redirect from issue to pull request and vice versa

app/controllers/api/v1/issues_controller.rb

@@ -34,6 +34,7 @@ class Api::V1::IssuesController < Api::V1::BaseController
   end
 
   def show
+    redirect_to api_v1_project_pull_request_path(@project.id, @issue.serial_id) if @issue.pull_request
   end
 
   def create

app/controllers/api/v1/pull_requests_controller.rb

@@ -39,6 +39,7 @@ class Api::V1::PullRequestsController < Api::V1::BaseController
   end
 
   def show
+    redirect_to api_v1_project_issue_path(@project.id, @issue.serial_id) if @pull.nil?
   end
 
   def create

app/controllers/projects/pull_requests_controller.rb

@@ -79,8 +79,12 @@ class Projects::PullRequestsController < Projects::BaseController
   end
 
   def show
+    if @pull.nil?
+      redirect_to project_issue_path(@project, @issue)
+    else
       load_diff_commits_data
     end
+  end
 
   def index(status = 200)
     @issues_with_pull_request = @project.issues.joins(:pull_request)