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This argument was added in fa5a028ed9f, and #34137 but hasn't been used.
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Adds support for multiple databases to `rails db:schema:cache:dump`
and `rails db:schema:cache:clear`.
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Changes the `configs_for` method from using traditional arguments to
using kwargs. This is so I can add the `include_replicas` kwarg without
having to always include `env_name` and `spec_name` in the method call.
`include_replicas` defaults to false because everywhere internally in
Rails we don't want replicas. `configs_for` is for iterating over
configurations to create / run rake tasks, so we really don't ever need
replicas in that case.
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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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This autocorrects the violations after adding a custom cop in
3305c78dcd.
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Before:
```
$ ruby -v
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]
$ ruby -w -Itest -Ilib -I../activesupport/lib -I../actionpack/lib -I../actionview/lib -I../activemodel/lib test/application/rake/multi_dbs_test.rb
Run options: --seed 28744
F
Failure:
ApplicationTests::RakeTests::RakeMultiDbsTest#test_db:migrate_and_db:structure:dump_and_db:structure:load_works_on_all_databases [test/application/rake/multi_dbs_test.rb:70]:
Expected /CREATE TABLE \"books\"/ to match "CREATE TABLE IF NOT EXISTS \"schema_migrations\" (\"version\" varchar NOT NULL PRIMARY KEY);\nCREATE TABLE IF NOT EXISTS \"ar_internal_metadata\" (\"key\" varchar NOT NULL PRIMARY KEY, \"value\" varchar, \"created_at\" datetime NOT NULL, \"updated_at\" datetime NOT NULL);\nCREATE TABLE IF NOT EXISTS \"books\" (\"id\" integer PRIMARY KEY AUTOINCREMENT NOT NULL, \"title\" varchar, \"created_at\" datetime NOT NULL, \"updated_at\" datetime NOT NULL);\nCREATE TABLE sqlite_sequence(name,seq);\nINSERT INTO \"schema_migrations\" (version) VALUES\n('20180416201805');\n\n\n".
```
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I realized I wasn't really testing some of the new rake tasks added so I
built out this new test that uses a multi-db database.yml and allows us
to run create/drop/migrate/schema:dump/schema:load and those that are
namespaced like create:animals. This will make our testing more robust
so we can catch problems quicker and set a good place to add future
tests as these features evolve.
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