Collection add saves to the database twice

I’ve got something weird happening in the code (using Rails 3.0). I
have a ton of has_many/belongs_to relationships in my application and
I save the child objects like this:

if parent.child_collection << child
#do success code
else
#do error code
end

The problem is that this ends up with duplicate child records in the
database, saved two seconds apart. The weird part is that this
happens when the user is using IE or Chrome, but NOT when using
Firefox. I’m wondering if this is Javascript related (I’m using
jQuery), but I do get two “Success” messages in Firefox even though it
only saves once. The #do success code uses Ajax to put up a view of
the parent object with the children in a table.

Should I explicitly save the child before I add it to the collection?
This code seemed to work just fine before I “AJAX-ified” the
application, but then I always use Firefox for development

On Thu, Mar 10, 2011 at 3:00 PM, danm [email protected] wrote:

The problem is that this ends up with duplicate child records in the
database, saved two seconds apart. The weird part is that this
happens when the user is using IE or Chrome, but NOT when using
Firefox. I’m wondering if this is Javascript related (I’m using
jQuery), but I do get two “Success” messages in Firefox even though it
only saves once. The #do success code uses Ajax to put up a view of
the parent object with the children in a table.

Without seeing some actual code it is hard to tell exactly what the
issue
is. I would, on the suffurace, guess that your AJAX code is submitting
the
same request twice since you are seeing 2 successes in the browser.
Start
there for debugging.

B.

Thanks for the tip about watching development.log, Colin. But now the
mystery
deepens. Using IE 8.0, EVERY AJAX call shows up twice. However,
using the exact same links in Firefox 3.6.14, they only show up once.
I am
tailing the log file and watching it as I click on links in both
browsers and
I can see the duplicate entries going by in real time. It’s happening
for GET,
POST and DELETE requests in IE, but only the ones running through
AJAX.
The same requests in Firefox only run once.

Interestingly, I’m not seeing the double success entries in Firefox
any
longer, but I just updated it this morning. Maybe I’m seeing
something
odd with the new jQuery implementation in 3.0?

On 10 March 2011 21:00, danm [email protected] wrote:

The problem is that this ends up with duplicate child records in the
database, saved two seconds apart. The weird part is that this
happens when the user is using IE or Chrome, but NOT when using
Firefox. I’m wondering if this is Javascript related (I’m using
jQuery), but I do get two “Success” messages in Firefox even though it
only saves once. The #do success code uses Ajax to put up a view of
the parent object with the children in a table.

Can you not see what is happening by carefully examining the log file
(log/development.log)? For example if two requests were being made
you should see that there.

Another thought, have you validated the full page html in the w3c html
validator? Differences between browsers is often a sign of malformed
html. Also check in the firebug plugin in firefox that there are no
javascript errors.

Colin

Colin

On 11 March 2011 02:38, danm [email protected] wrote:

AJAX.
The same requests in Firefox only run once.

Interestingly, I’m not seeing the double success entries in Firefox
any
longer, but I just updated it this morning. Maybe I’m seeing
something
odd with the new jQuery implementation in 3.0?

Did you check that html is valid and check the page with firebug
enabled in firefox?

Colin

I do have firebug enabled in Firefox - it just wasn’t showing any
issues.
The W3C validator did the trick. It turns out that I was missing a
single “>” on the end of a

tag. It was missing on the base
page
that I was refreshing over and over again with AJAX, so all of
my AJAX calls were impacted by the same issue. I guess Firefox
was just being clever and hiding the error, but the other browsers
kept hitting the problem.

Thanks for the great tip and I’ve bookmarked the W3C Validator
page!

Dan

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