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我正在尝试设置 Pageflow。最后我设法创建了数据库并安装了页面流。我可以运行rails s，但我进入Migrations are pending; run 'bin/rake db:migrate RAILS_ENV=development' to resolve this issue.了我的浏览器。

无论如何，打字bundle exec rake db:create db:migrate会给我这个错误：

==  AddDeviseToUsers: migrating ===============================================
-- change_table(:users)
rake aborted!
StandardError: An error has occurred, all later migrations canceled:

undefined method `to_sym' for {:null=>false, :default=>""}:Hash/Users/user/.gem/gems/activerecord-4.0.2/lib/active_record/connection_adapters/abstract/schema_statements.rb:671:in `type_to_sql'

schema_statements 中的这一行说。

 def type_to_sql(type, limit = nil, precision = nil, scale = nil) #:nodoc:
    if native = native_database_types[type.to_sym]
      column_type_sql = (native.is_a?(Hash) ? native[:name] : native).dup

  if type == :decimal # ignore limit, use precision and scale
    scale ||= native[:scale]

    if precision ||= native[:precision]
      if scale
        column_type_sql << "(#{precision},#{scale})"
      else
        column_type_sql << "(#{precision})"
      end
    elsif scale
      raise ArgumentError, "Error adding decimal column: precision cannot be empty if scale is specified"
    end

  elsif (type != :primary_key) && (limit ||= native.is_a?(Hash) && native[:limit])
    column_type_sql << "(#{limit})"
  end

  column_type_sql
else
  type
end

结尾

我尝试使用 gem 复合主键来解决这个问题，但发现 rails 4.0.2 没有兼容的版本。

作为一个绝对菜鸟，我在这里发现了问题：https ://github.com/composite-primary-keys/composite_primary_keys/issues/174但它并没有帮助我。

谢谢！

//编辑

那是我的user.rb：

    class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable,
  # :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, 
         :recoverable, :rememberable, :trackable, :validatable
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, 
         :recoverable, :rememberable, :trackable, :validatable

  include Pageflow::UserMixin
end

最后没有多余的逗号...

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