5 files changed, 47 insertions, 2 deletions
diff --git a/guides/source/5_0_release_notes.md b/guides/source/5_0_release_notes.md
index 2650384df3..6537b089a9 100644
--- a/guides/source/5_0_release_notes.md
+++ b/guides/source/5_0_release_notes.md
@@ -120,6 +120,9 @@ Please refer to the [Changelog][railties] for detailed changes.
     ([Pull Request](https://github.com/rails/rails/pull/22457),
      [Pull Request](https://github.com/rails/rails/pull/22288))
 
+*   Introduced an `after_bundle` callback for use in Rails plugin templates.
+    ([Pull Request](https://github.com/rails/rails/pull/))
+
 
 Action Pack
 -----------
diff --git a/railties/CHANGELOG.md b/railties/CHANGELOG.md
index 2c363c55da..91e879dd73 100644
--- a/railties/CHANGELOG.md
+++ b/railties/CHANGELOG.md
@@ -448,4 +448,11 @@
 
     *Alex Robbin*
 
+*   Add `after_bundle` callbacks in Rails plugin templates.  Useful for allowing
+    templates to perform actions that are dependent upon `bundle install`.
+
+    Fixes #<>
+
+    *Ryan Manuel*
+
 Please check [4-2-stable](https://github.com/rails/rails/blob/4-2-stable/railties/CHANGELOG.md) for previous changes.
diff --git a/railties/lib/rails/generators/rails/plugin/plugin_generator.rb b/railties/lib/rails/generators/rails/plugin/plugin_generator.rb
index 0c7a73a54e..b5e836b584 100644
--- a/railties/lib/rails/generators/rails/plugin/plugin_generator.rb
+++ b/railties/lib/rails/generators/rails/plugin/plugin_generator.rb
@@ -259,6 +259,12 @@ task default: :test
 
       public_task :apply_rails_template, :run_bundle
 
+      def run_after_bundle_callbacks
+        @after_bundle_callbacks.each do |callback|
+          callback.call
+        end
+      end
+
       def name
         @name ||= begin
           # same as ActiveSupport::Inflector#underscore except not replacing '-'
diff --git a/railties/test/generators/app_generator_test.rb b/railties/test/generators/app_generator_test.rb
index 136bdd1694..53f8ed6af0 100644
--- a/railties/test/generators/app_generator_test.rb
+++ b/railties/test/generators/app_generator_test.rb
@@ -703,9 +703,8 @@ class AppGeneratorTest < Rails::Generators::TestCase
     end
 
     sequence = ['install', 'exec spring binstub --all', 'echo ran after_bundle']
-    ensure_bundler_first = -> command do
       @sequence_step ||= 0
-
+    ensure_bundler_first = -> command do
       assert_equal sequence[@sequence_step], command, "commands should be called in sequence #{sequence}"
       @sequence_step += 1
     end
@@ -717,6 +716,8 @@ class AppGeneratorTest < Rails::Generators::TestCase
         end
       end
     end
+
+    assert_equal 3, @sequence_step
   end
 
   protected
diff --git a/railties/test/generators/plugin_generator_test.rb b/railties/test/generators/plugin_generator_test.rb
index 874bda17b7..ef33cd4ff7 100644
--- a/railties/test/generators/plugin_generator_test.rb
+++ b/railties/test/generators/plugin_generator_test.rb
@@ -634,6 +634,34 @@ class PluginGeneratorTest < Rails::Generators::TestCase
     assert_file "app/models/bukkits/article.rb", /class Article < ApplicationRecord/
   end
 
+  def test_after_bundle_callback
+    path = 'http://example.org/rails_template'
+    template = %{ after_bundle { run 'echo ran after_bundle' } }
+    template.instance_eval "def read; self; end" # Make the string respond to read
+
+    check_open = -> *args do
+      assert_equal [ path, 'Accept' => 'application/x-thor-template' ], args
+      template
+    end
+
+    sequence = ['install', 'echo ran after_bundle']
+    @sequence_step ||= 0
+    ensure_bundler_first = -> command do
+      assert_equal sequence[@sequence_step], command, "commands should be called in sequence #{sequence}"
+      @sequence_step += 1
+    end
+
+    generator([destination_root], template: path).stub(:open, check_open, template) do
+      generator.stub(:bundle_command, ensure_bundler_first) do
+        generator.stub(:run, ensure_bundler_first) do
+          quietly { generator.invoke_all }
+        end
+      end
+    end
+
+    assert_equal 2, @sequence_step
+  end
+
 protected
   def action(*args, &block)
     silence(:stdout){ generator.send(*args, &block) }