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}) ... } } In the code listing you check, for security reasons of course, that the user isn t using a silly password such as his first name. As per the example, if validation fails, the closure should return false, otherwise it should return true. The first argument passed to the closure is the object to be validated in its current state. Using this mechanism, the error code, used to pick up the error message from the grails-app/i18n/messages.properties resource bundle, will be resolved as className.propertyName.validator.invalid. For example, in the previous case, the error code would be user.password.validator.invalid. Alternatively, if your custom validation code is more complex and requires multiple different error messages, you can return a string, which is appended to the sequence className.propertyName to create the error code as shown in Listing 4-32. Listing 4-32. Specifying Message Codes class User { ... static constraints = { password(unique:true,length:5..15, validator:{ val, obj -> if(val .equalsIgnoreCase(obj.firstName)) { return 'passwordEqualsFirstName' } else if(val .equalsIgnoreCase(obj.lastName)) { return ['passwordEqualsLastName', lastName] } }) } In this case if a string is returned, validation fails, otherwise the closure should return true as usual. The error code produced here is either user.password.EqualsFirstName or user. password.EqualsLastName depending on which validation check failed. In the second return statement, however, a list is returned instead of a string: return ['passwordEqualsLastName', lastName] This allows arguments to be passed to the message within the bundle using the standard java.text.MessageFormat format. For example, a message within the property bundle for the previous code and arguments could be something like the following: user.password.EqualsLastName=Your password cannot be {3} as it is your last name! The index to retrieve passed arguments starts from the number 3 because the first three arguments available to all messages are always the property name, class name, and property value.

This gives you the following command line: convert -affine 0.9659,0.2588,-0.2588,0.9659,250,0 -transform input.jpg output.jpg igure 7-96.

In addition to extra_context, the template s context will be as follows: date_list: A list of datetime.date objects representing all years that have objects available according to queryset. These are ordered in reverse. For example, if you have blog entries from 2003 through 2006, this list will contain four datetime.date objects, one for each of those years. latest: The num_latest objects in the system, in descending order by date_field. For example, if num_latest is 10, then latest will be a list of the latest ten objects in queryset.

View function: django.views.generic.date_based.archive_year Use this view for yearly archive pages. These pages have a list of months in which objects exist, and they can optionally display all the objects published in a given year.

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Earlier we looked at how GORM performs updates to persistent instances. Just to recap an important fact about the way GORM deals with updates, it is not necessary to call the save method for the updates to take effect. GORM, thanks to the underlying Hibernate runtime, will realize that the instance has changed and will perform these updates for you automatically when no exceptions occur. Given that we ve just been talking about data integrity and validation it is important to understand why this is not always desired behavior. If an instance does not validate clearly, you don t want the changes to be persisted. Luckily, calling the save method in GORM neatly handles this problem. Essentially, if you do call save and the object does not validate, any changes made to the object will not be saved. In this sense it is important to understand how save differs from validate. The validate method will not discard changes if validation fails, thus allowing you to rectify those changes at run time and still have the object persisted. To understand this better Listing 4-33 shows a few examples that fail to validate. Listing 4-33. Validating on save // get def u1 def u2 def u3 def u4 four hypothetical users from the database = User.get(1) = User.get(2) = User.get(3) = User.get(4)

Extending the archive_index example from earlier, we ll add a way to view all the books published in a given year: from mysite.books.models import Book from django.conf.urls.defaults import * from django.views.generic import date_based book_info = { "queryset" : Book.objects.all(), "date_field" : "publication_date" } urlpatterns = patterns('', (r'^books/$', date_based.archive_index, book_info), (r'^books/( P<year>d{4})/ $', date_based.archive_year, book_info), )

This is the last chapter in this book that deals with the ImageMagick command line, and you ve come a long way throughout these seven chapters. In this chapter, I discussed the various ImageMagick drawing commands, which let you modify existing images and create new images. ImageMagick can perform a lot of cool operations on images from the command line, and I hope you ve enjoyed the last seven chapters. They should form a useful reference for your future use of the command-line tools. The next four chapters focus on examples of programmer interfaces to ImageMagick, so you ll need to know something about coding to get much utility from those chapters. If you re a programmer, you ll get to see how to use different aspects of ImageMagick in Perl, C, Ruby, and PHP Finally, I ll finish off the book with a chapter on where to go from what s covered in . this book.

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