322     @property

   323     def form_needs_multipart(self):

   324         """true if the form needs enctype=multipart/form-data"""

   325         if super(AutomaticEntityForm, self).form_needs_multipart:

   326             return True

   327         # take a look at inlined forms to check (recursively) if they

   328         # need multipart handling.

   329         # XXX: this is very suboptimal because inlined forms will be

   330         #      selected / instantiated twice : here and during form rendering.

   331         #      Potential solutions:

   332         #       -> use subforms for inlined forms to get easiser access

   333         #       -> use a simple onload js function to check if there is

   334         #          a input type=file in the form

   335         #       -> generate the <form> node when the content is rendered

   336         #          and we know the correct enctype (formrenderer's w attribute

   337         #          is not a StringIO)

   338         for rschema, targettypes, role in self.inlined_relations():

   339             # inlined forms don't handle multiple target types

   340             if len(targettypes) != 1:

   341                 continue

   342             targettype = targettypes[0]

   343             if self.should_inline_relation_form(rschema, targettype, role):

   344                 entity = self.vreg['etypes'].etype_class(targettype)(self.req)

   345                 subform = self.vreg['forms'].select('edition', self.req, entity=entity)

   346                 if subform.form_needs_multipart:

   347                     return True

   348         return False