mongoose 18

Schema supports plugins so you can extend some of the featuresThe following example is when document save is customized to update the last modified date of the pluginLastMod.jsmodule.exports = exports = function Lastmodifiedplugin (schema, options) { schema.add ({lastmod:date}) C2/>schema.pre (' Save ', function (next) { this.lastmod = new Date next () }) if (Options Options.index) { schema.path (' Lastmod '). Index (Options.index) }}//game-schema.jsvar lastmod = require ('./ Las

UpdateThere are several ways to update the document. Let's take a look at the traditional Update methodTank.findbyid (ID, function (err, Tank) { if (err) return HandleError (err); Tank.size = "large"; Tank.save (err) { if (err) return HandleError (err); Res.send (tank); });The above code is the first to find out a dociment and then in the update. What if we don't want to find dociment to update directly?Tank.update ({_id:id}, {$set: {size: ' Large '}}, callback

For example, my code database code can be divided into Chinese and English sites. Each table has a site_code field to distinguish, The two sites are deployed on different people servers. In this case, we will use system environment variables to differentiate them, Set the environment variables in Mac Vim ~ /. Bash_profile Add a line of code export site_code = 'cn' In UNIX, run the export site_code = 'cn' command on the terminal. Enter the following command once after setting in Mac to see

Recently, you need to implement an HTTP service function in your project. Although you can implement HTTP sending and parsing by encapsulating the socket itself. However, considering that the network still has a large number of HTTP parsing source code, their own to achieve a little bit of trouble from scratch. So on the network to a lot of, see many implementation of HTTP code, no one does not reflect its lightweight features. However, although lightweight, in terms of the amount of code, for a

Tags: model Mon option. com family uri Add tags div Model.find(query, fields, options, callback) Model.find({ ‘some.value‘: 5 }, function (err, docs) { // docs is an array }); Model.findoneModel.findOne({ age: 5}, function (err, doc){ // doc is a Document }); Model.findbyidModel.findById(obj._id, function (err, doc){ // doc is a Document }); Model.countModel.count(conditions, callback); Model.removeModel.remove(conditions, callback); Model.distinctModel.distinct(field, condition

Create a connection using the Mongoose.connect () methodMongoose.conect (' Mongodb://localhost/myapp ');The above code is linked to the MyApp database of MongoDB via the default port 27017. We can also set some specific parameters for the URL:Mongoose.conect (' Mongodb://username:[email protected]:p ort/databasename?options ... ');OptionsThe Connect method can accept an options objectMongoose.connect (URI, options);Here is the Options key DB-Set which database to connect to Server-S

' 1234567890 ' New mongostore url:config.db, ' sessions 'app.routeris the enhanced version of Connect router, which is used to process, and so on, the app.get app.post request processing settings, the corresponding function is called when the browser accesses the corresponding URL in these settings express.router . If it is not explicitly called, app.use(app.router) Express will be app.get(...) implicitly called when the first encounter such a setting, so this can no

If a document has a field of type string array, such as {id:1,tags:[' AA ', ' BB ', ' cc '}, now to change the ' BB ' of the tags field to ' bb ', the previous way is to write:Articlemodel.find ({tags:{$all: [Doc.name]}},function(err,articles) {Articles.foreach (function(article) { for(varj = 0;j){ if(Article.tags[j] = = =doc.name) {Article.tags[j]=Req.body.name; Article.markmodified (' Tags '); Article.save (); Break; }

Recently developed too busy, there is no time to update the blog, want to use this blog to summarize the relevant experience, in case the following can be used:First, Antd1.onChange of undefined problem: it is possible that the form in the page has the same name, or the parent element of the time-out form does not have a unique key set.Wait for update ...Second, ES6Wait for update ...Third, Mongoose1. When querying, if you encounter an association relationship that queries multiple tables, you c

Objective After watching the node.js actual combat, which in the data storage part of the Redis, Mongodb, I also wrote the book according to the introduction of a few simple demo, in the demo process first encountered the problem is the type of data and common curd writing. There are two ways to mongodb common operations, one is to use the API directly, and the same is that you use T-SQL to write SQL statements to manipulate the data, and then use the Mongo