Multiple Updates, Multiple Renders, One Ajax Call

The following code snippet allows you to update multiple DOM elements
in a single Ajax call in Rails (1.1):

pass in a hash of domid=>template name

def update_many(options)
render :update do |page|
options.each do |k,v|
page.replace_html k, render(:partial=>v)
page.visual_effect :highlight, k

So, if you wanted to update the preview div from the content partial,
and the status div from the status partial, you could now say:

update_many ‘preview’=>‘content’, ‘status’=>‘status’

Notice that I appear to be breaking the rules, in that I am calling
render multiple times (once for each item in the option hash). I
expected to have to call render_to_string instead, but that blows up,
and this works fine.

Is this behavior by design, or a coincidence? I?d like to get this
documented and make sure that it is considered a feature.

Stuart Halloway

P.S. Is there a totally better way to do this that I missed? :slight_smile:

Hah – nevermind, nothing like hitting ‘send’ to make you see the
right answer. I see now that I can use the :partial option directly
without calling render at all.

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