Using custom Loopback user model with loopback-component-passport

You will have to extend all passport related models, so you can have them linked to your custom user model.

user.json

{  "name": "user",  "plural": "users",  "base": "User",  "relations": {    "accessTokens": {      "type": "hasMany",      "model": "accessToken",      "foreignKey": "userId"    },    "identities": {      "type": "hasMany",      "model": "userIdentity",      "foreignKey": "userId"    },    "credentials": {      "type": "hasMany",      "model": "userCredential",      "foreignKey": "userId"    }  },  "validations": [],  "acls": [],  "methods": []}

user-identity.json

{  "name": "userIdentity",  "plural": "userIdentities",  "base": "UserIdentity",  "properties": {},  "validations": [],  "relations": {    "user": {      "type": "belongsTo",      "model": "user",      "foreignKey": "userId"    }  },  "acls": [],  "methods": []}

user-credential.json

{  "name": "userCredential",  "plural": "userCredentials",  "base": "UserCredential",  "properties": {},  "validations": [],  "relations": {    "user": {      "type": "belongsTo",      "model": "user",      "foreignKey": "userId"    }  },  "acls": [],  "methods": []}

access-token.json

{  "name": "accessToken",  "plural": "accessTokens",  "base": "AccessToken",  "properties": {},  "validations": [],  "relations": {    "user": {      "type": "belongsTo",      "model": "user",      "foreignKey": "userId"    }  },  "acls": [],  "methods": {}}

server.js (relevant part)

const PassportConfigurator = require('loopback-component-passport').PassportConfiguratorconst passportConfigurator = new PassportConfigurator(app)let providersConfig = require('./providers.json')passportConfigurator.init()passportConfigurator.setupModels({  userModel: app.models.user,  userIdentityModel: app.models.userIdentity,  userCredentialModel: app.models.userCredential})for (let s in providersConfig) { // Configure providers based on providers.json config  let c = providersConfig[s]  c.session = c.session !== false  passportConfigurator.configureProvider(s, c)}

There is also an example repository, which might be useful for you.