I'm using LoopBack ver. 1.6 and have a local mongoDB server running for development using he following datasource configuration:
"mongodb": {
"defaultForType": "mongodb",
"connector": "loopback-connector-mongodb",
"database": "xxxdbname",
"host": "localhost",
"port": "27017"
},
Now I want to deploy to Heroku but I don't know how to configure the datasource to point at the MongoLab db since it has a dynamically generated connection string:
from the Heroku dox:
var mongo = require('mongodb');
var mongoUri = process.env.MONGOLAB_URI ||
process.env.MONGOHQ_URL ||
'mongodb://localhost/mydb';
mongo.Db.connect(mongoUri, function (err, db) {
db.collection('mydocs', function(er, collection) {
collection.insert({'mykey': 'myvalue'}, {safe: true}, function(er,rs) {
});
});
});
So what kind of changes do I need to make to my datasource JSON to map the Heroku connection string?
This has now (as of June 27 2014) been addressed: create a file datasources.local.js
with the following content (where mongodb
is your data source name):
var mongoUri = process.env.MONGOLAB_URI ||
process.env.MONGOHQ_URL ||
'mongodb://localhost/mydb';
module.exports = {
mongodb: {
defaultForType: "mongodb",
connector: "loopback-connector-mongodb",
url: mongoUri
}
};
Note: datasources.json
is still required (can be empty) and the .js
overrides the configuration in the .json
file.
This is a TODO for LoopBack to support configuration of datasources/models from environment variables and other sources. One idea is to use a template engine to load datasources.json so that it can have variables to be resolved at runtime.
Related to your question, LoopBack allows you to configure the datasource using a 'url' property. For example:
{
"connector": "loopback-connector-mongodb",
"url": "mongodb://localhost:27017/mydb"
}
As a workaround, you can write a post-deployment script for Heroku to replace the url value with process.env.MONGOLAB_URI or process.env.MONGOHQ_URL.
sed -i.bak s/MONGODB_URL/$MONGOHQ_URL/g datasources.json
Meanwhile, please open an issue at https://github.com/strongloop/loopback/issues.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With