tachybase_todo/docs/en-US/api/database/repository.md

Repository

Overview

On a given Collection object, you can get its Repository object to perform read and write operations on the data table.

const { UserCollection } = require("./collections");

const UserRepository = UserCollection.repository;

const user = await UserRepository.findOne({
  filter: {
    id: 1
  },
});

user.name = "new name";
await user.save();

Query

Basic Query

On the Repository object, call the find* methods to perform query. The filter parameter is supported by all query methods to filter the data.

// SELECT * FROM users WHERE id = 1 
userRepository.find({
  filter: {
      id: 1
  }
});

Operator

The filter parameter in the Repository also provides a variety of operators to perform more diverse queries.

// SELECT * FROM users WHERE age > 18
userRepository.find({
  filter: {
    age: {
      $gt: 18
    }
  }
});

// SELECT * FROM users WHERE age > 18 OR name LIKE '%张%'
userRepository.find({
  filter: {
    $or: [
      { age: { $gt: 18 } },
      { name: { $like: "%张%" } }
    ]
  }
});

Refer to Filter Operators for more details on operators.

Field Control

Control the output fields by the fields, except, and appends parameters when performing query.

• fields: Specify output fields
• except: Exclude output fields
• appends: Append output associated fields

// The result contains only the <i>id</i> and <i>name</i> fields
userRepository.find({
  fields: ["id", "name"],
});

// The result does not contain only the <i>password</i> field
userRepository.find({
  except: ["password"],
});

// The result contains data associated with the <i>posts</i> object
userRepository.find({
  appends: ["posts"],
});

Associated Field Query

The filter parameter supports filtering by associated fields, for example:

// Find the <i>user</i> objects whose associated posts have title of "post title"
userRepository.find({
  filter: {
      "posts.title": "post title"
  }
});

Associated fields can also be nested:

// Find the <i>user</i> objects whose associated posts have comments containing "keywords"
await userRepository.find({
  filter: {
    "posts.comments.content": {
      $like: "%keywords%"
    }
  }
});

Sort

Sort query results by the sort parameter.

// SELECT * FROM users ORDER BY age
await userRepository.find({
  sort: 'age'
});


// SELECT * FROM users ORDER BY age DESC
await userRepository.find({
  sort: '-age'
});

// SELECT * FROM users ORDER BY age DESC, name ASC
await userRepository.find({
  sort: ['-age', "name"],
});

Sort by the field of the associated object is also supported:

await userRepository.find({
  sort: 'profile.createdAt'
});

Create

Basic Create

Create new data objects via Repository.

await userRepository.create({
  name: "Mark",
  age: 18,
});
// INSERT INTO users (name, age) VALUES ('Mark', 18)


// Bulk creation
await userRepository.create([
  {
    name: "Mark",
    age: 18,
  },
  {
    name: "Alex",
    age: 20,
  },
])

Create Association

Create associated objects at the same time of creating data. Similar to query, nested use of associated objects is also supported. For example:

await userRepository.create({
  name: "张三",
  age: 18,
  posts: [
    {
      title: "post title",
      content: "post content",
      tags: [
        {
          name: "tag1",
        },
        {
          name: "tag2",
        },
      ],
    },
  ],
});
// When crearing a user, creat a post to associate with the user, and create tags to associate with the post

If the associated object is already in the database, you can pass its ID to create an association with it.

const tag1 = await tagRepository.findOne({
  filter: {
    name: "tag1"
  },
});

await userRepository.create({
  name: "Mark",
  age: 18,
  posts: [
    {
      title: "post title",
      content: "post content",
      tags: [
        {
          id: tag1.id,  // Create an association with an existing associated object
        },
        {
          name: "tag2",
        },
      ],
    },
  ],
});

Update

Basic Update

After getting the data object, you can modify the properties directly on the data object (Model), and then call the save method to save the changes.

const user = await userRepository.findOne({
  filter: {
    name: "Mark",
  },
});


user.age = 20;
await user.save();

The data object Model is inherited from Sequelize Model, refer to Sequelize Model for the operations on Model.

Or update data via Repository:

// Update the records that meet the filtering condition
await userRepository.update({
  filter: {
    name: "Mark",
  },
  values: {
    age: 20,
  },
});

Control which fields to update by the whitelist and blacklist parameters, for example:

await userRepository.update({
  filter: {
    name: "Mark",
  },
  values: {
    age: 20,
    name: "Alex",
  },
  whitelist: ["age"], // Only update the <i>age</i> field
});

Update Associated Field

Associated objects can be set while updating, for example:

const tag1 = tagRepository.findOne({
  filter: {
    id: 1
  },
});

await postRepository.update({
  filter: {
    id: 1
  },
  values: {
    title: "new post title",
    tags: [
      {
        id: tag1.id // Associate with tag1
      },
      {
        name: "tag2", // Create new tag and associate with it
      },
    ],
  },
});


await postRepository.update({
  filter: {
    id: 1
  },
  values: {
    tags: null // Disassociate post from tags
  },
})

Delete

Call the destroy() method in Repository to perform the deletion operation. Filtering condition has to be specified to delete.

await userRepository.destroy({
  filter: {
    status: "blocked",
  },
});

Constructor

It is usually not called directly by the developer, the instantiation is done mainly by specifying a coressponding repository type that is already registered in the parameter of db.colletion(). Repository type is registered through db.registerRepositories().

Signature

• constructor(collection: Collection)

Example

import { Repository } from '@nocobase/database';

class MyRepository extends Repository {
  async myQuery(sql) {
    return this.database.sequelize.query(sql);
  }
}

db.registerRepositories({
  books: MyRepository
});

db.collection({
  name: 'books',
  // here link to the registered repository
  repository: 'books'
});

await db.sync();

const books = db.getRepository('books') as MyRepository;
await books.myQuery('SELECT * FROM books;');

Instance Member

database

The database management instance where the context is located.

collection

The corresponding data table management instance.

model

The corresponding data model class.

Instance Method

find()

Find datasets from the database with the specified filtering conditions and sorting, etc.

Signature

• async find(options?: FindOptions): Promise<Model[]>

Type

type Filter = FilterWithOperator | FilterWithValue | FilterAnd | FilterOr;
type Appends = string[];
type Except = string[];
type Fields = string[];
type Sort = string[] | string;

interface SequelizeFindOptions {
  limit?: number;
  offset?: number;
}

interface FilterByTk {
  filterByTk?: TargetKey;
}

interface CommonFindOptions extends Transactionable {
  filter?: Filter;
  fields?: Fields;
  appends?: Appends;
  except?: Except;
  sort?: Sort;
}

type FindOptions = SequelizeFindOptions & CommonFindOptions & FilterByTk;

Detailed Information

filter: Filter

Query conditions for filtering data results. In the query parameters that passed in, key is the name of the field, value is the corresponding value. Operators can be used in conjunction with other filtering conditions.

// Find records with name "foo" and age above 18
repository.find({
  filter: {
    name: "foo",
    age: {
      $gt: 18,
    },
  }
})

Refer to Operators for more information.

filterByTk: TargetKey

Query data by TargetKey, this is shortcut for the filter parameter. The field of TargetKey can be configured in Collection, the default is primaryKey.

// By default, find records with id 1
repository.find({
  filterByTk: 1,
});

fields: string[]

Query columns. It is used to control which data fields to output. With this parameter, only the specified fields will be returned.

except: string[]

Exclude columns. It is used to control which data fields to output. With this parameter, the specified fields will not be returned.

appends: string[]

Append columns. It is used to load associated data. With this parameter, the specified associated fields will be returned together.

sort: string[] | string

Specify the sorting method of the query results. The input parameter is the name of the field, by default is to sort in the ascending order (asc); a - symbol needs to be added before the field name to sort in the descending order (desc). For example, ['-id', 'name'] means to sort by id desc, name asc.

limit: number

Limit the number of results, same as limit in SQL.

offset: number

The offset of the query, same as offset in SQL.

Example

const posts = db.getRepository('posts');

const results = await posts.find({
  filter: {
    createdAt: {
      $gt: '2022-01-01T00:00:00.000Z',
    }
  },
  fields: ['title'],
  appends: ['user'],
});

findOne()

Find a single piece of data from the database for specific conditions. Equivalent to Model.findOne() in Sequelize.

Signature

• async findOne(options?: FindOneOptions): Promise<Model | null>

Example

const posts = db.getRepository('posts');

const result = await posts.findOne({
  filterByTk: 1,
});

count()

Query a certain amount of data from the database for specific conditions. Equivalent to Model.count() in Sequelize.

Signature

• count(options?: CountOptions): Promise<number>

Type

interface CountOptions extends Omit<SequelizeCountOptions, 'distinct' | 'where' | 'include'>, Transactionable {
  filter?: Filter;
}

Example

const books = db.getRepository('books');

const count = await books.count({
  filter: {
    title: 'Three character classic'
  }
});

findAndCount()

Find datasets from the database with the specified filtering conditions and return the number of results. Equivalent to Model.findAndCountAll() in Sequelize.

Signature

• async findAndCount(options?: FindAndCountOptions): Promise<[Model[], number]>

Type

type FindAndCountOptions = Omit<SequelizeAndCountOptions, 'where' | 'include' | 'order'> & CommonFindOptions;

Detailed Information

The query parameters are the same as find(). An array is returned with the first element of the query results, and the second element of the total number of results.

create()

Inserts a newly created data into the data table. Equivalent to Model.create() in Sequelize. When the data object to be created carries any assiciated field, the corresponding assiciated data record is created or updated along with it.

Signature

• async create<M extends Model>(options: CreateOptions): Promise<M>

Example

const posts = db.getRepository('posts');

const result = await posts.create({
  values: {
    title: 'NocoBase 1.0 Release Notes',
    tags: [
      // Update data when there is a primary key and value of the associated table
      { id: 1 },
      // Create data when there is no primary key and value
      { name: 'NocoBase' },
    ]
  },
});

createMany()

Inserts multiple newly created data into the data table. This is equivalent to calling the create() method multiple times.

Signature

• createMany(options: CreateManyOptions): Promise<Model[]>

Type

interface CreateManyOptions extends BulkCreateOptions {
  records: Values[];
}

Detailed Information

• records: An array of data objects to be created.
• transaction: Transaction object. If no transaction parameter is passed, the method will automatically create an internal transaction.

Example

const posts = db.getRepository('posts');

const results = await posts.createMany({
  records: [
    {
      title: 'NocoBase 1.0 Release Notes',
      tags: [
        // Update data when there is a primary key and value of the associated table
        { id: 1 },
        // Create data when there is no primary key and value
        { name: 'NocoBase' },
      ]
    },
    {
      title: 'NocoBase 1.1 Release Notes',
      tags: [
        { id: 1 }
      ]
    },
  ],
});

update()

Update data in the data table. Equivalent to Model.update() in Sequelize. When the data object to be updated carries any associated field, the corresponding associated data record is created or updated along with it.

Signature

• async update<M extends Model>(options: UpdateOptions): Promise<M>

Example

const posts = db.getRepository('posts');

const result = await posts.update({
  filterByTk: 1,
  values: {
    title: 'NocoBase 1.0 Release Notes',
    tags: [
       // Update data when there is a primary key and value of the associated table
      { id: 1 },
       // Create data when there is no primary key and value
      { name: 'NocoBase' },
    ]
  },
});

destory()

Delete data from the data table. Equivalent to Model.destroy() in Sequelize.

Signature

• async destory(options?: TargetKey | TargetKey[] | DestoryOptions): Promise<number>

Type

interface DestroyOptions extends SequelizeDestroyOptions {
  filter?: Filter;
  filterByTk?: TargetKey | TargetKey[];
  truncate?: boolean;
  context?: any;
}

Detailed Information

• filter：Specify the filtering conditions of the records to be deleted. Refer to the find() method for the detailed usage of the filter.
• filterByTk：Specify the filtering conditions by TargetKey.
• truncate: Whether to empty the table data, this parameter is valid if no filter or filterByTk parameter is passed.
• transaction: Transaction object. If no transaction parameter is passed, the method will automatically create an internal transaction.