Expose approvals required and approvals left

This change exposes merge request approvals required and approvals left
in the project merge requests GraphQL API.

doc/api/graphql/reference/gitlab_schema.graphql

@@ -9407,6 +9407,16 @@ type MergeRequest implements CurrentUserTodos & Noteable {
   """
   allowCollaboration: Boolean
 
+  """
+  Number of approvals left
+  """
+  approvalsLeft: Int
+
+  """
+  Number of approvals required
+  """
+  approvalsRequired: Int
+
   """
   Indicates if the merge request has all the required approvals. Returns true if no required approvals are configured.
   """

doc/api/graphql/reference/gitlab_schema.json

@@ -26108,6 +26108,34 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "approvalsLeft",
+              "description": "Number of approvals left",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "SCALAR",
+                "name": "Int",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "approvalsRequired",
+              "description": "Number of approvals required",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "SCALAR",
+                "name": "Int",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "approved",
               "description": "Indicates if the merge request has all the required approvals. Returns true if no required approvals are configured.",

doc/api/graphql/reference/index.md

@@ -1416,6 +1416,8 @@ Autogenerated return type of MarkAsSpamSnippet
 | Field | Type | Description |
 | ----- | ---- | ----------- |
 | `allowCollaboration` | Boolean | Indicates if members of the target project can push to the fork |
+| `approvalsLeft` | Int | Number of approvals left |
+| `approvalsRequired` | Int | Number of approvals required |
 | `approved` | Boolean! | Indicates if the merge request has all the required approvals. Returns true if no required approvals are configured. |
 | `author` | User | User who created this merge request |
 | `autoMergeEnabled` | Boolean! | Indicates if auto merge is enabled for the merge request |

ee/app/graphql/ee/types/merge_request_type.rb

@@ -8,6 +8,10 @@ module EE
       prepended do
         field :approved, GraphQL::BOOLEAN_TYPE, method: :approved?, null: false,
               description: 'Indicates if the merge request has all the required approvals. Returns true if no required approvals are configured.'
+        field :approvals_left, GraphQL::INT_TYPE, null: true,
+              description: 'Number of approvals left'
+        field :approvals_required, GraphQL::INT_TYPE, null: true,
+              description: 'Number of approvals required'
         field :approved_by, ::Types::UserType.connection_type, null: true,
               description: 'Users who approved the merge request'
 

ee/changelogs/unreleased/add-mr-approvals-required-and-approvals-left-to-graphql.yml

+---
+title: Expose approvals required and approvals left for merge requests in GraphQL
+merge_request: 42354
+author:
+type: changed

ee/spec/requests/api/graphql/project/merge_requests_spec.rb

@@ -49,4 +49,28 @@ RSpec.describe 'getting merge request listings (EE) nested in a project' do
 
     include_examples 'N+1 query check'
   end
+
+  context 'when requesting approval fields' do
+    let(:search_params) { { iids: [merge_request_a.iid.to_s] } }
+    let(:requested_fields) { [:approved, :approvals_left, :approvals_required] }
+    let(:approval_state) { instance_double(ApprovalState, approvals_required: 5, approvals_left: 3, approved?: false) }
+
+    before do
+      allow_next_found_instance_of(MergeRequest) do |mr|
+        allow(mr).to receive(:approval_state).and_return(approval_state)
+      end
+    end
+
+    it 'exposes approval metadata' do
+      execute_query
+
+      expect(results).to eq([
+        {
+          'approved' => false,
+          'approvalsLeft' => 3,
+          'approvalsRequired' => 5
+        }
+      ])
+    end
+  end
 end

spec/graphql/types/merge_request_type_spec.rb

@@ -32,6 +32,8 @@ RSpec.describe GitlabSchema.types['MergeRequest'] do
 
     if Gitlab.ee?
       expected_fields << 'approved'
+      expected_fields << 'approvals_left'
+      expected_fields << 'approvals_required'
       expected_fields << 'approved_by'
     end