Converting back and forth between ObjectIds

[kescobo]

MongoDB uses ObjectId in _id field, and it's useful to use these to refer to genes/hits in the database, since these are by definition unique and look-up is incredibly fast. But, when writing genes out to fasta files, ObjectIds are written as strings, and I failed to convert them back into ObjectId when putting them into blast_results database. There might be other places where this mistake was made as well, and there are a bunch of places where I'm converting the string representation to ObjectId and back again.

All uses should be the same, so I think any time these identifiers are in the database, they should be represented by ObjectIds, not strings. The only time conversion should happen is when they're written to files or pulled in from files.

[kescobo]

No longer relevant

[kescobo]

It occurs to me that this isn't actually solved. Will get to this once I get unit tests set up to make things a bit more straightforward.