port to redmine 6 by using after_plugins_loaded and prepend

Author: jkalbhenn

init.rb

@@ -1,11 +1,43 @@
-require 'redmine'
-require 'redmine_redirect_after_create/issues_controller_patch'
-require 'redmine_redirect_after_create/routes_helper_patch'
+module RedmineRedirectAfterCreate
+  module IssuesControllerPatch
+    def self.prepended(base)
+      def redirect_after_create
+        redirect_url = params[:redirect_url].to_s
+        if redirect_url.present? && valid_back_url?(redirect_url)
+          redirect_to redirect_url
+        else
+          super
+        end
+      end
+    end
+  end
+
+  module RoutesHelperPatch
+    def self.prepended(base)
+      def _project_issues_path(project, *args)
+        if params[:redirect_url]
+          options = args.extract_options!
+          options = options.reverse_merge redirect_url: params[:redirect_url]
+          args << options
+        end
+        super project, *args
+      end
+    end
+  end
+end
+
+class AfterPluginsLoadedHook < Redmine::Hook::Listener
+  def after_plugins_loaded(_context = {})
+    IssuesController.prepend RedmineRedirectAfterCreate::IssuesControllerPatch
+    RoutesHelper.prepend RedmineRedirectAfterCreate::RoutesHelperPatch
+  end
+end
 
 Redmine::Plugin.register :redmine_redirect_after_create do
-  name 'Redmine redirect after create plugin'
-  author 'Intera GmbH'
-  description 'This plugin redirects the user to a custom URL after ticket creation based on a URL parameter.'
-  version '0.0.1'
-  url 'https://github.com/Intera/redmine_redirect_after_create'
+  name "Redmine Redirect After Create Plugin"
+  author "Intera GmbH"
+  description "This plugin redirects the user to a custom URL after ticket creation based on a URL parameter."
+  version "0.1.0"
+  url "https://github.com/Intera/redmine_redirect_after_create"
+  requires_redmine :version_or_higher => "6.0.0"
 end

lib/redmine_redirect_after_create/issues_controller_patch.rb

@@ -1,11 +1,11 @@
-= redmine_redirect_after_create
+# redmine_redirect_after_create
 
 This Redmine plugin allows to specify a custom redirect URL when a new issue is created.
 
-You can use it by appending the redirect_url parameter the the URL for creating a  new issue.
+You can use it by appending the redirect_url parameter the the URL for creating a new issue.
 
 For example:
 
-http://my-redmine-url.tld/projects/myprojects/issues/new?redirect_url=%2F
+http://my-redmine-url.tld/projects/myprojects/issues/new?redirect_url=/projects
 
-This URL will redirect the user to the homepage after the ticket was created.
+This URL will redirect the user to the projects overview after the ticket was created.