I recently spent about an hour struggling with an Interface schema used to construct the usual add and edit forms.
1) On a Text or SourceText field (and presumably others, but I haven't checked), if you set both a 'default' and a 'missing_value' (that are identical), the add form does not pre-fill the field. A workaround in my case is to make a trivial difference between the two values. This strikes me as being an overly helpful misfeature. 2) I have not yet found a way to set a 'missing_value' on an Int field (for example 'missing_value=0') without causing an error: ConfigurationError: ('Invalid value for', 'class', "(None, (<type 'int'>, <type 'long'>))") I suspect this one is an actual bug. - Michael R. Bernstein michaelbernstein.com
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