| Commit message (Collapse) | Author | Age | Files | Lines |
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This reverts commit 9bf1a0db4acbbf9e8e6f707250269185224e7efe, reversing
changes made to fed97091b9546d369a240d10b184793d49247dd3.
Conflicts:
activerecord/test/cases/transaction_callbacks_test.rb
Reason: This fix introduces another issue described at #8937, so we are
reverting it to restore the behavior of 3-2-stable.
We will fix both issues when we come out with a better solution
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http://www.sqlite.org/lang_savepoint.html
https://github.com/rails/rails/blob/master/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb#L130-L132
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Closes #988.
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fixes #5802
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during a"
This reverts commit c24c885209ac2334dc6f798c394a821ee270bec6.
Here's the explanation I just sent to @tenderlove:
Hey,
I've been thinking about about the transaction memory leak thing that we
were discussing.
Example code:
post = nil
Post.transaction do
N.times { post = Post.create }
end
Post.transaction is going to create a real transaction and there will
also be a (savepoint) transaction inside each Post.create.
In an idea world, we'd like all but the last Post instance to be GC'd,
and for the last Post instance to receive its after_commit callback when
Post.transaction returns.
I can't see how this can work using your solution where the Post itself
holds a reference to the transaction it is in; when Post.transaction
returns, control does not switch to any of Post's instance methods, so
it can't trigger the callbacks itself.
What we really want is for the transaction itself to hold weak
references to the objects within the transaction. So those objects can
be GC'd, but if they are not GC'd then the transaction can iterate them
and execute their callbacks.
I've looked into WeakRef implementations that are available. On 1.9.3,
the stdlib weakref library is broken and we shouldn't use it.
There is a better implementation here:
https://github.com/bdurand/ref/blob/master/lib/ref/weak_reference/pure_ruby.rb
We could use that, either by pulling in the gem or just copying the code
in, but it still suffers from the limitation that it uses ObjectSpace
finalizers.
In my testing, this finalizers make GC quite expensive:
https://gist.github.com/3722432
Ruby 2.0 will have a native WeakRef implementation (via
ObjectSpace::WeakMap), hence won't be reliant on finalizers:
http://bugs.ruby-lang.org/issues/4168
So the ultimate solution will be for everyone to use Ruby 2.0, and for
us to just use ObjectSpace::WeakMap.
In the meantime, we have basically 3 options:
The first is to leave it as it is.
The second is to use a finalizer-based weakref implementation and take
the GC perf hit.
The final option is to store object ids rather than the actual objects.
Then use ObjectSpace._id2ref to deference the objects at the end of the
transaction, if they exist. This won't stop memory use growing within
the transaction, but it'll grow more slowly.
I benchmarked the performance of _id2ref this if the object does or does
not exist: https://gist.github.com/3722550
If it does exist it seems decent, but it's hugely more expensive if it
doesn't, probably because we have to do the rescue nil.
Probably most of the time the objects will exist. However the point of
doing this optimisation is to allow people to create a large number of
objects inside a transaction and have them be GC'd. So for that use
case, we'd be replacing one problem with another. I'm not sure which of
the two problems is worse.
My feeling is that we should just leave this for now and come back to it
when Ruby 2.0 is out.
I'm going to revert your commit because I can't see how it solves this.
Hope you don't mind... if I've misunderstood then let me know!
Jon
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transaction.
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This fixes issue #3217.
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Currently, when saving a frozen record, an exception would be thrown
which causes a rollback. However, there is a bug in active record that
"defrost" the record as a side effect:
>> t = Topic.new
=> #<Topic id: nil, ...>
>> t.freeze
=> #<Topic id: nil, ...>
>> t.save
RuntimeError: can't modify a frozen Hash
>> t.frozen?
=> false
>> t.save
=> true
This patch fixes the bug by explictly restoring the frozen state on the
attributes Hash after every rollback.
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Allow manual rollbacks in after_save to reset object correctly
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This reverts commit ee2be435b1e5c0e94a4ee93a1a310e0471a77d07.
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If we don't have a primary key when we ask for it, it's better to fail
fast. Fixes GH #2307.
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available
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Signed-off-by: José Valim <jose.valim@gmail.com>
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Conflicts:
activerecord/examples/performance.rb
activerecord/lib/active_record/association_preload.rb
activerecord/lib/active_record/associations.rb
activerecord/lib/active_record/associations/association_proxy.rb
activerecord/lib/active_record/autosave_association.rb
activerecord/lib/active_record/base.rb
activerecord/lib/active_record/nested_attributes.rb
activerecord/test/cases/relations_test.rb
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public interface.
Signed-off-by: Santiago Pastorino <santiago@wyeworks.com>
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Conflicts:
activerecord/lib/active_record/associations/association_proxy.rb
activerecord/lib/active_record/autosave_association.rb
activerecord/lib/active_record/base.rb
activerecord/lib/active_record/persistence.rb
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Because AR::Rollback do not reraise and inner transaction is not "real"
nothing rollback at all
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- persisted? is the API defined in ActiveModel
- makes it easier for extension libraries to conform to ActiveModel APIs
without concern for whether the extended object is specifically
ActiveRecord
[#5927 state:committed]
Signed-off-by: Santiago Pastorino <santiago@wyeworks.com>
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Conflicts:
actionpack/lib/abstract_controller/base.rb
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[#2991]
Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>
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for validation callbacks.
[#2991 state:committed]
Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>
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tests to use new style API with an :on options instead of on_* suffix." and "Add after_commit and after_rollback callbacks to ActiveRecord that are called after transactions either commit or rollback on all records saved or destroyed in the transaction.""
This reverts commit 1b2941cba1165b0721f57524645fe378bee2a950.
[#2991]
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use new style API with an :on options instead of on_* suffix." and "Add after_commit and after_rollback callbacks to ActiveRecord that are called after transactions either commit or rollback on all records saved or destroyed in the transaction."
This reverts commits d2a49e4b1f30c5997e169110eed94a55aee53f56 and da840d13da865331297d5287391231b1ed39721b.
[#2991]
Conflicts:
activerecord/CHANGELOG
activerecord/lib/active_record/transactions.rb
activerecord/test/cases/transaction_callbacks_test.rb
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with an :on options instead of on_* suffix.
[#2991]
Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>
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