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From Robert Newson <>
Subject Re: list functions, error checking, and content-type
Date Fri, 22 Feb 2013 18:51:18 GMT
The 1.3.0 release process has begun, so it'll be next after that.

On 22 February 2013 18:45, Kevin R. Coombes <> wrote:
> Thanks; yes, it sounds exactly like that issue.
>  If I read the "JIRA issues" page correctly, this problem is fixed as of
> version 1.4.  Since the current stable release is 1.2.1, is there some
> (broad and clearly not binding...) estimate of when 1.4 might be available
> and usable by mere mortals?
> On 2/22/2013 11:17 AM, Robert Newson wrote:
>> Sounds like
>> On 22 February 2013 17:12, Kevin R. Coombes<>
>> wrote:
>>> Hi,
>>> I am currently using CouchDB 1.2.0 on a Windows 7 machine. I have a
>>> database
>>> with several different view functions, and I am trying to define a list
>>> function that only makes sense when combined with _some_ of the views.
>>> Under
>>> the (not unrealistic) assumption that anything that a user *can* do,
>>> sooner
>>> or later, someone *will* do, I'd like the list function to check that the
>>> view it is being called with actually makes sense.  If not, then I want
>>> to
>>> use the HTTP response to send an error message, with a proper error code.
>>> My first (failed) attempt looked something like this:
>>> function(header, request) {
>>>    var row = getRow();
>>>    if (row.hasRequiredField) {
>>>      start({"headers": "Content-Type": "text/html"});
>>>      // do what you need to do to 'send' this and all other rows
>>>    } else {
>>>      start({"code" 400, "headers": {"Content-Type": "text/html"}});
>>>      send("Helpful error message explaining the problem.");
>>> }
>>> This fails because the first call to "getRow" starts writing the HTTP
>>> response and sets the Content-Type to "application/json".  Thus the later
>>> "start" calls fail to set the Content-Type or the response code.
>>> The only alternative I can think of at this point is to peek into the
>>> "request" argument to see if I can tell if the request is valid.  But I
>>> think the only information I can get that might be relevant is the name
>>> of
>>> the view (by parsing the path element), and that causes difficulties with
>>> maintaining the application over time.  I must either maintain a "white
>>> list" of known acceptable views or a "black list" of known unacceptable
>>> views. (And, applying the user principle above to the
>>> developer/maintainer,
>>> I know that I will forget to update this list at some point in time.)
>>> I found a StackOverflow question about this issue from September 2011
>>> (,
>>> but since the issue still exists, I assume that change either never got
>>> requested in JIRA or never got implemented.
>>> Is there some other way to accomplish what I want? Or do I have to give
>>> up
>>> on sending proper error codes and just set the Content-Type globally
>>> before
>>> calling getRow?  Or should I put the issue into JIRA and hope someone
>>> fixes
>>> it?
>>> Thanks,
>>>      Kevin

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