API issues - support filtering by iids

4 files changed, 68 insertions, 1 deletions

diff --git a/changelogs/unreleased/28257-issues-iids.yml b/changelogs/unreleased/28257-issues-iids.yml
new file mode 100644
index 00000000000..0a85504a8de
--- /dev/null
+++ b/changelogs/unreleased/28257-issues-iids.yml
@@ -0,0 +1,4 @@
+---
+title: API issues - support filtering by iids
+merge_request:
+author:
diff --git a/doc/api/issues.md b/doc/api/issues.md
index 5266077e098..bd72b9190fe 100644
--- a/doc/api/issues.md
+++ b/doc/api/issues.md
@@ -25,6 +25,7 @@ GET /issues?labels=foo,bar
 GET /issues?labels=foo,bar&state=opened
 GET /issues?milestone=1.0.0
 GET /issues?milestone=1.0.0&state=opened
+GET /issues?iids[]=42&iids[]=43
 ```
 
 | Attribute | Type | Required | Description |
@@ -32,6 +33,7 @@ GET /issues?milestone=1.0.0&state=opened
 | `state`   | string  | no    | Return all issues or just those that are `opened` or `closed`|
 | `labels`  | string  | no    | Comma-separated list of label names, issues must have all labels to be returned |
 | `milestone` | string| no    | The milestone title |
+| `iids`    | Array[integer] | no | Return only the issues having the given `iid` |
 | `order_by`| string  | no    | Return requests ordered by `created_at` or `updated_at` fields. Default is `created_at` |
 | `sort`    | string  | no    | Return requests sorted in `asc` or `desc` order. Default is `desc`  |
 
@@ -102,6 +104,7 @@ GET /groups/:id/issues?labels=foo,bar
 GET /groups/:id/issues?labels=foo,bar&state=opened
 GET /groups/:id/issues?milestone=1.0.0
 GET /groups/:id/issues?milestone=1.0.0&state=opened
+GET /groups/:id/issues?iids[]=42&iids[]=43
 ```
 
 | Attribute | Type | Required | Description |
@@ -109,6 +112,7 @@ GET /groups/:id/issues?milestone=1.0.0&state=opened
 | `id`      | integer | yes   | The ID of a group |
 | `state`   | string  | no    | Return all issues or just those that are `opened` or `closed`|
 | `labels`  | string  | no    | Comma-separated list of label names, issues must have all labels to be returned |
+| `iids`    | Array[integer] | no | Return only the issues having the given `iid` |
 | `milestone` | string| no    | The milestone title |
 | `order_by`| string  | no    | Return requests ordered by `created_at` or `updated_at` fields. Default is `created_at` |
 | `sort`    | string  | no    | Return requests sorted in `asc` or `desc` order. Default is `desc`  |
@@ -181,12 +185,13 @@ GET /projects/:id/issues?labels=foo,bar
 GET /projects/:id/issues?labels=foo,bar&state=opened
 GET /projects/:id/issues?milestone=1.0.0
 GET /projects/:id/issues?milestone=1.0.0&state=opened
+GET /projects/:id/issues?iids[]=42&iids[]=43
 ```
 
 | Attribute | Type | Required | Description |
 | --------- | ---- | -------- | ----------- |
 | `id`      | integer | yes   | The ID of a project |
-| `iid`     | integer | no    | Return the issue having the given `iid` |
+| `iids`    | Array[integer] | no | Return only the milestone having the given `iid` |
 | `state`   | string  | no    | Return all issues or just those that are `opened` or `closed`|
 | `labels`  | string  | no    | Comma-separated list of label names, issues must have all labels to be returned |
 | `milestone` | string| no    | The milestone title |
diff --git a/lib/api/issues.rb b/lib/api/issues.rb
index 6d30c5d81b1..1d6d0b05750 100644
--- a/lib/api/issues.rb
+++ b/lib/api/issues.rb
@@ -25,6 +25,7 @@ module API
         optional :sort, type: String, values: %w[asc desc], default: 'desc',
                         desc: 'Return issues sorted in `asc` or `desc` order.'
         optional :milestone, type: String, desc: 'Return issues for a specific milestone'
+        optional :iids, type: Array[Integer], desc: 'The IID array of issues'
         use :pagination
       end
 
diff --git a/spec/requests/api/issues_spec.rb b/spec/requests/api/issues_spec.rb
index 7cb75310204..237c5512960 100644
--- a/spec/requests/api/issues_spec.rb
+++ b/spec/requests/api/issues_spec.rb
@@ -212,6 +212,25 @@ describe API::Issues, api: true  do
         expect(json_response.first['id']).to eq(confidential_issue.id)
       end
 
+      it 'returns an array of issues found by iids' do
+        get api('/issues', user), iids: [closed_issue.iid]
+
+        expect(response).to have_http_status(200)
+        expect(response).to include_pagination_headers
+        expect(json_response).to be_an Array
+        expect(json_response.length).to eq(1)
+        expect(json_response.first['id']).to eq(closed_issue.id)
+      end
+
+      it 'returns an empty array if iid does not exist' do
+        get api("/issues", user), iids: [99999]
+
+        expect(response).to have_http_status(200)
+        expect(response).to include_pagination_headers
+        expect(json_response).to be_an Array
+        expect(json_response.length).to eq(0)
+      end
+
       it 'sorts by created_at descending by default' do
         get api('/issues', user)
 
@@ -377,6 +396,25 @@ describe API::Issues, api: true  do
       expect(json_response.first['labels']).to eq([label_c.title, label_b.title, group_label.title])
     end
 
+    it 'returns an array of issues found by iids' do
+      get api(base_url, user), iids: [group_issue.iid]
+
+      expect(response).to have_http_status(200)
+      expect(response).to include_pagination_headers
+      expect(json_response).to be_an Array
+      expect(json_response.length).to eq(1)
+      expect(json_response.first['id']).to eq(group_issue.id)
+    end
+
+    it 'returns an empty array if iid does not exist' do
+      get api(base_url, user), iids: [99999]
+
+      expect(response).to have_http_status(200)
+      expect(response).to include_pagination_headers
+      expect(json_response).to be_an Array
+      expect(json_response.length).to eq(0)
+    end
+
     it 'returns an empty array if no group issue matches labels' do
       get api("#{base_url}?labels=foo,bar", user)
 
@@ -586,6 +624,25 @@ describe API::Issues, api: true  do
       expect(json_response.first['labels']).to eq([label_c.title, label_b.title, label.title])
     end
 
+    it 'returns an array of issues found by iids' do
+      get api("#{base_url}/issues", user), iids: [issue.iid]
+
+      expect(response).to have_http_status(200)
+      expect(response).to include_pagination_headers
+      expect(json_response).to be_an Array
+      expect(json_response.length).to eq(1)
+      expect(json_response.first['id']).to eq(issue.id)
+    end
+
+    it 'returns an empty array if iid does not exist' do
+      get api("#{base_url}/issues", user), iids: [99999]
+
+      expect(response).to have_http_status(200)
+      expect(response).to include_pagination_headers
+      expect(json_response).to be_an Array
+      expect(json_response.length).to eq(0)
+    end
+
     it 'returns an empty array if not all labels matches' do
       get api("#{base_url}/issues?labels=#{label.title},foo", user)