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electrodb
Advanced tools
A library to more easily create and interact with multiple entities and heretical relationships in dynamodb
ElectroDB is a DynamoDB library that simplifies the process of defining and interacting with DynamoDB tables. It provides a high-level abstraction for defining entities, managing relationships, and performing CRUD operations, making it easier to work with DynamoDB's complex data modeling and querying capabilities.
Entity Definition
This feature allows you to define an entity with its attributes and indexes. The code sample demonstrates how to create a User entity with attributes like userId, name, and email, and a primary index.
const { Entity } = require('electrodb');
const UserEntity = new Entity({
model: {
entity: 'User',
version: '1',
service: 'UserService'
},
attributes: {
userId: { type: 'string', required: true },
name: { type: 'string', required: true },
email: { type: 'string', required: true }
},
indexes: {
primary: {
pk: { field: 'pk', composite: ['userId'] },
sk: { field: 'sk', composite: [] }
}
}
});
CRUD Operations
This feature provides methods for performing CRUD operations on the defined entities. The code sample shows how to create, read, update, and delete a user entity.
const user = await UserEntity.put({
userId: '123',
name: 'John Doe',
email: 'john.doe@example.com'
}).go();
const fetchedUser = await UserEntity.get({ userId: '123' }).go();
const updatedUser = await UserEntity.update({ userId: '123' })
.set({ name: 'Jane Doe' })
.go();
const deletedUser = await UserEntity.delete({ userId: '123' }).go();
Querying
This feature allows you to perform complex queries on your entities. The code sample demonstrates how to query the User entity using the primary index.
const users = await UserEntity.query.primary({ userId: '123' }).go();
Relationships
This feature allows you to define and manage relationships between different entities. The code sample shows how to fetch a user along with their related orders using the Service class.
const { Service } = require('electrodb');
const UserService = new Service({
User: UserEntity,
Order: OrderEntity
});
const userWithOrders = await UserService.User.get({ userId: '123' }).include(OrderEntity).go();
DynamoDB Toolbox is a set of tools that makes it easier to work with Amazon DynamoDB. It provides a simple and consistent way to define and interact with DynamoDB tables and items. Compared to ElectroDB, DynamoDB Toolbox offers a more lightweight and flexible approach but may require more manual setup for complex data models.
The AWS SDK for JavaScript provides a comprehensive set of tools for interacting with AWS services, including DynamoDB. While it offers low-level access to DynamoDB's API, it lacks the high-level abstractions and convenience features provided by ElectroDB, making it more suitable for developers who need fine-grained control over their DynamoDB interactions.
Dynogels is a DynamoDB data mapper for Node.js that simplifies the process of defining and interacting with DynamoDB tables. It offers a similar high-level abstraction as ElectroDB but is less actively maintained and may not support some of the latest DynamoDB features.
ElectroDB is a DynamoDB library to ease the use of having multiple entities and complex hierarchical relationships in a single DynamoDB table.
Please submit issues/feedback or reach out on Twitter @tinkertamper.
ElectroDB's new website for Documentation is now live at www.ElectroDB.dev.
Try out and share ElectroDB Models, Services, and Single Table Design at electrodb.fun
ExpressionAttributeNames
, ExpressionAttributeValues
, and FilterExpressions
.ExpressionAttributeNames
, ExpressionAttributeValues
, and ConditionExpressions
.ExpressionAttributeNames
, ExpressionAttributeValues
, and UpdateExpressions
..find()
or .match()
methods to dynamically and efficiently query based on defined sort key structures.Entities
, Services
, Models
directly from the command line.Entities
, Services
, Models
for easier prototyping.Turn this
tasks
.patch({
team: "core",
task: "45-662",
project: "backend"
})
.set({ status: "open" })
.add({ points: 5 })
.append({
comments: [{
user: "janet",
body: "This seems half-baked."
}]
})
.where(( {status}, {eq} ) => eq(status, "in-progress"))
.go();
Into This
{
"UpdateExpression": "SET #status = :status_u0, #points = #points + :points_u0, #comments = list_append(#comments, :comments_u0), #updatedAt = :updatedAt_u0, #gsi1sk = :gsi1sk_u0",
"ExpressionAttributeNames": {
"#status": "status",
"#points": "points",
"#comments": "comments",
"#updatedAt": "updatedAt",
"#gsi1sk": "gsi1sk"
},
"ExpressionAttributeValues": {
":status0": "in-progress",
":status_u0": "open",
":points_u0": 5,
":comments_u0": [
{
"user": "janet",
"body": "This seems half-baked."
}
],
":updatedAt_u0": 1630977029015,
":gsi1sk_u0": "$assignments#tasks_1#status_open"
},
"TableName": "your_table_name",
"Key": {
"pk": "$taskapp#team_core",
"sk": "$tasks_1#project_backend#task_45-662"
},
"ConditionExpression": "attribute_exists(pk) AND attribute_exists(sk) AND #status = :status0"
}
[2.7.1] - 2023-07-03
if_not_exists()
if the attribute is not a composite attribute in an index.FAQs
A library to more easily create and interact with multiple entities and heretical relationships in dynamodb
The npm package electrodb receives a total of 411,753 weekly downloads. As such, electrodb popularity was classified as popular.
We found that electrodb demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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