Fix associations with per-class/multiple database connections

[larskanis]

Current ActiveRecord does not work with per class database connections. It worked with 2.x and 3.0 series.

Here is a simple example, running against the ActiveRecord test database: https://gist.github.com/1388725
It throws ActiveRecord::ConnectionNotEstablished in line 16 without this patch.

The patch applies cleanly to 3-1-stable and master. I verified, that all ActiveRecord tests pass on SQLite and PostgreSQL.

[larskanis]

Is there something I can do, so that someone pays attention to this patch? May I add a test case?

[rickmzp]

+1 on this issue, but the patch needs test cases and it seems like you have a merge commit in there you shouldn't have

[larskanis]

Thanks for responding! I'll try to create a test case for it. In a first try, it turned out to be a bit difficult, because ActiveRecord::Base.connection is always established, so that the wrong connection is used for the assotiations, but no error is raised. Maybe I'll have to look a bit deeper into the test suite.

[rickmzp]

cool, thanks for the info! I'm actually going to give it a shot myself now. it's a bit of a blocker for me with how I'm using AR at the moment. I'll let you know how far I get.

[rickmzp]

Check it out, larskanis: #4953

[larskanis]

It's merged with #5000.