ValidationError: The `user` instance is not valid. Details: `email` is invalid (value: "") about loopback-example-access-control

[osamasaeed]

I have resolved it. assign null to unnecessary fields
"credentials":null,
"challenges":null,
"realm":null,
"status": null,
"created": null,
"lastUpdated": null

in your model. if your base:"User"

[tniezurawski]

@liudonghua123 I didn't clone this repo but I'm pretty sure what's going on ;)

Leave db datasource as it was. Set server/datasources.json this way:

{
  "db": {
    "name": "db",
    "connector": "memory"
  },
  "mysqlDs": {
    "host": "localhost",
    "port": 3306,
    "database": "",
    "username": "",
    "password": "",
    "name": "mysqlDs",
    "connector": "mysql"
  }
}

Yours server/model-config.json should look somehow similar to this:

{
  "_meta": {
    "sources": [
      "loopback/common/models",
      "loopback/server/models",
      "../common/models",
      "./models"
    ],
    "mixins": [
      "loopback/common/mixins",
      "loopback/server/mixins",
      "../common/mixins",
      "./mixins"
    ]
  },
  "User": {
    "dataSource": "db"
  },
  "AccessToken": {
    "dataSource": "db",
    "public": false
  },
  "ACL": {
    "dataSource": "db",
    "public": false
  },
  "RoleMapping": {
    "dataSource": "db",
    "public": false,
    "options": {
      "strictObjectIDCoercion": true
    }
  },
  "Role": {
    "dataSource": "db",
    "public": false
  },
  "user": {
    "dataSource": "mysqlDs",
    "public": true
  }
}

Then the part that is the most important here. Most probably there is no tables in DB yet. Wrap all your code in server/boot/create-sample-models.js in automigrate like this:

module.exports = function(app) {
  app.dataSources.mysqlDs.automigrate('user', function(err) {
    // code here
  });
};

It should work. Tell me if doesn't so I will reproduce it.

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