[Rails] rendering images dynamically

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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