Challenge: Blog App

Overview

Your challenge is to build a blog application that implements relationships between different types of data using Holochain’s Links and Collections features.

Key Learning Goals

Through this challenge, you’ll gain practical experience with:

• Creating and managing links between entries
• Using Paths to create collections
• Retrieving data through relationship queries
• Designing a relational data structure in a distributed environment

Getting Started

The starter code and detailed instructions are available in the challenge repository:

Blog App Challenge Repository

You can view the difference between the starter code and the sample solution here.

Quick Setup

# Clone the repository
git clone https://github.com/CodeWithJV/holochain-challenge-2
cd holochain-challenge-2

# Enter the nix shell for development
nix develop

Tips

• Pay attention to how links are established between different entry types
• Remember that Paths are a powerful way to create predictable locations in the DHT
• When updating entries, make sure to update any relevant links as well
• Test your link queries thoroughly to ensure they return the expected data
• Use the tag field in links to store additional metadata when needed

Requirements

1. Create Blog Post Entry Types

   • Define a Post entry type with title, content, and timestamp
   • Implement functions to create and retrieve posts

2. Implement Comments

   • Create a Comment entry type
   • Link comments to their parent post
   • Create functions to add and retrieve comments for a post

3. Author Relationships

   • Link posts to their authors (agents)
   • Create functions to get all posts by a specific author

4. Collections with Paths

   • Create a collection of all posts using a Path
   • Implement a function to get all posts in the system
   • Add a function to get the latest posts

5. Updating Linked Content

   • Allow updating posts while maintaining comment links
   • Ensure updates preserve the relationship structure