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如何在 Ruby 中获得随机数

ruby-on-rails ruby ruby-on-rails-3 ruby-on-rails-4 random

尝试安装 pg gem 时找不到'libpq-fe.h 标头

ruby-on-rails ruby-on-rails-3 postgresql rails-postgresql pg

尝试安装 pg gem 时找不到'libpq-fe.h 标头

ruby-on-rails ruby-on-rails-3 postgresql rails-postgresql pg

如何在 Ruby on Rails 迁移中重命名数据库列？

ruby-on-rails ruby-on-rails-3 migration