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Date: Fri, 17 Sep 2010 06:56:32 -0700
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Subject: Re: Conditional joins
From: Kenneth Tyler <ken@8thfold.com>
To: user@couchdb.apache.org
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Simon,
I think this is a case where the flat document structure of couch documents
makes things much simpler than in SQL.

If you had a view like this:
function(doc){if(doc.type=='user'){emit(doc.status,doc)}
then it would return all the user documents with their status as their key
and you could use ?key="1" (i think the quotes are necessary) to get all the
users whose status is 1

if you want to do the same thing for domains, you just write a "domain" view
that returns status as the key

ken tyler

On Fri, Sep 17, 2010 at 6:04 AM, Simon Woodhead
<simon.woodhead@simwood.com>wrote:

> Hi folks,
>
> I'm pretty green with views and have a need to do a join with results
> from one side returned if a condition is met on the other. In SQL I'd
> do:
>
> select * from child join parent on child.id=parent.id where
> parent.status=1;
>
> I've read the 'join' documentation (e.g.
> http://www.cmlenz.net/archives/2007/10/couchdb-joins) and can return
> documents of multiple types with matching keys ok. What I can't do is
> do the same but only if the parent matches a condition.
>
> Specifically, my data is like:
>
>
> {"45a6951b34a6f45bd44fd169c0003f9c","_rev":"1-6c88818b43d562c45e452bf00db06ee2","type":"domain","domain":"
> test.com","status":1},
>
> {"_id":"45a6951b34a6f45bd44fd169c00046db","_rev":"1-37eaf0c4944dac9f5fe07b25c0b68b1d","type":"domain","domain":"
> test2.com","status":0},
>
> {"_id":"45a6951b34a6f45bd44fd169c00053d9","_rev":"3-729f46c86ee4984941939c65787126fb","type":"user","domain":"
> test.com","user":"foo","password":"test123"},
>
> {"_id":"45a6951b34a6f45bd44fd169c00060c8","_rev":"1-46997eba12e7adbb6e9266a1fe83c42d","type":"user","domain":"
> test2.com","user":"bar","password":"test123"}
>
> I want to be be able to query a view by domain and see all users for
> it if the status is 1. So in this case I'd see users for test.com but
> not for test2.com.
> Any help would be appreciated.
>
> Thanks!
> Simon
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