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![[Simple SNS Project] Step 3. Building the Follow System & Timeline (N:M Relationship)](/_next/image?url=https%3A%2F%2Fres.cloudinary.com%2Fds3fvsnxb%2Fimage%2Fupload%2Fc_limit%2Cf_auto%2Cq_auto%3Abest%2Cw_800%2Cdpr_auto%2Cfl_progressive%2Cfl_strip_profile%2Fv1768031060%2Fblogwiz%2Farticles%2Fhmi84g9xzwnymck2oudx.jpg&w=3840&q=75)
backend•Jan 9, 2026
[Simple SNS Project] Step 3. Building the Follow System & Timeline (N:M Relationship)
In this step, I transformed the application into a real social network by implementing the Follow System, addressing the challenge of modeling relationships between users and efficiently retrieving timelines.
devTo
Original source
Key summary
In Step 3 of building a social network application, the author implemented a Follow System, addressing the challenge of modeling relationships between users and efficiently retrieving timelines. They used a Many-to-Many relationship mapping table called Follows in a Relational Database and adopted the Pull Model strategy for querying the database.
TL;DR
- Implemented a Follow System for a social network application
- Used a Many-to-Many relationship mapping table called Follows
- Added a UniqueConstraint to prevent duplicate follow requests
- Adopted the Pull Model strategy for querying the database
- Updated the React frontend to allow users to input a User ID and follow them
- Learned how to map entities using JPA and construct complex queries using Spring Data JPA
- Used Spring Data JPA's method naming conventions for complex queries
This content is automatically summarized using AI. For full context, always refer to the original article.
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