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Association and its inherited classes
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ActiveRecord::Associations::Builder::Association class
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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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#join_associations.
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Suppose Man has_many interests, and inverse_of is used.
Man.first.interests.first.man will correctly execute two queries,
avoiding the need for a third query when Interest#man is called. This is
because CollectionAssociation#first calls set_inverse_instance.
However Man.first.interests.where("1=1").first.man will execute three
queries, even though this is obviously a subset of the records in the
association.
This is because calling where("1=1") spawns a new Relation object from
the CollectionProxy object, and the Relation has no knowledge of the
association, so it cannot set the inverse instance.
This commit solves the problem by making relations spawned from
CollectionProxies return a new Relation subclass called
AssociationRelation, which does know about associations. Records loaded
from this class will get the inverse instance set properly.
Fixes #5717.
Live commit from La Conf! :sparkles:
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the results. Added tests to check to make sure that inverse associations are
automatically found when has_many, has_one, or belongs_to associations
are defined.
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Confirm a record has not already been destroyed before decrementing counter cache
Conflicts:
activerecord/CHANGELOG.md
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counter cache
At present, calling destroy multiple times on the same record results
in the belongs_to counter cache being decremented multiple times. With
this change the record is checked for whether it is already destroyed
prior to decrementing the counter cache.
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assignment
For one-to-one nested associations, if you build the new (in-memory)
child object yourself before assignment, then the NestedAttributes
module will not overwrite it, e.g.:
class Member < ActiveRecord::Base
has_one :avatar
accepts_nested_attributes_for :avatar
def avatar
super || build_avatar(width: 200)
end
end
member = Member.new
member.avatar_attributes = {icon: 'sad'}
member.avatar.width # => 200
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activerecord/lib/active_record/associations.rb states:
# [association=(associate)]
# Assigns the associate object, extracts the primary key, sets it as the foreign key,
# and saves the associate object.
Since commit 42dd5d9f2976677a4bf22347f2dde1a8135dfbb4 to fix #7191, this
is no longer the case if the associate has changed, but is the same
object. For example:
# Pirate has_one :ship
pirate = Pirate.create!(catchphrase: "A Pirate")
ship = pirate.build_ship(name: 'old name')
ship.save!
ship.name = 'new name'
pirate.ship = ship
That last line should trigger a save. Although we are not changing the
association, the associate (ship) has changed.
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Trying to lookup the parent class when the association is being built
runs the risk of generating uninitialized constant errors because
classes haven't been fully defined yet. To work around this we look up
the class at runtime through the `association` method.
Fixes #10197.
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when transitioning to new association" until a proper fix is found for #10197"
This reverts commit 7389df139a35436f00876c96d20e81ba23c93f0a.
Conflicts:
activerecord/test/cases/timestamp_test.rb
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transitioning to new association" until a proper fix is found for #10197
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This commit fixes a regression bug in which counter_cache columns
were not being updated correctly when newly created records were
being pushed into an assocation. EG:
# this was fine
@post.comment.create!
# this was fine
@comment = Comment.first
@post.comments << @comment
# this would not update counters
@post.comments << Comment.create!
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Conflicts:
guides/source/action_mailer_basics.md
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Fixes #3002. Also see #5494.
```
class Comment < ActiveRecord::Base
belongs_to :post
end
class Author < ActiveRecord::Base
has_many :posts
end
class Post < ActiveRecord::Base
belongs_to :author
has_many :comments
end
```
`Comment.joins(:post).merge(Post.joins(:author).merge(Author.where(:name => "Joe Blogs"))).all` would
fail with `ActiveRecord::ConfigurationError: Association named 'author' was not found on Comment`.
It is failing because `all` is being called on relation which looks like this after all the merging:
`{:joins=>[:post, :author], :where=>[#<Arel::Nodes::Equality: ....}`. In this relation all the context that
`Post` was joined with `Author` is lost and hence the error that `author` was not found on `Comment`.
Ths solution is to build JoinAssociation when two relations with join information are being merged. And later
while building the arel use the previously built `JoinAssociation` record in `JoinDependency#graft` to
build the right from clause.
Thanks to Jared Armstrong (https://github.com/armstrjare) for most of the work. I ported it to make it
compatible with new code base.
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Current code stores the klass name in active_record and this
is used throughout. While reviewing the code time and again
I had the mental picture of active_record being an instance of
a klass. However here the actual klass is being stored in
@active_record.
Secondly at two different places while referring to @active_record
the comment refers to it as base klass. All this points to
active_record being not the best variable name.
So I thought it is better to replace active_record with base_klass.
This change is confined to JoinDependency, JoinBase, JoinPart and
JoinAssociation - all joining related work.
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If the reflection scope is not flagged with distinct value, there is no
need to iterate over the records, so we avoid that by doing the check
before iterating rather than inside the iteration block.
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Association with inverse_of does not set the parent in association building block
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This fixes inconsistency when building children of association
which has inverse_of set properly.
When creating new association object with a block:
parent.association.build do |child|
child.parent.equal?(parent) # false
end
So the block the `child.parent` did not point to the same object.
But when the object is created it points to same instance:
child = parent.association.build
child.parent.equal?(parent) # true
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Avoid calling define_method in CollectionProxy#scope
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The implementation was using the source class foreign key field instead
of the reflected primary key one to find the old record.
For instance, for this scenario
class Bulb < ActiveRecord::Base
belongs_to :car, :touch => true
end
class Car < ActiveRecord::Base
has_many :bulbs
end
the current implementation was trying to do this query:
Car.where(car_id: X).first
where we should be doing this query:
Car.where(id: X).first
This should hopefully fix the build.
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If we don't use inspect inside the class_eval block then the foreign key
is written without quotes causing us to fetch the foreign key value and
not the column name.
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thanks to @egilburg for suggestion
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has_many through obeys order on through association
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fixes #10016
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minor fixes including variable name change and expanded rdoc
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belongs_to :touch should touch old record when transitioning.
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optimize some code around merge
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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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Conflicts:
activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
activerecord/test/cases/adapter_test.rb
guides/source/testing.md
[ci skip]
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