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def get_other_news_items(self): context = self.context context_path = '/'.join(context.getPhysicalPath()) query = {'portal_type': 'RegionalNews', 'review_state': 'published', 'region': context.getRegion(), 'sort_on': 'effective', 'sort_order': 'descending', 'show_inactive': False} brains = self.portal_catalog.searchResults(**query)[:3] items = [] for brain in brains: if brain.getPath() <> context_path: items.append({'title': brain.Title, 'url': brain.getURL()}) return items[:2] The page template namespace is improved by the view term, because it gives access to the view class methods and attributes, according to the allowed_interface specified in the ZCML configuration. To point at the contextual object, the view class stores in its context attribute the context for which the view has been instantiated that is, the specific RegionalNews object itself. Notice that you can also access the corresponding request as an attribute on the browser view instance. Also, we need to state that the class implements the IregionalnewsView interface. In fact, the configure.zcml file requires the .regionalnewsview.IregionalnewsView interface through the allowed_interface attribute. Finally the essence of our aim in the get_other_news_items method, we ask the portal_catalog tool for the Regional News items we want to show, published for the same region as context, ordered according to their effective date, which is the publication date set on the context. At this point, our method will just fail, because portal_catalog doesn t know what the region attribute is supposed to be. So, we need to register this new index before testing our recent efforts. Point your web browser to http://localhost:8080/plone/portal_ catalog/manage_catalogIndexes, choose to add a new KeywordIndex, and then enter region as the ID and getRegion as the Indexed attribute. Don t worry if you don t understand this just now we will go into further details very soon.

As it stands, our custom attribute can be applied anywhere to classes, to fields, to methods, and so on. The meaning of our attribute is limited to classes, and we can restrict where our attribute can be used by applying attributes to it, specifically, the AttributeUsage attribute. It may seem odd to apply attributes to attributes, but it works rather well in practice. Listing 17-10 contains a demonstration of restricting the use of our custom attribute to classes. Listing 17-10. Restricting the Use of a Custom Attribute using System; [AttributeUsage(AttributeTargets.Class)] public class DetailLevelAttribute : Attribute {

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private bool useDetailed; public DetailLevelAttribute(bool useDetailedParam) { useDetailed = useDetailedParam; } public bool UseDetailed { get { return useDetailed; } } } To restrict where an attribute can be used, you pass values from the System.AttributeTarget enum. The Class value restricts the use of the DetailLevel attribute to classes. Table 17-2 describes the most commonly used values available for controlling attribute use. Table 17-2. Values from the AttributeTarget Enum

Class Struct Enum Constructor Method Property Field Event Interface Parameter Delegate Return Value GenericParameter All

Restricting character sets to the characters allowed by the various specifications ensures that the HTTP response will be parsed by the browser correctly and as intended. Validating the URL ensures that only redirects to valid HTTP URLs can occur not to, for instance, a javascript: URL. While modern browsers will not execute script in a redirect to a javascript: URL, older browsers might. As always, we follow the whitelist, not blacklist paradigm.

Note The portal_catalog tool is a central service in Plone not only for the normal search requests from users, but for building every object s listing request. We will take a closer look at it next, in the Forms section of the chapter.

Attribute can be applied to classes Attribute can be applied to structs Attribute can be applied to enums Attribute can be applied to constructors Attributes can be applied to methods Attribute can be applied to properties Attribute can be applied to fields Attribute can be applied to events Attribute can be applied to interfaces Attribute can be applied to parameters Attribute can be applied to delegates Attribute can be applied to return values Attribute can be applied to generic parameters Attribute can be applied anywhere (this is the default)

You can combine values together using the logical OR operator (|). So, for example, if you wanted to be able to apply the DetailLevel attribute to classes and structs (but nowhere else), then you would use the following: [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct)] public class DetailLevelAttribute : Attribute { ...

When you define a custom attribute, you can control whether a derived class inherits the application of that attribute from a base class. This is done by setting the Inherited property on the AttributeUsage attribute to true. Listing 17-11 contains a demonstration. Listing 17-11. Controlling Attribute Application Inheritance using System; [AttributeUsage(AttributeTargets.Class, Inherited=true ) ] public class DetailLevelAttribute : Attribute { private bool useDetailed; public DetailLevelAttribute(bool useDetailedParam) { useDetailed = useDetailedParam; } public bool UseDetailed { get { return useDetailed; } } } When Inherited is set to true, base classes pass on their DetailLevel attribute to derived classes. Here is an example of two classes, where the base class has the DetailLevel attribute applied: [DetailLevel(true)] class VolvoCar : Car { public VolvoCar(string model, string color) : base("Volvo", model, color) { // do nothing } } class VolvoC30 : VolvoCar { public VolvoC30(string color) : base("C30", color) { // do nothing } }

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