flynn1982

def autovivifying_hash
   Hash.new {|ht,k| ht[k] = autovivifying_hash}
end

hash = autovivifying_hash
hash['a']['b']['c']['d']['e'] = 'hello'

puts hash['c']
puts hash['a']
puts hash['b']

flynn1982

def uri?(string)
  uri = URI.parse(string)
  %w( http https ).include?(uri.scheme)
rescue URI::BadURIError
  false
rescue URI::InvalidURIError
  false
end

See https://stackoverflow.com/questions/5331014/check-if-given-string-is-an-url

flynn1982

Some Model Name
  ...
  
  # scopes
  scope :by_category, ->(category) { where(category: category) if category.present? }
  scope :by_project_id, ->(id) { where(project_id: id ) }

  ...
  
  # class methods

flynn1982

class CoolFileGenerator < Rails::Generators::Base
  def set_file_name
    @file_name = "cool_file.rb"
  end

  def create_cool_file
    body = ask "What should I write into the file?"
    create_file @file_name, "Insert after me \n" + body
  end