Expose UserInteractions for participants of a merge request

MR: gitlab.com/gitlab-org/gitlab/-/merge_requests/82257
Issue: gitlab.com/gitlab-org/gitlab/-/issues/353982

Changelog: added

app/graphql/types/merge_request_type.rb

@@ -137,7 +137,7 @@ module Types
           null: true,
           complexity: 5,
           description: 'Assignees of the merge request.'
-    field :author, Types::UserType, null: true,
+    field :author, Types::MergeRequests::AuthorType, null: true,
           description: 'User who created this merge request.'
     field :discussion_locked, GraphQL::Types::Boolean,
           description: 'Indicates if comments on the merge request are locked to members only.',
@@ -150,7 +150,7 @@ module Types
           description: 'Labels of the merge request.'
     field :milestone, Types::MilestoneType, null: true,
           description: 'Milestone of the merge request.'
-    field :participants, Types::UserType.connection_type, null: true, complexity: 15,
+    field :participants, Types::MergeRequests::ParticipantType.connection_type, null: true, complexity: 15,
           description: 'Participants in the merge request. This includes the author, assignees, reviewers, and users mentioned in notes.',
           resolver: Resolvers::Users::ParticipantsResolver
     field :reference, GraphQL::Types::String, null: false, method: :to_reference,

app/graphql/types/merge_requests/assignee_type.rb

@@ -6,7 +6,6 @@ module Types
       graphql_name 'MergeRequestAssignee'
       description 'A user assigned to a merge request.'
 
-      include FindClosest
       include ::Types::MergeRequests::InteractsWithMergeRequest
 
       authorize :read_user

app/graphql/types/merge_requests/author_type.rb

+# frozen_string_literal: true
+
+module Types
+  module MergeRequests
+    class AuthorType < ::Types::UserType
+      graphql_name 'MergeRequestAuthor'
+      description 'The author of the merge request.'
+
+      include ::Types::MergeRequests::InteractsWithMergeRequest
+
+      authorize :read_user
+    end
+  end
+end

app/graphql/types/merge_requests/participant_type.rb

+# frozen_string_literal: true
+
+module Types
+  module MergeRequests
+    class ParticipantType < ::Types::UserType
+      graphql_name 'MergeRequestParticipant'
+      description 'A user participating in a merge request.'
+
+      include ::Types::MergeRequests::InteractsWithMergeRequest
+
+      authorize :read_user
+    end
+  end
+end

app/graphql/types/merge_requests/reviewer_type.rb

@@ -6,7 +6,6 @@ module Types
       graphql_name 'MergeRequestReviewer'
       description 'A user assigned to a merge request as a reviewer.'
 
-      include FindClosest
       include ::Types::MergeRequests::InteractsWithMergeRequest
 
       authorize :read_user

spec/graphql/types/merge_requests/assignee_type_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe GitlabSchema.types['MergeRequestAssignee'] do
+  it_behaves_like "a user type with merge request interaction type"
+end

spec/graphql/types/merge_requests/author_type_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe GitlabSchema.types['MergeRequestAuthor'] do
+  it_behaves_like "a user type with merge request interaction type"
+end

spec/graphql/types/merge_requests/participant_type_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe GitlabSchema.types['MergeRequestParticipant'] do
+  it_behaves_like "a user type with merge request interaction type"
+end

spec/graphql/types/merge_requests/reviewer_type_spec.rb

@@ -3,55 +3,5 @@
 require 'spec_helper'
 
 RSpec.describe GitlabSchema.types['MergeRequestReviewer'] do
-  specify { expect(described_class).to require_graphql_authorizations(:read_user) }
-
-  it 'has the expected fields' do
-    expected_fields = %w[
-      id
-      bot
-      user_permissions
-      snippets
-      name
-      username
-      email
-      publicEmail
-      avatarUrl
-      webUrl
-      webPath
-      todos
-      state
-      status
-      location
-      authoredMergeRequests
-      assignedMergeRequests
-      reviewRequestedMergeRequests
-      groupMemberships
-      groupCount
-      projectMemberships
-      starredProjects
-      callouts
-      merge_request_interaction
-      namespace
-      timelogs
-      groups
-      gitpodEnabled
-      preferencesGitpodPath
-      profileEnableGitpodPath
-      savedReplies
-    ]
-
-    expect(described_class).to have_graphql_fields(*expected_fields)
-  end
-
-  describe '#merge_request_interaction' do
-    subject { described_class.fields['mergeRequestInteraction'] }
-
-    it 'returns the correct type' do
-      is_expected.to have_graphql_type(Types::UserMergeRequestInteractionType)
-    end
-
-    it 'has the correct arguments' do
-      is_expected.to have_attributes(arguments: be_empty)
-    end
-  end
+  it_behaves_like "a user type with merge request interaction type"
 end

spec/support/shared_examples/graphql/types/merge_request_interactions_type_shared_examples.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.shared_examples "a user type with merge request interaction type" do
+  specify { expect(described_class).to require_graphql_authorizations(:read_user) }
+
+  it 'has the expected fields' do
+    expected_fields = %w[
+      id
+      bot
+      user_permissions
+      snippets
+      name
+      username
+      email
+      publicEmail
+      avatarUrl
+      webUrl
+      webPath
+      todos
+      state
+      status
+      location
+      authoredMergeRequests
+      assignedMergeRequests
+      reviewRequestedMergeRequests
+      groupMemberships
+      groupCount
+      projectMemberships
+      starredProjects
+      callouts
+      merge_request_interaction
+      namespace
+      timelogs
+      groups
+      gitpodEnabled
+      preferencesGitpodPath
+      profileEnableGitpodPath
+      savedReplies
+    ]
+
+    expect(described_class).to have_graphql_fields(*expected_fields)
+  end
+
+  describe '#merge_request_interaction' do
+    subject { described_class.fields['mergeRequestInteraction'] }
+
+    it 'returns the correct type' do
+      is_expected.to have_graphql_type(Types::UserMergeRequestInteractionType)
+    end
+
+    it 'has the correct arguments' do
+      is_expected.to have_attributes(arguments: be_empty)
+    end
+  end
+end