pouchdb

Learning Path

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Welcome to pouchdb

Your guide to understanding the codebase

Change Guide

5 levels

15 learning units

  • Orchestration & APIs
    Pipelines, workflows, public interfaces • 3 units
  • Document Operations & Data Model
    API · 7
  • PouchDB Core Architecture
    Architecture · 2
  • Essential Patterns & Utilities
    Patterns · 4
  • Core Logic & Data
    Business rules, schemas, models • 3 units
  • Changes Feed & Query System
    API · 7
  • Integration Layer
    Integration · 12
  • Replication & Sync Protocol
    Workflow · 6
  • Interaction & Integration
    UI components, external connectors • 2 units
  • Comprehensive Test Architecture
    Testing · 5
  • Storage & Migration Systems
    Testing · 7
  • Cross-Cutting Concerns
    Auth, logging, config, testing • 2 units
  • Advanced Concurrency & Documentation
    Concurrency · 27
  • Performance & Reliability Testing
    Testing · 15
  • Edge Cases & Resilience
    Error handling, fault tolerance • 2 units
  • Additional Data Model Patterns
    Data Model · 2
  • Additional Error Handling Patterns
    Error Handling

Test Your Knowledge

24 questions across all levels

Progress

0/24 answered

Hands-On Assignment

2-3 hours

Your Challenge

Implement a document versioning plugin that maintains a complete history of document changes in a separate collection. When a document is updated or deleted, your plugin should automatically store the previous version in a {dbname}_history database with metadata about the change (timestamp, operation type, revision). This will allow developers to query historical versions and potentially restore previous states.

Starting Points

  • CONTRIBUTING.md:1-72
    Understand the project structure and how to set up your development environment for building and testing plugins

  • bin/build-module.js:1-66
    Study how PouchDB modules are built and packaged - your plugin will follow similar patterns

  • bin/build-node.sh:1-7
    See how the build process works for Node.js modules

Success Criteria

  • Plugin successfully intercepts put, post, and remove operations without breaking existing functionality
  • Previous document versions are stored in a separate {dbname}_history database with proper metadata
  • A getHistory(docId) method returns all historical versions of a document in chronological order
  • A restoreVersion(docId, timestamp) method can restore a document to a previous state
  • The plugin can be built using the existing build system (npm run build works)
  • History entries include: original document content, revision, timestamp, and operation type
  • Plugin handles edge cases: first document creation, missing history db, and deleted documents

Hints

  • (click to reveal)
  • Hint 1: Understanding PouchDB's plugin architecture conceptual
  • Hint 2: Accessing document state before changes implementation
  • Hint 3: Managing the history database implementation
  • Hint 4: Plugin structure and API code location
  • Hint 5: Handling edge cases conceptual

Prerequisites

  • JavaScript promises and async/await
  • PouchDB basic operations (put, get, remove)
  • Plugin architecture patterns
  • Document revision system basics