当我执行上面的命令时，我在终端中收到此错误，
Deans-MacBook:depot dean$ rake db:create RAILS_ENV='development'
(in /Users/dean/src/RailsBook/depot) Couldn't create database for {"username"=>"root", "adapter"=>"mysql", "database"=>"depot_development", "host"=>"localhost", "password"=>nil}, charset: utf8, collation: utf8_unicode_ci (if you set the charset manually, make sure you have a matching collation)
在数据库配置文件中，我有以下内容：
development:
adapter: mysql
database: depot_development
username: root
password:
host: localhost
我安装了mysql gem，现在我不确定下一步该怎么做。我在Macbook上运行雪豹。有谁知道为什么会发生这种错误？
在此先感谢您
院长
编辑
在评论中执行了命令并得到以下内容：
Deans-MacBook:depot dean$ rake -t db:create RAILS_ENV='development'
(in /Users/dean/src/RailsBook/depot)
** Invoke db:create (first_time)
** Invoke db:load_config (first_time)
** Invoke rails_env (first_time)
** Execute rails_env
** Execute db:load_config
** Execute db:create
Couldn't create database for {"username"=>"root", "adapter"=>"mysql", "database"=>"depot_development", "host"=>"localhost", "password"=>nil}, charset: utf8, collation: utf8_unicode_ci (if you set the charset manually, make sure you have a matching collation)
编辑2 我已经卸载了mysql gem并重新安装它，我注意到这里发生了一个错误：
Deans-MacBook:~ dean$ sudo gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config
Building native extensions. This could take a while...
Successfully installed mysql-2.8.1
1 gem installed
Installing ri documentation for mysql-2.8.1...
No definition for next_result
No definition for field_name
No definition for field_table
No definition for field_def
No definition for field_type
No definition for field_length
No definition for field_max_length
No definition for field_flags
No definition for field_decimals
No definition for time_inspect
No definition for time_to_s
No definition for time_get_year
No definition for time_get_month
No definition for time_get_day
No definition for time_get_hour
No definition for time_get_minute
No definition for time_get_second
No definition for time_get_neg
No definition for time_get_second_part
No definition for time_set_year
No definition for time_set_month
No definition for time_set_day
No definition for time_set_hour
No definition for time_set_minute
No definition for time_set_second
No definition for time_set_neg
No definition for time_set_second_part
No definition for time_equal
No definition for error_errno
No definition for error_sqlstate
Installing RDoc documentation for mysql-2.8.1...
No definition for next_result
No definition for field_name
No definition for field_table
No definition for field_def
No definition for field_type
No definition for field_length
No definition for field_max_length
No definition for field_flags
No definition for field_decimals
No definition for time_inspect
No definition for time_to_s
No definition for time_get_year
No definition for time_get_month
No definition for time_get_day
No definition for time_get_hour
No definition for time_get_minute
No definition for time_get_second
No definition for time_get_neg
No definition for time_get_second_part
No definition for time_set_year
No definition for time_set_month
No definition for time_set_day
No definition for time_set_hour
No definition for time_set_minute
No definition for time_set_second
No definition for time_set_neg
No definition for time_set_second_part
No definition for time_equal
No definition for error_errno
No definition for error_sqlstate
我希望这会有所帮助。
答案 0 :(得分：1)
解决方案升级到64位版本的mysql。
答案 1 :(得分：0)
狂野猜测 - 您的Mysql实例上没有配置密码？您是否尝试从config / database.yml中删除password行？
答案 2 :(得分：0)
使用以下命令重新安装mysql-server和mysql-client：
sudo apt-get install mysql-server mysql-client
然后这里有一些库需要安装以使MySQL可用于ruby：
sudo apt-get install libmysql-ruby
这一切都解决了我的问题。试试吧 ！！！ ：）