使用devise config变量自定义锁定错误消息

，可以通过以下步骤实现：

首先，确保你已经在Rails应用中安装并配置了Devise gem。如果还没有安装，可以在Gemfile中添加以下行并运行bundle install来安装Devise：

gem 'devise'

在终端中运行以下命令来生成Devise的配置文件：

rails generate devise:install

打开生成的config/initializers/devise.rb文件，找到以下代码块：

# ==> Configuration for :lockable
# Defines which strategy will be used to lock an account.
# :failed_attempts = Locks an account after a number of failed attempts to sign in.
# :none            = No lock strategy. You should handle locking by yourself.
config.lock_strategy = :failed_attempts

# Defines which strategy will be used to unlock an account.
# :email = Sends an unlock link to the user email
# :time  = Re-enables login after a certain amount of time (see :unlock_in below)
# :both  = Enables both strategies
# :none  = No unlock strategy. You should handle unlocking by yourself.
config.unlock_strategy = :both

# Number of authentication tries before locking an account if lock_strategy
# is failed attempts.
config.maximum_attempts = 20

# Time interval to unlock the account if :time is enabled as unlock_strategy.
config.unlock_in = 1.hour

在上述代码块中，可以看到config.lock_strategy和config.unlock_strategy两个配置项。你可以根据自己的需求选择合适的策略。例如，如果你想使用failed_attempts策略来锁定账户，可以将config.lock_strategy的值设置为:failed_attempts。
如果你想自定义锁定错误消息，可以在同一个配置文件中找到以下代码块：

# ==> Configuration for :lockable
# Defines lock strategy to use.
# :failed_attempts = Locks an account after a number of failed attempts to sign in.
# :none            = No lock strategy. You should handle locking by yourself.
config.lock_strategy = :failed_attempts

# Defines unlock strategy to use.
# :email = Sends an unlock link to the user email
# :time  = Re-enables login after a certain amount of time (see :unlock_in below)
# :both  = Enables both strategies
# :none  = No unlock strategy. You should handle unlocking by yourself.
config.unlock_strategy = :both

# Number of authentication tries before locking an account if lock_strategy
# is failed attempts.
config.maximum_attempts = 20

# Time interval to unlock the account if :time is enabled as unlock_strategy.
config.unlock_in = 1.hour

# Defines which key will be used when locking and unlocking an account
config.locked_at = :failed_attempts

在上述代码块中，可以看到config.locked_at配置项。你可以将其设置为一个自定义的错误消息。例如，如果你想将锁定错误消息设置为"你的账户已被锁定，请联系管理员解锁。"，可以将config.locked_at的值设置为"你的账户已被锁定，请联系管理员解锁。"。
保存并关闭config/initializers/devise.rb文件。

通过以上步骤，你可以使用Devise的config变量自定义锁定错误消息。请注意，这只是Devise的一小部分功能，Devise还提供了许多其他功能和配置选项，可以根据你的需求进行进一步的定制和配置。

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