Add basic support for Poser reports, list/create

tailbone/forms/core.py

@@ -674,10 +674,18 @@ class Form(object):
            case the validator pertains to the form at large instead of
            one of the fields.
 
+           TODO: what should the validator look like?
+
         :param validator: Callable validator for the node.
         """
         self.validators[key] = validator
 
+        # we normally apply the validator when creating the schema, so
+        # if this form already has a schema, then go ahead and apply
+        # the validator to it
+        if self.schema and key in self.schema:
+            self.schema[key].validator = validator
+
     def set_required(self, key, required=True):
         """
         Set whether or not value is required for a given field.