只要数据库是干净的，没有表，这在测试和设置要部署的新服务器时经常发生，许多 rake 任务，如 assets:precompile，会失败并出现此错误:
rake aborted!
PG::Error: ERROR: relation "users" does not exist
LINE 4: WHERE a.attrelid = '"users"'::regclass
^
: SELECT a.attname, format_type(a.atttypid, a.atttypmod), d.adsrc, a.attnotnull
FROM pg_attribute a LEFT JOIN pg_attrdef d
ON a.attrelid = d.adrelid AND a.attnum = d.adnum
WHERE a.attrelid = '"users"'::regclass
AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum
关于为什么以及如何解决它的任何想法？
如果我使用 trace 运行它，我可以看到错误是从 staffer.rb:103 生成的，其中包含:
scope :visible, where(:deleted => false)
如果我将其注释掉，至少 assets:precompile 有效。
似乎整个事情都是由 active_admin 触发的，admin/users.rb 的第一行看起来像:
# encoding: UTF-8
#
ActiveAdmin.register User do
menu :priority => 2
filter :id
filter :rid
filter :tenant
filter :type, :as => :check_boxes, :collection => %w{Manager Staffer}
filter :state, :as => :check_boxes, :collection => Staffer::STATES
filter :email
filter :first_name
filter :last_name
整个错误如下所示:
1.9.3-p194@projectx root@b1:/var/nginx/projectx/releases/20120710151049# bundle exec rake RAILS_ENV=staging RAILS_GROUPS=assets assets:precompile --trace
** Invoke assets:precompile (first_time)
** Execute assets:precompile
** Invoke assets:precompile:all (first_time)
** Execute assets:precompile:all
** Invoke assets:precompile:primary (first_time)
** Invoke assets:environment (first_time)
** Execute assets:environment
** Invoke environment (first_time)
** Execute environment
Resolved collector.newrelic.com to 204.93.223.153
rake aborted!
PG::Error: ERROR: relation "users" does not exist
LINE 4: WHERE a.attrelid = '"users"'::regclass
^
: SELECT a.attname, format_type(a.atttypid, a.atttypmod), d.adsrc, a.attnotnull
FROM pg_attribute a LEFT JOIN pg_attrdef d
ON a.attrelid = d.adrelid AND a.attnum = d.adnum
WHERE a.attrelid = '"users"'::regclass
AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum
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/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/activerecord-3.2.6/lib/active_record/querying.rb:9:in `where'
/var/nginx/projectx/releases/20120710151049/app/models/staffer.rb:103:in `<class:Staffer>'
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/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/actionpack-3.2.6/lib/action_dispatch/routing/mapper.rb:749:in `block in constraints'
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/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/actionpack-3.2.6/lib/action_dispatch/routing/mapper.rb:749:in `constraints'
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/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/railties-3.2.6/lib/rails/application/routes_reloader.rb:40:in `load_paths'
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/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/railties-3.2.6/lib/rails/application.rb:108:in `reload_routes!'
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/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `block in execute'
/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each'
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/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke'
/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/actionpack-3.2.6/lib/sprockets/assets.rake:60:in `block (3 levels) in <top (required)>'
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/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each'
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/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each'
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/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task'
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/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
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/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
/var/nginx/projectx/shared/bundle/ruby/1.9.1/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>'
/var/nginx/projectx/shared/bundle/ruby/1.9.1/bin/rake:23:in `load'
/var/nginx/projectx/shared/bundle/ruby/1.9.1/bin/rake:23:in `<main>'
Tasks: TOP => environment
最佳答案
使用带有 where 子句的 scope 将导致 ActiveRecord 尝试加载表的列和其他信息，以便它可以预构建 ActiveRelation。一个简单的解决方案是将 where 部分包装在 Proc 中，或者(我最喜欢的)不使用作用域而是使用类方法。这做同样的事情，随着你的范围变得越来越复杂，你会发现它比使用 scope 更干净。
def self.visible
where(:deleted => false)
end
关于ruby-on-rails - 运行抽佣 Assets :precompile fails when there's no tables (yet)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11416626/