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If you re going to write a contact-form application, you might start out by defining a simple contact form like this: from django import forms from django.core.mail import mail_managers class ContactForm(forms.Form): name = forms.CharField(max_length=255) email = forms.EmailField() message = forms.CharField(widget=forms.Textarea()) def save(self): message = "%s (%s) wrote:\n\n%s" % (self.cleaned_data['name'], self.cleaned_data['email'], self.cleaned_data['message']) mail_managers(subject="Site feedback", message=message) A simple view called contact_form could process this form: from django.http import HttpResponseRedirect from django.shortcuts import render_to_response from django.template import RequestContext def contact_form(request): if request.method == 'POST': form = ContactForm(data=request.POST) if form.is_valid(): form.save() return HttpResponseRedirect("/contact/sent/") else: form = ContactForm() return render_to_response('contact_form.html', { 'form': form }, context_instance=RequestContext(request)) For the simplest cases, this would be fine. But how could you handle a situation in which you need to use a different form one with additional fields, for example, or additional validation rules The easiest solution is to remember that a Django view is simply a function and that you can define it to take any additional arguments you want to handle. You can add a new argument to the view that specifies the form class to use, and you can reference that argument whenever you need to instantiate a form from within the view: def contact_form(request, form_class): if request.method == 'POST': form = form_class(data=request.POST) if form.is_valid(): form.save() return HttpResponseRedirect("/contact/sent/")

Sometimes you ll need to create a GdkPixbuf object from a source other than a file. Gaim does this with IM images, which are images that can be embedded within certain IMs. Because these images come directly from the network, it s inefficient to save the data to disk and then have gdk_pixbuf_new_from_file() read it back to memory. Other times, you may need to display the image as it loads; this can be the case if you re downloading it from the network (think of how images load in your Web browser), or if it s a particularly large file that takes a while to read from disk. In these cases, you should use GdkPixbufLoader. GdkPixbufLoader is an object that progressively loads an image as you feed data to it. Like gdk_pixbuf_new_from_file(), it will automatically create a GdkPixbuf object from the same variety of automatically detected formats. gdk_pixbuf_new_from_file is merely a wrapper function around GdkPixbufLoader for convenience. To create a GdkPixbufLoader, call gdk_pixbuf_loader_new(). This function takes no arguments. As you receive data to feed to it, call the following:

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else: form = form_class() return render_to_response('contact_form.html', { 'form': form }, context_instance=RequestContext(request)) You can improve this slightly by supplying a default value for the new argument: def contact_form(request, form_class=ContactForm): This is how many of the optional parameters to Django s generic views work: the view function accepts a large number of arguments and supplies sensible default values. Then, if you need to change the behavior slightly, you simply pass the appropriate argument. If you re developing a business site that wants to handle sales inquiries through a form, you could define a form class to handle that perhaps called SalesInquiryForm and then set up a URL pattern like this: url(r'^inquiries/sales/$', contact_form, { 'form_class': SalesInquiryForm }, name='sales_inquiry_form'), The form_class argument you pass here overrides the default in the contact_form view, and as long as you remember to define a save() method on your SalesInquiryForm class it simply works. If you need multiple forms of different types, you can reuse the contact_form view multiple times, passing a different form_class argument each time, in much the same way you previously reused generic views by passing different sets of arguments.

Information related to ADDM may be accessed in the DBA_ADVISOR_% views. Some of the more important views are listed in Table 4-3. Table 4-3. Common ADDM Views

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