add support for and_ and or_ conjunctions in sqla expressions

[toxsick]

The sqla query syntax is much more advanced in comparison to the ast syntax. One thing missing is the ability to use conjunctions for more complex queries. Here is my shot on this. It will allow you to make queries like:

http://127.0.0.1:5000/people?where={"and_": [{"age": "__gt__(10)"}, {"age": "__lt__(20)"}]}
http://127.0.0.1:5000/people?where={"or_": [{"name": "john", "age": "__gt__(10)"}, {"age": "__lt__(20)"}]}

What do you guys think?

cheers Hannes

[amleczko]

It looks nice. thanks!