使用feathers-client并化多对多关系 [英] Using feathers-client and sequelize many-to-many relation

问题描述

我正在尝试使用羽毛从n:m关联中获取数据.我在前端使用React，并使用feathers-client和socketio连接到羽毛.

I'm trying to get data from an n:m association using feathers. I'm using react for my front-end and connecting to feathers using the feathers-client and socketio.

    //connection string where the feathers api is running
const host = 'http://localhost:3030';


const socket = io(host, {
    transports: ['websocket'],
    forceNew: true
});

// construct feathers app
export const client = feathers()
    .configure(hooks())
    .configure(auth({ storage: window.localStorage }))
    .configure(socketio(socket));

但是当我使用myService.find()时，包含参数将从hook.params中删除

But when I use the myService.find() the include param gets removed from the hook.params

function (hook) {
        hook.params.sequelize = {
          include: [{ model: hook.app.services.users.Model,
                      as: 'teamOwner'
                      },{
                      model: hook.app.services.users.Model,
                      as: 'Trainer'
                      },{
                      model: hook.app.services.users.Model,
                      as: 'Member'
            }
          ]
        };
      return Promise.resolve(hook);
    }

当我在before挂钩中对其进行配置时，它可以正常工作，但是每次使用该服务时，所有表都将连接在一起.因此，我想在查询中指定要包括的表.像这样

When I configure it in my before hook it works fine, but then every time the service us used all the tables are joined together. So I want to specify in the query which tables to include. Like this

client.service('team').find({
                include: [
                { model:client.service('users').Model,
                    as: 'teamOwner'
                },{
                    model:client.service('users').Model,
                    as: 'Trainer'
                },{
                    model:client.service('users').Model,
                    as: 'Member'
                }],
                query: {
                    $sort: {
                        id: 1
                    }
                }
            })

预先感谢

推荐答案

由于只有params.query在客户端和服务器之间传递，因此最好的方法通常是创建一个自定义查询参数，以指示要包含的内容:

Since only params.query is passed between the client and the server the best way is usually to create a custom query parameter that indicates what you want to include:

function (hook) {
  const { $include } = hook.params.query;

  // Remove from the query so that it doesn't get included
  // in the actual database query
  delete hook.params.query.$include;

  const sequelize = {
    include: []
  };

  if(Array.isArray($include)) {
    $include.forEach(name => {
      sequelize.include.push({
        model: hook.app.services.users.Model,
        as: name
      });
    });
  }
  return Promise.resolve(hook);
}

现在，客户端可以在查询中指出他们想要的内容，例如{ query: { $include: [ 'teamOwner', 'Trainer' ] } }

Now the client can indicate what they want in the query, e.g. { query: { $include: [ 'teamOwner', 'Trainer' ] } }

这篇关于使用feathers-client并化多对多关系的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！