firebase数据库多个等于或嵌套等于

Question

我正在尝试通过检查电影是否具有相同的发行日期，相同的标题以及是否在记录到数据库之前是否属于同一类别，来检查该电影是否已在数据库中。我确定这样做是错误的，并且不知道如何对多个条件或嵌套的if进行检查。

for(var i = 0; i < moviesJSON.results.length; i++) {
    var movie = moviesJSON.results[i];

    // check for release date
    moviesDb.orderByChild('release_date').equalTo(movie.release_date).once('value', function(snapshot) {
        if(snapshot.exists()) {
            console.log('same release date');
            // if same release date, check for title
            moviesDb.orderByChild('title').equalTo(movie.title).once('value', function(snapshot) {
                if(snapshot.exists()) {
                    // if same release date and title, check for category
                    moviesDb.orderByChild('category').equalTo(optionCategory).once('value', function(snapshot) {
                        if(snapshot.exists()) {
                            // data already in database, do nothing
                            console.log('movie info already in database, do nothing!!!!');
                        } else {
                            // category is different, update database and change category
                            console.log('update category for title: ' + movie.title);
                        }
                    });
                } else {
                    // same release date, but different movie, add to database
                    console.log('same release date, but different title, add to database!!!');
                }
            });

非常感谢您的帮助。谢谢大家