Question

我正在研究一个项目，在该项目中，每个模型我们有两个共同的属性

Created_ts
CREATED_BY

我想添加一个基类，我想在其中设置这些属性，我尝试使用

class BaseModel < ActiveRecords::Base

end

class Person < BaseModel

end

当我创建Person模型的实例时，它会给出异常，我不确定它为什么会给出异常，可能是因为它正在寻找表BaseModels。

任何人都可以建议，如何做到这一点。

例外：

PG::UndefinedTable: ERROR:  relation "base_models" does not exist
LINE 5:                WHERE a.attrelid = '"base_models"'::regclass
                                          ^
:               SELECT a.attname, format_type(a.atttypid, a.atttypmod),
                     pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod
                FROM pg_attribute a LEFT JOIN pg_attrdef d
                  ON a.attrelid = d.adrelid AND a.attnum = d.adnum
               WHERE a.attrelid = '"base_models"'::regclass
                 AND a.attnum > 0 AND NOT a.attisdropped
               ORDER BY a.attnum

ActiveRecord::StatementInvalid: PG::UndefinedTable: ERROR:  relation "base_models" does not exist
LINE 5:                WHERE a.attrelid = '"base_models"'::regclass
                                          ^
:               SELECT a.attname, format_type(a.atttypid, a.atttypmod),
                     pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod
                FROM pg_attribute a LEFT JOIN pg_attrdef d
                  ON a.attrelid = d.adrelid AND a.attnum = d.adnum
               WHERE a.attrelid = '"base_models"'::regclass
                 AND a.attnum > 0 AND NOT a.attisdropped
               ORDER BY a.attnum

Answer 1

我们只需要将基类作为抽象类

更多参考资料寻求以下链接

Rails extending ActiveRecord::Base

如何创建我们自己的基类并从基类而不是ActiveRecord :: Base继承所有模型

1 个答案: