变量未从异步功能更新/承诺未提供最终变量

Question

我在使数组工作时遇到麻烦，就像我在函数后执行console.log语句时那样，我得到一个空数组...我知道它与JS的异步特性有关，但是我可以不知道如何解决它。我尝试使用Promises，但是console.log语句中仍然出现空数组。同样，总变量即使应增加也保持等于0。

有任何提示/建议吗？谢谢。

这是我的代码：

let total = 0;
 let collections = [];
                    return Promise.all(courts.map(court => {
                      return new Promise((resolve, reject) => {
                        return Promise.all(court.users.map(async user => {
                          let tempPromise = new Promise((resolve, reject) => { 
                              setTimeout(() => {
                                  resolve();
                              }, 5000);
                          });
                                      return SignDetail.find({
                                        userName: user.userName,
                                        signStatus: "signIn",
                                      }).then(function(sign) { 
                                        if (user.userName.endsWith('zs')) { 
                                            let signCount = 0;
                                            if (sign.length > 1) {
                                                for (let j = 0; j < sign.length; j++) {
                                                    let courtObj = {courtName: sign[j].userName}; //make court object
                                                    signCount++; //increment each time there's a signature
                                                    if (j === sign.length - 1) { //only push object in array when all signatures have been counted
                                                        courtObj.signCount = signCount;
                                                        collections.push(courtObj);
                                                    } 
                                                }
                                            } 

                                        } //end here
                                      }); 
                          return tempPromise;
                        })).then(_ => resolve(collections));
                      })
                    })).then(collections => {
                      // HERE you will your collection and you can use this promise where this function is being called. 
                      console.log(collections);
                    });
    test() //call async function

    courts.forEach(court => { // count amount of signatures for only zs courts
        for (let i = 0; i < court.users.length; i++) {
              SignDetail.countDocuments({userName: court.users[i].userName}, 
            function(err, count) {
              if (count > 0) total = count;
                    });
                } 
              });

              console.log(total) // output should be greater than 0, but console outputs 0
              console.log(collections); //outputs []
  }