Add support for .populate({ select: [] })

[anasyb]

The select is being ignored.. getting back the full records instead of just the titles.

Model.find().populate(assoc.alias, { select: ['title']});

Not sure if its only on mongo?

UPDATE @dmarcelino: changed this issue into a feature request.

[tjwebb]

I did not know you could select only certain attributes. Can you point to the docs on this?

[devinivy]

Possibly related to #509, which will be a part of 0.11.

[anasyb]

I have been reading the code which seems to be written as if this is the behaviour... populate.js and deferred.js

The only documentation I found is here

Maybe it's still work in progress?

[anasyb]

Do you guys know when that _insertJoinedResults which contains childRow = _.pick(childRow, select); is supposed to be called? I can't seem to be able to catch it with a breakpoint!

[dmarcelino]

I know waterline supports "populate where": .populate('taxis', { medallion: { '<': 2 }}) (find.populate.where.js#L38) but I think "populate select" would be a new feature.

[devinivy]

If someone thinks this isn't full answered, feel free to reopen. But as of now, there's no select criteria.

[atiertant]

shoud be a feature request

[anasyb]

subscribers: sorry for the buzz :P nothing interesting to read.
Although this was about select, I just wanted to add reference to this issue for anyone landing here... few other things you can do with populate sub-criteria:
https://github.com/balderdashy/waterline/issues/334

[dmarcelino]

Thanks @anasyb, that's valuable information. Some of it is actually in the docs (https://github.com/balderdashy/waterline-docs/blob/master/query.md#populate) but sort is not mentioned. Care to do a PR? 😃 :

Meanwhile at @atiertant's request I've changed this issue into a feature request and reopened it.

[andriussev]

I have created a simple project to test the issue and it seems that waterline with the disk adapter (the default one) does work great with populate's selects.
Switching it out to mysql removes the functionality and the select attribute is ignored.

[dmarcelino]

@nonpc, can you submit a patch to waterline-adapter-tests? There is already a find.populate.where.js suite of tests, so perhaps add a find.populate.select.js in https://github.com/balderdashy/waterline-adapter-tests/tree/master/interfaces/associations/manyToMany