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[英]Select attributes on repository.find() with relations (TypeORM)
[英]TypeORM can find() with relations
我第一次使用 TypeORM,不幸的是必须使用 JavaScript。 这些文档主要关注 TypeScript,所以我在尝试获取包含所有相关其他条目的条目时遇到了困难。
module.exports = {
name: "recordings",
columns: {
id: {
type: "uuid",
primary: true,
generated: "uuid"
},
title: {
type: "text",
unique: true,
nullable: false
},
file: {
type: "text",
unique: true,
nullable: false
}
},
relations: {
recordingAnnotations: {
target: "recordingAnnotations",
type: "one-to-many",
joinTable: true,
}
}
};
module.exports = {
name: "recordingAnnotations",
columns: {
id: {
type: "uuid",
primary: true,
generated: "uuid"
},
startsAt: {
type: "int",
nullable: false
},
endsAt: {
type: "int",
nullable: false
},
content: {
type: "text",
unique: true,
nullable: false
}
},
relations: {
recording: {
target: "recordings",
type: "many-to-one",
nullable: false,
onDelete: "CASCADE"
}
}
};
现在我想找到一个带有所有注释的recording
条目。
const repo = conn.getRepository(Recording.name);
const result = await repo.find({
where: { id },
relations: [ "recordingAnnotations" ]
});
我试图得到的结果如下所示:
id: "some-uuid",
title: "Recording 1",
file: "some-uuid",
annotations: [
{ id: "some-uuid", startsAt: 0, endsAt: 10, content: "Hello!" },
{ id: "some-uuid", startsAt: 20, endsAt: 25, content: "Bye!" },
]
我得到的错误:
类型错误:无法读取未定义的属性
'joinColumns'
在记录模式中,无需 joinTable,因为它只能处理多对多关系,
relations: {
recordingAnnotations: {
target: "recordingAnnotations",
type: "one-to-many",
inverseSide: 'recording'
}
}
我们需要将 inverseSide 指定为recording
,因为我们在recordingAnnotations
注释模式中添加了recording
关系并且 ManyToOne 将外键放在当前实体表中。
在记录注释模式中,
relations: {
recording: {
target: "recordings",
type: "many-to-one",
nullable: false,
onDelete: "CASCADE",
joinColumn: true
}
}
我们需要指定joinColumn,它将在recordingAnnotations
表中添加recordingId
(外键)。
另外,这是使用一对多关系的完整示例: https : //github.com/typeorm/typeorm/issues/2503#issuecomment-404834720
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