Question

这是我想要完成的事情：我有2个数据表 - 诗歌和搜索。每次用户将新记录保存到Poems表中时，我想检查它是否与已在搜索表中输入的任何搜索匹配。搜索数据表每个记录有3个字段：searchWordOne，searchWordTwo和searchWordThree。因此，每次在Poems表中创建一个新条目时，我想检查该条目的内容字段（这是一个字符串）是否包含searchWordOne，searchWordTwo或searchWordThree，用于搜索数据表中的任何记录。当匹配时，我想将相应的Searches表记录的objectId添加到Array。我该怎么做呢？这是我的尝试：

Parse.Cloud.afterSave("Poems", function(request) {
  var searches = Parse.Object.extend("Searches");
  var query = new Parse.Query(searches);
  query.find({
    success: function(results) {
      for (var i = 0; i < results.length; i++) {
        var object = results[i];
        var keywordOne = object.get('searchWordOne');
        var keywordTwo = object.get('searchWordTwo');
        var keywordThree = object.get('searchWordThree');

    // I don't know how to get the content field of the object that has just
    // been saved in the Poems data table. 

      }
    },
    error: function(error) {
      alert("Error: " + error.code + " " + error.message);
    }
  });


});

Answer 1

让我们从匹配搜索的更严峻问题开始......

function searchesMatching(aPoem) {
    var content = aPoem.get("content");
    var words = content.split(" ");
    var query1 = new Parse.Query("Searches");
    query1.containedIn("searchWordOne", words);
    var query2 = new Parse.Query("Searches");
    query2.containedIn("searchWordTwo", words);
    var query3 = new Parse.Query("Searches");
    query3.containedIn("searchWordThree", words);
    return Parse.Query.or(query1, query2, query3).find();
}

对于与保存的诗歌相匹配的搜索，OP有点不清楚。如果你想改变那首诗（比如通过添加匹配的搜索），那么你应该使用beforeSave。这样，保存的诗歌的变化也会得到保存......

_ = require("underscore");

Parse.Cloud.beforeSave("Poems", function(request, response) {
    var aPoem = request.object;  // see below
    searchesMatching(aPoem).then(function(searches) {
        var ids = _.map(searches, function(search) { return search.id; });
        // I don't know the name of poem col that keeps the ids array
        // not even sure you have one... just guessing from the question
        // this would be easier if poems had an array of pointers rather than an array of ids, anyway...
        aPoem.set("poemArrayOfSearchIds" ids);  // change the attribute name to the real name
    }).then(function() {
        response.success();
    }, function(error) {
        response.error(error);
    });
});

我认为问题的一部分与如何获取被保存的诗有关。第一行解释了这一点：request.object是要保存的对象。

解析云代码AfterSave获取保存对象

1 个答案: