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callbacks
We pretty frequently get bug reports that "dirty is broken inside of
after callbacks". Intuitively they are correct. You'd expect
`Model.after_save { puts changed? }; model.save` to do the same thing as
`model.save; puts model.changed?`, but it does not.
However, changing this goes much farther than just making the behavior
more intuitive. There are a _ton_ of places inside of AR that can be
drastically simplified with this change. Specifically, autosave
associations, timestamps, touch, counter cache, and just about anything
else in AR that works with callbacks have code to try to avoid "double
save" bugs which we will be able to flat out remove with this change.
We introduce two new sets of methods, both with names that are meant to
be more explicit than dirty. The first set maintains the old behavior,
and their names are meant to center that they are about changes that
occurred during the save that just happened. They are equivalent to
`previous_changes` when called outside of after callbacks, or once the
deprecation cycle moves.
The second set is the new behavior. Their names imply that they are
talking about changes from the database representation. The fact that
this is what we really care about became clear when looking at
`BelongsTo.touch_record` when tests were failing. I'm unsure that this
set of methods should be in the public API. Outside of after callbacks,
they are equivalent to the existing methods on dirty.
Dirty itself is not deprecated, nor are the methods inside of it. They
will only emit the warning when called inside of after callbacks. The
scope of this breakage is pretty large, but the migration path is
simple. Given how much this can improve our codebase, and considering
that it makes our API more intuitive, I think it's worth doing.
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assert [1, 3].includes?(2) fails with unhelpful "Asserting failed" message
assert_includes [1, 3], 2 fails with "Expected [1, 3] to include 2" which makes it easier to debug and more obvious what went wrong
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Style/SpaceBeforeBlockBraces
Style/SpaceInsideBlockBraces
Style/SpaceInsideHashLiteralBraces
Fix all violations in the repository.
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The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.
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Where appropriatei, prefer the more concise Regexp#match?,
String#include?, String#start_with?, or String#end_with?
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This code was added in 81286f858770e0b95e15af37f19156b044ec6a95, but was
not used by that commit and does not appear to have ever been used.
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As part of refactoring mutation detection to be more performant, we
introduced the concept of `original_value` to `Attribute`. This was not
overridden in `Attribute::Uninitialized` however, so assigning ot an
uninitialized value and calling `.changed?` would raise
`NotImplementedError`.
We are using a sentinel value rather than checking the result of
`original_attribute.initialized?` in `changed?` because `original_value`
might go through more than one node in the tree.
Fixes #25228
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This was passing prior to 20b177b78ef5d21c8cc255f0376f6b2e948de234,
because we were not properly applying our contract that
`model.attr == model.tap(&:save).reload.attr` for this case. Now that
that has been resolved, this test is invalid on some adapters
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They didn't help.
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Nobody can replicate locally and the failure makes no sense
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When I originally reviewed the #20317, I believe these changes were
present, but it appears that it was later updated so that they were
removed. Since Travis hadn't re-run the build, this slipped through.
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If a getter has side effects on the DB, `changes_applied` will be called
twice. The second time will try and remove the changed attributes cache,
and will crash because it's already been unset. This also demonstrates
that we shouldn't assume that calling getters won't change the value of
`changed_attributes`, and we need to clear the cache if an attribute is
modified.
Fixes #20531.
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This is a usability change to fix a quirk from our definition of partial
writes. By default, we only persist changed attributes. When creating a
new record, this is assumed that the default values came from the
database. However, if the user provided a default, it will not be
persisted, since we didn't see it as "changed". Since this is a very
specific case, I wanted to isolate it with the other quirks that come
from user provided default values. The number of edge cases which are
presenting themselves are starting to make me wonder if we should just
remove the ability to assign a default, in favor of overriding
`initialize`. For the time being, this is required for the attributes
API to not have confusing behavior.
We had to delete one test, since this actually changes the meaning of
`.changed?` on Active Record models. It now specifically means
`changed_from_database?`. While I think this will make the attributes
API more ergonomic to use, it is a subtle change in definition (though
not a backwards incompatible one). We should probably figure out the
right place to document this. (Feel free to open a PR doing that if
you're reading this).
/cc @rafaelfranca @kirs @senny
This is an alternate implementation of #19921.
Close #19921.
[Sean Griffin & Kir Shatrov]
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This helper no longer makes sense as a separate method. Instead I'll
just have `deserialize` call `cast` by default. This led to a random
infinite loop in the `JSON` pg type, when it called `super` from
`deserialize`. Not really a great way to fix that other than not calling
super, or continuing to have the separate method, which makes the public
API differ from what we say it is.
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The same is not true of `define_attribute`, which is meant to be the low
level no-magic API that sits underneath. The differences between the two
APIs are:
- `attribute`
- Lazy (the attribute will be defined after the schema has loaded)
- Allows either a type object or a symbol
- `define_attribute`
- Runs immediately (might get trampled by schema loading)
- Requires a type object
This was the last blocker in terms of public interface requirements
originally discussed for this feature back in May. All the
implementation blockers have been cleared, so this feature is probably
ready for release (pending one more look-over by me).
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When an attribute is assigned, we determine if it was already marked as
changed so we can determine if we need to clear the changes, or mark it
as changed. Since this only affects the `attributes_changed_by_setter`
hash, in-place changes are irrelevant to this process. Since calculating
in-place changes can be expensive, we can just skip it here.
I also added a test for the only edge case I could think of that would
be affected by this change.
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This sets a precident for how we handle `attribute` calls, which aren't
backed by a database column. We should not take this as a conscious
decision on how to handle them, and this can change when we make
`attribute` public if we have better ideas in the future.
As the composed attributes API gets fleshed out, I expect the
`persistable_attributes` method to change to
`@attributes.select(&:persistable).keys`, or some more performant
variant there-of. This can probably go away completely once we fully
move dirty checking into the attribute objects once it gets moved up to
Active Model.
Fixes #18407
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`ActiveModel::Dirty#reset_changes`.
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This showed up when running BinaryTest#test_load_save with the more
restrictive input string handling of pg-0.18.0.pre20141117110243.gem .
Bytea values sent to the server are in binary format, but are
returned back as escaped text. To fulfill the assumption that
type_cast_from_database(type_cast_for_database(binary)) == binary
we unescape only, if the value was really received from the server.
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Calling `changed_attributes` will ultimately check if every mutable
attribute has changed in place. Since this gets called whenever an
attribute is assigned, it's extremely slow. Instead, we can avoid this
calculation until we actually need it.
Fixes #18029
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This test would fail when executed after any test that calls fixtures(:binaries)
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Fixes #16701
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These methods may cause confusion with the `reset_changes` that
behaves differently
of them.
Also rename undo_changes to restore_changes to match this new set of
methods.
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We have several mutable types on Active Record now. (Serialized, JSON,
HStore). We need to be able to detect if these have been modified in
place.
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- The following is now true for all types, all the time
- `model.attribute_before_type_cast == given_value`
- `model.attribute == model.save_and_reload.attribute`
- `model.attribute == model.dup.attribute`
- `model.attribute == YAML.load(YAML.dump(model)).attribute`
- Removes the remaining types implementing `type_cast_for_write`
- Simplifies the implementation of time zone aware attributes
- Brings tz aware attributes closer to being implemented as an attribute
decorator
- Adds additional point of control for custom types
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For consistency with https://github.com/rails/rails/pull/15557
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The contract of `_field_changed?` assumes that the old value is always
type cast. That is not the case for the value in `Column#default` as
things are today. It appears there are other public methods that
assume that `Column#default` is type cast, as well. The reason for this
change originally was because the value gets put into `@raw_attributes`
in initialize. This reverts to the old behavior on `Column`, and updates
`initialize` to make sure that the values are in the right format.
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Removed deprecated methods `partial_updates`, `partial_updates?` and
`partial_updates=`
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Previously, when `time_zone_aware_attributes` were enabled, after
changing a datetime or timestamp attribute and then changing it back
to the original value, `changed_attributes` still tracked the
attribute as changed. This caused `[attribute]_changed?` and
`changed?` methods to return true incorrectly.
Example:
in_time_zone 'Paris' do
order = Order.new
original_time = Time.local(2012, 10, 10)
order.shipped_at = original_time
order.save
order.changed? # => false
# changing value
order.shipped_at = Time.local(2013, 1, 1)
order.changed? # => true
# reverting to original value
order.shipped_at = original_time
order.changed? # => false, used to return true
end
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This reverts commit e9d2ad395ec2ef929d74752f3d71c80674044fbe.
Closes #8460
Conflicts:
activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb
activerecord/test/cases/dirty_test.rb
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Add a test case to ensure that fractional second updates are detected.
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This reverts commit 637a7d9d357a0f3f725b0548282ca8c5e7d4af4a, reversing
changes made to 5937bd02dee112646469848d7fe8a8bfcef5b4c1.
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They was extracted from a plugin.
See https://github.com/rails/rails-observers
[Rafael Mendonça França + Steve Klabnik]
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Setting a nil datetime attribute to a blank string should not cause the
attribute to be dirty.
Fix #8310
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