[Pharo-dev] Json case: Mapping objects to dictionaries

Norbert Hartl norbert at hartl.name
Thu Dec 5 10:44:13 EST 2013


What would be the best software to map my objects to dictionaries? There are a lot of packages in pharo that deal with JSON somehow. But it seems none does mapping from objects to dictionaries and is standalone. We’ve got

- NeoJSON package . Maps objects to strings directly for performance reason
- JSON package. Maps string to JsonObject (subclassed from dictionary)
- Voyage magritte based mapper: Closest to what I find useful but buried inside of Voyage. And I’m not sure it would be easy to factor out this module as a standalone mapper.
- Seaside javascript… : I forgot what it really does. I often shy away looking at it because I don’t want to suck in all the dependencies. 

I’m asking because for me this is an important asset. If we talk about JSON there are three things: Objects, JSON structure (being dictionaries and other collections in pharo) and JSON strings. Writing to another server or to a file producing JSON strings seems to be enough. But using it for another system like MongoDB or ElasticSearch this does not work. Here the common interface seems to be dictionaries. With ElasticSearch mapping dictionaries to JSON and MongoDB mapping dictionaries to BSON. So a good descriptive way to map objects to dictionaries would be a good thing to have.

Any thoughts?

Norbert



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