Ordering fields in colander based schemas

[David Bain]

What mechanism do I use to get a newly defined field called "category_type" to show up at the beginning of my form?

I'm working on a schema that looks like this:

from kotti.views.edit import ContentSchema, DocumentSchema


... snip ...


class CategorySchema(DocumentSchema):
    title = colander.SchemaNode(
        colander.String(),
        title=_(u'Short Note'),
        )

    category_type = colander.SchemaNode(
        colander.String(),
        title=_(u'Question Type'),
        validator=colander.OneOf(["radio", "checkbox", "text", "upload"]),
        widget=RadioChoiceWidget(values=[
            ["radio", _("Single")],
            ["checkbox", _("Multiple")],
            ["text", _("Paragraph")],
            ["upload", _("Upload")]])
        )

The result is a form that has the following structure:

Short Note ____________________

Description ____________________

Tags _________________________

Body __________________________

Category Type
[] Single

[] Multiple

[] Paragraph

[] Upload

I want it to look like this:

Category Type
[] Single

[] Multiple

[] Paragraph

[] Upload

Short Note ____________________

Description ____________________

Tags _________________________

Body __________________________

[David Bain]

To reply to my own question. It turns out that I can get this done easily using "insert_before",

see documentation with example here: http://docs.pylonsproject.org/projects/colander/en/latest/basics.html#inheriting-schemas

So I just did that:

    category_type = colander.SchemaNode(
        colander.String(),
        title=_(u'Question Type'),

        insert_before="title",

        validator=colander.OneOf(["radio", "checkbox", "text", "upload"]),
        widget=RadioChoiceWidget(values=[
            ["radio", _("Single")],
            ["checkbox", _("Multiple")],
            ["text", _("Paragraph")],
            ["upload", _("Upload")]])
        )