You've finished a feature. It works on your machine. But should you merge it straight into main?
Two developers, one application. Both push directly to main. The changes overlap, a bug slips through, the pipeline goes red — and nobody can say who changed what, or why. Main is the one branch you cannot afford to break.
A pull request is a proposal to merge one branch into another. It gives the team a single place to read the code, discuss it, run the checks, and decide whether it's ready. Nothing moves until someone decides it should.
The workflow:
CREATE BRANCH -> PUSH -> OPEN PR -> REVIEW -> MERGE
git switch -c feature/payment-validation
git add .
git commit -m "Add payment validation"
git push -u origin feature/payment-validation
Then you open a pull request targeting main. Reviewers read the diff and leave comments. CI checks run against the branch. Once the team's requirements are satisfied, the changes can be merged.
A real round trip, from the video:
You're adding validation to a Rails Payment model — reject zero or negative amounts. You push the branch and open a PR describing the change. A teammate reads it and asks: "Can we add a test for negative amounts?" You push another commit. The PR updates itself. Checks go green, the review is approved, and the whole discussion stays on the record.
What a PR buys you:
- Code quality — catch problems before they land
- Collaboration — share knowledge, discuss decisions
- Automated checks — tests run on every push
- Traceability — the discussion stays attached to the change
And what it costs:
- Reviews take time — someone has to actually read it
- Big PRs get skimmed, and skimming is not reviewing
- Too many required approvers slows delivery to a crawl
- Approval is not proof — bugs still get through
So keep them small and focused. A pull request nobody can finish reading protects nobody.
Learn how to:
- Create and push a feature branch
- Open a pull request
- Review code changes
- Discuss improvements with teammates
- Run automated checks
- Merge approved changes
Chapters:
00:00 – What Is a Git Pull Request?
00:10 – The Problem with Unreviewed Code
00:25 – Understanding Pull Requests
00:40 – How the PR Workflow Works
01:00 – Practical Ruby on Rails Example
01:25 – Benefits and Trade-Offs
01:45 – Final Takeaway
Don't just push code. Propose it. Review it. Improve it.
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— #Astmation —
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