I'm very keen to utilize Meteor as the framework for my next project. However, there is a requirement to keep customer data separated into different MongoDB instances for users from different customers.
I have read on this thread that it could be as simple as using this:
var d = new MongoInternals.RemoteCollectionDriver("<mongo url>");
C = new Mongo.Collection("<collection name>", { _driver: d });
However, I was dished this error on my server/server.js. I'm using meteor 0.9.2.2
with meteor-platform 1.1.0.
Exception from sub Ep9DL57K7F2H2hTBz Error: A method named '/documents/insert' is already defined
at packages/ddp/livedata_server.js:1439
at Function._.each._.forEach (packages/underscore/underscore.js:113)
at _.extend.methods (packages/ddp/livedata_server.js:1437)
at Mongo.Collection._defineMutationMethods (packages/mongo/collection.js:888)
at new Mongo.Collection (packages/mongo/collection.js:208)
at Function.Documents.getCollectionByMongoUrl (app/server/models/documents.js:9:30)
at null._handler (app/server/server.js:12:20)
at maybeAuditArgumentChecks (packages/ddp/livedata_server.js:1594)
at _.extend._runHandler (packages/ddp/livedata_server.js:943)
at packages/ddp/livedata_server.js:737
Can anyone be so kind as to enlighten me whether or not I have made a mistake somewhere?
Thanks.
Br,
Ethan
Edit: This is my server.js
Meteor.publish('userDocuments', function () {
// Get company data store's mongo URL here. Simulate by matching domain of user's email.
var user = Meteor.users.findOne({ _id: this.userId });
if (!user || !user.emails) return;
var email = user.emails[0].address;
var mongoUrl = (email.indexOf('#gmail.com') >= 0) ?
'mongodb://localhost:3001/company-a-db' :
'mongodb://localhost:3001/company-b-db';
// Return documents
return Documents.getCollectionByMongoUrl(mongoUrl).find();
});
and this is the server side model.js
Documents = function () { };
var documentCollections = { };
Documents.getCollectionByMongoUrl = function (url) {
if (!(url in documentCollections)) {
var driver = new MongoInternals.RemoteCollectionDriver(url);
documentCollections[url] = new Meteor.Collection("documents", { _driver: driver });
}
return documentCollections[url];
};
Observation: The first attempt to new a Meteor.Collection works fine. I can continue to use that collection multiple times. But when I log out and login as another user from another company (in this example by using an email that is not from #gmail.com), the error above is thrown.
Downloaded meteor's source codes and peeked into mongo package. There is a way to hack around having to declare different collection names on the mongodb server based on Hubert's suggestion.
In the server side model.js, I've made these adaptation:
Documents.getCollectionByMongoUrl = function (userId, url) {
if (!(userId in documentCollections)) {
var driver = new MongoInternals.RemoteCollectionDriver(url);
documentCollections[userId] = new Meteor.Collection("documents" + userId, { _driver: driver });
documentCollections[userId]._connection = driver.open("documents", documentCollections[userId]._connection);
}
return documentCollections[userId];
};
Super hack job here. Be careful when using this!!!!
I believe Meteor distinguish its collections internally by the name you pass to them as the first argument, so when you create the "documents" collection the second time, it tries to override the structure. Hence the error when trying to create the /documents/insert method the second time.
To work around this, you could apply a suffix to your collection name. So instead of:
new Meteor.Collection('documents', { _driver: driver });
you should try:
new Meteor.Collection('documents_' + userId, { _driver: driver })
Related
I've setup a simple "product" model (ie {id:"string","name":string, etc}) and setup a datasource using the REST connector to a remote URL that returns a JSON blob containing dozens of fields, how do I go about mapping the fields from the remote response to my local model? Whenever I execute my method I'm getting back the raw response from the remote....I was expecting, at a minimum, to get back an empty version of my model.
I'm pretty sure you will have to override the find() method on your model and perform this mapping work manually.
Something like this:
module.exports = function(app) {
var Product = app.models.Product;
var find = Product.find;
Product.find = function(filter, cb) {
// invoke the default method
find.call(Product, function(err, original_results) {
var results = {}; // a placeholder for your expected results
results.name = original_results.id;
results.name = original_results.name;
results.description = original_results.long_description;
// and so on
cb(null, results)
});
}
}
i'm working on a Meteor project, and I must say that isn't easy at all, especially for one thing: callbacks !
Everything is async, so I wonder how do I must do to get results from my mongodb.
var user = Meteor.users.findOne({username: "john"});
return (user); // sometimes returns "undefined"
...
var user = Meteor.users.findOne({username: "john"});
if (user) // so ok, I check if it exists!
return (user); // Cool, I got my user!
return (); // Ok and what should I return here? I want my user!
I don't want to be dirty and put like setTimeout everywhere.
Anybody has a solution for this ?
EDIT :
I noticed in router.js with console.log that my data is returned 4 times. 2 times with an undefined value and 2 other times with the expected value. In the view, it's still undefined.
Why the router passes like 4 times in this route ? Does it display the first result of the return value in the router ?
What should I return if the find() doesn't find anything ?
EDIT 2: Here is some code to understand.
this.route('profilePage', {
path: 'profil/:_id?',
waitOn: function() {
return [
Meteor.subscribe('article', { prop: this.params._id}), // id can be id or username
Meteor.subscribe('article', { userId: this.params._id}), // id can be id or username
Meteor.subscribe('params'),
Meteor.subscribe('profil', (this.params._id ? this.params._id : Meteor.userId()))
];
},
data: function() {
if (this.params._id) {
var user = Meteor.users.findOne(this.params._id);
if (!user)
user = Meteor.users.findOne({username: this.params._id});
console.log(user);
return user;
}
else if (Meteor.userId())
return Meteor.user();
else
Router.go("userCreate");
}
});
I get this on the console:
http://puu.sh/debdJ/69419911f7.png
(text version following)
undefined
undefined
Object_id: "o3mgLcechYTtHPELh"addresses: (....)
Object_id: "o3mgLcechYTtHPELh"addresses: (....)
findOne(yourId) is a sync method which is equivalent to find({ _id: yourId}, callback). The difference is that find() allows you to define a callback. If you don't pass a callback to find() this method will be sync.
check wrapAsync: http://docs.meteor.com/#/full/meteor_wrapasync
It allows you to code in a sync style with a async operations.
Free lesson on EventedMind: https://www.eventedmind.com/feed/meteor-meteor-wrapasync
My experience thus far is that the Meteor Mongodb package is that the functions do not generally provide callbacks (for some reason insert does...), the functions are atomic (thus sync).
There are meteor packages that can make Mongodb async if you want (I havn't tried any).
I guess this sync approach is in line with the simple maintenance goal of Mongodb. Thinking about it, one of my pet peeves using Node is working with async callback waterfalls/nests, they are a pain to create and maintain... and hopefully this will make my code easier to read and understand and change...
var future = new Future();
var _h = Hunts.findOne({huntId});
if(_h) {
future.return(_h)
} else {
return future.wait();
}
on server/startup.js you need:
Future = Npm.require('fibers/future');
Working on CoinsManager, I have a model directory with a class per file, and I want to read and list all those files in my collection transform method, to initialize my doc with the correct class.
server/methods.coffee:
Meteor.methods
implemented_coins: ->
"""
Returns a list of coins that have been implemented
"""
files = fs.readdirSync './app/models/cryptos/'
file.replace(".coffee.js", "") for file in files.filter (file) ->
file.search("(base_crypto*)|(js.map)") == -1
collections/addresses.coffee:
if Meteor.isReady
#implementedCoins = Meteor.call "implemented_coins"
#Addresses = new Meteor.Collection "addresses",
transform: (doc) ->
# Retrieve class from code, and pass it the address
if doc.code in #implementedCoins
new #[doc.code] doc.address
else doc
client/views/addresses/addresses_list.coffee
Template.userAddresses.helpers
userAddresses: ->
addresses = Addresses.find
userId: Meteor.user()._id
address.set_balance() for address in addresses
return addresses
Right now, I'm getting the following error on the client console:
Exception from Deps recompute: TypeError: Array.prototype.indexOf called on null or undefined
at indexOf (native)
at Addresses.Meteor.Collection.transform
Which means that in my collection transform, the #implementedCoins variable is undefined, because I didn't implement it correctly.
Any idea how to solve this problem ?
I'm pretty sure that this is wrong:
if Meteor.isReady
#implementedCoins = Meteor.call "implemented_coins"
I don't think there is a field in Meteor with that name, and even if it was, then it would get executed on startup, but at that time isReady is probably false and so your variable doesn't get set. Did you mean Meteor.startup? Secondly, on the client you need to use a callback for call, since there are no fibers on the client.
Would this work instead?
Meteor.startup(function () {
Meteor.call("implemented_coins", function(err, res) {
implementedCoins = res;
});
});
I kept having this error when i deploy my app onto meteor cloud server.
Meteor code must always run within a Fiber
at _.extend.get (app/packages/meteor/dynamics_nodejs.js:14:13)
at _.extend.apply (app/packages/livedata/livedata_server.js:1268:57)
at _.extend.call (app/packages/livedata/livedata_server.js:1229:17)
at Meteor.startup.Meteor.methods.streamTwit (app/server/server.js:50:24)
however, I have already wrapped within Fibers
streamTwit: function (twit){
var userid = '1527228696';
twit.stream(
'statuses/filter',
{ follow: userid},
function(stream) {
stream.on('data', function(tweet) {
Fiber(function(){
if(tweet.user.id_str === userid)
{
Meteor.call('addQn', tweet);
}
}).run();
console.log(tweet);
console.log('---------------------------------------------------------');
console.log(tweet.user.screen_name);
console.log(tweet.user.name);
console.log(tweet.text);
});
}
);
}
I don't know what's the reason but someone suggested that i should wrap it with Meteor.bindEnvironment instead. Hence, I did this:
streamTwit: function (twit){
this.unblock(); // this doesn't seem to work
console.log('... ... trackTweets');
var _this = this;
var userid = '1527228696';
twit.stream(
'statuses/filter',
{ follow: userid},
function(stream) {
stream.on('data', function(tweet) {
Meteor.bindEnvironment(function () {
if(tweet.user.id_str === userid)
{
Meteor.call('addQn', tweet);
}
}, function(e) {
Meteor._debug("Exception from connection close callback:", e);
});
console.log(tweet);
console.log('---------------------------------------------------------');
console.log(tweet.user.screen_name);
console.log(tweet.user.name);
console.log(tweet.text);
});
}
);
}
//add question method
addQn:function(tweet){
questionDB.insert({'tweet': tweet, 'date': new Date()});
}
but now it doesn't even work. I realise that this only happened when I tried to insert some data into mongodb.
May I know what is the problem with my code? Thanks!
All these codes were written in app/server/server.js
You shouldn't need to use Meteor.call on the server side. That is for client-side code only. Just call addQn directly or better yet, inline it since it's just one line of code.
I'm scratching my head here, as usual it seems with node projects, and I'm not sure if I'm doing something wrong or if I've run into a bug.
I've got a schema of Server that can have any number of embedded docs called services. I'm running into a problem though where, even though I've successfully removed the individual service from the server object, when I tell it to save it doesn't remove it from the database. The save function is working because it's saving any changes I've made and is also pushing in new embedded docs, it's just not removing one that are already there.
Here is a relatively simplified example of my code:
app.put('/server/:id', function(req, res, next){
app.Server.findOne({_id: req.params.id}, function(err, server) {
server.updated = new Date();
...
for (var num = _.size(req.body.server.services) - 1; num >= 0; num--){
// Is this a new service or an existing one
if (server.services[num]) {
// Is it marked for deletion? If so, delete it
if (req.body.server.services[num].delete == "true") {
server.services[num].remove()
} else { // else, update it
server.services[num].type = req.body.server.services[num].type
...
}
} else {
// It's new, add it
delete req.body.server.services[num]["delete"]
server.services.push(req.body.server.services[num]);
}
}
server.save(function(err){
if (!err) {
req.flash('success', 'Server updated')
} else {
req.flash('error', 'Err, Something broke when we tried to save your server. Sorry!')
console.log(err)
}
res.redirect('/')
});
})
});
So the remove() is actually removing the service. If I do a server.toObject() before the save, it's not there. Any ideas why it wouldn't be removing it from the database when it saves?
Edit: I suppose the version numbers would be helpful. node#0.4.2, mongoose#1.1.5 express#2.0.0rc
I could be wrong, since I've not tested your example, but this sounds like Mongoose isn't detecting that the embedded document is modified.
From the schema types documentation page:
Since it is a schema-less type, you can change the value to anything else you like, but Mongoose loses the ability to auto detect/save those changes. To "tell" Mongoose that the value of a Mixed type has changed, call the .markModified(path) method of the document passing the path to the Mixed type you just changed.
person.anything = { x: [3, 4, { y: "changed" }] };
person.markModified('anything');
person.save(); // anything will now get saved
So you answer might be as simple as using the markModified() function.
I found a way to temporary fix this problem.
What I did is load the embedded documents into an array, splice the one to be deleted and replace the array. Something like this:
var oldusers = dl.users;
oldusers.splice(dl.users.indexOf(req.currentUser.id), 1);
dl.users = oldusers;
dl.save(function(err) {...
I know that depending on the size of the document it will