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"""
Tutorial - Multiple objects
This tutorial shows you how to create a site structure through multiple
possibly nested request handler objects.
"""
import cherrypy
class HomePage:
def index(self):
return '''
<p>Hi, this is the home page! Check out the other
fun stuff on this site:</p>
<ul>
<li><a href="/joke/">A silly joke</a></li>
<li><a href="/links/">Useful links</a></li>
</ul>'''
index.exposed = True
class JokePage:
def index(self):
return '''
<p>"In Python, how do you create a string of random
characters?" -- "Read a Perl file!"</p>
<p>[<a href="../">Return</a>]</p>'''
index.exposed = True
class LinksPage:
def __init__(self):
# Request handler objects can create their own nested request
# handler objects. Simply create them inside their __init__
# methods!
self.extra = ExtraLinksPage()
def index(self):
# Note the way we link to the extra links page (and back).
# As you can see, this object doesn't really care about its
# absolute position in the site tree, since we use relative
# links exclusively.
return '''
<p>Here are some useful links:</p>
<ul>
<li>
<a href="http://www.cherrypy.org">The CherryPy Homepage</a>
</li>
<li>
<a href="http://www.python.org">The Python Homepage</a>
</li>
</ul>
<p>You can check out some extra useful
links <a href="./extra/">here</a>.</p>
<p>[<a href="../">Return</a>]</p>
'''
index.exposed = True
class ExtraLinksPage:
def index(self):
# Note the relative link back to the Links page!
return '''
<p>Here are some extra useful links:</p>
<ul>
<li><a href="http://del.icio.us">del.icio.us</a></li>
<li><a href="http://www.cherrypy.org">CherryPy</a></li>
</ul>
<p>[<a href="../">Return to links page</a>]</p>'''
index.exposed = True
# Of course we can also mount request handler objects right here!
root = HomePage()
root.joke = JokePage()
root.links = LinksPage()
# Remember, we don't need to mount ExtraLinksPage here, because
# LinksPage does that itself on initialization. In fact, there is
# no reason why you shouldn't let your root object take care of
# creating all contained request handler objects.
import os.path
tutconf = os.path.join(os.path.dirname(__file__), 'tutorial.conf')
if __name__ == '__main__':
# CherryPy always starts with app.root when trying to map request URIs
# to objects, so we need to mount a request handler root. A request
# to '/' will be mapped to HelloWorld().index().
cherrypy.quickstart(root, config=tutconf)
else:
# This branch is for the test suite; you can ignore it.
cherrypy.tree.mount(root, config=tutconf)
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