Seeding

Question

我正在尝试对正在编写的NodeJS程序实施一种基于角色的访问控制。这些角色将与所有其他数据一起使用Mongoose存储在MongoDB数据库中。为此创建了RoleSchema。角色的名称类型为String，数组类型为String，其中包含角色权限。我已经在下面发布了该代码。

对于我的API，我要实现三个角色：用户，作者和管理员，每个角色具有不同的权限。在集合中一次创建这些文档的最佳方法是什么？我知道我可以简单地手动创建条目，但是我觉得编程解决方案会更好。就像检查角色是否已经创建，是否创建角色一样简单，还是有更好的方法呢？

const RoleSchema = new Schema({
    role: {
        type: String,
        default: "user",
    },
    permissions: {
        type: [String]
    }
})

const RoleModel = mongoose.model('roles',RoleSchema)
RoleModel.create({
    role: 'user',
    permissions: ['readPost', 'commentPost', 'votePost']
}, (error, result) => {})

Answer 1

Seeding

So, Seeding a database is a process in which an initial set of data is provided to a database.

As a best practice instead of manually inserting the data you should configure seed data for automatic insertion of documents.

var seeder = require('mongoose-seed');

// Connect to MongoDB via Mongoose
seeder.connect('mongodb://localhost/yourDatabase', function() {

// Load Mongoose models
seeder.loadModels([
    'models/roles.js'
]);

// Clear specified collections
seeder.clearModels(['roles'], function() {

// Callback to populate DB once collections have been cleared
seeder.populateModels(data, function() {
        seeder.disconnect();
     });

  });
});

// Data array containing seed data - documents organized by Model 
var data = [
   {
      'model': 'role',
      'documents': [
          {
              'role': 'user',
              'value': ['readPost', 'commentPost', 'votePost']
          },{
              'role': 'another role',
              'value': ['updatePost', 'deletePost']
          }
       ]
   }
];

put that code on a seed.js file and run it.

mongoose-seed library

Answer 2

Assuming that the role names are unique, you can indeed query the database and check if a role with the same name already exists. If not, we go ahead and create the role.

This works well for me:

const createRole = async ({role, permissions}) => {
    const matches = await RoleModel.find({role}).exec();

    if (matches.length === 0) {
        return RoleModel.create({role, permissions});
    }
};

The method can be then invoked in the following way (given that you've already connected to the database):

const userRole = {
    role: "User",
    permissions: ["readPost", "commentPost", "votePost"]
};

(async () => {
    await createRole(userRole);
    console.log("User role has been created successfully.");
})()

创建Mongoose / MongoDB常量文档

2 个答案:

Seeding