Question

在我的Cloud Firestore数据库中，始终注册一个用户，该数据库存储事件发生的时间：

const p = usersReference.add({ 
    ...,
    registerTime: admin.firestore.FieldValue.serverTimestamp(), 
    ...
});

我的目标是创建另一个云功能，该功能将用户作为输入并在用户注册至少有5天后返回：

export const get_user_timeleft = functions.https.onRequest((request, response) => {
        //useless part of the function...       
            querySnapshot.forEach(function (documentSnapshot) {
                //Here I know that documentSnapshot.data().registerTime 
                //returns whatever is saved in the database.
                //How can I return true or false if there's been 5 
                //or more days since the user registered?
                response.json(TRUE of FALSE);
            })
        }
    })
    .catch(function(error) {
        response.json(error);
    });

});

很明显，我可以再次调用admin.firestore.FieldValue.serverTimestamp()并尝试将它们相减，但是我什至不知道它的类型。过去，我曾经设法将Date用作Date，但由于Firebase认为distance将被弃用，因此我不知道如何处理它。

Answer 1

如果您想在Cloud Function中检查querySnapshot.forEach()循环返回的每个文档，如果距用户注册（即today - registerTime > 5）至少有5天，则可以执行如下：

export const get_user_timeleft = functions.https.onRequest((request, response) => {
            //useless part of the function...    

            const nowDate = new Date();

            querySnapshot.forEach(function (documentSnapshot) {
                //Here I know that documentSnapshot.data().registerTime 
                //returns whatever is saved in the database.
                //How can I return true or false if there's been 5 
                //or more days since the user registered?

                const elapsedTime = (nowDate.getTime() - documentSnapshot.data().registerTime.getTime());

                const daysDifference = Math.floor(elapsedTime/1000/60/60/24);

                //Check that the difference is more than 5 and then act accordingly
                //It is not crystal clear from your question if there is only one document in the querySnapshot


            })

    })
    .catch(function(error) {
        response.json(error);
    });

});

如果您确定知道查询仅返回一个文档（根据您所提问题的注释，情况似乎确实如此），您可以执行以下操作：< / p>

export const get_user_timeleft = functions.https.onRequest((request, response) => {
            //useless part of the function...    

            const nowDate = new Date();
            let daysDifference;

            querySnapshot.forEach(function (documentSnapshot) {
                //Here I know that documentSnapshot.data().registerTime 
                //returns whatever is saved in the database.
                //How can I return true or false if there's been 5 
                //or more days since the user registered?

                const elapsedTime = (nowDate.getTime() - documentSnapshot.data().registerTime.getTime());

                daysDifference = Math.floor(elapsedTime/1000/60/60/24);            

            });

            if (daysDifference > 5) {
                 response.send({ result: true }); 
            } else {
                 response.send({ result: false }); 
            }


    })
    .catch(function(error) {
        response.json(error);
    });

});

计算云函数中的时差

1 个答案: