z3c.preference 0.2

0.2 (2012-02-23)

• Added form for preference categories, see Editing preference group trees.

0.1.1 (2010-07-17)

• Documented preconditions to use this package, see Using z3c.preference.

0.1.0 (2010-07-10)

• Initial Release.

Set up for tests

At first we have to define a preference interface:

>>> import zope.interface
>>> import zope.schema
>>> class IBackEndSettings(zope.interface.Interface):
...     """Backend User Preferences"""
...
...     email = zope.schema.TextLine(
...         title=u"E-mail Address",
...         description=u"E-mail address used to send notifications")
...
...     skin = zope.schema.Choice(
...         title=u"Skin",
...         description=u"The skin that should be used for the back end.",
...         values=['Hipp', 'Lame', 'Basic'],
...         default='Basic')
...
...     showLogo = zope.schema.Bool(
...         title=u"Show Logo",
...         description=u"Specifies whether the logo should be displayed.",
...         default=True)

The interface must be registered for preferences:

>>> from zope.configuration import xmlconfig
>>> import zope.preference
>>> context = xmlconfig.file('meta.zcml', zope.preference)

>>> context = xmlconfig.string('''
...     <configure
...         xmlns="http://namespaces.zope.org/zope"
...         i18n_domain="test">
...
...       <preferenceGroup
...           id="BackEndSettings"
...           title="Back End Settings"
...           schema="z3c.preference.README.IBackEndSettings"
...           />
...
...     </configure>''', context)

To access the forms a browser is needed, the user must be authorized as the preferences are stored in the principal annotations:

>>> from zope.app.wsgi.testlayer import Browser
>>> browser = Browser()
>>> browser.addHeader('Authorization', 'Basic mgr:mgrpw')

Editing preferences using browser

There is a namespace to access the preferences. On the page a form is displayed which shows the default values:

>>> browser.open('http://localhost/++preferences++/BackEndSettings')
>>> browser.getControl('E-mail Address').value
''
>>> browser.getControl('Skin').displayValue
['Basic']
>>> browser.getControl('yes').selected
True
>>> browser.getControl('no').selected
False

The values can be changed and submitting the form makes them persistent:

>>> browser.getControl('E-mail Address').value = 'me@example.com'
>>> browser.getControl('Skin').displayValue = ['Hipp']
>>> browser.getControl('no').click()
>>> browser.getControl('Apply').click()

After submitting the form gets displayed again and shows the changed values:

>>> 'Data successfully updated.' in browser.contents
True
>>> browser.getControl('E-mail Address').value
'me@example.com'
>>> browser.getControl('Skin').displayValue
['Hipp']
>>> browser.getControl('no').selected
True

Set up

At first we have to define some preference interfaces presenting the tree. In this example we think of a web application with some areas:

>>> import zope.interface
>>> import zope.schema
>>> class IGeneralSettings(zope.interface.Interface):
...     """General preferences"""
...
...     language = zope.schema.Choice(
...         title=u"Language",
...         description=u"The language which should be used for display.",
...         values=['German', 'English', 'Russian'],
...         default='German')

>>> class IRSSSettings(zope.interface.Interface):
...     """Preferences for the RSS area of the application."""
...
...     number = zope.schema.Int(
...         title=u"Item count",
...         description=u"Maximum number of items in each feed.")

>>> class ISearchSettings(zope.interface.Interface):
...     """Preferences for the search area of the application."""
...
...     store_searches = zope.schema.Bool(
...         title=u"Store searches?",
...         description=u"Should searches be kept for later use?",
...         default=True)

The interfaces must be registered for preferences:

>>> from zope.configuration import xmlconfig
>>> import zope.preference
>>> context = xmlconfig.file('meta.zcml', zope.preference)

>>> context = xmlconfig.string('''
...     <configure
...         xmlns="http://namespaces.zope.org/zope"
...         i18n_domain="test">
...
...       <preferenceGroup
...           id="app"
...           title="General Settings"
...           schema="z3c.preference.categories.IGeneralSettings"
...           category="true"
...           />
...
...       <preferenceGroup
...           id="app.rss"
...           title="RSS Settings"
...           schema="z3c.preference.categories.IRSSSettings"
...           category="false"
...           />
...
...       <preferenceGroup
...           id="app.search"
...           title="Search Settings"
...           schema="z3c.preference.categories.ISearchSettings"
...           category="false"
...           />
...
...     </configure>''', context)

To access the forms a browser is needed, the user must be authorized as the preferences are stored in the principal annotations:

>>> from zope.app.wsgi.testlayer import Browser
>>> browser = Browser()
>>> browser.addHeader('Authorization', 'Basic mgr:mgrpw')

Editing preference group trees using browser

There is a namespace to access the preferences. On the page a form is displayed which shows the default values:

>>> browser.open('http://localhost/++preferences++/app')
>>> browser.getControl('Language').displayValue
['German']
>>> browser.getControl('Item count').value
''
>>> browser.getControl('yes').selected
True
>>> browser.getControl('no').selected
False

The values can be changed and submitting the form makes them persistent:

>>> browser.getControl('Language').displayValue = ['English']
>>> browser.getControl('Item count').value = '20'
>>> browser.getControl('no').click()
>>> browser.getControl('Apply').click()

After submitting the form gets displayed again and shows the changed values:

>>> 'Data successfully updated.' in browser.contents
True
>>> browser.getControl('Language').displayValue
['English']
>>> browser.getControl('Item count').value
'20'
>>> browser.getControl('no').selected
True