在设置Devise时迁移时获取’undefined method`to_sym’

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但是我的Migrations are pending; run 'bin/rake db:migrate RAILS_ENV=development' to resolve this issue. Migrations are pending; run 'bin/rake db:migrate RAILS_ENV=development' to resolve this issue. 在我的浏览器中。

无论如何，键入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

结束

我尝试使用gem composite-primary-keys解决这个问题，但发现rails 4.0.2没有兼容版本。

作为一个绝对的菜鸟，我在这里找到了问题： https ： //github.com/composite-primary-keys/composite_primary_keys/issues/174但它并没有帮助我。

谢谢！

//编辑

多数民众赞成我的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

最后没有额外的逗号……

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