Meaning of "Expected string default value for ..." on Ruby on Rails

Question

Recently I've created an app for Ruby (2.3.3) on Rails (5.0.0.1):

$ rails _5.0.0.1_ new myapp --database=postgresql -T 

After setting up the Gemfile and testing the connectivity to my databases:

$ rails db:migrate 

I've tried to generate models but I got strange messages:

$ rails g model Competition title:string Expected string default value for '--test-framework'; got false (boolean) Expected string default value for '--jbuilder'; got true (boolean) Expected string default value for '--test-framework'; got false (boolean)       invoke  active_record       create    db/migrate/20161206021603_create_competitions.rb       create    app/models/competition.rb 

What's the meaning of these messages about "Expected string default value for ..."?

Thanks in advance.

UPDATE: My Gemfile

source 'https://rubygems.org'  ruby '2.3.3'  gem 'rails', '~> 5.0.0', '>= 5.0.0.1' gem 'pg', '~> 0.18' gem 'puma', '~> 3.0' gem 'sass-rails', '~> 5.0' gem 'uglifier', '>= 1.3.0' gem 'coffee-rails', '~> 4.2' gem 'jquery-rails' gem 'turbolinks', '~> 5' gem 'jbuilder', '~> 2.5'  gem 'jquery-turbolinks' gem 'groupdate' gem 'hightop' gem 'countries' gem 'faker' gem 'haml' gem 'haml-rails'  group :development, :test do     gem 'byebug', platform: :mri     gem 'better_errors'     gem 'binding_of_caller'     gem 'pry-byebug'     gem 'awesome_print'     gem 'irbtools-more', require: 'irbtools/binding'     gem 'listen' end 

Answer 1

This happened to me with Rails 5.0.0.1 and ruby 2.2.0 when I performed a bundle update. It has nothing to do with either Rails or Ruby, but was instead caused by the upgrade of the thor gem (which is a dependency of jquery-rails, among others) from 0.19.1 to 0.19.4.

Downgrading to 0.19.3 didn't fix it. 0.19.2 threw other errors. Downgrading to 0.19.1 finally fixed it.

So adding this to your Gemfile:

gem 'thor', '0.19.1' 

and running bundle update thor should get rid of this until the thor maintainers can address this. (Update: Github issue)