code: def create(self, model):
          
  
          signals.pre_create.send(model.__class__, model=model)
          signals.pre_save.send(model.__class__, model=model)
  
          param = self.to_pg(model)
          query = """
                  INSERT INTO {table} ({dirty_cols})
                  VALUES ({dirty_vals})
                  RETURNING {cols};
                  """
  
          query = query.format(
              cols=self.field_cols(model),
              dirty_cols=self.dirty_cols(model),
              dirty_vals=self.dirty_vals(model),
              table=model.rtype,
          )
  
          result = self.query(query, param=param)
  
          signals.post_create.send(model.__class__, model=model)
          signals.post_save.send(model.__class__, model=model)
  
          return model.merge(result[0], clean=True)
docs: Given a model object instance create it