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Figure 9-1. The order in which validation methods are applied to a Django form The order of validation goes like this: 1. First, full_clean() loops through the fields on the form. Each field class has a method named clean(), which implements that field s built-in validation rules, and each of these methods will either raise a ValidationError or return a value. If a ValidationError is raised, no further validation is done for that field (because the data is already known to be invalid). If a value is returned, it goes into the form s cleaned_data dictionary. 2. If a field s built-in clean() method didn t raise a ValidationError, then any available custom validation method a method whose name starts with clean_ and ends with the name of the field is called. Again, these methods can either raise a ValidationError or return a value; if they return a value, it goes into cleaned_data. 3. Finally, the form s clean() method is called. It can also raise a ValidationError, albeit one that s not associated with any specific field. If clean() finds no new errors, it should return a complete dictionary of data for the form, usually by doing return self.cleaned_data. 4. If no validation errors were raised, the form s cleaned_data dictionary will be fully populated with the valid data. If there were validation errors, however, cleaned_data will not exist, and a dictionary of errors (self.errors) will be filled with validation errors. Each field knows how to retrieve its own errors from this dictionary, which is why you can do things like {{ form.username.errors }} in a template. 5. Finally, is_valid() returns either False if there were validation errors or True if there weren t.

Creating Dialogs in GTK+ 122 Widget Packing 122 Container Widgets 122 Event Listeners 136 Signals 136 Callbacks 136 A Sample GTK+ Application 137 Gaim Signals 138 GTK+ Widgets 139 GtkLabel 139 GtkImage 140 GtkProgressBar 141 GtkEntry 143 GtkSpinButton 146 GtkButton 147 GtkToggleButton 150 GtkCheckButton 151 GtkRadioButton 152 GtkTextView 153 GtkTreeView 158 GtkComboBox 163 GtkToolbar 164 GtkMenu 167 GtkDialog 169 GtkFileChooserDialog 171 A Gaim Plug-in Example 172 Gaim Plug-in Boilerplate 173 The Data Structures 174 Using Gaim Signals 175 Scanning Messages 175 Hooking into Account Actions 178 Creating the GUI 180 The Entire Plug-In 187 Potential Enhancements 195 Summary 195.

Tablespace sizing limitations (when objects cannot extend) Datafile extent limitations (when a datafile has hit a threshold close to its maximum size) Object maximum extent limitations (when a segment has hit a threshold close to its maximum number of extents)

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Figure 3-12. A patch between revision 1.56 and 1.57 of Makefile.am as seen in ViewCVS ViewCVS provides a convenient interface to manage the versioning control of your project. In fact, many of the most useful tools used to manage your open source project are available on the Web. SourceForge.net is a free service that provides ViewCVS and a number of other useful means of managing your open source project.

Understanding this process is key to getting the most out of Django s form-handling system. It might seem a bit complex at first, but the ability to attach validation rules to a form in multiple places results in a huge amount of flexibility and makes it easier to write reusable code. For example, if you find yourself needing to use a particular type of validation over and over again, you ll notice that writing a custom method on each form gets tedious. You ll probably be better off writing your own field class, defining a custom clean() method on it, and then reusing that field. Similarly, distinguishing field-specific methods from the form-level clean() method opens up a lot of useful tricks for validating multiple fields together. You wouldn t necessarily need these tricks when working with a single field only.

Gaim is hosted by SourceForge.net, a site dedicated to providing open source projects with a number of free tools for managing those projects. The tools include CVS (including ViewCVS), which I ve just discussed, mailing lists, project Web space, and a file-release system with a large number of mirrors around the world. The most notable unique feature to SourceForge.net is its tracker system.

A common space-management error that can be encountered by users is the ORA-03232 error. This error indicates that there is not enough free space in the tablespace for the database object to acquire another extent. The Applications DBA can proactively monitor for this occurrence by using the following query to check the free space available for each object s next extent: #Script used to identify objects for sizing limitations LOGFILE=/tmp/extent_room_$ORACLE_SID.log sqlplus -s apps/apps << EOF set heading off spool $LOGFILE select distinct '$ORACLE_SID - Threshold - Not enough space for next extent.' from dba_segments a where not exists (select 'x' from dba_free_space b where a.tablespace_name = b.tablespace_name and b.bytes > a.next_extent); -- add data to logfile select tablespace_name, owner, segment_name, segment_type, to_char((next_extent/1024),'999,999')||'K' next_extent_size from dba_segments a where not exists (select 'x' from dba_free_space b where a.tablespace_name = b.tablespace_name and b.bytes > a.next_extent) order by tablespace_name,segment_name; spool off exit EOF RETURN_CODE=`grep "Threshold" $LOGFILE | wc -l`

Note The concept of a tracker is not unique to SourceForge.net, but SourceForge's implementation of a tracker is. Perhaps the most popular open source tracker software is Bugzilla, from the Mozilla project, which you can read about at http://www.bugzilla.org.

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