如何配置StrongLoop LoopBack MongoDB数据源以部署到Heroku [英] How to configure StrongLoop LoopBack MongoDB datasource for deployment to Heroku
问题描述
我正在使用LoopBack版本。 1.6,并有一个本地mongoDB服务器,运行以下数据源配置进行开发:
mongodb:{
defaultForType:mongodb,
connector:loopback-connector-mongodb,
database:xxxdbname,
host:localhost,
port:27017
},
现在我想部署到Heroku但我不知道如何将数据源配置为指向MongoLab db,因为它有一个动态生成的连接字符串:
来自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){
});
});
});
那么需要对我的数据源JSON进行哪些更改以映射Heroku连接字符串?
这是LoopBack的一个TODO,用于支持从环境变量和其他来源配置数据源/模型。一个想法是使用模板引擎来加载datasources.json,以便它可以在运行时解析变量。
与您的问题相关,LoopBack允许您配置数据源使用'url'属性。例如:
{
connector:loopback-connector-mongodb,
url :mongodb:// localhost:27017 / mydb
}
作为解决方法,您可以为Heroku编写一个部署后脚本,以便用process.env.MONGOLAB_URI或process.env.MONGOHQ_URL替换url值。
sed -i.bak s / MONGODB_URL / $ MONGOHQ_URL / g datasources.json
同时,请在 https://github.com/strongloop/loopback/issues 上打开问题。
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 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.
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