Rails - Sep 2007 - AJAX call creates new instance of controller class

Hi All,

I have a problem with the AJAX requests in rails. Consider a
controller class C with some methods M1, M2, M3. For this controller
class I have a view V.rhtml.

Within V.rhtml I have a periodically_call_remote AJAX request script
to call the method M1 after every 5 seconds say.

However, when I do this , I observe that for every new AJAX request a
new instance of my controller class C gets created with default values
of the instance variables, whereas I need the values of variables from
my current instance of the Class C .

Any clues as to how can I maintain a single class instance for all of
my AJAX requests from a particular client.

TIA
~Shishir


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Shishir Srivastava wrote:
> Hi All,
> 
> I have a problem with the AJAX requests in rails. Consider a
> controller class C with some methods M1, M2, M3. For this controller
> class I have a view V.rhtml.
> 
> Within V.rhtml I have a periodically_call_remote AJAX request script
> to call the method M1 after every 5 seconds say.
> 
> However, when I do this , I observe that for every new AJAX request a
> new instance of my controller class C gets created with default values
> of the instance variables, whereas I need the values of variables from
> my current instance of the Class C .
> 
> Any clues as to how can I maintain a single class instance for all of
> my AJAX requests from a particular client.
> 
> TIA
> ~Shishir
Save whatever you need to persist between AJAX calls to the session object.


-- 
Michael Wang

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Shishir Srivastava wrote:
> However, when I do this , I observe that for every new AJAX request a
> new instance of my controller class C gets created with default values
> of the instance variables, whereas I need the values of variables from
> my current instance of the Class C .
> 
> Any clues as to how can I maintain a single class instance for all of
> my AJAX requests from a particular client.
> 
> TIA
> ~Shishir
Hiya Shishir,

You need to remember that HTTP is essentially a stateless protocol - 
every ajax call you make is similar to just doing a reload in your 
webpage.

The same principles will apply to keep your current state i.e. add 
get/post parameters to your request, use session or use cookies so that 
you can determine the current state in your controller.

Hope that helps.

Luke
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