Merge pull request #1182 from rails/use-inject_into_file

Use inject_into_file to support rails 4.2

Author: guilleiguaran

lib/install/template.rb

@@ -17,14 +17,10 @@
 run "bundle binstubs webpacker"
 
 say "Adding configurations"
-environment <<CONFIG, env: :development
-  # Verifies that versions and hashed value of the package contents in the project's package.json
-  config.webpacker.check_yarn_integrity = true
-CONFIG
-environment <<CONFIG, env: :production
-  # Verifies that versions and hashed value of the package contents in the project's package.json
-  config.webpacker.check_yarn_integrity = false
-CONFIG
+
+# Verifies that versions and hashed value of the package contents in the project's package.json
+inject_into_file "config/environments/development.rb", "    config.webpacker.check_yarn_integrity = true", after: "Rails.application.configure do\n", verbose: false
+inject_into_file "config/environments/production.rb", "   config.webpacker.check_yarn_integrity = false", after: "Rails.application.configure do\n", verbose: false
 
 if File.exists?(".gitignore")
   append_to_file ".gitignore", <<-EOS