如何迭代mongodb数据库在node.js发送到Algolia

Question

在Algolia的文档中，对于node.js部分，他们指定使用MySQL进行索引，而不是MongoDB，我对这个问题有另一个问题，但这是一个更一般的问题，检查这里

有些人让我使用mongo-connector，但我尝试了它，我得到了一些未知的错误，这让我回到了第一步

我真正的问题是，我如何迭代mongodb的集合列表到algolia?

这是Algolia版本的MySQL在Node.js

var _ = require('lodash');
var async = require('async');
var mysql = require('mysql');
var algoliasearch = require('algoliasearch');
var client = algoliasearch("RQGLD4LOQI", "••••••••••••••••••••••••••••••••");
var index = client.initIndex('YourIndexName');
var connection = mysql.createConnection({
  host: 'localhost',
  user: 'mysql_user',
  password: 'mysql_password',
  database: 'YourDatabaseName'
});
connection.query('SELECT * FROM TABLE_TO_IMPORT', function(err, results, fields) {
  if (err) {
    throw err;
  }
  // let's use table IDS as Algolia objectIDs
  results = results.map(function(result) {
    result.objectID = result.id;
    return result;
  });
  // split our results into chunks of 5,000 objects, to get a good indexing/insert performance
  var chunkedResults = _.chunk(results, 5000);
  // for each chunk of 5,000 objects, save to algolia, in parallel. Call end() when finished
  // or if any save produces an error
  // https://github.com/caolan/async#eacharr-iterator-callback
  async.each(chunkedResults, index.saveObjects.bind(index), end);
});
function end(err) {
  if (err) {
    throw err;
  }
  console.log('MySQL<>Algolia import done')
};

具体来说，我使用mongoose作为我的ORM，所以我没有其他库的经验。请在这方面帮助我，这样我可以一些搜索界面已经:(.

Answer 1

您可以使用以下代码遍历整个MongoDB mydb.myCollection集合并创建将发送到Algolia索引的批:

var Db = require('mongodb').Db,
    Server = require('mongodb').Server,
    algoliasearch = require('algoliasearch');
// init Algolia index
var client = algoliasearch("*********", "••••••••••••••••••••••••••••••••");
var index = client.initIndex('YourIndexName');
// init connection to MongoDB
var db = new Db('mydb', new Server('localhost', 27017));
db.open(function(err, db) {
  // get the collection
  db.collection('myCollection', function(err, collection) {
    // iterate over the whole collection using a cursor
    var batch = [];
    collection.find().forEach(function(doc) {
      batch.push(doc);
      if (batch.length > 10000) {
        // send documents by batch of 10000 to Algolia
        index.addObjects(batch);
        batch = [];
      }
    });
    // last batch
    if (batch.length > 0) {
      index.addObjects(batch);
    }
  });
});