rake db:迁移不使用回形针

我正在使用回形针,我正在尝试重新整理我的迁移文件,但我遇到了一个错误:

SyntaxError: /Users/Brendon/Desktop/savings/app/models/user.rb:5: syntax error, unexpected '{', expecting keyword_end
...attached_file :image, :styles { large: '600x600>', medium: '...
...                               ^
/Users/Brendon/Desktop/savings/app/models/user.rb:5: syntax error, unexpected ',', expecting keyword_end
...e, :styles { large: '600x600>', medium: '300x300>', thumb: '...
...                               ^
/Users/Brendon/Desktop/savings/app/models/user.rb:5: syntax error, unexpected ',', expecting keyword_end
...'600x600>', medium: '300x300>', thumb: '150x150#' }

我不知道这是怎么回事,我的耙。没有意外的“{”

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable

  has_attached_file :image, :styles { large: '600x600>', medium: '300x300>', thumb: '150x150#' }
  validates_attachment_content_type :image, content_type: /\Aimage\/.*\Z/

  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
end