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Bring back private class methods accessibility in named scope
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The receiver in a scope was changed from `klass` to `relation` itself
for all scopes (named scope, default_scope, and association scope)
behaves consistently.
In addition. Before 5.2, if both an AR model class and a Relation
instance have same named methods (e.g. `arel_attribute`,
`predicate_builder`, etc), named scope doesn't respect relation instance
information.
For example:
```ruby
class Post < ActiveRecord::Base
has_many :comments1, class_name: "RecentComment1"
has_many :comments2, class_name: "RecentComment2"
end
class RecentComment1 < ActiveRecord::Base
self.table_name = "comments"
default_scope { where(arel_attribute(:created_at).gteq(2.weeks.ago)) }
end
class RecentComment2 < ActiveRecord::Base
self.table_name = "comments"
default_scope { recent_updated }
scope :recent_updated, -> { where(arel_attribute(:updated_at).gteq(2.weeks.ago)) }
end
```
If eager loading `Post.eager_load(:comments1, :comments2).to_a`,
`:comments1` (default_scope) respects aliased table name, but
`:comments2` (using named scope) may not work correctly since named
scope doesn't respect relation instance information. See also 801ccab.
But this is a breaking change between releases without deprecation.
I decided to bring back private class methods accessibility in named
scope.
Fixes #31740.
Fixes #32331.
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ccea4cf broke multiple database structure:dump, the current_config line
should have been deleted instead. I'm struggling to write a test for
this since the confings are passed from rake to the structure_dump
method rather than the other way around. Hoping to come up with a test
while I work on structure:load commands for multiple databases.
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2.6 warnings: passing splat keyword arguments as a single Hash
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Ruby 2.6.0 warns about this.
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Optimize the code inside AR::QueryCache middleware
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It is wrongly appeared as instance public methods in the doc.
http://api.rubyonrails.org/v5.1.6/classes/ActionCable/Channel/Callbacks.html
http://api.rubyonrails.org/v5.1.6/classes/ActiveRecord/Timestamp.html
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Remove `ForeignKeys` module which was introduced at #32299
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To solve the problem #32299, just enough to introduce
`fk_ignore_pattern` option.
I don't think there is a need to expose these constants.
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An entry in `ActiveRecord::Base.configurations` can either be a
connection spec ("two-level") or a hash of specs ("three-level").
We were detecting two-level configurations by looking for the `database`
key, but the database can also be specified as part of the `url` key,
which meant we incorrectly treated those configurations as three-level.
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Use current_config in structure_dump
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This looks like a typo from 0f0aa6a275876502e002c054896734d6536ba5cd
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Remove expired explanation [ci skip]
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Override callback doesn't work anymore.
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Don't unset foreign key when preloading missing record
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When a belongs to association's target is set, its foreign key is now
updated to match the new target. This is the correct behaviour when a
new record is assigned, but not when the existing record is preloaded.
As long as we mark the association as loaded, we can skip setting the
target when the record is missing and avoid clobbering the foreign key.
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Previously `relation.all` behaves as `relation.scoping { klass.all }`.
But it is just enough to `relation.spawn`.
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Fix deprecation warnings from with_lock
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Expose foreign key name ignore pattern in configuration
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This makes more sense, as the foreign key ignore pattern is only used by
the schema dumper.
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When dumping the database schema, Rails will dump foreign key names only
if those names were not generate by Rails. Currently this is determined
by checking if the foreign key name is `fk_rails_` followed by
a 10-character hash.
At [Cookpad](https://github.com/cookpad), we use
[Departure](https://github.com/departurerb/departure) (Percona's
pt-online-schema-change runner for ActiveRecord migrations) to run migrations.
Often, `pt-osc` will make a copy of a table in order to run a long migration
without blocking it. In this copy process, foreign keys are copied too,
but [their name is prefixed with an underscore to prevent name collision
](https://www.percona.com/doc/percona-toolkit/LATEST/pt-online-schema-change.html#cmdoption-pt-online-schema-change-alter-foreign-keys-method).
In the process described above, we often end up with a development
database that contains foreign keys which name starts with `_fk_rails_`.
That name does not match the ignore pattern, so next time Rails dumps
the database schema (eg. when running `rake db:migrate`), our
`db/schema.rb` file ends up containing those unwanted foreign key names.
This also produces an unwanted git diff that we'd prefer not to commit.
In this PR, I'd like to suggest a way to expose the foreign key name
ignore pattern to the Rails configuration, so that individual projects
can decide on a different pattern of foreign keys that will not get
their names dumped in `schema.rb`.
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Part 1 Easy Multi db in Rails: Add basic rake tasks for multi db setup
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Moves the configs_for and DatabaseConfig struct into it's own file. I
was considering doing this in a future refactoring but our set up forced
me to move it now. You see there are `mattr_accessor`'s on the Core
module that have default settings. For example the `schema_format`
defaults to Ruby. So if I call `configs_for` or any methods in the Core
module it will reset the `schema_format` to `:ruby`. By moving it to
it's own class we can keep the logic contained and avoid this
unfortunate issue.
The second change here does a double loop over the yaml files. Bear with
me...
Our tests dictate that we need to load an environment before our rake
tasks because we could have something in an environment that the
database.yml depends on. There are side-effects to this and I think
there's a deeper bug that needs to be fixed but that's for another
issue. The gist of the problem is when I was creating the dynamic rake
tasks if the yaml that that rake task is calling evaluates code (like
erb) that calls the environment configs the code will blow up because
the environment is not loaded yet.
To avoid this issue we added a new method that simply loads the yaml and
does not evaluate the erb or anything in it. We then use that yaml to
create the task name. Inside the task name we can then call
`load_config` and load the real config to actually call the code
internal to the task. I admit, this is gross, but refactoring can't all
be pretty all the time and I'm working hard with `@tenderlove` to
refactor much more of this code to get to a better place re connection
management and rake tasks.
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Adds the ability to dump the schema or structure files for mulitple
databases. Loops through the configs for a given env and sets a filename
based on the format, then establishes a connection for that config and
dumps into the file.
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`each_current_configuration` is used by create, drop, and other methods
to find the configs for a given environment and returning those to the
method calling them.
The change here allows for the database commands to operate on all the
configs in the environment. Previously we couldn't slice the hashes and
iterate over them becasue they could be two tier or could be three
tier. By using the database config structs we don't need to care whether
we're dealing with a three tier or two tier, we can just parse all the
configs based on the environment.
This makes it possible for us to run `bin/rails db:create` and it will
create all the configs for the dev and test environment ust like it does
for a two tier - it creates the db for dev and test. Now `db:create`
will create `primary` for dev and test, and `animals` for dev and test
if our database.yml looks like:
```
development:
primary:
etc
animals:
etc
test:
primary:
etc
animals:
etc
```
This means that `bin/rails db:create`, `bin/rails db:drop`, and
`bin/rails db:migrate` will operate on the dev and test env for both
primary and animals ds.
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If we have a three-tier yaml file like this:
```
development:
primary:
database: "development"
animals:
database: "development_animals"
migrations_paths: "db/animals_migrate"
```
This will add db create/drop/and migrate tasks for each level of the
config under that environment.
```
bin/rails db:drop:primary
bin/rails db:drop:animals
bin/rails db:create:primary
bin/rails db:create:animals
bin/rails db:migrate:primary
bin/rails db:migrate:animals
```
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Passing around and parsing hashes is easy if you know that it's a two
tier config and each key will be named after the environment and each
value will be the config for that environment key.
This falls apart pretty quickly with three-tier configs. We have no idea
what the second tier will be named (we know the first is primary but we
don't know the second), we have no easy way of figuring out
how deep a hash we have without iterating over it, and we'd have to do
this a lot throughout the code since it breaks all of Active Record's
assumptions regarding configurations.
These methods allow us to pass around objects instead. This will allow
us to more easily parse the configs for the rake tasks. Evenually I'd
like to replace the Active Record connection management that passes
around config hashes to use these methods as well but that's much
farther down the road.
`walk_configs` takes an environment, specification name, and a config
and turns them into DatabaseConfig struct objects so we can ask the
configs questions like:
```
db_config.spec_name
=> animals
db_config.env_name
=> development
db_config.config
{ :adapter => mysql etc }
```
`db_configs` loops through all given configurations and returns an array
of DatabaseConfig structs for each config in the yaml file.
and lastly `configs_for` takes an environment and either returns the
spec name and config if a block is given or returns an array of
DatabaseConfig structs just for the given environment.
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Add custom prefix to ActiveRecord::Store accessors
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Add a prefix option to ActiveRecord::Store.store_accessor and
ActiveRecord::Store.store. This option allows stores to have identical keys
with different accessors.
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The multiple assignments was caused by 37a1dfa due to lost the `to_s`
normalization for given names.
Fixes #32323.
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Use PredicateBuilder for bind params in Relation::Batches
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Using the PredicateBuilder to build the bind
attributes allows Batch to drop its dependency on
Relation::QueryAttribute and Arel::Nodes::BindParam
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The current documentation explicitly mentions only PostgreSQL (hstore/json)
for use with `.store_accessor`, making it somewhat confusing what to choose on
a MySQL 5.7+ setup (which introduced a json data type).
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Fix default connection handling with three-tier config
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If you had a three-tier config, the `establish_connection` that's called
in the Railtie on load can't figure out how to access the default
configuration.
This is because Rails assumes that the config is the first value in the
hash and always associated with the key from the environment. With a
three tier config however we need to go one level deeper.
This commit includes 2 changes. 1) removes a line from `resolve_all`
which was parsing out the the environment from the config so instead of
getting
```
{
:development => {
:primary => {
:database => "whatever"
}
},
:animals => {
:database => "whatever-animals"
}
},
etc with test / prod
}
```
We'd instead end up with a config that had no attachment to it's
envioronment.
```
{
:primary => {
:database => "whatever"
}
:animals => {
:database => "whatever-animals"
}
etc - without test and prod
}
```
Not only did this mean that Active Record didn't know how to establish a
connection, it didn't have the other necessary configs along with it in
the configs list.
So fix this I removed the line that deletes these configs.
The second thing this commit changes is adding this line to
`establish_connection`
```
spec = spec[spec_name.to_sym] if spec[spec_name.to_sym]
```
When you have a three-tier config and don't pass any hash/symbol/env etc
to `establish_connection` the resolver will automatically return both
the primary and secondary (in this case animals db) configurations.
We'll get an `database configuration does not specify adapter` error
because AR will try to establish a connection on the `primary` key
rather than the `primary` key's config. It assumes that the
`development` or default env automatically will return a config hash,
but with a three-tier config we actually get a key and config `primary
=> config`.
This fix is a bit of a bandaid because it's not the "correct" way to
handle this situation, but it does solve our immediate problem. The new
code here is saying "if the config returned from the resolver (I know
it's called spec in here but we interchange our meanings a LOT and what
is returned is a three-tier config) has a key matching the "primary"
spec name, grab the config from the spec and pass that to the
estalbish_connection method".
This works because if we pass `:animals` or a hash, or `:primary` we'll
already have the correct configuration to connect with.
This fixes the case where we want Rail to connect with the default
connection.
Coming soon is a refactoring that should eliminate the need to do this
but I need this fix in order to write the multi-db rake tasks that I
promised in my RailsConf submission. `@tenderlove` and I are working on
the refactoring of the internals for connection management but it won't
be ready for a few weeks and this issue has been blocking progress.
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[ci skip]
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lsylvester/only-preload-misses-on-multifetch-cache
Only preload misses on multifetch cache
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In #24542, quoted_time was introduced to strip the leading date
component for time columns because it was having a significant
effect in mariadb. However, it assumed that the date component
was always 2000-01-01 which isn't the case, especially if the
source wasn't another time column.
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For legacy reasons Rails stores time columns on sqlite as full
timestamp strings. However because the date component wasn't being
normalized this meant that when they were read back they were being
prefixed with 2001-01-01 by ActiveModel::Type::Time. This had a
twofold result - first it meant that the fast code path wasn't being
used because the string was invalid and second it was corrupting the
second fractional component being read by the Date._parse code path.
Fix this by a combination of normalizing the timestamps on writing
and also changing Active Model to be more lenient when detecting
whether a string starts with a date component before creating the
dummy time value for parsing.
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yujideveloper/feature/delegate-ar-base-pick-to-all
Add `delegate :pick, to: :all`
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This reverts commit a19e91f0fab13cca61acdb1f33e27be2323b9786.
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