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# Merge requests
Merge requests allow you to exchange changes you made to source code and
collaborate with other people on the same project.
## Overview
A Merge Request (**MR**) is the basis of GitLab as a code collaboration
and version control platform.
Is it simple as the name implies: a _request_ to _merge_ one branch into another.
With GitLab merge requests, you can:
- Compare the changes between two [branches](https://git-scm.com/book/en/v2/Git-Branching-Branches-in-a-Nutshell#_git_branching)
- [Review and discuss](../../discussions/index.md#discussions) the proposed modifications inline
- Live preview the changes when [Review Apps](../../../ci/review_apps/index.md) is configured for your project
- Build, test, and deploy your code in a per-branch basis with built-in [GitLab CI/CD](../../../ci/README.md)
- Prevent the merge request from being merged before it's ready with [WIP MRs](#work-in-progress-merge-requests)
- View the deployment process through [Pipeline Graphs](../../../ci/pipelines.md#pipeline-graphs)
- [Automatically close the issue(s)](../../project/issues/closing_issues.md#via-merge-request) that originated the implementation proposed in the merge request
- Assign it to any registered user, and change the assignee how many times you need
- Assign a [milestone](../../project/milestones/index.md) and track the development of a broader implementation
- Organize your issues and merge requests consistently throughout the project with [labels](../../project/labels.md)
- Add a time estimation and the time spent with that merge request with [Time Tracking](../../../workflow/time_tracking.html#time-tracking)
- [Resolve merge conflicts from the UI](#resolve-conflicts)
With **[GitLab Enterprise Edition][ee]**, you can also:
- View the deployment process across projects with [Multi-Project Pipeline Graphs](https://docs.gitlab.com/ee/ci/multi_project_pipeline_graphs.html#multi-project-pipeline-graphs) (available only in GitLab Enterprise Edition Premium)
- Request [approvals](https://docs.gitlab.com/ee/user/project/merge_requests/merge_request_approvals.html) from your managers (available in GitLab Enterprise Edition Starter)
- Enable [fast-forward merge requests](https://docs.gitlab.com/ee/user/project/merge_requests/fast_forward_merge.html) (available in GitLab Enterprise Edition Starter)
- [Squash and merge](https://docs.gitlab.com/ee/user/project/merge_requests/squash_and_merge.html) for a cleaner commit history (available in GitLab Enterprise Edition Starter)
- Enable [semi-linear history merge requests](https://docs.gitlab.com/ee/user/project/merge_requests/index.html#semi-linear-history-merge-requests) as another security layer to guarantee the pipeline is passing in the target branch (available in GitLab Enterprise Edition Starter)
- Analise the impact of your changes with [Code Quality reports](https://docs.gitlab.com/ee/user/project/merge_requests/code_quality_diff.html) (available in GitLab Enterprise Edition Starter)
## Use cases
A. Consider you are a software developer working in a team:
1. You checkout a new branch, and submit your changes through a merge request
1. You gather feedback from your team
1. You work on the implementation optimizing code with [Code Quality reports](https://docs.gitlab.com/ee/user/project/merge_requests/code_quality_diff.html) (available in GitLab Enterprise Edition Starter)
1. You build and test your changes with GitLab CI/CD
1. You request the approval from your manager
1. Your manager pushes a commit with his final review, [approves the merge request](https://docs.gitlab.com/ee/user/project/merge_requests/merge_request_approvals.html), and set it to [merge when pipeline succeeds](#merge-when-pipeline-succeeds) (Merge Request Approvals are available in GitLab Enterprise Edition Starter)
1. Your changes get deployed to production with [manual actions](../../../ci/yaml/README.md#manual-actions) for GitLab CI/CD
1. Your implementations were successfully shipped to your customer
B. Consider you're a web developer writing a webpage for your company's:
1. You checkout a new branch, and submit a new page through a merge request
1. You gather feedback from your reviewers
1. Your changes are previewed with [Review Apps](../../../ci/review_apps/index.md)
1. You request your web designers for their implementation
1. You request the [approval](https://docs.gitlab.com/ee/user/project/merge_requests/merge_request_approvals.html) from your manager (available in GitLab Enterprise Edition Starter)
1. Once approved, your merge request is [squashed and merged](https://docs.gitlab.com/ee/user/project/merge_requests/squash_and_merge.html), and [deployed to staging with GitLab Pages](https://about.gitlab.com/2016/08/26/ci-deployment-and-environments/) (Squash and Merge is available in GitLab Enterprise Edition Starter)
1. Your production team [cherry picks](#cherry-pick-changes) the merge commit into production
## Authorization for merge requests
There are two main ways to have a merge request flow with GitLab:
1. Working with [protected branches][] in a single repository
1. Working with forks of an authoritative project
[Learn more about the authorization for merge requests.](authorization_for_merge_requests.md)
## Cherry-pick changes
Cherry-pick any commit in the UI by simply clicking the **Cherry-pick** button
in a merged merge requests or a commit.
[Learn more about cherry-picking changes.](cherry_pick_changes.md)
## Merge when pipeline succeeds
When reviewing a merge request that looks ready to merge but still has one or
more CI jobs running, you can set it to be merged automatically when CI
pipeline succeeds. This way, you don't have to wait for the pipeline to finish
and remember to merge the request manually.
[Learn more about merging when pipeline succeeds.](merge_when_pipeline_succeeds.md)
## Resolve discussion comments in merge requests reviews
Keep track of the progress during a code review with resolving comments.
Resolving comments prevents you from forgetting to address feedback and lets
you hide discussions that are no longer relevant.
[Read more about resolving discussion comments in merge requests reviews.](../../discussions/index.md)
## Resolve conflicts
When a merge request has conflicts, GitLab may provide the option to resolve
those conflicts in the GitLab UI.
[Learn more about resolving merge conflicts in the UI.](resolve_conflicts.md)
## Revert changes
GitLab implements Git's powerful feature to revert any commit with introducing
a **Revert** button in merge requests and commit details.
[Learn more about reverting changes in the UI](revert_changes.md)
## Merge requests versions
Every time you push to a branch that is tied to a merge request, a new version
of merge request diff is created. When you visit a merge request that contains
more than one pushes, you can select and compare the versions of those merge
request diffs.
[Read more about the merge requests versions.](versions.md)
## Work In Progress merge requests
To prevent merge requests from accidentally being accepted before they're
completely ready, GitLab blocks the "Accept" button for merge requests that
have been marked as a **Work In Progress**.
[Learn more about settings a merge request as "Work In Progress".](work_in_progress_merge_requests.md)
## Ignore whitespace changes in Merge Request diff view
If you click the **Hide whitespace changes** button, you can see the diff
without whitespace changes (if there are any). This is also working when on a
specific commit page.
>**Tip:**
You can append `?w=1` while on the diffs page of a merge request to ignore any
whitespace changes.
## Live preview with Review Apps
If you configured [Review Apps](https://about.gitlab.com/features/review-apps/) for your project,
you can preview the changes submitted to a feature-branch through a merge request
in a per-branch basis. No need to checkout the branch, install and preview locally;
all your changes will be available to preview by anyone with the Review Apps link.
[Read more about Review Apps.](../../../ci/review_apps/index.md)
## Tips
Here are some tips that will help you be more efficient with merge requests in
the command line.
> **Note:**
This section might move in its own document in the future.
### Checkout merge requests locally
A merge request contains all the history from a repository, plus the additional
commits added to the branch associated with the merge request. Here's a few
tricks to checkout a merge request locally.
Please note that you can checkout a merge request locally even if the source
project is a fork (even a private fork) of the target project.
#### Checkout locally by adding a git alias
Add the following alias to your `~/.gitconfig`:
```
[alias]
mr = !sh -c 'git fetch $1 merge-requests/$2/head:mr-$1-$2 && git checkout mr-$1-$2' -
```
Now you can check out a particular merge request from any repository and any
remote. For example, to check out the merge request with ID 5 as shown in GitLab
from the `upstream` remote, do:
```
git mr upstream 5
```
This will fetch the merge request into a local `mr-upstream-5` branch and check
it out.
#### Checkout locally by modifying `.git/config` for a given repository
Locate the section for your GitLab remote in the `.git/config` file. It looks
like this:
```
[remote "origin"]
url = https://gitlab.com/gitlab-org/gitlab-ce.git
fetch = +refs/heads/*:refs/remotes/origin/*
```
You can open the file with:
```
git config -e
```
Now add the following line to the above section:
```
fetch = +refs/merge-requests/*/head:refs/remotes/origin/merge-requests/*
```
In the end, it should look like this:
```
[remote "origin"]
url = https://gitlab.com/gitlab-org/gitlab-ce.git
fetch = +refs/heads/*:refs/remotes/origin/*
fetch = +refs/merge-requests/*/head:refs/remotes/origin/merge-requests/*
```
Now you can fetch all the merge requests:
```
git fetch origin
...
From https://gitlab.com/gitlab-org/gitlab-ce.git
* [new ref] refs/merge-requests/1/head -> origin/merge-requests/1
* [new ref] refs/merge-requests/2/head -> origin/merge-requests/2
...
```
And to check out a particular merge request:
```
git checkout origin/merge-requests/1
```
[protected branches]: ../protected_branches.md
[ee]: https://about.gitlab.com/gitlab-ee/ "GitLab Enterprise Edition"
|
