> On May 5, 2015, at 12:53 PM, atom992 <[email protected]> wrote:
> 
> I want to know that If the user's role "role1" has been removed. what happend 
> on my couchbase Lite with document A? will document A be removed(that what I 
> want to do)?

Almost. It'll update document A to a revision with no properties except for 
"_removed":true. 

>     at the same time, I have another question about sync. My sync function 
> based on document A's property P1, If document A have property P1 with the 
> specified value,user B(can be queried by document A) will assign channel1. If 
> document A's property P1 have been removed ,user B should not assign 
> channel1.how should I do to remove channel1 from user B when document A's 
> property P1 have been removed?

I'm not quite sure I understand the question. If the sync function evaluating 
document A calls access( ) to grant user B access to a channel, and then the 
next time document A is updated the sync function doesn't grant user B access, 
then user B will no longer have access to the channel. (Unless there is another 
document that still gives her access, or her account's admin_channels gives her 
access, or she has a role that has access.)

Basically, every document in SG has metadata containing a list of 
user-to-channel grants. That list is rebuild from scratch every time the sync 
function runs. A user's access is computed by merging together the grants from 
all current documents.

—Jens

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