[Zope3-Users] tuple and list widgets for z3c.form

Mon Jan 12 18:19:49 EST 2009

Hi Z3 community,

I've written tuple and list widgets for the z3c.form framework, i.e.
widgets for a schema-fields like

some_tuple_field = zope.schema.Tuple(
	title = u"Tuple of text lines",
	value_type = zope.schema.Text(title = u"Text line",),
	)

other_list_field = zope.schema.List(
	title = u"List of Integers",
	value_type = zope.schema.Int(title = u"Integer",),
	)

Maybe someone is interested in it and wants to reuse or improve it.

The reason for me to write these widgets was that I liked the z3c.form
package but my content objects have lots of tuples--my app is a sort of
bibtex-database based on zope 3. So I decided to try to write the widget
that was missing instead of lots of subforms...

The tarball contains the widgets and a little demo app. The demo app
comes with a skin called "SequenceDemo" and lets you add, edit and
display tuples of integers. To try it, you have to include
the sequence_demo.zcml in your config.
To reuse the widgets in other apps you have to include sequence.zcml

There are still 2 bugs that I know:

1) Reporting errors of subwidgets: The toFieldValue-method of the
dataconverter looks up a dataconverter for the subwidgets and then uses
it to convert and validate the values from the subwidgets. It collects
the exceptions that occur on the conversion and finally raises the first
exception that occured (see comment on code in sequence.py) When the
validation of the subwidget fails there is a traversal error for a
'label' attribute on a widget. I did not yet dig that deep into the
z3c.form framework to solve this. See traceback below.

2) If the schema defines a default value for the value_type of a tuple
or list, this default value is displayed in edit and display forms
instead of the actual value. If you want to reproduce this error,
uncomment the default = 1 statement in IIntegerTuple (sequence_demo.py).
I think to squashbug one would have to reimplement some steps of the
update method which currently reuses the logic of the update method of
z3c.form.widget.Widget (I think Step 1.2.1) Or: Maybe one yust would
have to write a datamanager.

Cheers,
Christian

PS. Here is the traceback for the first bug (I entered an integer that
exceeds the max bound)

Traceback (most recent call last):
  Module zope.publisher.publish, line 133, in publish
    result = publication.callObject(request, obj)
  Module zope.app.publication.zopepublication, line 166, in callObject
    return mapply(ob, request.getPositionalArguments(), request)
  Module zope.publisher.publish, line 108, in mapply
    return debug_call(obj, args)
   - __traceback_info__: <security proxied
z3c.pagelet.zcml.IntegerTupleAddForm instance at 0xb15b22cc>
  Module zope.publisher.publish, line 114, in debug_call
    return obj(*args)
  Module z3c.formui.layout, line 51, in __call__
    return layout(self)
  Module zope.app.pagetemplate.viewpagetemplatefile, line 51, in __call__
    sourceAnnotations=getattr(debug_flags, 'sourceAnnotations', 0),
  Module zope.pagetemplate.pagetemplate, line 115, in pt_render
    strictinsert=0, sourceAnnotations=sourceAnnotations)()
  Module zope.tal.talinterpreter, line 271, in __call__
    self.interpret(self.program)
  Module zope.tal.talinterpreter, line 343, in interpret
    handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 742, in do_insertStructure_tal
    structure = self.engine.evaluateStructure(expr)
  Module zope.tales.tales, line 696, in evaluate
    return expression(self)
   - /home/clueck/tools/sequencewidget/src/sequencewidget/sequence_demo.pt
   - Line 26, Column 4
   - Expression: <StringExpr u'pagelet'>
   - Names:
      {'args': (),
       'context': <zope.app.folder.folder.Folder object at 0xb7049e2c>,
       'default': <object object at 0xb7dd3518>,
       'loop': {},
       'nothing': None,
       'options': {},
       'repeat': {},
       'request': <zope.publisher.browser.BrowserRequest instance
URL=http://localhost:8080/++skin++SequenceDemo/@@addIntegerTuple.html>,
       'template':
<zope.app.pagetemplate.viewpagetemplatefile.ViewPageTemplateFile object
at 0xb69764ec>,
       'view': <z3c.pagelet.zcml.IntegerTupleAddForm object at 0xb15b22cc>,
       'views': <zope.app.pagetemplate.viewpagetemplatefile.ViewMapper
object at 0xb15b2b4c>}
  Module zope.contentprovider.tales, line 80, in __call__
    return provider.render()
  Module z3c.pagelet.provider, line 44, in render
    return self.__parent__.render()
  Module z3c.formui.form, line 44, in render
    return template(self)
  Module zope.app.pagetemplate.viewpagetemplatefile, line 51, in __call__
    sourceAnnotations=getattr(debug_flags, 'sourceAnnotations', 0),
  Module zope.pagetemplate.pagetemplate, line 115, in pt_render
    strictinsert=0, sourceAnnotations=sourceAnnotations)()
  Module zope.tal.talinterpreter, line 271, in __call__
    self.interpret(self.program)
  Module zope.tal.talinterpreter, line 343, in interpret
    handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 858, in do_defineMacro
    self.interpret(macro)
  Module zope.tal.talinterpreter, line 343, in interpret
    handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 858, in do_defineMacro
    self.interpret(macro)
  Module zope.tal.talinterpreter, line 343, in interpret
    handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 533, in do_optTag_tal
    self.do_optTag(stuff)
  Module zope.tal.talinterpreter, line 518, in do_optTag
    return self.no_tag(start, program)
  Module zope.tal.talinterpreter, line 513, in no_tag
    self.interpret(program)
  Module zope.tal.talinterpreter, line 343, in interpret
    handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 954, in do_defineSlot
    self.interpret(block)
  Module zope.tal.talinterpreter, line 343, in interpret
    handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 954, in do_defineSlot
    self.interpret(block)
  Module zope.tal.talinterpreter, line 343, in interpret
    handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 533, in do_optTag_tal
    self.do_optTag(stuff)
  Module zope.tal.talinterpreter, line 518, in do_optTag
    return self.no_tag(start, program)
  Module zope.tal.talinterpreter, line 513, in no_tag
    self.interpret(program)
  Module zope.tal.talinterpreter, line 343, in interpret
    handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 858, in do_defineMacro
    self.interpret(macro)
  Module zope.tal.talinterpreter, line 343, in interpret
    handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 852, in do_condition
    self.interpret(block)
  Module zope.tal.talinterpreter, line 343, in interpret
    handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 858, in do_defineMacro
    self.interpret(macro)
  Module zope.tal.talinterpreter, line 343, in interpret
    handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 852, in do_condition
    self.interpret(block)
  Module zope.tal.talinterpreter, line 343, in interpret
    handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 821, in do_loop_tal
    self.interpret(block)
  Module zope.tal.talinterpreter, line 343, in interpret
    handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 852, in do_condition
    self.interpret(block)
  Module zope.tal.talinterpreter, line 343, in interpret
    handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 533, in do_optTag_tal
    self.do_optTag(stuff)
  Module zope.tal.talinterpreter, line 518, in do_optTag
    return self.no_tag(start, program)
  Module zope.tal.talinterpreter, line 513, in no_tag
    self.interpret(program)
  Module zope.tal.talinterpreter, line 343, in interpret
    handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 531, in do_optTag_tal
    self.no_tag(stuff[-2], stuff[-1])
  Module zope.tal.talinterpreter, line 513, in no_tag
    self.interpret(program)
  Module zope.tal.talinterpreter, line 343, in interpret
    handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 620, in do_insertText_tal
    text = self.engine.evaluateText(stuff[0])
  Module zope.tales.tales, line 704, in evaluateText
    text = self.evaluate(expr)
  Module zope.tales.tales, line 696, in evaluate
    return expression(self)
   -
/home/clueck/.buildout-eggs/z3c.formui-1.4.2-py2.4.egg/z3c/formui/div-form.pt
   - Line 40, Column 14
   - Expression: <PathExpr standard:u'error/widget/label'>
   - Names:
      {'args': (),
       'context': <zope.app.folder.folder.Folder object at 0xb7049e2c>,
       'default': <object object at 0xb7dd3518>,
       'loop': {},
       'nothing': None,
       'options': {},
       'repeat': {},
       'request': <zope.publisher.browser.BrowserRequest instance
URL=http://localhost:8080/++skin++SequenceDemo/@@addIntegerTuple.html>,
       'template':
<zope.app.pagetemplate.viewpagetemplatefile.ViewPageTemplateFile object
at 0xb69642ec>,
       'view': <z3c.pagelet.zcml.IntegerTupleAddForm object at 0xb15b22cc>,
       'views': <zope.app.pagetemplate.viewpagetemplatefile.ViewMapper
object at 0xb15b2aec>}
  Module zope.tales.expressions, line 217, in __call__
    return self._eval(econtext)
  Module zope.tales.expressions, line 194, in _eval
    ob = self._subexprs[-1](econtext)
  Module zope.tales.expressions, line 124, in _eval
    ob = self._traverser(ob, element, econtext)
  Module zope.app.pagetemplate.engine, line 68, in __call__
    request=request)
  Module zope.traversing.adapters, line 164, in traversePathElement
    return traversable.traverse(nm, further_path)
   - __traceback_info__: (<TupleSequenceWidget 'form.widgets.integers'>,
'label')
  Module zope.traversing.adapters, line 52, in traverse
    raise TraversalError(subject, name)
   - __traceback_info__: (<TupleSequenceWidget 'form.widgets.integers'>,
'label', [])
TraversalError: (<TupleSequenceWidget 'form.widgets.integers'>, 'label')

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