# Issue links API

## List issue relations

Get a list of related issues of a given issue, sorted by the relationship creation datetime (ascending).
Issues will be filtered according to the user authorizations.

```
GET /projects/:id/issues/:issue_iid/links
```

Parameters:

| Attribute   | Type    | Required | Description                          |
|-------------|---------|----------|--------------------------------------|
| `id`        | integer/string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user  |
| `issue_iid` | integer | yes      | The internal ID of a project's issue |

```json
[
  {
    "id" : 84,
    "iid" : 14,
    "issue_link_id": 1
    "project_id" : 4,
    "created_at" : "2016-01-07T12:44:33.959Z",
    "title" : "Issues with auth",
    "state" : "opened",
    "assignees" : [],
    "assignee" : null,
    "labels" : [
      "bug"
    ],
    "author" : {
      "name" : "Alexandra Bashirian",
      "avatar_url" : null,
      "state" : "active",
      "web_url" : "https://gitlab.example.com/eileen.lowe",
      "id" : 18,
      "username" : "eileen.lowe"
    },
    "description" : null,
    "updated_at" : "2016-01-07T12:44:33.959Z",
    "milestone" : null,
    "subscribed" : true,
    "user_notes_count": 0,
    "due_date": null,
    "web_url": "http://example.com/example/example/issues/14",
    "confidential": false,
    "weight": null,
  }
]
```

## Create an issue link

Creates a two-way relation between two issues. User must be allowed to update both issues in order to succeed.

```
POST /projects/:id/issues/:issue_iid/links
```

| Attribute   | Type    | Required | Description                          |
|-------------|---------|----------|--------------------------------------|
| `id`        | integer/string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user  |
| `issue_iid` | integer | yes      | The internal ID of a project's issue |
| `target_project_id` | integer/string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) of a target project  |
| `target_issue_iid` | integer/string | yes      | The internal ID of a target project's issue |


```json
{
  "source_issue" : {
    "id" : 83,
    "iid" : 11,
    "project_id" : 4,
    "created_at" : "2016-01-07T12:44:33.959Z",
    "title" : "Issues with auth",
    "state" : "opened",
    "assignees" : [],
    "assignee" : null,
    "labels" : [
      "bug"
    ],
    "author" : {
      "name" : "Alexandra Bashirian",
      "avatar_url" : null,
      "state" : "active",
      "web_url" : "https://gitlab.example.com/eileen.lowe",
      "id" : 18,
      "username" : "eileen.lowe"
    },
    "description" : null,
    "updated_at" : "2016-01-07T12:44:33.959Z",
    "milestone" : null,
    "subscribed" : true,
    "user_notes_count": 0,
    "due_date": null,
    "web_url": "http://example.com/example/example/issues/11",
    "confidential": false,
    "weight": null,
  },
  "target_issue" : {
    "id" : 84,
    "iid" : 14,
    "project_id" : 4,
    "created_at" : "2016-01-07T12:44:33.959Z",
    "title" : "Issues with auth",
    "state" : "opened",
    "assignees" : [],
    "assignee" : null,
    "labels" : [
      "bug"
    ],
    "author" : {
      "name" : "Alexandra Bashirian",
      "avatar_url" : null,
      "state" : "active",
      "web_url" : "https://gitlab.example.com/eileen.lowe",
      "id" : 18,
      "username" : "eileen.lowe"
    },
    "description" : null,
    "updated_at" : "2016-01-07T12:44:33.959Z",
    "milestone" : null,
    "subscribed" : true,
    "user_notes_count": 0,
    "due_date": null,
    "web_url": "http://example.com/example/example/issues/14",
    "confidential": false,
    "weight": null,
  }
}
```

## Delete an issue link

Deletes an issue link, thus removes the two-way relationship.

```
DELETE /projects/:id/issues/:issue_iid/links/:issue_link_id
```


| Attribute   | Type    | Required | Description                          |
|-------------|---------|----------|--------------------------------------|
| `id`        | integer/string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user  |
| `issue_iid` | integer | yes      | The internal ID of a project's issue |
| `issue_link_id` | integer/string | yes      | The ID of an issue relationship |


```json
{
  "source_issue" : {
    "id" : 83,
    "iid" : 11,
    "project_id" : 4,
    "created_at" : "2016-01-07T12:44:33.959Z",
    "title" : "Issues with auth",
    "state" : "opened",
    "assignees" : [],
    "assignee" : null,
    "labels" : [
      "bug"
    ],
    "author" : {
      "name" : "Alexandra Bashirian",
      "avatar_url" : null,
      "state" : "active",
      "web_url" : "https://gitlab.example.com/eileen.lowe",
      "id" : 18,
      "username" : "eileen.lowe"
    },
    "description" : null,
    "updated_at" : "2016-01-07T12:44:33.959Z",
    "milestone" : null,
    "subscribed" : true,
    "user_notes_count": 0,
    "due_date": null,
    "web_url": "http://example.com/example/example/issues/11",
    "confidential": false,
    "weight": null,
  },
  "target_issue" : {
    "id" : 84,
    "iid" : 14,
    "project_id" : 4,
    "created_at" : "2016-01-07T12:44:33.959Z",
    "title" : "Issues with auth",
    "state" : "opened",
    "assignees" : [],
    "assignee" : null,
    "labels" : [
      "bug"
    ],
    "author" : {
      "name" : "Alexandra Bashirian",
      "avatar_url" : null,
      "state" : "active",
      "web_url" : "https://gitlab.example.com/eileen.lowe",
      "id" : 18,
      "username" : "eileen.lowe"
    },
    "description" : null,
    "updated_at" : "2016-01-07T12:44:33.959Z",
    "milestone" : null,
    "subscribed" : true,
    "user_notes_count": 0,
    "due_date": null,
    "web_url": "http://example.com/example/example/issues/14",
    "confidential": false,
    "weight": null,
  }
}
```
