code: def _validate(self, conditions):
          
          allowed_keys = set(self.searchkeys)
          operators_set = set(self.operators.keys())
          for condition in conditions:
              if set(condition.keys()) != allowed_keys:
                  raise ze.ParamNotPassed(
                      "Keys must be all of: %s" % ", ".join(self.searchkeys)
                  )
              if condition.get("operator") not in operators_set:
                  raise ze.ParamNotPassed(
                      "You have specified an unknown operator: %s"
                      % condition.get("operator")
                  )
              # dict keys of allowed operators for the current condition
              permitted_operators = self.conditions_operators.get(
                  condition.get("condition")
              )
              # transform these into values
              permitted_operators_list = set(
                  [self.operators.get(op) for op in permitted_operators]
              )
              if condition.get("operator") not in permitted_operators_list:
                  raise ze.ParamNotPassed(
                      "You may not use the '%s' operator when selecting the '%s' condition. \nAllowed operators: %s"
                      % (
                          condition.get("operator"),
                          condition.get("condition"),
                          ", ".join(list(permitted_operators_list)),
                      )
                  )
docs: Validate saved search conditions, raising an error if any contain invalid operators