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Use SQL COUNT and LIMIT 1 queries for none? and one? methods if no block or limit is given,
instead of loading the entire collection to memory. The any? and many? methods already
follow this behavior.
[Eugene Gilburg & Rafael Mendonça França]
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`bound_attributes` is now used universally across the board, removing
the need for the conversion layer. These changes are mostly mechanical,
with the exception of the log subscriber. Additional, we had to
implement `hash` on the attribute objects, so they could be used as a
key for query caching.
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The bind values can come from four places. `having`, `where`, `joins`,
and `from` when selecting from a subquery that contains binds. These
need to be kept in a specific order, since the clauses will always
appear in that order. Up until recently, they were not.
Additionally, `joins` actually did keep its bind values in a separate
location (presumably because it's the only case that people noticed was
broken). However, this meant that anything accessing just `bind_values`
was broken (which most places were). This is no longer possible, there
is only a single way to access the bind values, and it includes joins in
the proper location. The setter was removed yesterday, so breaking `+=`
cases is not possible.
I'm still not happy that `joins` is putting it's bind values on the
Arel AST, and I'm planning on refactoring it further, but this removes a
ton of bug cases.
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Contrary to my previous commit message, it wasn't overkill, and led to
much cleaner code.
[Sean Griffin & anthonynavarre]
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The last place that was assigning it was when `from` is called with a
relation to use as a subquery. The implementation was actually
completely broken, and would break if you called `from` more than once,
or if you called it on a relation, which also had its own join clause,
as the bind values would get completely scrambled. The simplest solution
was to just move it into its own array, since creating a `FromClause`
class for this would be overkill.
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This fixed an issue where `having` can only be called after the last
call to `where`, because it messes with the same `bind_values` array.
With this change, the two can be called as many times as needed, in any
order, and the final query will be correct. However, once something
assigns `bind_values`, that stops. This is because we have to move all
of the bind values from the having clause over to the where clause since
we can't differentiate the two, and assignment was likely in the form
of:
`relation.bind_values += other.bind_values`
This will go away once we remove all places that are assigning
`bind_values`, which is next on the list.
While this fixes a bug that was present in at least 4.2 (more likely
present going back as far as 3.0, becoming more likely in 4.1 and later
as we switched to prepared statements in more cases), I don't think this
can be easily backported. The internal changes to `Relation` are
non-trivial, anything that involves modifying the `bind_values` array
would need to change, and I'm not confident that we have sufficient test
coverage of all of those locations (when `having` was called with a hash
that could generate bind values).
[Sean Griffin & anthonynavarre]
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The way that bind values are currently stored on Relation is a mess.
They can come from `having`, `where`, or `join`. I'm almost certain that
`having` is actually broken, and calling `where` followed by `having`
followed by `where` will completely scramble the binds.
Joins don't actually add the bind parameters to the relation itself, but
instead add it onto an accessor on the arel AST which is undocumented,
and unused in Arel itself. This means that the bind values must always
be accessed as `relation.arel.bind_values + relation.bind_values`.
Anything that doesn't is likely broken (and tons of bugs have come up
for exactly that reason)
The result is that everything dealing with `Relation` instances has to
know far too much about the internals. The binds are split, combined,
and re-stored in non-obvious ways that makes it difficult to change
anything about the internal representation of `bind_values`, and is
extremely prone to bugs.
So the goal is to move a lot of logic off of `Relation`, and into
separate objects. This is not the same as what is currently done with
`JoinDependency`, as `Relation` knows far too much about its internals,
and vice versa. Instead these objects need to be black boxes that can
have their implementations swapped easily.
The end result will be two classes, `WhereClause` and `JoinClause`
(`having` will just re-use `WhereClause`), and there will be a single
method to access the bind values of a `Relation` which will be
implemented as
```
join_clause.binds + where_clause.binds + having_clause.binds
```
This is the first step towards that refactoring, with the internal
representation of where changed, and an intermediate representation of
`where_values` and `bind_values` to let the refactoring take small
steps. These will be removed shortly.
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In order to better facilitate refactoring, most places that mutated
`bind_values` have already been removed. One last spot snuck through.
Since we're no longer mutating the array, it also does not need to be
duped in `initialize_copy`.
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I'm planning on deprecating the column argument to mirror the
deprecation in [arel].
[arel]: https://github.com/rails/arel/commit/6160bfbda1d1781c3b08a33ec4955f170e95be11
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Changed ActiveRecord::Relation#update behavior so that it will work on Relation objects without giving id
Conflicts:
activerecord/CHANGELOG.md
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callbacks and validations
- Right now, there is no method to update multiple records with
validations and callbacks.
- Changed the behavior of existing `update` method so that when `id`
attribute is not given and the method is called on an `Relation`
object, it will execute update for every record of the `Relation` and
will run validations and callbacks for every record.
- Added test case for validating that the callbacks run when `update` is
called on a `Relation`.
- Changed test_create_columns_not_equal_attributes test from
persistence_test to include author_name column on topics table as it
it used in before_update callback.
- This change introduces performance issues when a large number of
records are to be updated because it runs UPDATE query for every
record of the result. The `update_all` method can be used in that case
if callbacks are not required because it will only run single UPDATE
for all the records.
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This error only happens when the foreign key is missing.
Before this fix the following exception was being raised:
NoMethodError: undefined method `val' for #<Arel::Nodes::BindParam:0x007fc64d19c218>
Now the message is:
ActiveRecord::UnknownAttributeError: unknown attribute 'foreign_key' for Model.
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Construction of relations can be a hotspot, we don't want to create one
of these in the constructor. This also allows us to do more expensive
things in the predicate builder's constructor, since it's created once
per AR::Base subclass
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In order to maintain thread safety and prevent race condition from memoization.
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`where_sql` now requires that we pass it an engine. None of the manager
classes take an engine in their constructor.
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It now contains a carefully formulated reference to the "current relation" which might help clarify that the receiving will generate its own scope, escaping the need for explicitly referencing `default_scope` which is, after all, just another way of specifying a scope and nothing special.
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This was not explicitly stated before and I needed to try it out to be
certain. A little explicit statement in the API docs might help here.
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Oh hey, we got to remove some code because of that!
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Arel handles this for us automatically. Updated tests, as BindParam is
no longer a subclass of SqlLiteral. We should remove the second argument
to substitute_at entirely, as it's no longer used
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We need to re-order the bind parameters since the AST returned by the
relation will have the where statement as the first bp, which breaks on
PG.
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In practical terms, this allows serialized columns and tz aware columns
to be used in wheres that go through joins, where they previously would
not behave correctly. Internally, this removes 1/3 of the cases where we
rely on Arel to perform type casting for us.
There were two non-obvious changes required for this. `update_all` on
relation was merging its bind values with arel's in the wrong order.
Additionally, through associations were assuming there would be no bind
parameters in the preloader (presumably because the where would always
be part of a join)
[Melanie Gilman & Sean Griffin]
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This slightly simplifies the code, and reduces the number of times we
need to iterate over the attributes by one.
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This clarify the fact that `#update_all` doesn't type-cast passed
values and that these values are written as-is in the SQL DB.
Fix #17242
[ci skip]
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Baseclass becomes! subclass
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When relation scopes include one of `uniq`, `group`, `having` or
`offset`, the generated query ignores them and that causes unintended
records to be deleted. This solves the issue by restricting the deletion
when those scopes are present.
rails/rails#11985
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* master: (70 commits)
[ci skip] Added link to ruby-lang.org installation.
Use the index on hidden field
`collection_check_boxes` respects `:index` option for the hidden filed name.
docs, double meaning of `serialize` argument. Closes #14284.
Just call read_attribute, no need to use `send`.
- Fix lingering reference to `:text` instead of the newer `:plain` - Section references `form_tag` instead of the `form_for` used in the example
again, read_attribute is public, so just call it
read_attribute is public, so we should just call it
Disable assest cache store in docs [ci skip]
Make counter cache decrementation on destroy idempotent
Write the failing test case for concurrent counter cache
[ci skip] Use plain underscore instead of "\_".
Update documentation to use Rails.application instead
Add a changelog entry for #14546 [ci skip]
Move tests for deep_dup and duplicable to object directory
Missing 'are' in note - [ci skip]
CollectionHelpers now accepts a readonly option
Fix a few typos [ci skip]
Bundle tzinfo-data on :x64_mingw (64-bit Ruby on Windows).
don't bother with an offset if the offset is zero
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consistent.
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Example:
author.posts == Post.where(author_id: author.id)
# => true
Post.where(author_id: author.id) == author.posts
# => true
Fixes #13506
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swoker/activerecord_fix_aggregate_methods_with_select
Activerecord fix aggregate methods with select
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Fix insertion of records for hmt association with scope
Conflicts:
activerecord/CHANGELOG.md
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makes adequaterecord work with arel master.
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* master: (122 commits)
Rails.application should be set inside before_configuration hook
remove check for present? from delete_all
Remove useless begin..end
Build the reverse_order on its proper method.
Use connection-specific bytea escaping
Ignore order when doing count.
make enums distinct per class
Remove unused `subclass_controller_with_flash_type_bar` var from flash test.
fix CollectionProxy delete_all documentation
Added OS X specific commands to installation guide [ci skip] Recommended using homebrew for installing MySQL and PostgreSQL
Fix setup of adding _flash_types test.
Use SVG version of travis build status badge [skip ci]
W3C CSP document moved to gihub.io URL [ci skip]
sprockets-rails was released
Fix the test defining the models in the right place
Add CHANGELOG entry for #11650 [ci skip]
Declare the assets dependency
Use sass-rails 4.0.3
Make possible to use sprockets-rails 2.1
add missing parentheses to validates_with documentation [skip ci]
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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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* master: (108 commits)
make tests pass on Ruby 2.2
Use Sqlite3 adapter in examples
use the body proxy to freeze headers
just ask the response for the commit status, we do not need to ask the jar
only write the jar if the response isn't committed
Fix a grammatical error in the i18n guide [ci skip]
use method_defined? to check whether or not a method is defined
Enhance docs for update_attribute [ci-skip]
Change usec to 0 on tests that compare seconds
Unit test for mysql quote time usec
Changelog entry for mysql56 microseconds
Test microsecond on mysql 5.6
MySQL 5.6 and later supports microsecond precision in datetime.
[ci skip] Add documentation for original_fullpath.
Remove mocking on save, when not necessary
comment why we are modifying global state. [ci skip]
`change_table` supports `citext`. Follow up to #12523.
Removed unnecessary command "application"
register OID for PostgreSQL citex datatype [Troy Kruthoff & Lachlan Sylvester]
Fixes STI when 2+ levels deep.
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This is a partial revert of 22b3481ba2aa55fad1f9a5db94072312b345fb55.
The current implementation of `references_eager_loaded_tables?` needs to know
every table involved in the query. With the current API this is not possible
without SQL parsing.
While a2dab46cae35a06fd5c5500037177492a047c252 deprecated SQL parsing for `includes`.
It did not issue deprecation warnings when String joins are involved. This resulted
in a breaking change after the deprecated behavior was removed (22b3481ba2aa55fad1f9a5db94072312b345fb55).
We will need to rethink the usage of `includes`, `preload` and `eager_load` but for now,
this brings back the old *working* behavior.
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* master: (311 commits)
Add a missing changelog entry for #13981 and #14035
Revert "Fixed plugin_generator test"
implements new option :month_format_string for date select helpers [Closes #13618]
add factory methods for empty alias trackers
guarantee a list in the alias tracker so we can remove a conditional
stop exposing table_joins
make most parameters to the AliasTracker required
make a singleton for AssociationScope
pass the association and connection to the scope method
pass the tracker down the stack and construct it in the scope method
clean up add_constraints signature
remove the reflection delegate
remove klass delegator
remove railties changes. fixes #14054
remove chain delegate
remove scope_chain delegate
Add verb to sanitization note
fix path shown in mailer's templates
updated Travis build status image url
fix guide active_support_core_extensions. add Note to String#indent [ci skip]
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Conflicts:
activerecord/lib/active_record/associations/join_dependency.rb
activerecord/test/cases/associations/association_scope_test.rb
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