| Commit message (Collapse) | Author | Age | Files | Lines |
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Update API doc for #includes on unnecessary #references
[ci skip]
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Update doc for #includes to clarify that #references is unnecessary when conditions are passed into #includes as a hash.
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record (#35784)
* Add `ActiveRecord::Relation#extract_associated` for extracting associated records from a relation
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This patch has two main portions:
1. Add SQL comment support to Arel via Arel::Nodes::Comment.
2. Implement a Relation#annotate method on top of that.
== Adding SQL comment support
Adds a new Arel::Nodes::Comment node that represents an optional SQL
comment and teachers the relevant visitors how to handle it.
Comment nodes may be added to the basic CRUD statement nodes and set
through any of the four (Select|Insert|Update|Delete)Manager objects.
For example:
manager = Arel::UpdateManager.new
manager.table table
manager.comment("annotation")
manager.to_sql # UPDATE "users" /* annotation */
This new node type will be used by ActiveRecord::Relation to enable
query annotation via SQL comments.
== Implementing the Relation#annotate method
Implements `ActiveRecord::Relation#annotate`, which accepts a comment
string that will be appeneded to any queries generated by the relation.
Some examples:
relation = Post.where(id: 123).annotate("metadata string")
relation.first
# SELECT "posts".* FROM "posts" WHERE "posts"."id" = 123
# LIMIT 1 /* metadata string */
class Tag < ActiveRecord::Base
scope :foo_annotated, -> { annotate("foo") }
end
Tag.foo_annotated.annotate("bar").first
# SELECT "tags".* FROM "tags" LIMIT 1 /* foo */ /* bar */
Also wires up the plumbing so this works with `#update_all` and
`#delete_all` as well.
This feature is useful for instrumentation and general analysis of
queries generated at runtime.
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We as Arm Treasure Data are using Optimizer Hints with a monkey patch
(https://gist.github.com/kamipo/4c8539f0ce4acf85075cf5a6b0d9712e),
especially in order to use `MAX_EXECUTION_TIME` (refer #31129).
Example:
```ruby
class Job < ApplicationRecord
default_scope { optimizer_hints("MAX_EXECUTION_TIME(50000) NO_INDEX_MERGE(jobs)") }
end
```
Optimizer Hints is supported not only for MySQL but also for most
databases (PostgreSQL on RDS, Oracle, SQL Server, etc), it is really
helpful to turn heavy queries for large scale applications.
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Replace “can not” with “cannot”.
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#35360 allows table name qualified if `from` has original table name.
But that is still too strict. We have a valid use case that `from` with
INDEX hint (e.g. `from("comments USE INDEX (PRIMARY)")`).
So I've relaxed the table name detection in `from` to allow any
extension like INDEX hint.
Fixes #35359.
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Add reselect method
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`primary key` is integer
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It's mentioned everywhere as `ActiveRecord::RecordNotFound` so to be
coherent with the rest of the documentation I've applied it here.
Also doc was saying if the parameter is integer it coerces it which is
other way around.
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`ClassSpecificRelation`
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DISTINCT
When using `select` with `'DISTINCT( ... )'` if you use method `size` on a non loaded relation it overrides the column selected by passing `:all` so it returns different value than count.
This fixes #35214
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This is caused by 0ee96d1.
Since #18744, `select` columns doesn't be qualified by table name if
using `from`. 0ee96d1 follows that for `pluck` as well.
But people depends that `pluck` columns are qualified even if using
`from`.
So I've fixed that to be qualified if `from` has the original table name
to keep the behavior as much as before.
Fixes #35359.
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Revert "Fix lint `ShadowingOuterLocalVariable`"
This reverts commit 38bd45a48992b500478a82d56d31468a322937a8.
Change of variable name
Fix lint `ShadowingOuterLocalVariable`
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That is considered as silently leaking information.
If type casting doesn't return any actual value, it should not be
matched to any record.
Fixes #33624.
Closes #33946.
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This fixes a bug that the `foreign_key` and the `foreign_type` are
separated as different table conditions if a polymorphic association has
a scope that joins another tables.
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Raise ActiveRecord::IrreversibleOrderError if nulls first/last is not a single ordering argument.
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single ordering argument.
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This follows up 0ee96d13de29680e148ccb8e5b68025f29fd091c.
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as leaked
This deprecates using class level querying methods if the receiver scope
regarded as leaked, since #32380 and #35186 may cause that silently
leaking information when people upgrade the app.
We need deprecation first before making those.
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methods"
This reverts #32380, since this may cause that silently leaking
information when people upgrade the app.
We need deprecation first before making this.
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Currently custom attributes are always qualified by the table name in
the generated SQL wrongly even if the table doesn't have the named
column, it would cause an invalid SQL error.
Custom attributes should only be qualified if the table has the same
named column.
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The `distinct` affects (reduces) rows of the result, so it is important
part when both `distinct` and `offset` are given.
Replacing SELECT clause to `1 AS one` and removing `distinct` and
`order` is just optimization for the `exists?`, we should not apply the
optimization for that case.
Fixes #35191.
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Don't use `false` as special value to skip to find inherited scope, we
could use `skip_inherited_scope = true`, and move `_scoping` back on
Relation.
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This follows up d97980a16d76ad190042b4d8578109714e9c53d0.
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Active Record uses `scoping` to delegate to named scopes from relations
for propagating the chaining source scope. It was needed to restore the
source scope in named scopes, but it was caused undesired behavior that
pollute all class level querying methods.
Example:
```ruby
class Topic < ActiveRecord::Base
scope :toplevel, -> { where(parent_id: nil) }
scope :children, -> { where.not(parent_id: nil) }
scope :has_children, -> { where(id: Topic.children.select(:parent_id)) }
end
# Works as expected.
Topic.toplevel.where(id: Topic.children.select(:parent_id))
# Doesn't work due to leaking `toplevel` to `Topic.children`.
Topic.toplevel.has_children
```
Since #29301, the receiver in named scopes has changed from the model
class to the chaining source scope, so the polluting class level
querying methods is no longer required for that purpose.
Fixes #14003.
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Currently several queries cannot return correct result due to incorrect
`RangeError` handling.
First example:
```ruby
assert_equal true, Topic.where(id: [1, 9223372036854775808]).exists?
assert_equal true, Topic.where.not(id: 9223372036854775808).exists?
```
The first example is obviously to be true, but currently it returns
false.
Second example:
```ruby
assert_equal topics(:first), Topic.where(id: 1..9223372036854775808).find(1)
```
The second example also should return the object, but currently it
raises `RecordNotFound`.
It can be seen from the examples, the queries including large number
assuming empty result is not always correct.
Therefore, This change handles `RangeError` to generate executable SQL
instead of raising `RangeError` to users to always return correct
result. By this change, it is no longer raised `RangeError` to users.
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The `unboundable?` behaves like the `infinite?`.
```ruby
inf = Topic.predicate_builder.build_bind_attribute(:id, Float::INFINITY)
inf.infinite? # => 1
oob = Topic.predicate_builder.build_bind_attribute(:id, 9999999999999999999999999999999)
oob.unboundable? # => 1
inf = Topic.predicate_builder.build_bind_attribute(:id, -Float::INFINITY)
inf.infinite? # => -1
oob = Topic.predicate_builder.build_bind_attribute(:id, -9999999999999999999999999999999)
oob.unboundable? # => -1
```
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dylanahsmith/better-composed-of-single-field-query
activerecord: Use a simpler query condition for aggregates with one mapping
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methods by default
Co-Authored-By: dylanahsmith <dylan.smith@shopify.com>
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class
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This slightly change the code in the Arel to allow +/-INFINITY as open
ended since the Active Record expects that behavior. See 5ecbeda.
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Allow `ActionController::Params` as argument of
`ActiveRecord::Base#exists?`
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Since Ruby 2.6.0 NilClass#to_d is returning `BigDecimal` 0.0, this
breaks `average` compatibility with prior Ruby versions. This patch
makes `average` return `nil` in all Ruby versions when there are no
rows.
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