Rails - Nov 2005 - Plz help with error in depot-app from Agile-Development Book

Hi @all,

i followed the depot-app and got an error that i could not fix.

the error is after adding a product to the cart with the ''Add to
Cart'' Link,
when the display_cart view is called.

i''ve implemented all methods and i compared my source-code with the
code-example from the pragprogs and i see no difference.
i triple-checked all methods and could not find whats wrong here.

could someone be so kind and give me a hint?

Thanks,
Torstello

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

Showing */store/display_cart.rhtml* where line *#6* raised:

undefined method `product'' for 19.95:Float

Extracted source (around line *#6*):

3: <table>
4: <%
5: for item in @items
6: product = item.product
7: -%>
8:   <tr>
9:     <td> <%= item.quantity %> </td>



Show session dump
<http://torstello.kicks-ass.org:3000/store/display_cart#>

:cart: !ruby/object:Cart
  items:
  - 19.95
  total_price: 19.95
flash: !map:ActionController::Flash::FlashHash {}


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you are not putting an array of [product]s in your session under key  
session[:items]
but [product.price] which is a float value

it guess the error is somewhere in the add_to_cart action in your  
controller



On Mon, 07 Nov 2005 13:35:45 +0100, Torsten Schmidt
<torstello-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hi @all,
>
> i followed the depot-app and got an error that i could not fix.
>
> the error is after adding a product to the cart with the ''Add to
Cart''
> Link,
> when the display_cart view is called.
>
> i''ve implemented all methods and i compared my source-code with
the
> code-example from the pragprogs and i see no difference.
> i triple-checked all methods and could not find whats wrong here.
>
> could someone be so kind and give me a hint?
>
> Thanks,
> Torstello
>
> ---------------------------------
>
> Showing */store/display_cart.rhtml* where line *#6* raised:
>
> undefined method `product'' for 19.95:Float
>
> Extracted source (around line *#6*):
>
> 3: <table>
> 4: <%
> 5: for item in @items
> 6: product = item.product
> 7: -%>
> 8:   <tr>
> 9:     <td> <%= item.quantity %> </td>
>
>
>
> Show session dump  
> <http://torstello.kicks-ass.org:3000/store/display_cart#>
>
> :cart: !ruby/object:Cart
>   items:
>   - 19.95
>   total_price: 19.95
> flash: !map:ActionController::Flash::FlashHash {}

Thanks for your tip Pete,

i still could not find what''s wrong, here my card-methods:

-----------
store_controller.rb:
----------
def add_to_cart
product = Product.find(params[:id])
@cart = find_cart
@cart.add_product(product)
redirect_to(:action => ''display_cart'')
end

def display_cart
@cart = find_cart
@items = @cart.items
end


---------
cart.rb
--------
class Cart

attr_reader :items
attr_reader :total_price

def initialize
@items = []
@total_price = 0.0
end

def add_product(product)
@items << LineItem.for_product(product)
@total_price += product.price
end
end

--------
line_item.rb
-------
def self.for_product(product)
item = self.new
item.quantity = 1
item.product = product
item.unit_price = product.price
end


you are not putting an array of [product]s in your session under key
session[:items]
but [product.price] which is a float value

it guess the error is somewhere in the add_to_cart action in your
controller

On Mon, 07 Nov 2005 13:35:45 +0100, Torsten Schmidt
<torstello@...
<http://gmane.org/get-address.php?address=torstello%2dRe5JQEeQqe8AvxtiuMwx3w%40public.gmane.org>>
wrote:
> Hi  <at> all,
>
> i followed the depot-app and got an error that i could not fix.
>
> the error is after adding a product to the cart with the ''Add to
Cart''
> Link,
> when the display_cart view is called.
>
> i''ve implemented all methods and i compared my source-code with
the
> code-example from the pragprogs and i see no difference.
> i triple-checked all methods and could not find whats wrong here.
>
> could someone be so kind and give me a hint?
>
> Thanks,
> Torstello
>
> ---------------------------------
>
> Showing */store/display_cart.rhtml* where line *#6* raised:
>
> undefined method `product'' for 19.95:Float
>
> Extracted source (around line *#6*):
>
> 3: <table>
> 4: <%
> 5: for item in  <at> items
> 6: product = item.product
> 7: -%>
> 8:   <tr>
> 9:     <td> <%= item.quantity %> </td>
>
>
>
> Show session dump
>
> :cart: !ruby/object:Cart
>   items:
>   - 19.95
>   total_price: 19.95
> flash: !map:ActionController::Flash::FlashHash {}

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Rails mailing list
Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
http://lists.rubyonrails.org/mailman/listinfo/rails

probably you have to get rid of an previous session with crap inside...

brute force:
(1) delete all cookies
(2) restart your browser
(3) restart WEBrick


On Mon, 07 Nov 2005 15:39:03 +0100, Torsten Schmidt
<torstello-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Thanks for your tip Pete,
>
> i still could not find what''s wrong, here my card-methods:
>
> -----------
> store_controller.rb:
> ----------
> def add_to_cart
> product = Product.find(params[:id])
> @cart = find_cart
> @cart.add_product(product)
> redirect_to(:action => ''display_cart'')
> end
>
> def display_cart
> @cart = find_cart
> @items = @cart.items
> end
>
>
> ---------
> cart.rb
> --------
> class Cart
>
> attr_reader :items
> attr_reader :total_price
>
> def initialize
> @items = []
> @total_price = 0.0
> end
>
> def add_product(product)
> @items << LineItem.for_product(product)
> @total_price += product.price
> end
> end
>
> --------
> line_item.rb
> -------
> def self.for_product(product)
> item = self.new
> item.quantity = 1
> item.product = product
> item.unit_price = product.price
> end
>
>
> you are not putting an array of [product]s in your session under key
> session[:items]
> but [product.price] which is a float value
>
> it guess the error is somewhere in the add_to_cart action in your
> controller
>
> On Mon, 07 Nov 2005 13:35:45 +0100, Torsten Schmidt
> <torstello@...  
>
<http://gmane.org/get-address.php?address=torstello%2dRe5JQEeQqe8AvxtiuMwx3w%40public.gmane.org>>
> wrote:
>
>> Hi  <at> all,
>>
>> i followed the depot-app and got an error that i could not fix.
>>
>> the error is after adding a product to the cart with the ''Add
to Cart''
>> Link,
>> when the display_cart view is called.
>>
>> i''ve implemented all methods and i compared my source-code
with the
>> code-example from the pragprogs and i see no difference.
>> i triple-checked all methods and could not find whats wrong here.
>>
>> could someone be so kind and give me a hint?
>>
>> Thanks,
>> Torstello
>>
>> ---------------------------------
>>
>> Showing */store/display_cart.rhtml* where line *#6* raised:
>>
>> undefined method `product'' for 19.95:Float
>>
>> Extracted source (around line *#6*):
>>
>> 3: <table>
>> 4: <%
>> 5: for item in  <at> items
>> 6: product = item.product
>> 7: -%>
>> 8:   <tr>
>> 9:     <td> <%= item.quantity %> </td>
>>
>>
>>
>> Show session dump
>>
>> :cart: !ruby/object:Cart
>>   items:
>>   - 19.95
>>   total_price: 19.95
>> flash: !map:ActionController::Flash::FlashHash {}

> probably you have to get rid of an previous session with crap inside...
>
> brute force:
> (1) delete all cookies
> (2) restart your browser
> (3) restart WEBrick
all of this done, same error. I got stuck with this :(

Any suggestions whow to debug, what is actually filled in the items[] by
items << LineItem.for_product(product)?

Rails give a possibility to set a breakpoint, but where do i see the actual
variable-values?
could i test this step by step with script/console?

Sorry i''m just a beginner with rails, coming from java/eclipse
programming
so i need more skills to track an error down.

Torstello

> i still could not find what''s wrong, here my card-methods:
>
> -----------
> store_controller.rb:
> ----------
> def add_to_cart
> product = Product.find(params[:id])
>  <at> cart = find_cart
>  <at> cart.add_product(product)
> redirect_to(:action => ''display_cart'')
> end
>
> def display_cart
>  <at> cart = find_cart
>  <at> items =  <at> cart.items
> end
>
>
> ---------
> cart.rb
> --------
> class Cart
>
> attr_reader :items
> attr_reader :total_price
>
> def initialize
>  <at> items = []
>  <at> total_price = 0.0
> end
>
> def add_product(product)
>  <at> items << LineItem.for_product(product)
>  <at> total_price += product.price
> end
> end
>
> --------
> line_item.rb
> -------
> def self.for_product(product)
> item = self.new
> item.quantity = 1
> item.product = product
> item.unit_price = product.price
> end
>

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Rails mailing list
Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
http://lists.rubyonrails.org/mailman/listinfo/rails

Did you check your data in the database? 

I had a similar problem with my orders - I deleted a product in the database,
but had orders against it ...

Sven

On Mon, 7 Nov 2005 16:38:42 +0100, Torsten Schmidt
wrote:
>> probably you have to get rid of an previous session with crap
>> inside...
>>
>> brute force:
>> (1) delete all cookies
>> (2) restart your browser
>> (3) restart WEBrick
>>
> all of this done, same error.  I got stuck with this :(
>
> Any suggestions whow to debug, what is actually filled in the
> items[] by items << LineItem.for_product(product)?
>
> Rails give a possibility to set a breakpoint, but where do i see
> the actual variable-values?
> could i test this step by step with script/console?
>
> Sorry i''m just a beginner with rails, coming from java/eclipse
> programming so i need more skills to track an error down.
>
> Torstello
>
>

I had this exact same problem at the exact same point in the Agile  
Rails tutorial.  It was indeed a session problem.  You can do it  
Pete''s way or alternatively, I think you can just do this (on
''nix):
cd /tmp; rm -rf ruby*

Lesson learned: When everything looks perfect but I still get errors,  
there''s probably a funky session that needs to be killed.

Sean



On Nov 8, 2005, at 12:13 AM, Pete wrote:
> probably you have to get rid of an previous session with crap  
> inside...
>
> brute force:
> (1) delete all cookies
> (2) restart your browser
> (3) restart WEBrick
>
>
> On Mon, 07 Nov 2005 15:39:03 +0100, Torsten Schmidt  
> <torstello-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>> Thanks for your tip Pete,
>>
>> i still could not find what''s wrong, here my card-methods:
>>
>> -----------
>> store_controller.rb:
>> ----------
>> def add_to_cart
>> product = Product.find(params[:id])
>> @cart = find_cart
>> @cart.add_product(product)
>> redirect_to(:action => ''display_cart'')
>> end
>>
>> def display_cart
>> @cart = find_cart
>> @items = @cart.items
>> end
>>
>>
>> ---------
>> cart.rb
>> --------
>> class Cart
>>
>> attr_reader :items
>> attr_reader :total_price
>>
>> def initialize
>> @items = []
>> @total_price = 0.0
>> end
>>
>> def add_product(product)
>> @items << LineItem.for_product(product)
>> @total_price += product.price
>> end
>> end
>>
>> --------
>> line_item.rb
>> -------
>> def self.for_product(product)
>> item = self.new
>> item.quantity = 1
>> item.product = product
>> item.unit_price = product.price
>> end
>>
>>
>> you are not putting an array of [product]s in your session under key
>> session[:items]
>> but [product.price] which is a float value
>>
>> it guess the error is somewhere in the add_to_cart action in your
>> controller
>>
>> On Mon, 07 Nov 2005 13:35:45 +0100, Torsten Schmidt
>> <torstello@...
<http://gmane.org/get-address.php?address=torstello%
>> 2dRe5JQEeQqe8AvxtiuMwx3w%40public.gmane.org>>
>> wrote:
>>
>>> Hi  <at> all,
>>>
>>> i followed the depot-app and got an error that i could not fix.
>>>
>>> the error is after adding a product to the cart with the
''Add to
>>> Cart''
>>> Link,
>>> when the display_cart view is called.
>>>
>>> i''ve implemented all methods and i compared my source-code
with the
>>> code-example from the pragprogs and i see no difference.
>>> i triple-checked all methods and could not find whats wrong here.
>>>
>>> could someone be so kind and give me a hint?
>>>
>>> Thanks,
>>> Torstello
>>>
>>> ---------------------------------
>>>
>>> Showing */store/display_cart.rhtml* where line *#6* raised:
>>>
>>> undefined method `product'' for 19.95:Float
>>>
>>> Extracted source (around line *#6*):
>>>
>>> 3: <table>
>>> 4: <%
>>> 5: for item in  <at> items
>>> 6: product = item.product
>>> 7: -%>
>>> 8:   <tr>
>>> 9:     <td> <%= item.quantity %> </td>
>>>
>>>
>>>
>>> Show session dump
>>>
>>> :cart: !ruby/object:Cart
>>>   items:
>>>   - 19.95
>>>   total_price: 19.95
>>> flash: !map:ActionController::Flash::FlashHash {}
>
>
> _______________________________________________
> Rails mailing list
> Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
>
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