List on a wizard stateview

Support Developer
1

Hi,
I am having some issues using tryton 4.6 module on tryton 5.0
The issue is with a One2Many list based on a ModelView class.
I tried to scrap an example of the code, so I don’t have to copy all the original.
The idea behind is to fullfill a list (the one2many) with something.

class Element(ModelView):
   'Element'
    __name__ = 'list.element'

    foo = fields.Char("Foo")

class ListElement(ModelView):
    'List Element'
    __name__ = 'list.list'

    elements = fields.One2Many('list.element',None,'Cobertura',
        readonly=True)

class MyWizard(Wizard):
    'The wiz'
    __name__ = 'fill.list'

    start = 'start'
    start = StateView(....)
    check_existence = StateTransition()
    found = StateView(....) # asociated to a view related to ListElement model
    not_found = StateView(....)
    show_results = StateAction(....)

    def transition_check_existence(self):
        Party = Pool().get('party.party')
        (.....)
        parties = Party.search(something)
        names = []
        if parties:
            name = [x.name for x in parties]
            self.found.names = names
            return 'found'
        return 'not found'
    
    def default_found(self):
        elements = []
        element = {}
        for name in self.found.names:
            element['name'] = name
            elements.append(name)
            element = {}
        return{
                'elements': elements,
                }
            
    def do_show_results(self):
        (...)

When I try to run the wizard, it’s ok on the start state, but in the found state gives me this error:

File "/home/fran/.local/lib/python3.6/site-packages/tryton/common/common.py", line 999, in process
    self.callback(return_)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/wizard.py", line 108, in callback
    self.update(view['fields_view'], view['buttons'])
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/wizard.py", line 361, in update
    super(WizardDialog, self).update(view, buttons)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/wizard.py", line 202, in update
    self.screen.add_view(view)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/screen/screen.py", line 581, in add_view
    self, view_id, view['type'], xml_dom, view.get('field_childs'))
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/__init__.py", line 74, in parse
    return ViewForm(view_id, screen, root)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/form.py", line 413, in __init__
    super().__init__(view_id, screen, xml)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/__init__.py", line 35, in __init__
    ).parse(xml)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/__init__.py", line 130, in parse
    parser(node, node_attrs)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/form.py", line 196, in _parse_form
    self.parse_child(node, container)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/form.py", line 203, in parse_child
    self.parse(child)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/__init__.py", line 130, in parse
    parser(node, node_attrs)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/form.py", line 341, in _parse_group
    self.parse_child(node, group)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/form.py", line 203, in parse_child
    self.parse(child)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/__init__.py", line 130, in parse
    parser(node, node_attrs)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/form.py", line 341, in _parse_group
    self.parse_child(node, group)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/form.py", line 203, in parse_child
    self.parse(child)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/__init__.py", line 130, in parse
    parser(node, node_attrs)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/form.py", line 213, in _parse_field
    widget = self.WIDGETS[attributes['widget']](self.view, attributes)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/form_gtk/one2many.py", line 165, in __init__
    limit=None)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/screen/screen.py", line 139, in __init__
    self.switch_view()
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/screen/screen.py", line 514, in switch_view
    self.load_view_to_load()
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/screen/screen.py", line 540, in load_view_to_load
    self.add_view_id(view_id, view_type)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/screen/screen.py", line 553, in add_view_id
    return self.add_view(view)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/screen/screen.py", line 581, in add_view
    self, view_id, view['type'], xml_dom, view.get('field_childs'))
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/__init__.py", line 72, in parse
    return ViewTree(view_id, screen, root, children_field)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/list.py", line 451, in __init__
    super().__init__(view_id, screen, xml)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/__init__.py", line 35, in __init__
    ).parse(xml)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/__init__.py", line 130, in parse
    parser(node, node_attrs)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/list.py", line 287, in _parse_tree
    self.parse(child)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/__init__.py", line 130, in parse
    parser(node, node_attrs)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/list.py", line 291, in _parse_field
    widget = self.WIDGETS[attributes['widget']](self.view, attributes)
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/gui/window/view_form/view/list_gtk/widget.py", line 932, in __init__
    self.init_selection()
  File "/home/fran/.local/lib/python3.6/site-packages/tryton/common/selection.py", line 43, in init_selection
    selection.sort(key=operator.itemgetter(1))

TypeError: '<' not supported between instances of 'str' and 'NoneType'

Thanks in advance

2

This is not supported. You must use always the same series.

3

Yes, I know. It’s a module from my own.

I’m trying to migrate the code from 4.6 to 5.0. I found what lines are the ones wich cause the error, but I can’t interpret the error log.
Apparently, it’s trying to order the one2many list trough an inexistent field (the "`
TypeError: ‘<’ not supported between instances of ‘str’ and ‘NoneType’ " line on the error log).

Don’t know why, but in this series it doesn’t work as it did it on the others.

4

This is an error raised on python3 when comparing None to a string. On python2 this did not cause any error.

For example (on python2):

>>> '' < None
False

but on python3:

>>> '' < None
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: '<' not supported between instances of 'str' and 'NoneType'

Probably removing the non existent field from the order will solve the issue.

5

Nice. We are getting closer then.
The question itself will be wich field is that one.

Changing the one2many target to a ModelSQL class (party.party), it gives me no error. Could it be possible that using a ModelView class is the origin of that error? Is there any tip/hint to solve this?

Thanks

6

If you use a ModelView you should use None as target of the relation.

7

Indeed, I am using a None as the field of the model target (see the example code)

8

So probably there is an error on the model definition or something else.

I’m sorry but without the full code I can not provide more advices.

9

You can not use One2Many with None on a wizard, you must use a Many2Many with a couple of None’s.
But the error is not about that but about a selection widget that is used with values having None as string.

10

What does the server-side say? You have now only given the error on the client-side.

11

This was the answer!!! Every answer get me closer and closer to the final solution.

I did a mistake on one fields.Selection.
I put a tuple like (‘’, None) instead of (None, ‘’).

Like pokoli saids, the code works fine on python2, but returns an error on python3

And like cedric saids, it was about a selection field.

Thank you all!

12

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