Question

我正在使用Sequelize进行节点项目，但我在以Sequelize方式转换查询时遇到了一些问题。

场景：我有2个表（用户和事件），通过 UserEvent 表具有n：m关系。在 UserEvent 表中有 is_creator 属性;我需要的是一个具有事件名称，事件ID和is_creator字段的对象。

示例：

[{
    id: 1,
    name: "Event",
    is_creator: true
}]

以下是查询：

SELECT `Event`.`id`,`Event`.`name` as `Name`, `UserEvents`.`is_creator` AS `is_creator` FROM `Events` AS `Event` INNER JOIN (`UserEvents` INNER JOIN `Users` AS `Users` ON `Users`.`id` = `UserEvents`.`UserId`) ON `Event`.`id` = `UserEvents`.`EventId` AND `Users`.`id` = 1;

不幸的是，我无法翻译＆＃34;它是Sequelize。

实际代码：

var queryOptions: FindOptions = {
            include: [
                {
                    model: db.User,
                    where: {
                        id: user.id
                    }
                }
            ],
        };

执行查询：

SELECT `Event`.`id`, `Event`.`uuid`, `Event`.`image`, `Event`.`name`, `Event`.`start_at`, `Event`.`end_at`, `Event`.`location`, `Event`.`description`, `Event`.`createdAt`, `Event`.`updatedAt`, `Users`.`id` AS `Users.id`, `Users`.`uuid` AS `Users.uuid`, `Users`.`email` AS `Users.email`, `Users`.`password` AS `Users.password`, `Users`.`firstName` AS `Users.firstName`, `Users`.`lastName` AS `Users.lastName`, `Users`.`activationCode` AS `Users.activationCode`, `Users`.`resetCode` AS `Users.resetCode`, `Users`.`active` AS `Users.active`, `Users`.`dob` AS `Users.dob`, `Users`.`image` AS `Users.image`, `Users`.`createdAt` AS `Users.createdAt`, `Users`.`updatedAt` AS `Users.updatedAt`, `Users.UserEvent`.`uuid` AS `Users.UserEvent.uuid`, `Users.UserEvent`.`is_creator` AS `Users.UserEvent.is_creator`, `Users.UserEvent`.`createdAt` AS `Users.UserEvent.createdAt`, `Users.UserEvent`.`updatedAt` AS `Users.UserEvent.updatedAt`, `Users.UserEvent`.`UserId` AS `Users.UserEvent.UserId`, `Users.UserEvent`.`EventId` AS `Users.UserEvent.EventId` FROM `Events` AS `Event` INNER JOIN (`UserEvents` AS `Users.UserEvent` INNER JOIN `Users` AS `Users` ON `Users`.`id` = `Users.UserEvent`.`UserId`) ON `Event`.`id` = `Users.UserEvent`.`EventId` AND `Users`.`id` = 1;

提前感谢您的合作！

Answer 1

是否要限制查询返回的列数？

您可以查看attributes选项。您可以指定所需的表字段。

例如，如果您想要用户的id，email和firstName，则可以这样指定。

var queryOptions: FindOptions = {
        include: [
            {
                model: db.User,
                where: {
                    id: user.id
                },
                attributes: ['id', 'email', 'firstName']
            }
        ],
    };

您可以类似地为UserEvents表添加属性选项。

PS：我目前没有足够的声誉来添加对问题的评论。否则我会做到这一点。

Sequelize - 查询Sequelize方法

1 个答案: