code: def insert(self, **data):
          
          if self.where_clause:
              raise Invalid("Cannot insert with 'where' clause.")
          # Ensure that order is preserved
          data = data.items()
          cmd = "insert into {table} ({attrs}) values ({values})".format(
              table=self.table_name,
              attrs=", ".join(entry[0] for entry in data),
              values=", ".join(["?"] * len(data)),
          )
          handle = Repo.db.execute(cmd, [entry[1] for entry in data])
          # Return the id of the added row
          return handle.lastrowid
docs: Insert the passed +data+ into the table. Raises Invalid if a where
          clause is present (i.e. no INSERT INTO table WHERE)