redirect_to in controller

[PC Leung]

Hi All

when 'create' procedure is called in line_items_controller.rb, it will redirect to @line_item.cart.

Actually, I find  ../views/carts/show.html.erb is called.

but ../views/line_items/show.html.erb is not used.

why "@line_item.cart" is mapped to ../carts/show.html.erb ?

Thanks 

-------------

line_items_controller.rb

def create
product = Product.find(params[:product_id]) @line_item = @cart.line_items.build(product: product)

respond_to do |format| if @line_item.save

format.html { redirect_to @line_item.cart, notice: 'Line item was successfully created.' }

format.json { render action: 'show', status: :created, location: @line_item } 

[Matthew Rudy Jacobs]

@PC

redirecting_to *redirects* to a new url.

If you check the URL bar on your browser, it should say /cars/1

So actually, the rendering is taking place in the CartsController.

Why not run `tail -f log/development.log`, and see what is actually happening?

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[PC Leung]

Hi Mattew

In the log, I find it goes from 

Processing by LineItemsController@create as HTML

..

Redirected to http://localhost:3000/carts/16

..

Processing by CartsController#show as HTML

why "redirect_to @line_item.cart" can do this?

Thanks

[PC Leung]

is it correct ?

because @line_item.cart contains a number, say '16',

then it goes to #show. 

since it is under CartsController

thus CartsController#show is called. 

I have replaced @line_item.cart with carts_path. It goes to CartsController#index.

[Matt U]

Hi PC,

The short version of what's going on, is that you're telling it to redirect to an instance of 'Cart', so it is redirecting to cart_url(@line_item.cart), which would be invoking CartsController#show - and hence the view for cart is rendered.

This is normally the desired behaviour, so perhaps redirecting to the cart isn't exactly the behaviour that you are after?

Cheers,

Matt

Sent from my iPhone

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[PC Leung]

Thanks Matt. I check and learn how it works only.