python - How to make file upload facultative with Deform and Colander? -


i render form containing sequence of files, representing different images of product. providing files should facultative, form should validate in absence of files. how can ?

here colander schema use: 

    import colander     import deform     deform import form     deform import validationfailure     deform.interfaces import fileuploadtempstore        tmpstore = fileuploadtempstore()      class image(colander.schema):         image = colander.schemanode(             deform.filedata(),             widget=deform.widget.fileuploadwidget(tmpstore)             )       class images(colander.sequenceschema):         images = image()      class productschema(colander.schema):         completename = colander.schemanode(colander.string(), title="complete name")          description = colander.schemanode(colander.string(),                                   widget = deform.widget.textareawidget())          images = images()       schema = productschema()     form = form(schema, buttons=("submit", ))

i tried add 'missing' argument like: 

image = colander.schemanode(         deform.filedata(),         missing = ???         widget=deform.widget.fileuploadwidget(tmpstore)         )

i think functional when 

missing={'filename': none, 'uid':none}

but i'm not sure it's correct way it...

thanks !

you might try "missing = colander.null".


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