Re: Can a schema validator make new variables out of other variables?

>From: formencode-discuss-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
>[mailto:formencode-discuss-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of
>Matthew Wilson
>I have a date field in my form and a time field in my form.
>
>I want to store a datetime in my database, so I'm manually combining
>these two fields in my app code.  Is there any way to do this
>automatically with form code?

You could write your own validator to be used in "chained_validators":

class FieldJoiner(FancyValidator):
    """
    Joins fields into one by using the specified delimiter.

    ::

        >>> fj = PostalCodeInCountryFormat('fdatetime', ' ', ('fdate', 'ftime'))
        >>> fj.to_python({'fdate': '2008-08-08', 'ftime': '08:08:08'})
        {'fdatetime': '2008-08-08 08:08:08', 'fdate': '2008-08-08', 'ftime': '08:08:08'}
        >>> fj.to_python({'country': 'DE', 'zip': '30029'})
        {'country': 'DE', 'zip': '30029'}
    """

    result_fieldname = 'fdatetime'
    delimiter = ', '
    fields_to_be_joined = 'zip'
    __unpackargs__ = ('result_fieldname', 'delimiter', 'fields_to_be_joined')

    def validate_python(self, fields_dict, state):
        jl = [fields_dict[key] for key in self.fields_to_be_joined \
              if key in fields_dict]
        fields_dict[self.result_fieldname] = self.delimiter.join(jl)

... looks handy. Does it do the job?

-- Mark
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