Comments (3)
Different gateways use different connections by design, and joining across different connections is not possible. However, there's no check in the code ensuring you don't do that. The results you see are quite random. I'm not sure if rom-sql can generate identifiers that include the database name, it probably can't. We have a similar problem in PG where explicit schemas in resulting SQL are not supported. Once that support is added we can think of a convenient API for MySQL as well
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@flash-gordon Thank you for your kind comment.
If the #405 is merged, the problem will be solved...??
That's because I think the pr will make it possible.
Sequel.qualify("legacy","other_users")
p default_relation.join(Sequel.qualify("legacy", "other_users"), container.gateways[:default][:users][:id] => container.gateways[:legacy][:other_users][:default_id])
from rom-sql.
Hard to tell, I wouldn't hope for it TBH. Problem is we don't have a proper abstraction for schemas (PG, Oracle)/databases (MySQL) in rom-sql itself, making all our attempts to bypass that leaky. That said, having a method (or even a patch) in one's codebase is not a big deal, IMO.
Another approach: DB synonyms may work in MySQL, take a look https://blog.mclaughlinsoftware.com/2013/11/24/mysql-synonym/
from rom-sql.
Related Issues (20)
- Legacy schema
- Multi_insert returns more results than expected in some specific conditions HOT 5
- Attribute methods not available *within* a relation, but are *outside* of a relation HOT 4
- create returns nil for custom primary keys HOT 4
- OVER clause lost from row_number functions. HOT 9
- Postgres Upsert command does not support specifying index predicate for partial unique indices
- Translate symbols in a hash applied to `Relation#where` to attributes HOT 1
- "undefined method `stream'" when trying to use the `:pg_streaming` plugin HOT 2
- Multi-Schema database HOT 1
- Relation#multi_insert fails with blob data HOT 4
- Add a custom `Create` command for sqlite
- Use of projection dsl is not available in Relation#exclude
- Support for ANY in condition DSL HOT 5
- [Migration] schema_migrations and schema_info tables error HOT 2
- Support virtual columns in `union` queries
- Problem with :create command and custom types HOT 2
- `by_pk` causes stack overflow when used with single primary key while table define composite primary key
- SQLite doesn't cast 1/0 to true and false HOT 5
- Relation#last removes combines HOT 1
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