| Commit message (Collapse) | Author | Age | Files | Lines |
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In our app at work we had a faked config like this:
```
{ "foo" => :bar, "bar" => { "adapter" => "memory" } }
```
This config is invalid. You can't say for foo env just have a symbol,
nor would this work if you had fa foo env with just a string. A
configuration must be a url or an adapter or a database. Otherwise it's
invalid and we can't parse it.
When this was just yaml turned into hashes you could get away with
passing whatever. It wouldn't work but it wouldn't blow up either.
Now that we're using objects we were returning `nil` for these but that
just means we either blow up on `for_current_env` or compact the
`nil`'s.
I think it's a better user experience to not build the configs and raise
an appropriate error.
This is also an invalid config because if you do pass a string here it
should be a URL.
```
{ "foo" => "bar", "bar" => { "adapter" => "memory" } }
```
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This commit adds a feature which allows separate database ENV variables
to be defined for each spec in a 3-tier config. The names for the
environment variables will be `#{name.upcase}_DATABASE_URL`
This commit also introduces a change in behavior around handling of
`DATABASE_URL`. Instead of using `DATABASE_URL` to change _all_ specs
in a multi-database configuration, it will now only affect the `primary`
connection.
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This commit fixes a regression where when the `DATABASE_URL` environment
variable was set and the current Rails environment had a valid configuration
defined in the database config, settings from the environment variable would
affect _all_ environments (not just the current one).
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This commit fixes an issue where multi-database configurations were
incompatible with setting a `DATABASE_URL` environment variable.
As part of this work, this commit also includes a light refactor
to make both multi and single database configurations lead into the same
code path so they behave the same.
As mentioned in #36736, this regression was introduced as part of
f2ad69fe7a605b01bb7c37eeac6a9b4e7deb488e
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fixes #36610
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`enum` and `set` are typed cast as `:string`, but currently the
`:string` type is incorrectly reused for schema dumping.
A cast type on columns is not always the same with `sql_type`, this
fixes schema dumping `enum` and `set` columns to use `sql_type` instead
of `type` correctly.
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This PR is to fix #36559 but I also found other issues that haven't been
reported.
The check for `(config.size == 1 && config.values.all? { |v| v.is_a?
String })` was naive. The only reason this passed was because we had
tests that had single hash size configs, but that doesn't mean we don't
want to create a hash config in other cases. So this now checks for
`config["database"] || config["adapter"] || ENV["DATABASE_URL"]`. In the
end for url configs we still get a UrlConfig but we need to pass through
the HashConfig to create the right kind of UrlConfig. The UrlConfig's
are really complex and I don't necessarily understand everything that's
needed in order to act the same as Rails 5.2.
I edited the connection handler test to demonstrate how the previous
implementation was broken when checking config size. Now old and new
tests pass so I think this is closer to 5.2.
Fixes #36559
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We sometimes say "✂️ newline after `private`" in a code review (e.g.
https://github.com/rails/rails/pull/18546#discussion_r23188776,
https://github.com/rails/rails/pull/34832#discussion_r244847195).
Now `Layout/EmptyLinesAroundAccessModifier` cop have new enforced style
`EnforcedStyle: only_before` (https://github.com/rubocop-hq/rubocop/pull/7059).
That cop and enforced style will reduce the our code review cost.
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When someone has a multi-db application their `ApplicationRecord` will
look like:
```ruby
class ApplicationRecord < ActiveRecord::Base
self.abstract_class = true
connects_to database: { writing: :primary, reading: :replica }
end
```
This will cause us to open 2 connections to ActiveRecord::Base's
database when we actually only want 1. This is because Rails sees
`ApplicationRecord` and thinks it's a new connection, not the existing
`ActiveRecord::Base` connection because the
`connection_specification_name` is different.
This PR changes `ApplicationRecord` classes to consider themselves the
same as the "primary" connection.
Fixes #36382
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Cache full MySQL version in schema cache
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* The database version is cached in all the adapters, but this didn't include
the full MySQL version. Anything that uses the full MySQL version would need
to query the database to get that data even if they're using the schema
cache.
* Now the full MySQL version will be cached in the schema cache via the
Version object.
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Performance cops will be extracted from RuboCop to RuboCop Performance
when next RuboCop 0.68 will be released.
https://github.com/rubocop-hq/rubocop/issues/5977
RuboCop 0.67 is its transition period.
Since rails/rails repository uses Performance cops, This PR added
rubocop-performance gem to Gemfile.
And this PR fixes some offenses using the following auto-correct.
```console
% bundle exec rubocop -a
Offenses:
activerecord/test/cases/connection_adapters/connection_handlers_multi_db_test.rb:212:26:
C: [Corrected] Layout/SpaceAroundOperators: Operator =
> should be surrounded by a single space.
"primary" => { adapter: "sqlite3", database: "db/primary.sqlite3" }
^^
activerecord/test/cases/connection_adapters/connection_handlers_multi_db_test.rb:239:26:
C: [Corrected] Layout/SpaceAroundOperators: Operator => should be
surrounded by a single space.
"primary" => { adapter: "sqlite3", database: "db/primary.sqlite3" }
^^
actionview/test/template/resolver_shared_tests.rb:1:1: C: [Corrected]
Style/FrozenStringLiteralComment: Missing magic comment #
frozen_string_literal: true.
module ResolverSharedTests
^
actionview/test/template/resolver_shared_tests.rb:10:33: C: [Corrected]
Layout/SpaceAroundEqualsInParameterDefault: Surrounding space missing in
default value assignment.
def with_file(filename, source="File at #{filename}")
^
actionview/test/template/resolver_shared_tests.rb:106:5: C: [Corrected]
Rails/RefuteMethods: Prefer assert_not_same over refute_same.
refute_same a, b
^^^^^^^^^^^
2760 files inspected, 5 offenses detected, 5 offenses corrected
```
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After looking at #35800 there is definitely an issue in the
`connected_to` method although it's generally behaving. Here are the
details:
1) I added a default connection role - writing - to the connection
handler lookup. I did this because otherwise if you did this:
```
connected_to(databse: :development)
```
And development wasn't a pre-established role it would create a new
handler and connect using that. I don't think this is right so I've
updated it to pick up the default (:writing) unless otherwise specified.
To set a handler when using the database version pass a hash like you
would to `connects_to`:
```
connected_to(database: { readonly_slow: :development })
```
This will connect the `development` database to the `readonly_slow`
handler/role.
2) I updated the tests to match this behavior that we expect.
3) I updated the documentation to clarify that using `connected_to` with
a `database` key will establish a new connection every time. This is
exactly how `establish_connection` behaves and I feel this is correct.
If you want to only establish a connection once you should do that in
the model with `connects_to` and then swap on the role instead of on the
database hash/key.
4) In regards to #35800 this fixes the case where you pass a symbol to
the db and not a hash. But it doesn't fix a case where you may pass an
unknown handler to an abstract class that's not connected. This is
tricky because technical AbstractFoo doesn't have any connections except
for through ApplicationRecord, so in the case of the application that
was shared we should only be swapping connections on ActiveRecord::Base
because there are no other actual connections - AbstractFoo isn't needed
since it's not establishing a new connection. If we need AbstractFoo to
connect to a new handler we should establish that connection with the
handler in AbstractFoo before trying to shard there.
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* The database version will get cached in the schema cache file during the
schema cache dump. When the database version check happens, the version will
be pulled from the schema cache and thus avoid querying the database for
the version.
* If the schema cache file doesn't exist, we'll query the database for the
version and cache it on the schema cache object.
* To facilitate this change, all connection adapters now implement
#get_database_version and #database_version. #database_version returns the
value from the schema cache.
* To take advantage of the cached database version, the database version check
will now happen after the schema cache is set on the connection in the
connection pool.
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This reverts commit 65f2eeaaf5774f0891fff700f4defb0b90a05789.
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Useful to not query for indexes when an application uses schema cache.
Ref https://github.com/rails/rails/pull/35546
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YAML has been used to serialize the schema cache ever since 2016 with
Rails 5.1: 4c00c6ed
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When I wrote the `connected_to` and `connects_to` API's I wrote them
with the idea in mind that it didn't really matter what the
handlers/roles were called as long as those connecting to the roles knew
which one wrote and which one read.
With the introduction of the middleware Rails begins to assume it's
`writing` and `reading` and there's no room for other roles. At GitHub
we've been using this method for a long time so we have a ton of legacy
code that uses different handler names `default` and `readonly`. We
could rename all our code but I think this is better for a few reasons:
- Legacy apps that have been using multiple databases for a long time
can have an eaiser time switching.
- If we later find this to cause more issues than it's worth we can
easily deprecate.
- We won't force old apps to rewrite the resolver middleware just to use
a different handler.
Adding the writing_role/reading_role required that I move the code that
creates the first handler for writing to the railtie. If I didn't move
this the core class would assign the handler before I was able to assign
a new one in my configuration and I'd end up with 3 handlers instead of
2.
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Previously if the `url` key in a config hash was nil we'd ignore the
configuration as invalid. This can happen when you're relying on a
`DATABASE_URL` in the env and that is not set in the environment.
```
production:
<<: *default
url: ENV['DATABASE_URL']
```
This PR fixes that case by checking if there is a `url` key in the
config instead of checking if the `url` is not nil in the config.
In addition to changing the conditional we then need to build a url hash
to merge with the original hash in the `UrlConfig` object.
Fixes #35091
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While working on another feature for multiple databases (auto-switching)
I observed that in development the first request won't autoload the
application record connection for the primary database and may not yet
know about the replica connection.
In my test application this caused the application to thrown an error if
I tried to send the first request to the replica before the replica was
connected. This wouldn't be an issue in production because the
application is preloaded.
In order to fix this I decided to leave the original error message and
delete the new error message. I updated the original error message to
include the `role` to make it a bit clearer that the connection isn't
established for that particular role.
The error now reads:
```
No connection pool with 'primary' found for the 'reading' role.
```
A single database application will continue uisng the original error
message:
```
No connection pool with 'primary' found.
```
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Only define attribute methods from schema cache
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To define the attribute methods for a model, Active Record needs to know
the schema of the underlying table, which is usually achieved by making
a request to the database. This is undesirable behaviour while the app
is booting, for two reasons: it makes the boot process dependent on the
availability of the database, and it means every new process will make
one query for each table, which can cause issues for large applications.
However, if the application is using the schema cache dump feature, then
the schema cache already contains the necessary information, and we can
define the attribute methods without causing any extra database queries.
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Since the `current_role` is public API.
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If you try to call `connected_to` with a role that doesn't have an
established connection you used to get an error that said:
```
>> ActiveRecord::Base.connected_to(role: :i_dont_exist) { Home.first }
ActiveRecord::ConnectionNotEstablished Exception: No connection pool
with 'primary' found.
```
This is confusing because the connection could be established but we
spelled the role wrong.
I've changed this to raise if the `role` used in `connected_to` doesn't
have an associated handler. Users who encounter this should either check
that the role is spelled correctly (writin -> writing), establish a
connection to that role in the model with connects_to, or use the
`database` keyword for the `role`.
I think this will provide a less confusing error message for those
starting out with multiple databases.
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This can be used to check the currently connected role. It's meant to
mirror AR::Base.connected_to
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The connection handler was using the RuntimeRegistry which kind of
implies it's a per thread registry. But it's actually per fiber.
If you have an application that uses fibers and you're using multiple
databases, when you switch the connection handler to swap connections
new fibers running on the same thread used to get a different connection
id. This PR changes the code to actually use a thread so that we get
the same connection.
Fixes https://github.com/rails/rails/issues/30047
[Eileen M. Uchitelle, Aaron Patterson, & Arthur Neeves]
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Since both methods are public API I think it makes sense to add these tests
in order to prevent any regression in the behavior of those methods after the 6.0 release.
Exercise `connected_to`
- Ensure that the method raises with both `database` and `role` arguments
- Ensure that the method raises without `database` and `role`
Exercise `connects_to`
- Ensure that the method returns an array of established connections(as mentioned
in the docs of the method)
Related to #34052
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connection
Related to #34052
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Add support for hash and url configs in database hash
of `ActiveRecord::Base.connected_to`.
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This PR adds the ability to 1) connect to multiple databases in a model,
and 2) switch between those connections using a block.
To connect a model to a set of databases for writing and reading use
the following API. This API supercedes `establish_connection`. The
`writing` and `reading` keys represent handler / role names and
`animals` and `animals_replica` represents the database key to look up
the configuration hash from.
```
class AnimalsBase < ApplicationRecord
connects_to database: { writing: :animals, reading: :animals_replica }
end
```
Inside the application - outside the model declaration - we can switch
connections with a block call to `connected_to`.
If we want to connect to a db that isn't default (ie readonly_slow) we
can connect like this:
Outside the model we may want to connect to a new database (one that is
not in the default writing/reading set) - for example a slow replica for
making slow queries. To do this we have the `connected_to` method that
takes a `database` hash that matches the signature of `connects_to`. The
`connected_to` method also takes a block.
```
AcitveRecord::Base.connected_to(database: { slow_readonly: :primary_replica_slow }) do
ModelInPrimary.do_something_thats_slow
end
```
For models that are already loaded and connections that are already
connected, `connected_to` doesn't need to pass in a `database` because
you may want to run queries against multiple databases using a specific
role/handler.
In this case `connected_to` can take a `role` and use that to swap on
the connection passed. This simplies queries - and matches how we do it
in GitHub. Once you're connected to the database you don't need to
re-connect, we assume the connection is in the pool and simply pass the
handler we'd like to swap on.
```
ActiveRecord::Base.connected_to(role: :reading) do
Dog.read_something_from_dog
ModelInPrimary.do_something_from_model_in_primary
end
```
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Since #33968 we stringify keys of database configuration
This commit adds more assertions in order to ensure that and prevent any
regression in the future.
Currently, if remove `to_s` added in #33968 from `env_name.to_s` on the
line
(activerecord/lib/active_record/database_configurations.rb:107), there is
no test that would fail. One of the added assertions should emphasize why we need
this `to_s`.
Follow up #33968
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While the three-tier config makes it easier to define databases for
multiple database applications, it quickly became clear to offer full
support for multiple databases we need to change the way the connections
hash was handled.
A three-tier config means that when Rails needed to choose a default
configuration (in the case a user doesn't ask for a specific
configuration) it wasn't clear to Rails which the default was. I
[bandaid fixed this so the rake tasks could work](#32271) but that fix
wasn't correct because it actually doubled up the configuration hashes.
Instead of attemping to manipulate the hashes @tenderlove and I decided
that it made more sense if we converted the hashes to objects so we can
easily ask those object questions. In a three tier config like this:
```
development:
primary:
database: "my_primary_db"
animals:
database; "my_animals_db"
```
We end up with an object like this:
```
@configurations=[
#<ActiveRecord::DatabaseConfigurations::HashConfig:0x00007fd1acbded10
@env_name="development",@spec_name="primary",
@config={"adapter"=>"sqlite3", "database"=>"db/development.sqlite3"}>,
#<ActiveRecord::DatabaseConfigurations::HashConfig:0x00007fd1acbdea90
@env_name="development",@spec_name="animals",
@config={"adapter"=>"sqlite3", "database"=>"db/development.sqlite3"}>
]>
```
The configurations setter takes the database configuration set by your
application and turns them into an
`ActiveRecord::DatabaseConfigurations` object that has one getter -
`@configurations` which is an array of all the database objects.
The configurations getter returns this object by default since it acts
like a hash in most of the cases we need. For example if you need to
access the default `development` database we can simply request it as we
did before:
```
ActiveRecord::Base.configurations["development"]
```
This will return primary development database configuration hash:
```
{ "database" => "my_primary_db" }
```
Internally all of Active Record has been converted to use the new
objects. I've built this to be backwards compatible but allow for
accessing the hash if needed for a deprecation period. To get the
original hash instead of the object you can either add `to_h` on the
configurations call or pass `legacy: true` to `configurations.
```
ActiveRecord::Base.configurations.to_h
=> { "development => { "database" => "my_primary_db" } }
ActiveRecord::Base.configurations(legacy: true)
=> { "development => { "database" => "my_primary_db" } }
```
The new configurations object allows us to iterate over the Active
Record configurations without losing the known environment or
specification name for that configuration. You can also select all the
configs for an env or env and spec. With this we can always ask
any object what environment it belongs to:
```
db_configs = ActiveRecord::Base.configurations.configurations_for("development")
=> #<ActiveRecord::DatabaseConfigurations:0x00007fd1acbdf800
@configurations=[
#<ActiveRecord::DatabaseConfigurations::HashConfig:0x00007fd1acbded10
@env_name="development",@spec_name="primary",
@config={"adapter"=>"sqlite3", "database"=>"db/development.sqlite3"}>,
#<ActiveRecord::DatabaseConfigurations::HashConfig:0x00007fd1acbdea90
@env_name="development",@spec_name="animals",
@config={"adapter"=>"sqlite3", "database"=>"db/development.sqlite3"}>
]>
db_config.env_name
=> "development"
db_config.spec_name
=> "primary"
db_config.config
=> { "adapter"=>"sqlite3", "database"=>"db/development.sqlite3" }
```
The configurations object is more flexible than the configurations hash
and will allow us to build on top of the connection management in order
to add support for primary/replica connections, sharding, and
constructing queries for associations that live in multiple databases.
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At the moment these two ActiveRecord tests pass with `rake test:sqlite3`,
but fail with `ARCONN=sqlite3 bin/test`.
`Rails.root` is defined when running `bin/test`, but not when running
the rake task. When `Rails.root` is defined, `config[:database]` will
look something like `vagrant/rails/activerecord/db/primary.sqlite3`
instead of just `db/primary.sqlite3`.
(See https://github.com/rails/rails/blob/00caf95e14b90782ab17fbd6d2b930844df99980/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb#L27)
Relaxing `assert_equal` to `assert_match` will allow these tests to pass
regardless of how they are run.
I do have a question why we need both ways to run tests. I have been
using `bin/test` lately, but I see from #32426 that this is not the preferred
method.
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73e7aab behaved as expected on codeship, failing the build with
exactly these RuboCop violations. Hopefully `rubocop -a` will
have been enough to get a passing build!
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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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It doesn't have to do anything, but it shouldn't fail.
Fixes #31766.
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When removing a record from a has many through association, the counter
cache was being updated even if the through record halted the callback
chain and prevented itself from being destroyed.
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Commit 4ec5b0d was for fixing the regression #18787, but #28379 fixes
#18787 as well. So 4ec5b0d is no longer necessary.
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And prefer `assert_same` over `assert_equal`.
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Use whatever adapter-provided means we have available to ensure forked
children don't send quit/shutdown/goodbye messages to the server on
connections that belonged to their parent.
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Make `type_map` to private because it is only used in the connection adapter
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`type_map` is an internal API and it is only used in the connection
adapter. And also, some type map initializer methods requires passed
`type_map`, but those instances already has `type_map` in itself.
So we don't need explicit passing `type_map` to the initializers.
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