问题
I upgraded to 4.1.8 and now when I open a console session and do require "active_record" I get the following output:
[1] pry(main)> require 'active_record'
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::BASE
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_ALL
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_NaN
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_INFINITY
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_UNDERFLOW
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_OVERFLOW
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_ZERODIVIDE
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_MODE
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_UP
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_DOWN
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_HALF_UP
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_HALF_DOWN
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_CEILING
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_FLOOR
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_HALF_EVEN
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_NaN
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_POSITIVE_ZERO
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_NEGATIVE_ZERO
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_POSITIVE_FINITE
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_NEGATIVE_FINITE
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_POSITIVE_INFINITE
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_NEGATIVE_INFINITE
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::INFINITY
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::NAN
=> true
I've tried reinstalling Active Record 4.1.8 twice now, and both times I get the same issue. I also just tried reinstalling bigdecimal
gem uninstall bigdecimal
gem install bigdecimal
and that did not fix it. I have bigdecimal-1.2.5 installed currently.
来源：https://stackoverflow.com/questions/27557822/requiring-active-record-4-1-8-gives-warnings