common case the method name
is compatible with the `def` keyword, so we can avoid the __temp__
method name in that case to improve the name shown in backtraces
or TracePoint#method_id.
Since Rails 6.0 will support Ruby 2.4.1 or higher
`# frozen_string_literal: true` magic comment is enough to make string object frozen.
This magic comment is enabled by `Style/FrozenStringLiteralComment` cop.
* Exclude these files not to auto correct false positive `Regexp#freeze`
- 'actionpack/lib/action_dispatch/journey/router/utils.rb'
- 'activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb'
It has been fixed by https://github.com/rubocop-hq/rubocop/pull/6333
Once the newer version of RuboCop released and available at Code Climate these exclude entries should be removed.
* Replace `String#freeze` with `String#-@` manually if explicit frozen string objects are required
- 'actionpack/test/controller/test_case_test.rb'
- 'activemodel/test/cases/type/string_test.rb'
- 'activesupport/lib/active_support/core_ext/string/strip.rb'
- 'activesupport/test/core_ext/string_ext_test.rb'
- 'railties/test/generators/actions_test.rb'
For example, dirty checking was not right for the following case:
```
model.int_column = "+5"
model.float_column = "0.5E+1"
model.decimal_column = "0.5e-3"
```
It is enough to see whether leading character is a digit for avoiding
invalid numeric expression like 'wibble' to be type-casted to 0, as
this method's comment says.
Fixes#33801
The multiplication of the value takes a long time when we can instead mutate and use the string value directly.
The `microsec` perf increases speed by 27% in the ideal case (which is the most common).
```
original_string = ".443959"
require 'benchmark/ips'
Benchmark.ips do |x|
x.report("multiply") {
string = original_string.dup
(string.to_r * 1_000_000).to_i
}
x.report("new ") {
string = original_string.dup
if string && string.start_with?(".".freeze) && string.length == 7
string[0] = ''.freeze
string.to_i
end
}
x.compare!
end
# Warming up --------------------------------------
# multiply 125.783k i/100ms
# new 146.543k i/100ms
# Calculating -------------------------------------
# multiply 1.751M (± 3.3%) i/s - 8.805M in 5.033779s
# new 2.225M (± 2.1%) i/s - 11.137M in 5.007110s
# Comparison:
# new : 2225289.7 i/s
# multiply: 1751254.2 i/s - 1.27x slower
```
The purpose of fe9547b is to work type casting to value from database.
But that was caused not to use the value before type cast even except
Active Record.
There we never guarantees that the value before type cast was going to
the used in this validation, but we should not change the behavior
unless there is some particular reason.
To restore original behavior, still use the value before type cast if
`came_from_user?` is undefined (i.e. except Active Record).
Fixes#33651.
Fixes#33686.
Since fe9547b6, numericality validator would parse raw value only when a
value came from user to work type casting to a value from database.
But that was caused a regression that the validator would work against
getter value instead of parsed raw value, a getter is sometimes
customized by people. #33550
There we never guarantees that the value before type cast was going to
the used in this validation (actually here is only place that getter
value might not be used), but we should not change the behavior unless
there is some particular reason.
The purpose of fe9547b6 is to work type casting to a value from
database. We could achieve the purpose by using `read_attribute`,
without using getter value.
Fixes#33550.
Use attr_reader/attr_writer instead of methods
method is 12% slower
Use flat_map over map.flatten(1)
flatten is 66% slower
Use hash[]= instead of hash.merge! with single arguments
merge! is 166% slower
See https://github.com/rails/rails/pull/32337 for more conversation
This ends up adding it to all save-related callbacks defined in `ActiveRecord::DefineCallbacks`, including e.g. `after_create`. Which should be fine: they didn't support `:on` in the first place.
- Ensure that execution of `authenticate`/`authenticate_XXX` returns
`self` if password is correct, otherwise `false` (as mentioned in the documentation).
- Test `authenticate_password`.
See 136fc65c9b (r28897107)
I _think_ that this method can now be rewritten from:
```ruby
def attribute_previous_change(attr)
previous_changes[attr] if attribute_previously_changed?(attr)
end
```
to:
```ruby
def attribute_previous_change(attr)
previous_changes[attr]
end
```
without losing performance.
---
Calling
```ruby
previous_changes[attr] if attribute_previously_changed?(attr)
```
is equivalent to calling
```ruby
previous_changes[attr] if previous_changes.include?(attr)
```
When this commit 136fc65c9b was made, Active Record had its own `previous_changes` method, added here below. However, that method has been recently removed from the codebase, so `previous_changes` is now only the method defined in Active Model as:
```ruby
def previous_changes
@previously_changed ||= ActiveSupport::HashWithIndifferentAccess.new
@previously_changed.merge(mutations_before_last_save.changes)
end
```
Since we are dealing with a memoized Hash, there is probably no need to check `if .include?(attr_name)` before trying to fetch `[attr]` for it.
Does that make sense? Did I miss anything? Thanks!
When requesting columns names from database adapters AR:Result
would dup/freeze column names, this prefers using fstrings which
cuts down on repeat allocations
Attributes that are retained keep these fstrings around for the long
term
Note, this has the highest impact on "short" result sets, eg: Topic.first where you can void allocating the number of columns * String.
`QueryAttribute#value_for_database` calls only `type.serialize`, and
`Boolean#serialize` is a no-op unlike other attribute types.
It caused the issue #32624. Whether or not `serialize` will invoke
`cast` is undefined in our test cases, but it actually does not work
properly unless it does so for now.
Fixes#32624.
Since `parse_raw_value_as_a_number` may not always parse raw value from
database as a number without type casting (e.g. "$150.55" as money
format).
Fixes#32531.
Since #26074, introduced force equality checking to build a predicate
consistently for both `find` and `create` (fixes#27313).
But the assumption that only array/range attribute have subtype was
wrong. We need to make force equality checking more strictly not to
allow serialized attribute.
Fixes#32761.
When an array of hashes is added to a `HashWithIndifferentAccess`, the
hashes are replaced with HWIAs by mutating the array in place.
If an attribute's value is an array of hashes, `changes_to_save` will
convert it to an array of HWIAs as a side-effect of adding it to the
changes hash.
Using `merge!` instead of `[]=` fixes the problem, as `merge!` copies
any array values in the provided hash instead of mutating them.
