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---
stage: Verify
group: Pipeline Execution
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/product/ux/technical-writing/#assignments
---
# Merge Trains API **(PREMIUM)**
> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/36146) in GitLab 12.9.
> - Using this API you can consume [Merge Train](../ci/pipelines/merge_trains.md) entries.
Every API call to merge trains must be authenticated with Developer or higher [permissions](../user/permissions.md).
If a user is not a member of a project and the project is private, a `GET` request on that project returns a `404` status code.
If Merge Trains is not available for the project, a `403` status code is returned.
## Merge Trains API pagination
By default, `GET` requests return 20 results at a time because the API results
are paginated.
Read more on [pagination](rest/index.md#pagination).
## List Merge Trains for a project
Get all Merge Trains of the requested project:
```plaintext
GET /projects/:id/merge_trains
GET /projects/:id/merge_trains?scope=complete
```
| Attribute | Type | Required | Description |
| ------------------- | ---------------- | ---------- | --------------------------------------------------------------------------------------------------------------------------- |
| `id` | integer/string | yes | The ID or [URL-encoded path of the project](rest/index.md#namespaced-path-encoding). |
| `scope` | string | no | Return Merge Trains filtered by the given scope. Available scopes are `active` (to be merged) and `complete` (have been merged). |
| `sort` | string | no | Return Merge Trains sorted in `asc` or `desc` order. Default is `desc`. |
```shell
curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/1/merge_trains"
```
Example response:
```json
[
{
"id": 110,
"merge_request": {
"id": 126,
"iid": 59,
"project_id": 20,
"title": "Test MR 1580978354",
"description": "",
"state": "merged",
"created_at": "2020-02-06T08:39:14.883Z",
"updated_at": "2020-02-06T08:40:57.038Z",
"web_url": "http://local.gitlab.test:8181/root/merge-train-race-condition/-/merge_requests/59"
},
"user": {
"id": 1,
"name": "Administrator",
"username": "root",
"state": "active",
"avatar_url": "https://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon",
"web_url": "http://local.gitlab.test:8181/root"
},
"pipeline": {
"id": 246,
"sha": "bcc17a8ffd51be1afe45605e714085df28b80b13",
"ref": "refs/merge-requests/59/train",
"status": "success",
"created_at": "2020-02-06T08:40:42.410Z",
"updated_at": "2020-02-06T08:40:46.912Z",
"web_url": "http://local.gitlab.test:8181/root/merge-train-race-condition/pipelines/246"
},
"created_at": "2020-02-06T08:39:47.217Z",
"updated_at": "2020-02-06T08:40:57.720Z",
"target_branch": "feature-1580973432",
"status": "merged",
"merged_at": "2020-02-06T08:40:57.719Z",
"duration": 70
}
]
```
## List merge requests in a merge train
Get all merge requests added to a merge train for the requested target branch.
```plaintext
GET /projects/:id/merge_trains/:target_branch
```
Supported attributes:
| Attribute | Type | Required | Description |
| --------------- | ---------------| -------- | ------------ |
| `id` | integer/string | yes | The ID or [URL-encoded path of the project](rest/index.md#namespaced-path-encoding). |
| `target_branch` | string | yes | The target branch of the merge train. |
| `scope` | string | no | Return Merge Trains filtered by the given scope. Available scopes are `active` (to be merged) and `complete` (have been merged). |
| `sort` | string | no | Return Merge Trains sorted in `asc` or `desc` order. Default is `desc`. |
Example request:
```shell
curl --request GET --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/597/merge_trains/main"
```
Example response:
```json
[
{
"id": 267,
"merge_request": {
"id": 273,
"iid": 1,
"project_id": 597,
"title": "My title 9",
"description": null,
"state": "opened",
"created_at": "2022-10-31T19:06:05.725Z",
"updated_at": "2022-10-31T19:06:05.725Z",
"web_url": "http://localhost/namespace18/project21/-/merge_requests/1"
},
"user": {
"id": 933,
"username": "user12",
"name": "Sidney Jones31",
"state": "active",
"avatar_url": "https://www.gravatar.com/avatar/6c8365de387cb3db10ecc7b1880203c4?s=80\u0026d=identicon",
"web_url": "http://localhost/user12"
},
"pipeline": {
"id": 273,
"iid": 1,
"project_id": 598,
"sha": "b83d6e391c22777fca1ed3012fce84f633d7fed0",
"ref": "main",
"status": "pending",
"source": "push",
"created_at": "2022-10-31T19:06:06.231Z",
"updated_at": "2022-10-31T19:06:06.231Z",
"web_url": "http://localhost/namespace19/project22/-/pipelines/273"
},
"created_at": "2022-10-31T19:06:06.237Z",
"updated_at":"2022-10-31T19:06:06.237Z",
"target_branch":"main",
"status":"idle",
"merged_at":null,
"duration":null
}
]
```
## Get the status of a merge request on a merge train
Get merge train information for the requested merge request.
```plaintext
GET /projects/:id/merge_trains/merge_requests/:merge_request_iid
```
Supported attributes:
| Attribute | Type | Required | Description |
| ------------------- | -------------- | -------- | ------------------------------------------------------------------------------- |
| `id` | integer/string | yes | The ID or [URL-encoded path of the project](rest/index.md#namespaced-path-encoding). |
| `merge_request_iid` | integer | yes | The internal ID of the merge request. |
Example request:
```shell
curl --request GET --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/597/merge_trains/merge_requests/1"
```
Example response:
```json
{
"id": 267,
"merge_request": {
"id": 273,
"iid": 1,
"project_id": 597,
"title": "My title 9",
"description": null,
"state": "opened",
"created_at": "2022-10-31T19:06:05.725Z",
"updated_at": "2022-10-31T19:06:05.725Z",
"web_url": "http://localhost/namespace18/project21/-/merge_requests/1"
},
"user": {
"id": 933,
"username": "user12",
"name": "Sidney Jones31",
"state": "active",
"avatar_url": "https://www.gravatar.com/avatar/6c8365de387cb3db10ecc7b1880203c4?s=80\u0026d=identicon",
"web_url": "http://localhost/user12"
},
"pipeline": {
"id": 273,
"iid": 1,
"project_id": 598,
"sha": "b83d6e391c22777fca1ed3012fce84f633d7fed0",
"ref": "main",
"status": "pending",
"source": "push",
"created_at": "2022-10-31T19:06:06.231Z",
"updated_at": "2022-10-31T19:06:06.231Z",
"web_url": "http://localhost/namespace19/project22/-/pipelines/273"
},
"created_at": "2022-10-31T19:06:06.237Z",
"updated_at":"2022-10-31T19:06:06.237Z",
"target_branch":"main",
"status":"idle",
"merged_at":null,
"duration":null
}
```
## Add a merge request to a merge train
Add a merge request to the merge train targeting the merge request's target branch.
```plaintext
POST /projects/:id/merge_trains/merge_requests/:merge_request_iid
```
Supported attributes:
| Attribute | Type | Required | Description |
| ------------------------------ | -------------- | -------- | ----------- |
| `id` | integer/string | yes | The ID or [URL-encoded path of the project](rest/index.md#namespaced-path-encoding). |
| `merge_request_iid` | integer | yes | The internal ID of the merge request. |
| `when_pipeline_succeeds` | boolean | no | If true, the merge request is added to the merge train when the pipeline succeeds. When false or unspecified, the merge request is added directly to the merge train. |
| `sha` | string | no | If present, the SHA must match the `HEAD` of the source branch, otherwise the merge fails. |
| `squash` | boolean | no | If true, the commits are squashed into a single commit on merge. |
Example request:
```shell
curl --request POST --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/597/merge_trains/merge_requests/1"
```
Example response:
```json
[
{
"id": 267,
"merge_request": {
"id": 273,
"iid": 1,
"project_id": 597,
"title": "My title 9",
"description": null,
"state": "opened",
"created_at": "2022-10-31T19:06:05.725Z",
"updated_at": "2022-10-31T19:06:05.725Z",
"web_url": "http://localhost/namespace18/project21/-/merge_requests/1"
},
"user": {
"id": 933,
"username": "user12",
"name": "Sidney Jones31",
"state": "active",
"avatar_url": "https://www.gravatar.com/avatar/6c8365de387cb3db10ecc7b1880203c4?s=80\u0026d=identicon",
"web_url": "http://localhost/user12"
},
"pipeline": {
"id": 273,
"iid": 1,
"project_id": 598,
"sha": "b83d6e391c22777fca1ed3012fce84f633d7fed0",
"ref": "main",
"status": "pending",
"source": "push",
"created_at": "2022-10-31T19:06:06.231Z",
"updated_at": "2022-10-31T19:06:06.231Z",
"web_url": "http://localhost/namespace19/project22/-/pipelines/273"
},
"created_at": "2022-10-31T19:06:06.237Z",
"updated_at":"2022-10-31T19:06:06.237Z",
"target_branch":"main",
"status":"idle",
"merged_at":null,
"duration":null
}
]
```
|
