Rails 4简单迁移Postgres上的错误

Question

不是我发现的第一个Rails 4迁移bug，如果确实是一个bug。

我想不通为什么这个极其简单的迁移将无法正常工作：

class AddAdminToUsers < ActiveRecord::Migration 
    def change 
    add_column :users, :admin, :boolean, { default: false, null: false } 
    end 
end 

我已经使用和不使用大括号试了一下。这是错误：

== AddAdminToUsers：migrating ==================================== ============ - add_column（：users，：admin，：boolean，{：default => false，：null => false}） rake aborted！ 发生错误，这和所有后来迁移取消：

wrong number of arguments (2 for 1)/Users/me/.rvm/gems/ruby-2.0.0-p353@myapp/gems/rails_best_practices-1.15.0/lib/rails_best_practices/core_ext/object.rb:7:in `try' 
/Users/me/.rvm/gems/ruby-2.0.0-p353@myapp/gems/activerecord-4.0.2/lib/active_record/connection_adapters/postgresql_adapter.rb:723:in `translate_exception' 
/Users/me/.rvm/gems/ruby-2.0.0-p353@myapp/gems/activerecord-4.0.2/lib/active_record/connection_adapters/abstract_adapter.rb:439:in `rescue in log' 
/Users/me/.rvm/gems/ruby-2.0.0-p353@myapp/gems/activerecord-4.0.2/lib/active_record/connection_adapters/abstract_adapter.rb:435:in `log' 
/Users/me/.rvm/gems/ruby-2.0.0-p353@myapp/gems/activerecord-4.0.2/lib/active_record/connection_adapters/postgresql/database_statements.rb:127:in `execute' 

的documentation是很清楚，这是可以的：

add_column(table_name, column_name, type, options): 
    Adds a new column to the table called table_name named 
    column_name specified to be one of the following types: 
    :string, :text, :integer, :float, :decimal, :datetime, 
    :timestamp, :time, :date, :binary, :boolean. 
A default value can be specified by passing an options 
    hash like { default: 11 }. 
Other options include :limit and :null (e.g. { limit: 50, null: false }) 

而且，为什么是rails-best-practices宝石抱怨？我没有援引它。

Answer 1

这似乎是rails_best_practices宝石中的一个错误。当我卸载该宝石时，代码正常工作。我会通知宝石维护者。