fix broken `gem` method with non-String arguments. Closes #16709.

This was caused by #15327.

3 files changed, 23 insertions, 4 deletions

diff --git a/railties/CHANGELOG.md b/railties/CHANGELOG.md
index 2a09ccf61a..038fe9df5f 100644
--- a/railties/CHANGELOG.md
+++ b/railties/CHANGELOG.md
@@ -1,3 +1,10 @@
+*   Fix a bug in the `gem` method for Rails templates when non-String options
+    are used.
+
+    Fixes #16709.
+
+    *Yves Senn*
+
 *   The [web-console](https://github.com/rails/web-console) gem is now
     installed by default for new applications. It can help you debug
     development exceptions by spawnig an interactive console in its cause
diff --git a/railties/lib/rails/generators/actions.rb b/railties/lib/rails/generators/actions.rb
index 4709914947..b2c9d12996 100644
--- a/railties/lib/rails/generators/actions.rb
+++ b/railties/lib/rails/generators/actions.rb
@@ -268,11 +268,13 @@ module Rails
 
         # Surround string with single quotes if there is no quotes.
         # Otherwise fall back to double quotes
-        def quote(str)
-          if str.include?("'")
-            str.inspect
+        def quote(value)
+          return value.inspect unless value.is_a? String
+
+          if value.include?("'")
+            value.inspect
           else
-            "'#{str}'"
+            "'#{value}'"
           end
         end
     end
diff --git a/railties/test/generators/actions_test.rb b/railties/test/generators/actions_test.rb
index a4337926d1..2206e389b5 100644
--- a/railties/test/generators/actions_test.rb
+++ b/railties/test/generators/actions_test.rb
@@ -79,6 +79,16 @@ class ActionsTest < Rails::Generators::TestCase
     assert_file 'Gemfile', /gem 'rspec', github: 'dchelimsky\/rspec', tag: '1\.2\.9\.rc1'/
   end
 
+  def test_gem_with_non_string_options
+    run_generator
+
+    action :gem, 'rspec', require: false
+    action :gem, 'rspec-rails', group: [:development, :test]
+
+    assert_file 'Gemfile', /^gem 'rspec', require: false$/
+    assert_file 'Gemfile', /^gem 'rspec-rails', group: \[:development, :test\]$/
+  end
+
   def test_gem_falls_back_to_inspect_if_string_contains_single_quote
     run_generator