/usr/share/pyshared/zope/formlib/errors.txt is in python-zope.formlib 4.0.5-0ubuntu5.
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Error handling
==============
These are a couple of functional tests that were written on-the-go ... In the
future this might become more extensive ...
Displaying invalidation errors
==============================
Validation errors, e.g. cause by invariants, are converted into readable text
by adapting them to IWidgetInputErrorView:
>>> from zope.publisher.browser import TestRequest
>>> from zope.interface.exceptions import Invalid
>>> from zope.component import getMultiAdapter
>>> from zope.formlib.interfaces import IWidgetInputErrorView
>>> error = Invalid("You are wrong!")
>>> message = getMultiAdapter((error, TestRequest()),
... IWidgetInputErrorView).snippet()
>>> message
u'<span class="error">You are wrong!</span>'
Interface invariant methods raise zope.interface.Invalid exception. Test if
this exception gets handled by the error_views.
>>> myError = Invalid('My error message')
>>> import zope.formlib.form
>>> mybase = zope.formlib.form.FormBase(None, TestRequest())
>>> mybase.errors = (myError,)
>>> save = mybase.error_views()
>>> save.next()
u'<span class="error">My error message</span>'
Now we need to set up the translation framework:
>>> from zope import component, interface
>>> from zope.i18n.interfaces import INegotiator
>>> class Negotiator:
... interface.implements(INegotiator)
... def getLanguage(*ignored): return 'test'
>>> component.provideUtility(Negotiator())
>>> from zope.i18n.testmessagecatalog import TestMessageFallbackDomain
>>> component.provideUtility(TestMessageFallbackDomain)
And yes, we can even handle an i18n message in an Invalid exception:
>>> from zope.i18nmessageid import MessageFactory
>>> _ = MessageFactory('my.domain')
>>> myError = Invalid(_('My i18n error message'))
>>> mybase = zope.formlib.form.FormBase(None, TestRequest())
>>> mybase.errors = (myError,)
>>> save = mybase.error_views()
>>> save.next()
u'<span class="error">[[my.domain][My i18n error message]]</span>'
Displaying widget input errors
==============================
WidgetInputError exceptions also work with i18n messages:
>>> from zope.formlib.interfaces import WidgetInputError
>>> myError = WidgetInputError(
... field_name='summary',
... widget_title=_(u'Summary'),
... errors=_(u'Foo'))
>>> mybase = zope.formlib.form.FormBase(None, TestRequest())
>>> mybase.errors = (myError,)
>>> save = mybase.error_views()
>>> save.next()
u'[[my.domain][Summary]]: <span class="error">[[my.domain][Foo]]</span>'
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