mongodb

问题 I am building an App based on Node.js running on Heroku. The app uses a JSON file which at the moment is being pushed with the rest of the app, and we are reading and writing to it like so: var channelsList = require("./JSON/channels.json"); ... fs.writeFile("JSON/channels.json", JSON.stringify(channelsList), onCleaned); This has worked for now for the prototype, but I know that we need to use a data store or the changes won't persist when Dyno's sleep or I push changes. I have read that

问题 Using nodejs and imagemagick am able to re-size an image and send it to the browser with this. var http = require('http'), spawn = require('child_process').spawn; http.createServer(function(req, res) { var image = 'test.jpg'; var convert = spawn('convert', [image, '-resize', '100x100', '-']); convert.stdout.pipe(res); convert.stderr.pipe(process.stderr); }).listen(8080); The test image is read from the file-system, I want to alter so that test image is a binary string. var image = 'some long

问题 Using nodejs and imagemagick am able to re-size an image and send it to the browser with this. var http = require('http'), spawn = require('child_process').spawn; http.createServer(function(req, res) { var image = 'test.jpg'; var convert = spawn('convert', [image, '-resize', '100x100', '-']); convert.stdout.pipe(res); convert.stderr.pipe(process.stderr); }).listen(8080); The test image is read from the file-system, I want to alter so that test image is a binary string. var image = 'some long

问题 So I have a field called 'city' in my results...the results are corrupted, some times it's an actual name, sometimes it's a number. The following code displays all the records... db.zips.aggregate([{$project : {city:{$substr:["$city",0,1]}}},{$sort : {city : 1}} ]) I need to modify this line to display only the records with a city who has a name that is a number (2,3,4, etc)....I think I can use '$match', but how? db.zips.aggregate([{$project : {city:{$substr:["$city",0,1]}}},{$sort : {city :

问题 So I have a field called 'city' in my results...the results are corrupted, some times it's an actual name, sometimes it's a number. The following code displays all the records... db.zips.aggregate([{$project : {city:{$substr:["$city",0,1]}}},{$sort : {city : 1}} ]) I need to modify this line to display only the records with a city who has a name that is a number (2,3,4, etc)....I think I can use '$match', but how? db.zips.aggregate([{$project : {city:{$substr:["$city",0,1]}}},{$sort : {city :

问题 So I have a field called 'city' in my results...the results are corrupted, some times it's an actual name, sometimes it's a number. The following code displays all the records... db.zips.aggregate([{$project : {city:{$substr:["$city",0,1]}}},{$sort : {city : 1}} ]) I need to modify this line to display only the records with a city who has a name that is a number (2,3,4, etc)....I think I can use '$match', but how? db.zips.aggregate([{$project : {city:{$substr:["$city",0,1]}}},{$sort : {city :

问题 So I have a field called 'city' in my results...the results are corrupted, some times it's an actual name, sometimes it's a number. The following code displays all the records... db.zips.aggregate([{$project : {city:{$substr:["$city",0,1]}}},{$sort : {city : 1}} ]) I need to modify this line to display only the records with a city who has a name that is a number (2,3,4, etc)....I think I can use '$match', but how? db.zips.aggregate([{$project : {city:{$substr:["$city",0,1]}}},{$sort : {city :

问题 So I have a field called 'city' in my results...the results are corrupted, some times it's an actual name, sometimes it's a number. The following code displays all the records... db.zips.aggregate([{$project : {city:{$substr:["$city",0,1]}}},{$sort : {city : 1}} ]) I need to modify this line to display only the records with a city who has a name that is a number (2,3,4, etc)....I think I can use '$match', but how? db.zips.aggregate([{$project : {city:{$substr:["$city",0,1]}}},{$sort : {city :

问题 I'm using Node.js + Express + Passport to create a simple authentication(local) and what I've reached so far that when a wrong username or password entered user is redirected to an error page but when the user enters a correct username and password I get this error node_modules\mongoose\lib\utils.js:435 throw err; ^ TypeError: Object { _id: 50b347decfd61ab9e9e6768f, username: 'saleh', password: '123456' } has no method 'validPassword' I'm not sure what's wrong there app.js (I removed the

问题 I'm using Node.js + Express + Passport to create a simple authentication(local) and what I've reached so far that when a wrong username or password entered user is redirected to an error page but when the user enters a correct username and password I get this error node_modules\mongoose\lib\utils.js:435 throw err; ^ TypeError: Object { _id: 50b347decfd61ab9e9e6768f, username: 'saleh', password: '123456' } has no method 'validPassword' I'm not sure what's wrong there app.js (I removed the