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If you want to reuse your filter code in many different places, it might be worth separating the code in its own class: class LoggingFilter def self.filter(controller) controller.logger.info "#{controller.request.request_uri} called" end end class AdminController < ApplicationController after_filter LoggingFilter end When using an around_filter, you need to use the class form for the filter. In that case, you define methods before and after in the filter class, which are then executed before and after the actual action code. Note that you can also use the :only and :except parameters to restrict the filter calls to only some specific action in a controller. For more information about ActionController filters, see http://api.rubyonrails.org/classes/ ActionController/Filters/ClassMethods.html.

hen writing computer programs, it is usually possible to discern between a normal course of events and something that s exceptional (out of the ordinary). Such exceptional events might be errors (such as trying to divide a number by zero), or simply something you might not expect to happen very often. To handle such exceptional events, you might use conditionals everywhere the events might occur (for example, have your program check whether the denominator is zero for every division). However, this would not only be inefficient and inflexible, but would also make the programs illegible. You might be tempted to ignore these exceptions and just hope they won t occur, but Python offers a powerful alternative.

Method: catalog_category.assignProduct ($category_id, $product_id, $position)

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In the initialize_cart method, we check whether there is an item called :cart_id in the session hash and if there is, load a cart with that id, also fetching all of the cart s items with the same query. If no cart_id is stored in the session, we create a new cart and store the id of the new cart to the session hash. This way, we can be sure that a single session-wide Cart object is at hand everywhere in both CatalogController and CartController. Once we now know that there is always a Cart object @cart present, we can also show it in the actions of the CatalogController we created in the previous chapter.

To represent exceptional conditions, Python uses exception objects. If such an exception object is not handled in any way, the program terminates with a so-called traceback (an error message): >>> 1/0 Traceback (most recent call last): File "<stdin>", line 1, in ZeroDivisionError: integer division or modulo by zero If such error messages were all you could use exceptions for, exceptions wouldn t be very interesting. The fact is, however, that each exception is an instance of some class (in this case ZeroDivisionError), and these instances may be raised and caught in various ways, allowing you to trap the error and do something about it instead of allowing the entire program to fail. In the next section, you learn how to create and raise your own exceptions. In the following sections, you learn about handling exceptions in various ways.

Description: Assigns a product under the given category_id. Return: Boolean; true if update was successful. Arguments: $category_id (required). The product will be assigned to this category_id. $product_id (required). You can input the product_id or SKU number of the product. $position (optional). Sets the position within the category.

We want to create a floating cart that will show all the items we have in our shopping cart and will appear on all the catalog pages. Let s first create a partial called app/views/cart/_cart.rhtml: <% if flash[:cart_notice] %> <%= render :partial => "cart/cart_notice" %> <% end %> <h3>Your Shopping Cart</h3>

Exceptions may be used to represent exceptional or illegal states in your program (such as trying to divide a number by zero, or reading from a nonexistent file), and will, unless caught by you, terminate the program. Warnings, on the other hand, are mild error messages; they notify you that something isn t quite right, but your program keeps running. For example, try to import the regex module:

// Prepare the data $category_id = '15'; $product_id = 'SSS0004'; // using Zend XML-RPC method $result = $client->call('call', array($session_id, 'catalog_category.assignProduct', array($category_id, $product_id))); // returns true if successful var_dump($result);

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