Restore the 4.0 behaviour for 'sqlite3:///', but deprecate it. We'll
change to the absolute-path interpretation in 4.2.
The current "correct" spellings for in-memory, relative, and absolute
URLs, respectively, are:
sqlite3::memory:
sqlite3:relative/path
sqlite3:/full/path
Substantially reverses/defers fbb79b517f.
Uncovered by @guilleiguaran while investigating #14495, though that
sounds like a different issue.
Currently a developer can pass in a YAML configuration that fully specifies connection information:
```
production:
database: triage_production
adapter: password
pool: 5
```
They can also pass in a string that specifies a connection URL directly to an environment key:
```
production: postgresql://localhost/foo
```
This PR allows the use of both a connection url and specifying connection attributes via YAML through the use of the "url" sub key:
```
production:
url: postgresql://localhost/foo
pool: 3
```
This will allow developers to inherit Active Record options such as `pool` from `&defaults` and still use a secure connection url such as `<%= ENV['DATABASE_URL'] %>`. The URL is expanded into a hash and then merged back into the YAML hash. If there are any conflicts, the values from the connection URL are preferred.
Talked this over with @josevalim
This commit also cleans up the rake tasks that were checking
for DATABASE_URL in different places.
In fact, it would be nice to deprecate DATABASE_URL usage in the long
term, considering the direction we are moving of allowing those in .yml
files.
the strings true and false into boolean types, in order to match how
YAML would parse the same values from database.yml and prevent
unexpected type errors in the database adapters.
The RFC indicates that username and passwords may be encoded.
http://tools.ietf.org/html/rfc2396#section-3.2.2
Found this trying to use the mysql://username:password@host:port/db and having special characters in the password which needed to be URI encoded.
- added tests to confirm establish_connection uses DATABASE_URL and
Rails.env correctly even when no arguments are passed in.
- updated rake db tasks to support DATABASE_URL, and added tests to
confirm correct behavior for these rake tasks. (Removed
establish_connection call from some tasks since in those cases
the :environment task already made sure the function would be called)
- updated Resolver so that when it resolves the database url, it
removes hash values with empty strings from the config spec (e.g.
to support connection to postgresql when no username is specified).
being able to run the sqlite3 tests without that gem. This fix ensures
the tests will only run if the mysql gem is installed.
A better solution might be to move these tests into the per-adapter tests,
and test each adapter's resolver.
