Allow complex conditions

[wuuti]

Summary

It currently seems impossible to finegrain what gitify exports in a partition. (only a "where" on the objects data fields is possible). This is especially useful if you have a large installation where you don't want to integrate everything in your git workflow, but e.g. contexts you are currently developing on.

Step to reproduce

Try, for example, to export only moreGallery data from a certain context. While it is easy to export resources from a context:

where:
      -
        'context_key:IN': [web,exportme]

that is not possible for moregallery images, as these are stored only in relation to the resource they are in. The context_key is (correct for normalized dbs) not stored along with the resource keys in moregallery_image, and so not usable in our where condition on the images.

Expected behavior

So we would need something like

where:
      -
        '<lookup resource>.context_key:IN': [web,exportme]

or the possibility to define a join to get the data for the conditional.

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[Mark-H]

I think joins and complex filters like that are getting kinda out of scope... at the very least you're making your development and workflow very complex too, while it might be better to keep it simple.