This might seem really simple to some but just wanted to ask: what is
the difference between @session[''user''] and session[:user] ?
and how
would you use each?
And another question, I have the following code:
def get_customer
if @session[''customer'']
@c = Customer.find(@session[''customer''])
end
end
private
def initialize_cart
if session[:cart_id]
@cart = Cart.find(session[:cart_id])
else
@cart = Cart.create
session[:cart_id] = @cart.id
end
end
How do I assign the cart to the logged in customer?
Thanks in advance,
Elle
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On 17 Oct 2007, at 07:44, elle wrote:> > This might seem really simple to some but just wanted to ask: what is > the difference between @session[''user''] and session[:user] ? and how > would you use each?@session is deprecated. Use session (which is a method).> And another question, I have the following code: > > def get_customer > if @session[''customer''] > @c = Customer.find(@session[''customer'']) > end > end > > private > > def initialize_cart > if session[:cart_id] > @cart = Cart.find(session[:cart_id]) > else > @cart = Cart.create > session[:cart_id] = @cart.id > end > end > > How do I assign the cart to the logged in customer? >Not entirely sure what you mean, but you''ve got an @cart containing a cart and @c containing your customer so you should be able to put the 2 together. Fred --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
well ''customer'' is a string: irb(main):001:0> ''customer''.class => String and :customer is a symbol: irb(main):002:0> :customer.class => Symbol I don''t know much about ruby, but indexing (or what is the right term) with symbols is better idea then indexing with strings. Because (in- theory at least) an object of Symbol class is smaller then an object of a String class. Try ''customer''.methods vs. :customer.methods On 17 Жов, 08:44, elle <wazne...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> This might seem really simple to some but just wanted to ask: what is > the difference between @session[''user''] and session[:user] ? and how > would you use each? > > And another question, I have the following code: > > def get_customer > if @session[''customer''] > @c = Customer.find(@session[''customer'']) > end > end > > private > > def initialize_cart > if session[:cart_id] > @cart = Cart.find(session[:cart_id]) > else > @cart = Cart.create > session[:cart_id] = @cart.id > end > end > > How do I assign the cart to the logged in customer? > > Thanks in advance, > Elle--~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
> well ''customer'' is a string:Some Hashes in Rails are old-fashioned, and some use .with_indifferent_access. That means you can insert strings or symbols, and query symbols or strings, indifferently. This allows you to use the most natural expressions when inserting or querying.> I don''t know much about ruby, but indexing (or what is the right term) > with symbols is better idea then indexing with strings. Because (in- > theory at least) an object of Symbol class is smaller then an object of a > String class.Symbols are converted to unique numbers at compile time, while Ruby must wait until evaluation time to convert strings into numbers. So symbols are generally faster.> Try ''customer''.methods vs. :customer.methodsCute, but the number of methods is not a direct indicator of speed or size! Indirectly, things with fewer methods have more opportunities for optimization, so a symbol indeed has fewer methods! -- Phlip --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
what is> the difference between @session[''user''] and session[:user] ?session[''user''] when you say, there is a temporary string object created to access the session hash, session[:user] when you say, No temporary object created here, but there is only Symbol object created at the first time of use. And from then onwards the any access to sessoin[:user] uses same Symbol object. Meaning there will be only one memory reference to symbol object. How do I assign the cart to the logged in customer? you can do in different ways, 1. Like what you are trying to implement, Create a new Card Object, once a user logs in and assign that card_id to the logged in user''s session. Then, from then onwards use that card id to add any product which plan to purchase. 2. Create Some database relation-ship between user and card model. 3. Use javascript, ajax and cookie to implement your card logic. On Oct 17, 11:44 am, elle <wazne...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> This might seem really simple to some but just wanted to ask: what is > the difference between @session[''user''] and session[:user] ? and how > would you use each? > > And another question, I have the following code: > > def get_customer > if @session[''customer''] > @c = Customer.find(@session[''customer'']) > end > end > > private > > def initialize_cart > if session[:cart_id] > @cart = Cart.find(session[:cart_id]) > else > @cart = Cart.create > session[:cart_id] = @cart.id > end > end > > How do I assign the cart to the logged in customer? > > Thanks in advance, > Elle--~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
> How do I assign the cart to the logged in customer? > you can do in different ways, > 1. Like what you are trying to implement, Create a new Card Object, > once a user logs in and assign that card_id to > the logged in user''s session. Then, from then onwards use that card id > to add any product which plan to purchase. > > 2. Create Some database relation-ship between user and card model. > > 3. Use javascript, ajax and cookie to implement your card logic. >OK, so I have the following tables in my db: customers, carts, cart_items. The carts table has 2 columns: id and customer_id The Customer class has: has_many : carts The Cart class has: has_many : products :through :cart_items has_one :customer Also, when the customer logs in, to display his name for example, I use @c.name in the view. I''m really new to rails but from my understanding, @c is an array (is that right?) that holds all of the customer''s details. I''ve tried to assign the @cart to @c but it didn''t work. I''m not sure how to do this. Also now, I call all the cart items by using @cart.products. How do i cahnge it to call for all the products in the cart that belongs to customer? This is the code for customer login and logout: def login # examine the form data for "name" and "password" pw,name = params[:customer].values_at(*%w{password name}) # Retrieve the customer record for the name and store it in a variable ''c'' c = Customer.find_by_name(name) # if such record exists, and it''s password matches the password from the form if c && Digest::SHA1.hexdigest(pw) == c.password # start a session with the customer id @session[''customer''] = c.id if @cart.products.empty? redirect_to :controller => "catalog" else redirect_to :action => "view_cart" end else # otherwise report an error flash[:notice] = "Invalid Login" redirect_to :controller => "catalog" end end def logout @session[''customer''] = nil redirect_to :controller => "catalog" end How should I change my code to make this happen? Thanks, Elle --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
sorry, i am not able to understand your schema definition. what will cart table contain? is it a mapping table?, if yes follow rails naming convention. what is the relation ship between cart, cart_items and products. ? and what does cart_item contain? usuallly when you have has_many relationship, you can say @customer.cart_ids = [1,2,3] where [1,2,3] is list of cart id''s which you want to associate to that user. and CustomerModel should have relationship with cart model, with name cart (name give to has_many). you can read any any rails book to understand this relationship topic. Good Luck., On Oct 18, 1:14 am, elle <wazne...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> > How do I assign the cart to the logged in customer? > > you can do in different ways, > > 1. Like what you are trying to implement, Create a new Card Object, > > once a user logs in and assign that card_id to > > the logged in user''s session. Then, from then onwards use that card id > > to add any product which plan to purchase. > > > 2. Create Some database relation-ship between user and card model. > > > 3. Use javascript, ajax and cookie to implement your card logic. > > OK, so I have the following tables in my db: customers, carts, > cart_items. > The carts table has 2 columns: id and customer_id > The Customer class has: has_many : carts > The Cart class has: has_many : products :through :cart_items > has_one :customer > > Also, when the customer logs in, to display his name for example, I > use @c.name in the view. I''m really new to rails but from my > understanding, @c is an array (is that right?) that holds all of the > customer''s details. > > I''ve tried to assign the @cart to @c but it didn''t work. I''m not sure > how to do this. > Also now, I call all the cart items by using @cart.products. > How do i cahnge it to call for all the products in the cart that > belongs to customer? > > This is the code for customer login and logout: > > def login > # examine the form data for "name" and "password" > pw,name = params[:customer].values_at(*%w{password name}) > # Retrieve the customer record for the name and store it in a > variable ''c'' > c = Customer.find_by_name(name) > # if such record exists, and it''s password matches the password > from the form > if c && Digest::SHA1.hexdigest(pw) == c.password > # start a session with the customer id > @session[''customer''] = c.id > > if @cart.products.empty? > redirect_to :controller => "catalog" > else > redirect_to :action => "view_cart" > end > else > # otherwise report an error > flash[:notice] = "Invalid Login" > redirect_to :controller => "catalog" > end > end > > def logout > @session[''customer''] = nil > redirect_to :controller => "catalog" > end > > How should I change my code to make this happen? > > Thanks, > Elle--~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
> Cute, but the number of methods is not a direct indicator of speed or > size!not precisely - if there are fewer methods the initialization process ( creating a new object ) is usually faster. -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Thank you everyone so much for assisting me in this matter.
I changed the code so instead of having session[:customer] and
session[:cart], there is only one session[:customer] with the
customer''s id. But now I am getting an error:
NoMethodError in CartController#login
undefined method `items'' for 129:Fixnum
app/controllers/cart_controller.rb:17:in `login
my cart_controller.rb has the following:
--------------------------------------------------------
class CartController < ApplicationController
before_filter :authorize, :except => ["login"]
def authorize
return true if @c
flash[:notice] = "Please login again to place your order"
redirect_to :controller => "catalog"
end
def login
pw,name = params[:customer].values_at(*%w{password name})
c = Customer.find_by_name(name)
if c && Digest::SHA1.hexdigest(pw) == c.password
# start a session with the customer id
session[:customer] = c.id
@cart = find_cart
if @cart.items.empty?
redirect_to :controller => "catalog"
else
redirect_to :action => "view_cart"
end
else
# otherwise report an error
flash[:notice] = "Invalid Login"
redirect_to :controller => "catalog"
end
end
def logout
session[:customer] = nil
redirect_to :controller => "catalog"
end
.
.
.
def find_cart
unless session[:customer]
@cart = Cart.new
session[:customer] = @cart
end
session[:customer]
end
cart.rb class:
-----------------------------------------------
class Cart < ActiveRecord::Base
# has_many :cart_items
# has_many :products, :through => :cart_items
# belongs_to :customer
attr_reader :items
def initialize
@items = []
end
and lastly, the application.rb:
------------------------------------------------
before_filter :current_customer
def current_customer
if session[:customer]
@c = Customer.find(session[:customer])
end
end
So, my login works but the app doesn''t accept the "if
@cart.items.empty?"
Any ideas?
Thanks,
Elle
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On 19 Oct, 12:45, elle <wazne...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> > So, my login works but the app doesn''t accept the "if > @cart.items.empty?" > Any ideas? >Looks like you have a model named cart_items, not just items. So, it should be if @cart.cart_items.empty? Robin --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---