[英]How to get Loopback 3 conditional 'datasources' and 'model-config': following instructions and doesn't work
編輯:如果我認為“本地”變體只能覆蓋已經定義的結構,我能夠讓它在中途工作。 也就是說,我需要定義數據源“DynamoDB”和“蒙戈” datasources.json
並覆蓋它們datasources.local.js
。 然而,這不是我們想要做的——當我們部署到 AWS 時,我們不想讓 MongoDB 以任何方式參與進來。 非常感謝任何幫助!
我們需要配置取決於節點環回的數據源和模型配置env
變量。 具體來說,我們需要在 MongoDB 作為我們的本地開發數據庫和部署時的 DynamoDB 之間切換。 我按照這里的說明進行操作,其中說
顯然,根據這篇文章,我認為必須擁有“常規” datasources.json
和model-config.json
,而其他文件只能添加到那里定義的內容中。
無論如何,我添加了datasources.local.js
和model-config.local.js
但我仍然收到錯誤消息。 .env
文件中的環境變量LOOPBACK_ENV
設置正確(在本例中為“mongo”)
AssertionError [ERR_ASSERTION]: Event is referencing a dataSource that does not exist: "mongo"
at configureModel (/Users/abc/Documents/projects/abc-adj-new/node_modules/loopback/lib/application.js:584:5)
at Function.app.model (/Users/abc/Documents/projects/abc-adj-new/node_modules/loopback/lib/application.js:126:5)
at /Users/abc/Documents/projects/abc-adj-new/node_modules/loopback-boot/lib/executor.js:203:9
at Array.forEach (<anonymous>)
at setupModels (/Users/abc/Documents/projects/chatbot-adj-new/node_modules/loopback-boot/lib/executor.js:199:23)
at execute (/Users/abc/Documents/projects/abc-adj-new/node_modules/loopback-boot/lib/executor.js:40:3)
at bootLoopBackApp (/Users/abc/Documents/projects/abc-adj-new/node_modules/loopback-boot/index.js:154:3)
at Object.<anonymous> (/Users/abc/Documents/projects/abc-adj-new/server/server.js:79:1)
at Module._compile (internal/modules/cjs/loader.js:956:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:973:10)
at Module.load (internal/modules/cjs/loader.js:812:32)
at Function.Module._load (internal/modules/cjs/loader.js:724:14)
at Function.Module.runMain (internal/modules/cjs/loader.js:1025:10)
at internal/main/run_main_module.js:17:11 {
generatedMessage: false,
code: 'ERR_ASSERTION',
actual: false,
expected: true,
operator: '=='
}
我將添加下面的文件。 這是環回 3,節點 12.13。 非常感謝任何幫助!
// server/datasources.json
{
"db": {
"name": "db",
"connector": "memory"
},
"emailDataSource": {
"name": "emailDataSource",
"connector": "mail",
"transports": [
{
"type": "smtp",
"host": "smtp-service",
"secure": false,
"port": 25,
"tls": {
"rejectUnauthorized": false
}
}
]
}
}
// server/datasources.local.js
if (process.env.LOOPBACK_ENV === "mongo") {
module.exports = {
"dynamodb": {
"name": "dynamodb",
"connector": "dynamodb",
"region": "ap-northeast-1",
"credentials": "shared",
"profile": "iamrole"
}
};
} else {
module.exports = {
"mongo": {
"url": "${MONGO_URL}",
"name": "mongo",
"connector": "mongodb",
"allowExtendedOperators": true,
"useNewUrlParser": true
}
};
}
// server/model-config.json
{
"_meta": {
"sources": [
"loopback/common/models",
"loopback/server/models",
"../common/models",
"./models",
"../node_modules/bot-analytics/models"
],
"mixins": [
"loopback/common/mixins",
"loopback/server/mixins",
"../common/mixins",
"./mixins",
"../node_modules/amf-lb-expose-remote-methods-mixin/lib"
]
},
"Variable": {
"dataSource": "db",
"public": true
}
}
// server/model-config.js
if (process.env.LOOPBACK_ENV === "mongo") {
module.exports ={
"Event": {
"dataSource": "mongo",
"public": true
},
"History": {
"dataSource": "mongo",
"public": true
},
"Email": {
"dataSource": "mongo"
},
"FileUpload": {
"dataSource": "mongo",
"public": true
} ,
"ADJUser" : {
"dataSource": "mongo"
}
}
} else {
module.exports = {
"Event": {
"dataSource": "dynamodb",
"public": true
},
"History": {
"dataSource": "dynamodb",
"public": true
},
"Email": {
"dataSource": "dynamodb"
},
"FileUpload": {
"dataSource": "dynamodb",
"public": true
} ,
"ADJUser" : {
"dataSource": "dynamodb"
}
}
}
好吧,我不確定我是否會正確回答您的問題 - 但這是我在項目中通常會做的事情:
我在server
文件夾中有許多文件,具體取決於配置,根據加載的配置服務於不同的目的。 通常喜歡:
/server/middleware.json (for localhost)
/server/middleware.staging.json
/server/middleware.production.json
/server/datasources.json (for localhost)
/server/datasources.staging.json
/server/datasources.production.json
... 等等每個環境和文件。
然后,根據環境,我使用特定命令啟動應用程序:
NODE_ENV=production npm start server/server.js
NODE_ENV
屬性將告訴應用程序要讀取哪個配置文件。 如果你不提供任何,第一個文件將被讀取(在我的例子中/server/middleware.json
和/server/datasources.json
)
希望這可以幫助!
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