I am creating an app for employees using Meteor and MongoDB. This app will be used by multiple organizations. So I will make a separate DB for each organization. I am facing an issue in Meteor about how to keep database name and collection name as variable. Database name will be decided on login. Then I will keep DB name in Session.
Collection name can also be a variable.
For example:
var dbName = Session.get("dbName"); //for eg dbName="redex"
var collectionName = Session.get("collectionName"); // for ex collectionName="employees"
Employees = new Mongo.Collection(collectionName);
How to manage the variables in this case?
You will have to create a server method that creates a given database according to dbName and collectionName parameters:
'newDatabase': function (dbName, collectionName) {
var d = new MongoInternals.RemoteCollectionDriver(process.env.MONGO_URL.replace("originDB", dbName));
Employees = new Mongo.Collection(collectionName, { _driver: d });
}
You will also have to declare that new collection on your client side:
Meteor.call('newDatabase', Session.get("dbName"), Session.get("collectionName"), function (err, res) {
if (!err)
Employees = new Mongo.Collection(Session.get("collectionName"));
});
Related
I am new to Parse Server.
I am having an existing collection "users" in "employee" db in Mongodb.
I need to get the users data using Parse Server.
Below is the code:
var query = new Parse.Query(users);
query.find().then((data) => {
return data;
}).catch((error) => {
return error;
});
But I am getting the error "users" is not defined.
Need some valuable help.
if your Class really is called users (which is different to the built-in Parse Server Class called User), then use :
var query = new Parse.Query('users'); //note the quotation around 'users'
If you are in fact trying to query the built-in User class, use :
var query = new Parse.Query(Parse.User);
or
var query = new Parse.Query('_User');
I am getting db is not defined when trying to use mongodb's distinct in meteor.
Template.displayinbox.helpers({
inboxlistings: function() {
itemscount = db.Messages.distinct( "fromUsername" ).count;
return db.Messages.distinct( "fromUsername" );
}
});
I want to be able to return only distinct documents in my collection from the username field and count all those documents that is posted by the fromUsername. How would I go about doing this in Meteor?
When you're querying anything in the Meteor code itself, you don't need to write db first. You have to use the variable name that used to instantiate the Mongo Object. Let's say you defined your Mongo db like this.
example = new Mongo.Collection('Messages');
then within your helper you just use the typical query using this object.
Template.displayinbox.helpers({
inboxlistings: function() {
var items = example.find();
return _uniq(items,function(i){return i.fromUserName;});
}
});
I am trying to connect to MongoDB with Web Api, trying to return the connected data in MongoDB using Get. The name of the database is "test" and the collection name is "restaurant".
Here is the code I have
public IEnumerable<restaurants> Get()
{
var client = new MongoClient();
var dbs = client.GetDatabase("test");
var collection = dbs.GetCollection<restaurants>("restaurants");
return collection;
}
The last collection word is underlined, and I have not found what needs to be returned (in place of collection) in order to show the database in MongoDB (using postman).
I think you are trying to return IMongoCollection, not IEnumerable so last line is underlined :)
Try to transform collection to List (asynchronously), then return. For example:
public Task<List<restaurants>> GetRestaurantsAsync()
{
var client = new MongoClient();
var dbs = client.GetDatabase("test");
var collection = dbs.GetCollection<restaurants>("restaurants");
return await collection.Find(_ => true).ToListAsync();
}
public async Task MainAsync()
{
List<restaurants> restaurantsList = await GetRestaurantsAsync();
}
Note: it depends on which version of mongo c# driver you're using.
JS beginner trying to get a PostgreSQL DB talking to express.js through bookshelf.js.
github: https://github.com/duskyshelf/bookers-academy/blob/master/booker.js
var knex = require('knex')({
client: 'pg',
connection: "postgres://localhost/bookers"
});
var bookshelf = require('bookshelf')(knex);
var User = bookshelf.Model.extend({
tableName: 'users'
});
var bob = new User({id: 2});
bob.save()
bookshelf.js seems unable to add any content to the db.
Current error message is: "Unhandled rejection CustomError: No Rows Updated'
When you create your model providing your own id, like in
var bob = new User({id: 2});
Bookshelf assumes it is an update operation, not an insertion. It sets the internal isNew attribute to false, and when save() is invoked, instead of INSERT INTO user(id, ...) VALUES (2, ...);, it executes UPDATE user ... WHERE id = 2;.
If there is no user with id = 2 the update will almost silently DO NOTHING.
To force an insert you must change the save() to:
bob.save(null, {method: 'insert'});
Bookshelf save() documentation describes this behavior.
Did you create a User table using knex? One potential problem I can think of is that you do not have any logic that actually creates the table for your Postgres DB. Here is some sample code that will create a table in your database if it doesn't yet exist.
bookshelf.knex.schema.hasTable('User').then(function(exists) {
if(!exists) {
bookshelf.knex.schema.createTable('User'), function(user) {
user.increments('id').primary();
user.timestamps();
}).then(function(table){
console.log('Created Table:', table);
});
}
});
new User({id: 2}).
save().
then((model) => {
res.json({ success: true });
});
No no! new User returns a PROMISE! You can't use it like that.
Try
new User().save()
can you please help me,
I am trying to copy all collections in a particular database into create new database and move that collection into it.But the following code does not work. and my colleciton name in the db contains two part ' mg2.data' ,'mg32.data' i want to create new database mg2 and copy collection name as data.
collection name mg2.data suppose to be in mg2 database and collection name data.
db.getCollectionNames().forEach(function( a ){
if(a!='system.indexes' ) {
var sp = a.split('.');
var dbName = sp[0];
var col = sp[1];
//print(dbName)
db[a].copyTo(db.getSiblingDB(dbName).getcCollection(col));
}
});
Here is my situation details.
I am having Db name Master and it contains about 60-70 collections its names like(mg1.data,mg2.data,mg3.data)
and i want it to be like
db name mg1 and collection name data
db name mg2 and collection name data and so on..
i am facing the problem that when in the first design write operation locks entire database(Master). i cannot go for sharding and all now.
I got this approach working for me.I dont know is this best aproach
db.getCollectionNames().forEach(function( a ){
if(a!='system.indexes' ) {
var sp = a.split('.');
var dbName = sp[0];
var col = sp[1];
print(dbName+'\n');
//db[a].copyTo(db.getSiblingDB(dbName).getcCollection(col));
db[a].find().forEach(function(d){ db.getSiblingDB(dbName)[col].insert(d); });
}
});