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In the end I think the pain of implementing this seamlessly was not
worth the gain provided.
The intention was that it would allow plain ruby objects that might not
live in your main application to be subclassed and have persistence
mixed in. But I've decided that the benefit of doing that is not worth
the amount of complexity that the implementation introduced.
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This reverts commit 83846838252397b3781eed165ca301e05db39293.
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I think it's going to be too much pain to try to transition the
:active_record load hook from executing against Base to executing
against Model.
For example, after Model is included in Base, and modules included in
Model will no longer get added to the ancestors of Base.
So plugins which wish to be compatible with both Model and Base should
use the :active_record_model load hook which executes *before* Base gets
loaded.
In general, ActiveRecord::Model is an advanced feature at the moment and
probably most people will continue to inherit from ActiveRecord::Base
for the time being.
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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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* There is no need to delete the primary key from cloned attributes,
since it sets the same pk to nil afterwards.
* Check for empty? instead of any? to run initialize callbacks.
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transaction.
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any? will check that each item in the array is truthy, as opposed to
!empty? which will simply check that the array has length. For an empty
array, !empty? still seems to be faster than any?
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deep_dup is slow. we only need to dup the values, so just do that
directly.
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It's not really a good idea to have this as a global config option. We
should allow people to specify the behaviour per association.
There will now be two new values:
* :dependent => :restrict_with_exception implements the current
behaviour of :restrict. :restrict itself is deprecated in favour of
:restrict_with_exception.
* :dependent => :restrict_with_error implements the new behaviour - it
adds an error to the owner if there are dependent records present
See #4727 for the original discussion of this.
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This reverts commit 14fc8b34521f8354a17e50cd11fa3f809e423592.
Reason: we need to discuss a better path from this removal.
Conflicts:
activerecord/lib/active_record/reflection.rb
activerecord/test/cases/base_test.rb
activerecord/test/models/developer.rb
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This feature adds a lot of complication to ActiveRecord for dubious
value. Let's talk about what it does currently:
class Customer < ActiveRecord::Base
composed_of :balance, :class_name => "Money", :mapping => %w(balance amount)
end
Instead, you can do something like this:
def balance
@balance ||= Money.new(value, currency)
end
def balance=(balance)
self[:value] = balance.value
self[:currency] = balance.currency
@balance = balance
end
Since that's fairly easy code to write, and doesn't need anything
extra from the framework, if you use composed_of today, you'll
have to add accessors/mutators like that.
Closes #1436
Closes #2084
Closes #3807
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Get rid of ActiveModel::Configuration, make better use of
ActiveSupport::Concern + class_attribute, etc.
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There are two possible scenarios where the @mass_assignment_options
instance variable can become corrupted:
1. If the assign_attributes doesn't complete correctly, then
subsequent calls to a nested attribute assignment method will use
whatever options were passed to the previous assign_attributes call.
2. With nested assign_attributes calls, the inner call will overwrite
the current options. This will only affect nested attributes as the
attribute hash is sanitized before any methods are called.
To fix this we save the current options in a local variable and then
restore these options in an ensure block.
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Conflicts:
activerecord/lib/active_record/core.rb
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Introduced in 7ecfe3d30ccfaee8dcca4ee649cc006c090bdfb4
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Conflicts:
actionpack/lib/action_view/helpers/asset_tag_helper.rb
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[ci skip]
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Conflicts:
activesupport/lib/active_support/callbacks.rb
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Add #nodoc to initialize_dup and use :method: to document the #dup method.
Relates to issue #6235
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The #relation method gets called in four places and the return value was instantly cloned in three of them. The only place that did not clone was ActiveRecord::Scoping::Default::ClassMethods#unscoped. This introduced a bug described in #5667 and should really clone the relation, too. This means all four places would clone the relation, so it doesn't make a lot of sense caching it in the first place.
The four places with calls to relations are:
activerecord/lib/active_record/scoping/default.rb:110:in `block in build_default_scope'"
activerecord/lib/active_record/scoping/default.rb:42:in `unscoped'"
activerecord/lib/active_record/scoping/named.rb:38:in `scoped'"
activerecord/lib/active_record/scoping/named.rb:52:in `scope_attributes'"
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ActiveRecord::Base::ConnectionSpecification objects.
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This apparently fix the warning related to @new_record variable not
being initialized in AR's test suit, when an association is built and
the object is marshalled/loaded.
See these tests in AR's base_test.rb:
test_marshalling_with_associations
test_marshalling_new_record_round_trip_with_associations
Closes #3720.
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named field
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* master: (30 commits)
Bump tzinfo. 0.3.31 was released on November 6, 2011.
Fix GH #4909. Dependency on TZInfo move from AR to AS.
moving ordered hash to normal hash because ruby 1.9.3 hash defaultly ordered one
Refactored the OrderedHash related stuff
Replaced OrderedHash usage with Ruby 1.9 Hash
Replaced OrderedHash with Hash for ruby 1.9 series
removed unnecessary code
replacing the orderhash with hash for ruby-1.9
Clean up some wording.
Fix typo.
test title changed corresponding to the test
replaced active support ordered hash to ruby hash on active resource
PostgreSQL does not work in the same way of the other adapters
AR::Relation#pluck: improve to work with joins
Fix match docs
Fix attribute_before_type_cast for serialized attributes. Fixes #4837.
Fix failing request test
Fixes in AMo README
Update README to mention lint.
Trim down Active Model API by removing valid? and errors.full_messages
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Conflicts:
activerecord/lib/active_record/relation/query_methods.rb
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looked up on the instance
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