Ruby on Rails

On May 3, 2010, at 1:49 PM, candor wrote:

> I tried a couple other approaches, but no success yet:
>
> 1. I reversed the blocks below - calling the load_images from within
> render :update - that did give me the results, but all at once in the
> end, not as the images show up.
> 2. I called redirect_to <controller/show_image?image_id=1 within the
> inner loop in 1, and created a show_image.js.rjs file which calls
> page.insert_html :bottom, 'images-div', :partial => 'image', but I get
> an error 'ActionView::MissingTemplate (Missing template
> <mycontroller>/
> show_image.erb in view path app/views) I dont really understand why
> this is happening - shouldnt it pick the rjs template if present
> instead of the erb?
>
> What I really want is to leverage http to parallelize the retrieval
> and rendering of images. How do I do that?
>
> Thanks
> Anand

<img src="/controller/show_image?image_id=1" />

Then the browser will ask for that URL and you can respond with a
send_file or send_data (rather than a render or redirect).

-Rob

>
>
>
> On May 3, 9:11 am, candor <rcan...@gmail.com> wrote:
>> Hi,
>>
>> I have a rails application where I respond to a request by fetching
>> image urls from various web api calls and need to display them as
>> they
>> come available. I am able to display all the images once I get them
>> all, but that causes an unacceptable delay for my user.
>>
>> One approach I am trying is, from my controller, set an @image
>> variable, and then pass in a block to the model that retrieves the
>> image urls. In the block, I call
>> In the controller, I have:
>> @query.load_images! do |image|
>> @image = image
>> render :update do |page|
>> page.insert_html :bottom, 'images-div', :partial => 'images'
>> end
>> end
>>
>> In my query model, I have:
>>
>> def load_images! &block
>> for(some_loop_that_gets_one_image_at_a_time) do
>> image = get_next_image
>> block.call(image)
>> end
>> end
>>
>> In the _images.html.erb, I have:
>>
>> <%=image_tag @image.url %>
>>
>> The problem is that with this approach, I get a DoubleRenderError,
>> and
>> I think this is because render is being called multiple times in the
>> block call within the loop.
>>
>> What is the best way to get the effect I need (to load images one
>> at a
>> time as they become available)?
>>
>> Thanks
>> Anand
>>
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Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com

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