How does view know about instance vars set in controller?

rubyonrails-talk
1

Hi,

I know that the AWDWR says to believe in magic and to not spend Xmas with people asking this question, but really how does it work under the hood?

I was looking at the source code of crummy, and it seems that instance_variable_set and instance_variable_get may be part of the answer. Is there some resource on that or do I have to dive into Rails code?

The method you're interested in is _copy_ivars_from_controller in ActionView::Base

Fred

2

The method you're interested in is _copy_ivars_from_controller in ActionView::Base

Fred

Thank you very much Fred. But how can I find about that myself? Is there somewhere a documentation that could walk me through the Rails' source code from the entry point (let's say Rack) to the response (returned by Rack to the client)?

Following it by hand is a bit tedious, I often lose myself in method calls that call 3 other methods that call 4 other methods.

3

Is there somewhere a documentation that could walk me through the Rails' source code from the entry point (let's say Rack) to the response (returned by Rack to the client)?

To what end?

Following it by hand is a bit tedious, I often lose myself in method calls that call 3 other methods that call 4 other methods.

Use the "step" command in the debugger.

4

To what end?

[200, {'Content-type' => 'text/html'}, response]

:smiley:

Use the "step" command in the debugger.

Any experience with Unroller? It seems to do what I want. I'll give a try at the step command too.

Thanks,