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TouchDB iOS - The operation couldn't be completed. Conflict
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Pulkit Singhal  
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 More options Nov 18 2012, 7:12 pm
From: Pulkit Singhal <pulkitsing...@gmail.com>
Date: Sun, 18 Nov 2012 16:12:25 -0800 (PST)
Local: Sun, Nov 18 2012 7:12 pm
Subject: TouchDB iOS - The operation couldn't be completed. Conflict
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I have a scenario where just like GrocerySync, you can checkuncheck items
from lists.

If I do this too fast then I get back an op.error saying:
The operation couldn't be completed. Conflict

That's fair, I guess ... but now I wonder what should I do about it.

Does it make sense to lock up the entire table view until a successful
response comes back?
May be just lock-up that table row or that checkmark toggling control?

Just looking to brainstorm on an effective UX in this thread (initially).


 
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Jens Alfke  
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 More options Nov 18 2012, 8:16 pm
From: Jens Alfke <j...@couchbase.com>
Date: Sun, 18 Nov 2012 17:16:39 -0800
Local: Sun, Nov 18 2012 8:16 pm
Subject: Re: TouchDB iOS - The operation couldn't be completed. Conflict
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On Nov 18, 2012, at 4:12 PM, Pulkit Singhal <pulkitsing...@gmail.com> wrote:

> I have a scenario where just like GrocerySync, you can checkuncheck items from lists.
> If I do this too fast then I get back an op.error saying:
> The operation couldn't be completed. Conflict
> That's fair, I guess ... but now I wonder what should I do about it.

A common way to handle a conflict is to read the new revision of the document, reapply your change, and (if the change isn’t now a no-op) retry the PUT. That sounds like the appropriate thing in this case.

I’ve meant to add some support for this to CouchModel, but haven’t had a chance yet.

> Does it make sense to lock up the entire table view until a successful response comes back?
> May be just lock-up that table row or that checkmark toggling control?

That will fix the common case, but it won’t help if the conflict is with an incoming pull replication, since that doesn’t go through the UI.

—Jens


 
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