Instance variable in method definition?

Ruby
1

In this Padrino example:

MyApp.controller :products do
get :show, :map => “/this-is/:id/cool” do
@product = Product.find(params[:id])
render ‘products/show’
end
end

… I’m confused about the use of the symbol :products in the first
line and the instance variable @product in the 3rd line. Is :products a
parameter to the MyApp.controller method? If this is a method definition
how can an instance variable valid? I thought instance variables were
only valid within instances, ie. objects?

gvim

2

At
MyApp.controller

you are sending the method controller to the object MyApp.
So it’s not a method “definition” as you said.

Yes, it’s a parameter.

MyApp.controller(:products) do

would do the same.

This method “controller” is receiving a parameter and a block.
get is also a method calling.

get(:show, { :map => "/this-is/:id/cool }) do

is essentially the same (but uglier IMHO).

@product is an instance variable, yes.

It’s probably on the context of the MyApp object (unless the block
passed is being instance evaluated (on another instance)).

Abinoam Jr.

3

Sorry for the typo on this line

get(:show, { :map => “/this-is/:id/cool” }) do

Abinoam Jr.