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Perhaps the most important behavior of a field is how it validates and cleans user input. After all, fields exist as a bridge between dangerous incoming data and a safe Python environment, so it s essential that this translation be done properly. The field s method is primarily responsible for this, both for raising exceptions for improper data and for returning a cleaned value if the input is valid. The method s signature is simply , accepting the field object itself and also the incoming value. Then, if the value is deemed inappropriate according to the field s requirements, it should raise an instance of with a message indicating what went wrong. Otherwise, it should convert the value to whatever native Python data type is appropriate for the field and return it. In addition to making sure error messages are as descriptive as possible, it s important to keep maintenance of error messages simple, while still allowing individual instances to override them. Django facilitates this by way of a pair of attributes called and , as well as an argument called . This may seem like a tangled nest of values, but the way it works is rather simple. A field class defines its standard error messages in a class-level attribute called . This is a dictionary mapping an easily-identifiable key to the actual error message string. Since fields will often inherit from other fields, which may define their own

Another option is to show nested elements by nesting one grid control inside another. This allows you to deal with much more complex XML structures. The remarkable part is that ASP.NET provides support for this approach without requiring you to write any code. This is notable, especially because it does require code to create the nested master-details grid display demonstrated in 10. The next example uses nested grids to create a list of movies, with a separate list of starring actors in each movie. To accomplish this, you begin by defining the outer grid. Using a template, you can display the title and director information: <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="sourceDVD"> <Columns> <asp:TemplateField HeaderText="DVD"> <ItemTemplate> <b><% #XPath("./Title") %></b><br /> <%# XPath("./Director") %><br /> <br /><i>Starring...</i><br /> ... Now, you need to define another GridView control inside the template of the first GridView. The trick is in the DataSource property, which you can set using a new XPathSelect() data binding statement, as shown here: ... <asp:GridView id="GridView2" AutoGenerateColumns="False" DataSource='<%# XPathSelect("./Starring/Star") %>' runat="server"> ... When you call XPathSelect(), you supply the XPath expression that retrieves the XmlNodeList based on a search starting at the current node. In this case, you need to drill down from the root <DvdList> element to the group of <Star> elements. Once you ve set the right data source, all you need to do is define a template in the second GridView that displays the appropriate information. In this case, you need only a single data binding expression to get the element text: ... <Columns> <asp:TemplateField> <ItemTemplate> <%# XPath(".") %><br /> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView>

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In this example, you might want to consider using the Repeater to show the actor names. That way, you have the flexibility to show the list in a more compact format, without using a table.

Some controls have the built-in smarts to show hierarchical data. In .NET, the principal example is the TreeView. When you bind the TreeView to an XmlDataSource, it uses the XmlDataSource.GetHierarchicalView() method and displays the full structure of the XML document (see Figure 12-13).

attributes, Django automatically combines them all into one dictionary when the field is instantiated. In addition to using , Django allows individual field instances to override some of these messages by way of the argument. Any values in that dictionary will replace the default values for the keys specified, but only for that particular field instance. All other instances of the field will remain unaffected. That means that error messages can come from three separate places: the field class itself, the field s parent classes and the arguments used to instantiate the field. When looking to raise an exception as part of the method, there needs to be a simple way to retrieve a specific error message, regardless of where it was actually defined. For this, Django populates an attribute of every field instance, which contains all the messages that were defined in all three ways. This way, can simply look up a key in and use its value as the argument to .

Figure 12-13. Automatically generated TreeView bindings The TreeView s default XML representation still needs a lot to be desired. It shows only the document structure (the element names), not the document content (the element text). It also ignores attributes. To improve this situation, you need to set the TreeView.AutoGenerateDataBindings property to false, and you then need to explicitly map different parts of the XML document to TreeView nodes. <asp:TreeView ID="TreeView1" runat="server" DataSourceID="sourceDVD" AutoGenerateDataBindings="False"> ... </asp:TreeView> To create a TreeView mapping, you need to add <TreeNodeDataBinding> elements to the <DataBinding> section. You must start with the root element and then add a binding for each level you want to show. You cannot skip any levels.

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