Add updated relationship to follow request API responses (#11800)

Fixes #11747

app/controllers/api/v1/follow_requests_controller.rb

@@ -14,12 +14,12 @@ class Api::V1::FollowRequestsController < Api::BaseController
   def authorize
     AuthorizeFollowService.new.call(account, current_account)
     NotifyService.new.call(current_account, Follow.find_by(account: account, target_account: current_account))
-    render_empty
+    render json: account, serializer: REST::RelationshipSerializer, relationships: relationships
   end
 
   def reject
     RejectFollowService.new.call(account, current_account)
-    render_empty
+    render json: account, serializer: REST::RelationshipSerializer, relationships: relationships
   end
 
   private
@@ -28,6 +28,10 @@ class Api::V1::FollowRequestsController < Api::BaseController
     Account.find(params[:id])
   end
 
+  def relationships(**options)
+    AccountRelationshipsPresenter.new([params[:id]], current_user.account_id, options)
+  end
+
   def load_accounts
     default_accounts.merge(paginated_follow_requests).to_a
   end

spec/controllers/api/v1/follow_requests_controller_spec.rb

@@ -38,6 +38,12 @@ RSpec.describe Api::V1::FollowRequestsController, type: :controller do
     it 'allows follower to follow' do
       expect(follower.following?(user.account)).to be true
     end
+
+    it 'returns JSON with followed_by=true' do
+      json = body_as_json
+
+      expect(json[:followed_by]).to be true
+    end
   end
 
   describe 'POST #reject' do
@@ -54,5 +60,11 @@ RSpec.describe Api::V1::FollowRequestsController, type: :controller do
     it 'removes follow request' do
       expect(FollowRequest.where(target_account: user.account, account: follower).count).to eq 0
     end
+
+    it 'returns JSON with followed_by=false' do
+      json = body_as_json
+
+      expect(json[:followed_by]).to be false
+    end
   end
 end