Is all this information in MongoDB? Do you know about mapReduce? mapReduce
would be your friend there.
Even if all this information is in-memory, a similar map-reduce approach
could be done.
In essence:
- map phase - for all items, emit the entry in the above format (even with
empty values where you don't have anything)
- reduce phase - take the items that have the same key ({rid: {id: '123'}}
I guess in your case) - and merge the items arrays.
Except, you want two different layers - so you need two map-reduce runs,
and map should be chained onto a filter (that makes sure you have either
form or format).
Zlatko
On Thursday, November 26, 2015 at 2:48:41 AM UTC+1, Diego Mayorga wrote:
>
> Hi all, i'm trying to do this, I have an array that looks like this:
>
> [ { rId: { id: '123455667' },
> form: 'layer',
> timeStamp: '2015-11-20T10:28:26-03:00',
> exa: '32144B5A0000200000000001' },
> { rId: { id: '123455667'},
> form: 'item',
> timeStamp: '2015-11-20T10:28:28-03:00',
> exa: '30142F13F0138D0000000057' },
> { rId: { id: '123455667' },
> format: 'item',
> timeStamp: '2015-11-20T10:28:27-03:00',
> exa: '30142F13F0138D0000000054' },
> { rId: { id: '123455667' },
> format: 'layer',
> timeStamp: '2015-11-20T10:29:09-03:00',
> exa: '32144B5A00002000000001AB' },
> { rId: { id: '123455667' },
> form: 'item',
> timeStamp: '2015-11-20T10:30:19-03:00',
> exa: '30142F13F0138D0000000055' } ]
>
> And I want to create to separete arrayas that look likes:
>
> [ { rId: { id: '123455667' },
> form: 'layer',
> timeStamp: '2015-11-20T10:28:26-03:00',
> exa: '32144B5A0000200000000001' },
> items: [
> { rId: { id: '123455667'},
> form: 'item',
> timeStamp: '2015-11-20T10:28:28-03:00',
> exa: '30142F13F0138D0000000057' },
> { rId: { id: '123455667' },
> format: 'item',
> timeStamp: '2015-11-20T10:28:27-03:00',
> exa: '30142F13F0138D0000000054' }
> ]
> ]
> [ { rId: { id: '123455667' },
> format: 'layer',
> timeStamp: '2015-11-20T10:29:09-03:00',
> exa: '32144B5A00002000000001AB' },
> items: [
> { rId: { id: '123455667' },
> form: 'item',
> timeStamp: '2015-11-20T10:30:19-03:00',
> exa: '30142F13F0138D0000000055' }
> ]
> ]
>
> So in simple words, if there are two elements with format layer add
> elements with format item to the first element with format layer and those
> who are after the second layer to the second layer, and in the event that
> there is only one layer add all items formatted items to that layer
>
> This may be silly but do not know where to start.
>
> Thanks.
>
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