异常日志

CSV: invalid byte sequence in UTF-8

解决前的代码:

rows = CSV.read file_path, col_sep: ';'
rows.each do |row|
  puts row.inspect
end

解决方法: 增加 encoding 选项

rows = CSV.read file_path, col_sep: ';', encoding: 'windows-1251:utf-8'

Rake Task: 同一个 task 跑了两次

解决前:

desc 'debug commission report'
task :og_one_report => [:environment] do
  do_something
  ...
end

$ bundle exe rake debug:og_one_report  # 日志显示 debug:og_one_report 跑了两次 

解决方法, 加一个 exit

desc 'debug commission report'
task :og_one_report => [:environment] do
  do_something
  ...
  exit
end

Date: undefined method `striftime’ for :Date

很明显方法拼错了, 应该是 strftime 而不是 striftime, 这导致了一个线上错误

a.next_date = (a.start_date.striftime('%Y-%m-') + a.active_date.to_s).to_date

修复后:

a.next_date = (a.start_date.strftime('%Y-%m-') + a.active_date.to_s).to_date

Constant: uninitialized constant AutomateCommissionService::OgOneRecord (NameError)

出问题的代码类似于,

class PBar
end

module Foo
  class A
  end

  class B
  end
end

class Bar < PBar

  def call
    begin
      2.times { puts A.new }
      puts B.new
    end
  end
  
end

Bar.new.call # 会丢出 uninitialized constant 的错误

修复方法: 在 Bar 内执行一个 include Foo 操作, 或者使用 Foo::A, Foo::B 来引用 A, B

class Bar < PBar
  include Foo

  def call
    begin
      2.times { puts A.new }
      puts B.new
    end
  end
  
end

通过 puts Bar.ancestors 可以打印出 Bar 的所有祖先，Bar 的祖先也包括了 Bar 自己,

# Bar.ancestors
Bar
Foo
PBar
Object
Kernel
BasicObject

Bar 首先在自己内部查询 A, B 两个常量，如果没有找到就到上一级祖先 Foo 中去查找，依次类推，如果在最顶级的 BasicObject 里仍然没有找到 A, B 两个常量，就会抛出 uninitialized constant 异常。

nil can’t be coerced into Float

问题解决前的代码大概如下:

module Report
  class SummaryRecord

    def sum_of_total_local
	  [
       sum_of_dualteam_local,
       sum_of_retail_local,
       sum_of_fasttrack_local
      ].reduce(:+)
	end
	
  end
end

module Report
  class ItalySummaryRecord < SummaryRecord
    attr_reader :sum_of_total_local

    def payment_rate
	  payment_after_tax / sum_of_total_local
	end
	
  end
end

Report::ItalySummaryRecord#payment_rate 执行时会抛出 nil can't be coerced into Float 的异常，原因是 sum_of_tatal_local 是 nil, 我本意需要 Report::ItalySummaryRecord#payment_rate 执行时会调用其父类 Report::SummaryRecord 的 payment_rate 方法, 某种原因我无法去掉 attr_reader :sum_of_total_local 这段代码，所以我需要在 Report::ItalySummaryRecord 中移除 sum_of_total_local 方法，要达到此目的可以使用 remove_method, 修复后的代码如下,

module Report

  class ItalySummaryRecord < SummaryRecord
    attr_reader :sum_of_total_local

    remove_method :sum_of_total_local

    def payment_rate
	  payment_after_tax / sum_of_total_local
	end
	
  end

end

invalid gem: package is corrupt, exception while verifying: undefined method `size’ for nil:NilClass

安装 rails-4.2.0 时报的一个错误，

 gem install rails -v 4.2.0

将 ~/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/cache/activesupport-4.2.0.gem 删除，重新安装就好了。

Capistrano, no such file to load – config/deploy

在生成服务器上部署, 执行:

$ cap deploy

出现错误:

cap aborted!
no such file to load -- config/deploy

解决方法:

$ bundle exe cap deploy