rake db:structure:dump 上 nil nilclass 的未定义方法“exitstatus”答案

【问题标题】：undefined method 'exitstatus' for nil nilclass on rake db:structure:dumprake db:structure:dump 上 nil nilclass 的未定义方法“exitstatus”
【发布时间】：2012-07-11 11:23:03
【问题描述】：

当我第一次尝试在 rails 中执行 rake db:structure:dump 时。我需要切换到 sql fromat。我明白了：（PostgreSQL 数据库）

C:\Sites\care>rake db:structure:dump --trace
Creating scope :search. Overwriting existing method PgSearch::Document.search.
** Invoke db:structure:dump (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:structure:dump
C:/RailsInstaller/Ruby1.9.3/bin/rake: No such file or directory - pg_dump -i -s -x -O -f C:/Sites/care/db/structure.sql  care_development
rake aborted!
undefined method `exitstatus' for nil:NilClass
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/railties/databases.rake:390:in `block (3 levels) in <top (required)>'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `block in execute'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block (2 levels) in top_level'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block in top_level'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `block in run'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>'
C:/RailsInstaller/Ruby1.9.3/bin/rake:19:in `load'
C:/RailsInstaller/Ruby1.9.3/bin/rake:19:in `<main>'
Tasks: TOP => db:structure:dump

知道可能是什么问题吗？

【问题讨论】：

标签： ruby-on-rails ruby-on-rails-3 postgresql rake

【解决方案1】：

将 pg_dump 添加到 PATH 就可以了。

【讨论】：

感谢它解决它的答案。我现在如何得到：权限被拒绝 - pg_dump -i -s -x -O -f C:/Sites/care/db/structure.sql care_development 我尝试在 Windows 中更改文件夹的权限。但似乎没有帮助。
您是否更改了 pg_dump.exe 文件的权限？