| Commit message (Collapse) | Author | Age | Files | Lines |
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Passing in a blank string is a bug so there's no reason
to check for a blank string.
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Renamed private methods _create_record and _update_record
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This is to ensure that they are not accidentally called by the app code.
They are renamed to _create_record and _update_record respectively.
Closes #11645
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When delete_all is run on a CollectionProxy and has a
dependency of delete_all the SQL that is produced has an IN
statement. (DELETE FROM `associated_model` where `associated_model`
.`parent_id` = 1 AND `associated_model`.`id` IN (1, 2, 3...)).
This only happens if the association is not loaded (both loaded
and non-loaded delete_all should behave the same. This is a huge
problem when it comes to deleting many records because the query
becomes very slow. Instead the SQL produced should be (DELETE FROM
`assoicated_model` where `associated_model`.`parent_model_id`=1).
I fixed this by making sure the check for loaded and destroy also
makes sure that the dependent is not delete_all, so the conditional
goes to the else and deletes the records directly without the IN
statement.
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Pass the id of the object to the method by calling `.id` on the AR
object.
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When replacing a has_many association with the same one, there is no
need to do a round-trip to the db to create/and drop a new transaction.
[fixes #14220]
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`before_add` callbacks are fired before the record is saved on
`has_and_belongs_to_many` assocations *and* on `has_many :through`
associations. Before this change, `before_add` callbacks would be fired
before the record was saved on `has_and_belongs_to_many` associations, but
*not* on `has_many :through` associations.
Fixes #14144
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constructor"
This reverts commit f9e4c3c7c0c4152b62fe9202a9d12262884bb118.
[fixes #14116]
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This commit fixes two regressions introduced in cafe31a078 where
newly created finder methods #second, #third, #forth, and #fifth
caused a NoMethodError error on reload associations and where we
were pulling the wrong element out of cached associations.
Examples:
some_book.authors.reload.second
# Before
# => NoMethodError: undefined method 'first' for nil:NilClass
# After
# => #<Author id: 2, name: "Sally Second", ...>
some_book.first.authors.first
some_book.first.authors.second
# Before
# => #<Author id: 1, name: "Freddy First", ...>
# => #<Author id: 1, name: "Freddy First", ...>
# After
# => #<Author id: 1, name: "Freddy First", ...>
# => #<Author id: 2, name: "Sally Second", ...>
Fixes #13783.
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derikson/collection_proxy_select_with_multiple_args
Change CollectionProxy#select to take the same arguments as ActiveRecord::select
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arguments.
This makes the arguments the same as ActiveRecord::QueryMethods::select.
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fix CollectionAssociation's comments
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AssociationProxy to match changes for 3.1 removing Association proxy.
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It is needed for activerecord-depecated_finders
This reverts commit dcff027a5242b20c0c90eb062dddb22ccf51aed9, reversing
changes made to 3a2093984ff49d86db1efeff0c7581e788ecfb9f.
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was using nullify strategy
This caused a regression in applications trying to upgrade.
Also if the user set the dependent option as destroy he expects to get
the records removed from the database.
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.find([1]) should return an Array of entries, even when a invese object is in memory already
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Fixed a bug in when using has_many association with :inverse_of option and UUID primary key.
Conflicts:
activerecord/CHANGELOG.md
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UUID primary key.
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Make CollectionAssociation first/last with integer fetch with query
Conflicts:
activerecord/CHANGELOG.md
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When first or last is called with an integer on an unloaded association,
the entire collection is loaded. This differs surprisingly from the
behavior of Relation#first/last, which translate the call into a limit
query. For large collections this can make a big difference in
performance.
Change CollectionAssociation#fetch_first_or_last_using_find? to make
this kind of call delegate to Relation.
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records, and don't bother updating the association if the update is going to be rejected anyway.
This requires adding a `skip_callbacks` argument to `#add_to_target`
so that we don't call the callbacks multiple times in this case,
which is functionally an application of existing association data,
rather than an addition of a new record to the association.
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Method `delete_all` should not be invoking callbacks and this
feature was deprecated in Rails 4.0. This is being removed.
`delete_all` will continue to honor the `:dependent` option. However
if `:dependent` value is `:destroy` then the default deletion
strategy for that collection will be applied.
User can also force a deletion strategy by passing parameter to
`delete_all`. For example you can do `@post.comments.delete_all(:nullify)`
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currently `post.comments.find(Comment.first.id)` would load all
comments for the given post to set the inverse association.
This has a huge performance penalty. Because if post has 100k
records and all these 100k records would be loaded in memory
even though the comment id was supplied.
Fix is to use in-memory records only if loaded? is true. Otherwise
load the records using full sql.
Fixes #10509
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This reverts commit 2b817a5e89ac0e7aeb894a40ae7151a0cf3cef16, reversing
changes made to 353a398bee68c5ea99d76ac7601de0a5fef6f4a5.
Conflicts:
activerecord/CHANGELOG.md
Reason: the build broke
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currently `post.comments.find(Comment.first.id)` would load all
comments for the given post to set the inverse association.
This has a huge performance penalty. Because if post has 100k
records and all these 100k records would be loaded in memory
even though the comment id was supplied.
Fix is to use in-memory records only if loaded? is true. Otherwise
load the records using full sql.
Fixes #10509
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Cleaned up rdoc a bit emphasizing that callbacks are called. Also
removed the stress on the fact that records are always removed.
If callbacks return false then records will not be deleted.
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so that it is consistent with the error thrown for +find+ without an
inverse_of association.
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inverse_of option. I've also refactored the code for raising a
RecordNotFound exception when searching for records with ids.
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Closes #9824.
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if the association already holds that record in memory before checking
the database for the specified ids.
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This reimplements the behaviour of Rails 3, as I couldn't see why we
shouldn't cache the object, and @alindeman had a good use case for
caching it:
https://github.com/rails/rails/commit/c86a32d7451c5d901620ac58630460915292f88b#commitcomment-2784312
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We moved more and more away from passing options to finder / calculation
methods. The `:distinct` option in `#count` was one of the remaining places.
Since we can now combine `Relation#distinct` with `Relation#count` the option
is no longer necessary and can be deprecated.
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The similarity of `Relation#uniq` to `Array#uniq` is confusing. Since our
Relation API is close to SQL terms I renamed `#uniq` to `#distinct`.
There is no deprecation. `#uniq` and `#uniq!` are aliases and will continue
to work. I also updated the documentation to promote the use of `#distinct`.
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`post.comments.delete_all` will fire callbacks if :dependent option is
:destroy . It will be fixed in Rails 4.1 . In the meantime display
a warning . Look at #9567 for details .
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At present, ActiveRecord::Delegation compiles delegation methods on a
global basis. The compiled methods apply to all subsequent Relation
instances. This creates several problems:
1) After Post.all.recent has been called, User.all.respond_to?(:recent)
will be true, even if User.all.recent will actually raise an error due
to no User.recent method existing. (See #8080.)
2) Depending on the AR class, the delegation should do different things.
For example, if a Post.zip method exists, then Post.all.zip should call
it. But this will then result in User.zip being called by a subsequent
User.all.zip, even if User.zip does not exist, when in fact
User.all.zip should call User.all.to_a.zip. (There are various
variants of this problem.)
We are creating these compiled delegations in order to avoid method
missing and to avoid repeating logic on each invocation.
One way of handling these issues is to add additional checks in various
places to ensure we're doing the "right thing". However, this makes the
compiled methods signficantly slower. In which case, there's almost no
point in avoiding method_missing at all. (See #8127 for a proposed
solution which takes this approach.)
This is an alternative approach which involves creating a subclass of
ActiveRecord::Relation for each AR class represented. So, with this
patch, Post.all.class != User.all.class. This means that the delegations
are compiled for and only apply to a single AR class. A compiled method
for Post.all will not be invoked from User.all.
This solves the above issues without incurring significant performance
penalties. It's designed to be relatively seamless, however the downside
is a bit of complexity and potentially confusion for a user who thinks
that Post.all and User.all should be instances of the same class.
Benchmark
---------
require 'active_record'
require 'benchmark/ips'
class Post < ActiveRecord::Base
establish_connection adapter: 'sqlite3', database: ':memory:'
connection.create_table :posts
def self.omg
:omg
end
end
relation = Post.all
Benchmark.ips do |r|
r.report('delegation') { relation.omg }
r.report('constructing') { Post.all }
end
Before
------
Calculating -------------------------------------
delegation 4392 i/100ms
constructing 4780 i/100ms
-------------------------------------------------
delegation 144235.9 (±27.7%) i/s - 663192 in 5.038075s
constructing 182015.5 (±21.2%) i/s - 850840 in 5.005364s
After
-----
Calculating -------------------------------------
delegation 6677 i/100ms
constructing 6260 i/100ms
-------------------------------------------------
delegation 166828.2 (±34.2%) i/s - 754501 in 5.001430s
constructing 116575.5 (±18.6%) i/s - 563400 in 5.036690s
Comments
--------
Bear in mind that the standard deviations in the above are huge, so we
can't compare the numbers too directly. However, we can conclude that
Relation construction has become a little slower (as we'd expect), but
not by a huge huge amount, and we can still construct a large number of
Relations quite quickly.
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