Ruby on rails rakedb:seed不返回nil到字符串的隐式转换
当运行Ruby on rails rakedb:seed不返回nil到字符串的隐式转换,ruby-on-rails,ruby,sqlite,gem,rake,Ruby On Rails,Ruby,Sqlite,Gem,Rake,当运行rake db:seed以放入测试用户时，我得到以下错误： ROLES rake aborted! no implicit conversion of nil into String /Users/joshburns/Code/file-server/db/seeds.rb:10:in `<top (required)>' /Users/joshburns/.rvm/gems/ruby-2.1.0@file-server/gems/activesupport-4.0.3/lib
rake db:seedROLES
rake aborted!
no implicit conversion of nil into String
/Users/joshburns/Code/file-server/db/seeds.rb:10:in `<top (required)>'
/Users/joshburns/.rvm/gems/ruby-2.1.0@file-server/gems/activesupport-4.0.3/lib/active_support/dependencies.rb:223:in `load'
/Users/joshburns/.rvm/gems/ruby-2.1.0@file-server/gems/activesupport-4.0.3/lib/active_support/dependencies.rb:223:in `block in load'
/Users/joshburns/.rvm/gems/ruby-2.1.0@file-server/gems/activesupport-4.0.3/lib/active_support/dependencies.rb:214:in `load_dependency'
/Users/joshburns/.rvm/gems/ruby-2.1.0@file-server/gems/activesupport-4.0.3/lib/active_support/dependencies.rb:223:in `load'
/Users/joshburns/.rvm/gems/ruby-2.1.0@file-server/gems/railties-4.0.3/lib/rails/engine.rb:540:in `load_seed'
/Users/joshburns/.rvm/gems/ruby-2.1.0@file-server/gems/activerecord-4.0.3/lib/active_record/tasks/database_tasks.rb:154:in `load_seed'
/Users/joshburns/.rvm/gems/ruby-2.1.0@file-server/gems/activerecord-4.0.3/lib/active_record/railties/databases.rake:181:in `block (2 levels) in <top (required)>'
Tasks: TOP => db:seed
(See full trace by running task with --trace)
角色
雷克流产了！
没有将nil隐式转换为字符串
/Users/joshburns/Code/fileserver/db/seeds.rb:10:in`'
/Users/joshburns/.rvm/gems/ruby-2.1。0@file-server/gems/activesupport-4.0.3/lib/active\u-support/dependencies.rb:223:in'load'
/Users/joshburns/.rvm/gems/ruby-2.1。0@file-server/gems/activesupport-4.0.3/lib/active\u support/dependencies.rb:223:in'block in load'
/Users/joshburns/.rvm/gems/ruby-2.1。0@file-server/gems/activesupport-4.0.3/lib/active\u-support/dependencies.rb:214:in'load\u-dependency'
/Users/joshburns/.rvm/gems/ruby-2.1。0@file-server/gems/activesupport-4.0.3/lib/active\u-support/dependencies.rb:223:in'load'
/Users/joshburns/.rvm/gems/ruby-2.1。0@file-server/gems/railties-4.0.3/lib/rails/engine.rb:540:in'load_seed'
/Users/joshburns/.rvm/gems/ruby-2.1。0@file-server/gems/activerecord-4.0.3/lib/active_record/tasks/database_tasks.rb:154:in'load_seed'
/Users/joshburns/.rvm/gems/ruby-2.1。0@file-服务器/gems/activerecord-4.0.3/lib/active_record/railties/databases.rake:181:in'block（2层）in'
任务：TOP=>db:seed
（通过使用--trace运行任务查看完整跟踪）
puts 'ROLES'
YAML.load(ENV['ROLES']).each do |role|
Role.find_or_create_by_name(role)
puts 'role: ' << role
end
puts 'DEFAULT USERS'
user = User.find_or_create_by_email :name => ENV['ADMIN_NAME'].dup, :email => ENV['ADMIN_EMAIL'].dup, :password => ENV['ADMIN_PASSWORD'].dup, :password_confirmation => ENV['ADMIN_PASSWORD'].dup
puts 'user: ' << user.name
user.add_role :admin
放置“角色”
YAML.load（环境['ROLES']）。每个do | role|
角色。按名称查找或创建（角色）
放置'role:'ENV['ADMIN\u NAME'].dup，：email=>ENV['ADMIN\u email'].dup，：password=>ENV['ADMIN\u password'].dup，：password\u confirmation=>ENV['ADMIN\u password'].dup
放置“user:”如果这是seeds.db文件，为什么要输出字符串
puts 'ROLES'
puts 'DEFAULT USERS'
puts 'user: ' << user.name
如果希望使seeds.rb文件可读，应使用注释将其拆分dup用于什么？你能给我看一下add_角色的代码吗
YAML.load(ENV['ROLES']).each do |role|
Role.find_or_create_by_name(role)
puts 'role: ' << role
end
user = User.find_or_create_by_email :name => ENV['ADMIN_NAME'], :email => ENV['ADMIN_EMAIL'], :password => ENV['ADMIN_PASSWORD'], :password_confirmation => ENV['ADMIN_PASSWORD']
user.add_role :admin #-> need to see your method