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Ok so apparently you can not just have a `default:` that manually is
merged in with YAML but you can also have a special "shared" config that
is automatically merged.
Example:
```
shared:
adapter: mysql2
host: <%= ENV["DB_HOST"] || "localhost" %>
username: root
connect_timeout: 0
pool: 100
reconnect: true
development:
database: development_db
adapter: mysql2
```
To fix, only create a DatabaseConfig object when an adapter, database,
or URL are present.
The merging behavior for `shared` doesn't work with a 3-tier config. I
don't think it worked before this change either - since Rails doesn't
know which point to merge it in. That's something we may have to fix
with the refactoring I'm working on.
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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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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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