Question

我开始将旧的堆栈服务器迁移到GraphQL，所以我发现阿波罗graphql docs建议您将获取和处理数据的功能放在请求上下文中，如下所示：

   export const generateUserModel = ({ user }) => ({
      getAll: () => { /* fetching/transform logic for all users */ },
      getById: (id) => { /* fetching/transform logic for a single user */ },
      getByGroupId: (id) => { /* fetching/transform logic for a group of users */ },
    });   

   context: ({ req }) => {
    // get the user token from the headers
    const token = req.headers.authentication || '';

    // try to retrieve a user with the token
    const user = getUser(token);

    // optionally block the user
    // we could also check user roles/permissions here
    if (!user) throw new AuthorizationError('you must be logged in to query this schema');  

    // add the user to the context
    return {
        user,
        models: {
            User: generateUserModel({ user }),
            ...
        }
        };
    },

但是如果generateUserModel返回600行代码（函数），又还有generatePostModel，generateCategoryModel，...等等怎么办？不会影响应用程序的内存使用，因为此代码是针对每个请求生成的。

如果以这种方式实现，会更糟吗？

export class UserModel {
    constructor(user){
        this.user=user
    }
    getAll=() => { /* fetching/transform logic for all users */ },
    getById=(id) => { /* fetching/transform logic for a single user */ },
    getByGroupId=(id) => { /* fetching/transform logic for a group of users */ },
}
context: ({ req }) => {
    // get the user token from the headers
    const token = req.headers.authentication || '';

    // try to retrieve a user with the token
    const user = getUser(token);

    // optionally block the user
    // we could also check user roles/permissions here
    if (!user) throw new AuthorizationError('you must be logged in to query this schema');  

    // add the user to the context
    return {
        user,
        models: {
            User: new UserModel( user ),
            ...
        }
    };
},

GraphQL最佳实践

0 个答案: