rake db：migrate給出'unexpected \\ n'錯誤

Question

我使用Rails scaffolding使用終端命令制作模型：

rails generate scaffold Venue venueid:string, venueName:string, venueAddress:string, venueCity:string, venueState:string, venueZip:integer, venuePhone:string, venueAge:int

一切似乎安裝或生成好，但當我運行rake db:migrate我收到以下錯誤：

rake aborted!
/Users/Banderson/Documents/demo/db/migrate/20130202222224_create_venues.rb:5: syntax error, unexpected '\n'

      t.string, :venueName
^
org/jruby/RubyKernel.java:1062:in `require'
/Users/Banderson/.rvm/gems/jruby-1.6.8/gems/activesupport-3.2.10/lib/active_support/dependencies.rb:251:in `require'
/Users/Banderson/.rvm/gems/jruby-1.6.8/gems/activesupport-3.2.10/lib/active_support/dependencies.rb:236:in `load_dependency'
/Users/Banderson/.rvm/gems/jruby-1.6.8/gems/activesupport-3.2.10/lib/active_support/dependencies.rb:251:in `require'
/Users/Banderson/Documents/demo/db/migrate/20130202222224_create_venues.rb:537:in `load_migration'
/Users/Banderson/.rvm/gems/jruby-1.6.8/gems/activerecord-3.2.10/lib/active_record/migration.rb:533:in `migration'
/Users/Banderson/.rvm/gems/jruby-1.6.8/gems/activerecord-3.2.10/lib/active_record/migration.rb:528:in `migrate'
/Users/Banderson/.rvm/gems/jruby-1.6.8/gems/activerecord-3.2.10/lib/active_record/migration.rb:720:in `migrate'
org/jruby/RubyProc.java:270:in `call'
org/jruby/RubyProc.java:220:in `call'
/Users/Banderson/.rvm/gems/jruby-1.6.8/gems/activerecord-3.2.10/lib/active_record/migration.rb:775:in `ddl_transaction'
/Users/Banderson/.rvm/gems/jruby-1.6.8/gems/activerecord-3.2.10/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction'
/Users/Banderson/.rvm/gems/jruby-1.6.8/gems/activerecord-3.2.10/lib/active_record/transactions.rb:208:in `transaction'
/Users/Banderson/.rvm/gems/jruby-1.6.8/gems/activerecord-3.2.10/lib/active_record/migration.rb:775:in `ddl_transaction'
/Users/Banderson/.rvm/gems/jruby-1.6.8/gems/activerecord-3.2.10/lib/active_record/migration.rb:719:in `migrate'
org/jruby/RubyArray.java:1620:in `each'
/Users/Banderson/.rvm/gems/jruby-1.6.8/gems/activerecord-3.2.10/lib/active_record/migration.rb:700:in `migrate'
/Users/Banderson/.rvm/gems/jruby-1.6.8/gems/activerecord-3.2.10/lib/active_record/migration.rb:570:in `up'
/Users/Banderson/.rvm/gems/jruby-1.6.8/gems/activerecord-3.2.10/lib/active_record/migration.rb:551:in `migrate'
/Users/Banderson/.rvm/gems/jruby-1.6.8/gems/activerecord-3.2.10/lib/active_record/railties/databases.rake:179:in `(root)'
org/jruby/RubyProc.java:270:in `call'
org/jruby/RubyProc.java:220:in `call'
org/jruby/RubyArray.java:1620:in `each'
org/jruby/RubyArray.java:1620:in `each'
org/jruby/RubyKernel.java:1087:in `load'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)

我做錯了什么，或者我該如何解決？

Answer 1

嘗試

rails generate scaffold Venue venueid:string venueName:string venueAddress:string venueCity:string venueState:string venueZip:integer venuePhone:string venueAge:int

代替。 你不應該在每個字段之間使用逗號。

使用逗號，您將在其中生成遷移：

create_table :venues do |t|
  t.string, :venueid
  t.string, :venueName
  t.string, :venueAddress
  t.string, :venueCity
  t.string, :venueState
  t.integer, :venueZip
  t.string, :venuePhone
  t.int :venueAge

  t.timestamps
end

如您所見，每個t.string / integer / etc. 方法調用在給出任何參數之前都有逗號，這是無效的。 如果這樣做：

puts, "hi"

我收到了錯誤

syntax error, unexpected '\n', expecting tCOLON2 or '[' or '.'

這類似於你的錯誤。

tldr：不要在生成器中使用逗號