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Ruchita Sharma

2007-Nov-20 08:29 UTC

Shopping cart implementation

Hi all,

I am implementing the functionality of shopping cart.
The problem is there is a textbox for updating quantity of the product
on the same page where the products are displayed after ading in the
cart. By default the quantity is one and after that the user can change
the quantity of the product.

Its like:
Qty   Product  Price   Total

textbox. abc   $10.00   $10.00   remove product

Total:   $10.00

My problem is that I am not able to update the implement this
functionality. Can anyone give me some idea of how to implement it??

Thanks,
Ruchita Sharma.
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Ruchita Sharma

2007-Nov-20 08:38 UTC

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Re: Shopping cart implementation

Ruchita Sharma wrote:> Hi all,
> 
> I am implementing the functionality of shopping cart.
> The problem is there is a textbox for updating quantity of the product
> on the same page where the products are displayed after ading in the
> cart. By default the quantity is one and after that the user can change
> the quantity of the product.
> 
> Its like:
> Qty   Product  Price   Total
> 
> textbox. abc   $10.00   $10.00   remove product
> 
> Total:   $10.00  update button for quantity.
> 
> My problem is that I am not able to update the implement this
> functionality. Can anyone give me some idea of how to implement it??
> 
> Thanks,
> Ruchita Sharma.I have written a code like:
store_controller.rb
def update
@quantity = request.parameters[:quantity]
@product = request.parameters[:productid]
quantity = @quantity
#productname=@product
product = @product
@cart = find_cart
@cart.add_product(product,quantity)
render :action => ''display_cart''
 end

cart.rb
def add_product(product,quantity)
  #@items << Lineitem.for_product(product)
  item = @items.find {|i| i.product_id == product.id }
  if item
    item.quantity += 1
    else
      item = Lineitem.for_product(product)
      @items << item
   end

But the above code is throwing error:

 ActiveRecord::AssociationTypeMismatch in StoreController#update

Product expected, got String

Can anyone tell me why it''s throwing this error???

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Frederick Cheung

2007-Nov-20 09:13 UTC

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Re: Shopping cart implementation

On 20 Nov 2007, at 08:38, Ruchita Sharma wrote:>
> But the above code is throwing error:
>
> ActiveRecord::AssociationTypeMismatch in StoreController#update
>
> Product expected, got String
>
presumably because @product is a string containing a product id,  
rather than an instance of Product.

Fred

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Ruchita Sharma

2007-Nov-20 09:29 UTC

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Re: Shopping cart implementation

Frederick Cheung wrote:> On 20 Nov 2007, at 08:38, Ruchita Sharma wrote:
>>
>> But the above code is throwing error:
>>
>> ActiveRecord::AssociationTypeMismatch in StoreController#update
>>
>> Product expected, got String
>>
> 
> presumably because @product is a string containing a product id,
> rather than an instance of Product.
> 
> Fred
yeah I got that. Can you tell me what is the way to implement it?

store_controller.rb
def add_to_cart
product = Product.find(params[:id])
quantity = 1
@cart = find_cart
@cart.add_product(product,quantity)
redirect_to(:action =>''display_cart'')
rescue
logger.error("Attempt to access invalid product #{params[:id]}")
flash[:notice] =''Invalid product''
redirect_to(:action => ''index'')
end

def update
@quantity = request.parameters[:quantity]
@product = request.parameters[:productid]
quantity = @quantity
product = @product
add_to_cart
end


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Frederick Cheung

2007-Nov-20 09:41 UTC

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Re: Shopping cart implementation

On 20 Nov 2007, at 09:29, Ruchita Sharma wrote:
>
> Frederick Cheung wrote:
>> On 20 Nov 2007, at 08:38, Ruchita Sharma wrote:
>>>
>>> But the above code is throwing error:
>>>
>>> ActiveRecord::AssociationTypeMismatch in StoreController#update
>>>
>>> Product expected, got String
>>>
>>
>> presumably because @product is a string containing a product id,
>> rather than an instance of Product.
>>
>> Fred
>
> yeah I got that. Can you tell me what is the way to implement it?
>Well you say you''ve got it, but you''re just not doing it.
> def update
> @quantity = request.parameters[:quantity]
> @product = request.parameters[:productid]
you''re just setting @product to a string rather than using Product.find

Fred

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Ruchita Sharma

2007-Nov-20 09:50 UTC

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Re: Shopping cart implementation

Frederick Cheung wrote:> On 20 Nov 2007, at 09:29, Ruchita Sharma wrote:
> 
>>>
>>> presumably because @product is a string containing a product id,
>>> rather than an instance of Product.
>>>
>>> Fred
>>
>> yeah I got that. Can you tell me what is the way to implement it?
>>
> Well you say you''ve got it, but you''re just not doing it.
> 
>> def update
>> @quantity = request.parameters[:quantity]
>> @product = request.parameters[:productid]
> 
> you''re just setting @product to a string rather than using
Product.find
> 
> Fred
Hi,

The code is working now but only for the first row of the table i.e only 
for the first product.
My code is:
Store_controller.rb
def add_to_cart
product = Product.find(params[:id])
quantity = 1
@cart = find_cart
@cart.add_product(product,quantity)
redirect_to(:action =>''display_cart'')
rescue
logger.error("Attempt to access invalid product #{params[:id]}")
flash[:notice] =''Invalid product''
redirect_to(:action => ''index'')
end

def update
@quantity = request.parameters[:quantity]
product = Product.find(params[:productid])
quantity = @quantity
@cart = find_cart
@cart.add_product(product,quantity)
redirect_to(:action =>''display_cart'')
end

cart.rb
def add_product(product,quantity)
  #@items << Lineitem.for_product(product)
  item = @items.find {|i| i.product_id == product.id }
  if item
    item.quantity += 1
    else
      item = Lineitem.for_product(product,quantity)
      @items << item
   end

lineitem.rb

def self.for_product(product,quantity)
item = self.new
item.quantity = quantity
item.product = product
item.unit_price = product.product_price
item
end

Can you tell me wat is wrong here.

Thanks a lot for the help.

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Ruchita Sharma

2007-Nov-20 11:14 UTC

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Re: Shopping cart implementation

Hi,

Can anyone tell me what''s wrong with the above code. Th code is working
but only for first product in the cart and not for other ones.
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Ruchita Sharma

2007-Nov-20 11:54 UTC

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Re: Shopping cart implementation

Ruchita Sharma wrote:> Hi,
> 
> Can anyone tell me what''s wrong with the above code. Th code is
working
> but only for first product in the cart and not for other ones.
Hi,

Please tell me the solution of this problem.
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Pratik

2007-Nov-20 12:57 UTC

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Re: Shopping cart implementation

Ruchita, I guess you might find rails irc channel a lot more useful
than this mailing list, as it''s real time.

Try http://www.mirc.com/
Server : irc.freenode.net
Channel : #rubyonrails

On Nov 20, 2007 11:54 AM, Ruchita Sharma
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
> Ruchita Sharma wrote:
> > Hi,
> >
> > Can anyone tell me what''s wrong with the above code. Th code
is working
> > but only for first product in the cart and not for other ones.
>
> Hi,
>
> Please tell me the solution of this problem.
>
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>


-- 
Cheers!
- Pratik
http://m.onkey.org

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Ruchita Sharma

2007-Nov-21 04:41 UTC

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Re: Shopping cart implementation

Hi all,

I am implementing the functionality of shopping cart. The problem is 
there is a textbox for updating quantity of the product on the same page 
where the products are displayed after adding in the cart. By default 
the quantity is one and after that the user can change the quantity of 
the product by changing the quantity in the text field and clicking the 
update button. The quantity is updating but only for the first product 
in the table. Not able to get the id of the selected product for 
updating the quantity.

The code is as follows:

<%= form_tag :controller => ''store'', :action=>
''update''%>

<table cellpadding="10" cellspacing="0" id=
"table">
<tr class="carttitle">
<td rowspan="2">Qty</td>
<td rowspan="2">Description</td>
<td colspan="2">Price</td>
</tr>
<tr class="carttitle">
<td>Each</td>
<td>Total</td>
</tr>
<%
i = 0
for item in @items
product = item.product
i = i + 1
-%>
<tr>
<td><input id="quantity" name = "quantity"
type="text" value="<%=
item.quantity %>" size="1" /></td>
<td align="center"><%=
text_field(''id_''+i.to_s, ''product'',
''id'') %></td>

<td><%= h(product.product_name) %></td>
<td align="right"><%= fmt_dollars(item.unit_price)
%></td>
<td align="right"><%= fmt_dollars(item.unit_price *
item.quantity)
%></td>
<td align="right"><%= link_to_remote "remove
product", :update =>
"tablecart",
:url => {:action => :remove_from_cart, :controller =>
"store",:id =>
product.id},
:complete => 
"deductprice(''#{item.unit_price}'',''#{@cart.total_price}'',''#{product.id}'');"
%>
<td align="right">
</td>
</tr>
<% end %>
<tr>
<td colspan="3"
align="right"><strong>Total:</strong></td>
<td id="totalcell"><%= fmt_dollars(@cart.total_price)
%></td>

<input type="hidden" value="<%= @cart.total_price %>
" id="txtTotal">
<input type="submit" value="update">
</tr>
<% form_tag %>
</div>
</table>

Can someone tell me where I am doing mistake in the above code?

Thanks,
Ruchita.
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Rohit Mehra

2007-Nov-22 11:33 UTC

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Re: Shopping cart implementation

HI,

I am writing
<td><%= text_field_tag "items[#{product.id}]", item.quantity,
:id
=>"items_#{product.id}"%></td> in my view.

In controller
def update
params[:items].each do|id,qty|
product=Product.find_by_id(id)
end

In params[:items] in am getting parameters like
{"items"=>{"35"=>"1",
"36"=>"9"}},
but when i am using this in my controller it is showing the last 
selected product.
Can anyone tell me how to get the all parameters from 
params[:items].each do |id,qty|.


Thanks,
Ruchita Sharma.
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Rails - Nov 2007 - Shopping cart implementation

Shopping cart implementation

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