Question

我想存储其输入字段可由用户编辑的Web表单的数据。输入字段可以采用字符串或整数数据（为简化起见），并且可以为任意数字。为此，我创建了以下结构：

class Post {
    public Id!: number;
    public FieldValues?: FieldValue[];
    public static associations: {
        FieldValues: Association<Post, FieldValue>
      };
}

interface FieldValue{
    public Id!: number;
    PostId: number;    
}

class StringData implements FieldValue{
    public Id!: number;
    public PostId: number;    
    public Value!: string;    
}

class IntegerData implements FieldValue{
    public Id!: number;
    public PostId: number;
    public Value!: number;
}

Post.init({...},
    {
        tableName: "Posts"    
    }
)
StringData.init({...},
    {
        tableName: "StringData"    
    }
)
IntegerData.init({...},
    {
        tableName: "IntegerData"    
    }
)

Post.hasMany(FieldValue, { // breaks
  sourceKey: "Id",
  foreignKey: "FieldId",
  as: "FieldValues"
})

StringData.belongsTo(Post, {
  foreignKey: "FieldId"
})

IntegerData.belongsTo(Post, {
  foreignKey: "FieldId"
})

显然我不能在关联中使用接口或抽象类。我想要实现的是：

const post = await Post.create()
const stringData = await StringData.create({ Value: "test string", PostId: post.Id })
const integerData = await IntegerData.create({ Value: 123, PostId: post.Id })

const _post = await Post.findByPk(post.id, {
      include: [Post.associations.FieldValues],
    })
_post.FieldValues = ["test string", 123] // expected output

任何帮助将不胜感激。

如何使用sequelize创建泛型类型关联

0 个答案: