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How Do I Resolve Merge Conflicts?


I don’t suppose I’m alone in saying this; early in my profession, merge conflicts had been the bane of my existence (significantly in 2019). I graduated from a coding boot camp in 2018, and through that point, if I ever skilled a git situation that I didn’t know methods to repair, I’d create a brand new repository and begin over. In 2019, I began working as a software program engineer with a workforce of different software program engineers, so I couldn’t create new repositories to keep away from this inconvenience. I needed to face my fears and repair merge conflicts. No exaggeration; the expertise would convey me to tears. See the screenshot under of me making a self-deprecating joke about mishandling merge conflicts on July 14, 2019.

Rizel Scarlett @blackgirlbytes July 14, 2019 “Lmboo I be near the point of tears when I get suck in a merge conflict. I’m like, get me out of here.” Attached is a GIF of Eric Andre pulling a fence trying to get out of the area he’s in.

Thankfully, right this moment, I’m extra comfy with resolving merge conflicts. It nonetheless stresses me out a bit, however I’ve just a few ideas and methods I take advantage of to resolve the scenario.



Conditions to resolving a merge battle



Breathe


It’s okay. Conflicts occur. You’re not the primary particular person to expertise a merge battle. Everybody experiences merge conflicts ceaselessly no matter their seniority. It’s a typical prevalence in model management.



Perceive why merge conflicts occur

Model management programs, like Git, auto-magically handle code contributions. It identifies the change, when it was made, who made it, and on what line in order that builders can simply monitor the historical past of their codebase. Nevertheless, Git generally will get confused within the following conditions:

  • When a couple of particular person modifications the identical line in a file and tries to merge the change to the identical department
  • When a developer deletes a file, however one other developer edits it, they usually each attempt to merge their modifications to the identical department.
  • When a developer deletes a line, however one other developer edits it, they usually each attempt to merge their modifications to the identical department
  • When a developer is cherry-picking a commit, which is the act of choosing a commit from a department and making use of it to a different
  • When a developer is rebasing a department, which is the method of shifting a sequence of commits to a base commit

Git is not sure which change to use, so it leans on the developer for assist and notifies them of a merge battle. Your job is to assist Git decide which proposed change is most correct and updated.



Resolving Merge Conflicts



In Visible Studio Code (or IDE of your choice)

Learn the logs

Once you run git merge and a merge battle happens, your terminal or command immediate will reply with a message like:

CONFLICT (content material): Merge battle in [filename]

This message means a battle occurred on this specific file.

Discover the battle

Navigate to the file that Git indicated had a merge battle and scroll by means of the file till you discover the battle. Your IDE could point out the place the merge battle occurred by highlighting the modifications the conflicting modifications made to the file. The under instance reveals how VS code could spotlight the conflicting modifications. VS Code highlights the present change and the incoming change.

The present change (generally referred to as an outgoing change) represents the code modifications that you simply made in your native department.

The incoming change represents the code modifications you’re pulling in from the bottom department or modifications made by different builders.

Merge conflict being highlighted in Visual Studio Code

Determine which modifications should be utilized

Deciding if you wish to settle for present modifications, incoming modifications, or all of the modifications will depend on the last word aim on your program. This half is as much as you, your data of what modifications are wanted, and your workforce.

Should you’re not sure which modifications to simply accept, it’s greatest to seek the advice of along with your workforce or developer who wrote the incoming modifications. You’ll be able to settle for modifications with out committing the code and check program regionally for a sanity examine.

Take away any lingering ==== , <<<<, or >>>> symbols

These symbols are used that can assist you decide the place the merge conflicts occurred. Once you settle for the popular modifications, these symbols often disappear, however generally a glitch occurs, they usually don’t disappear. You don’t need by accident commit these symbols in the event that they persist within the file as a result of that may create bugs in your program.

What if I make a mistake?

Should you make a mistake otherwise you’re not assured which the choice change to simply accept, you may cease the merge course of by operating the next command:

`git merge -- abort`
Enter fullscreen mode

Exit fullscreen mode

After you do this, don’t sit there and get annoyed. Attain out to a teammate (ideally one whose code is conflicting with yours or an engineer you may belief) and clarify the scenario saying: “Hey, I’m experiencing a merge battle when I attempt to merge my code. I’m not feeling assured about which modifications I ought to settle for. Do you might have any availability to pair with me for a couple of minutes?”

Should you’re feeling assured in regards to the resolved merge battle, commit the modifications

After you settle for the required modifications and also you’re able to commit the change, you may take the next steps:

  • Save the information the place modifications had been made
  • Run git standing to make sure the fitting information had been modified
  • Run git add [file name] so as to add the information you modified to staging
  • Run git commit -m “[add your commit message here]” to commit your modifications
  • After which run git push



On GitHub.com

Establish which information have a merge battle

Once you open a PR on GitHub, it would let you recognize that there are merge conflicts and which information have conflicts.

Image description

Discover the conflicts

To search out the conflicts, click on ‘Resolve conflicts’, and it’ll lead you to the information with conflicts.

Determine which modifications should be utilized

The GitHub Net UI will spotlight the conflicting modifications with yellow and the next symbols: <<<<< ====, >>>>.

It is going to additionally point out which department these modifications are coming from. This could assist you decide which modifications you need to settle for.

Deciding if you wish to use the modifications out of your department, the bottom department, or each will depend on the last word aim on your program. This half is as much as you, your data of what modifications are wanted, and your workforce. Delete the strains you don’t need and hold those you do need.

Image description

Take away any lingering ==== , <<<<, or >>>> symbols

These symbols are used that can assist you decide the place the merge conflicts occurred.You don’t need by accident commit these symbols as a result of that may create bugs in your program.

Should you’re feeling assured in regards to the resolved merge battle, commit the modifications.

When you take away the conflicting modifications and any symbols used to focus on the conflicting modifications, click on ‘Mark as Resolved’ and click on the ‘Commit merge’ button to commit your modifications.

Image description

You’ll be able to learn extra about merge conflicts and methods to resolve them on GitHub’s official documentation.

Remark under when you have follow-up questions! Share this publish in the event you discover it useful.

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