耙任務為散列拋出錯誤分配默認值

Question

我在User模型中有一個序列化的屬性首選項，如下所示：

user.preferences
=> 
 @allow_fans=true,
 @approvals={:email=>true, :message=>false},
 @comment_on_an_item={:email=>false, :message=>true},
 @community_invitations={:email=>true, :message=>true},
 @community_requests={:email=>true, :message=>true},
 @flags={:email=>true, :message=>true},
 @follows={:email=>false, :message=>true},
 @likes_and_shares={:email=>false, :message=>true},
 @make_my_email_visible=true,
 @trackbacks_pingbacks={:email=>true, :message=>false}>

我寫了一個rake任務，將默認的首選項哈希分配給現有用戶，如下所示

namespace :user_preferences do
  desc "set default preferences for existing users"
  task :pref_defaults => :environment do
    default = {:comment_on_an_item => {'email' => nil, 'message' => true},
      :likes_and_shares => {'email' => nil, 'message' => true},
      :flags => {'email' => true, 'message' => true},
      :trackbacks_pingbacks => {'email' => true, 'message' => nil},
      :community_invitations => {'email' => true, 'message' => true},
      :approvals => {'email' => nil, 'message' => true},
      :community_requests => {'email' => true, 'message' => true},
      :follows => {'email' => nil, 'message' => true}}

    User.update_all(:preferences => default)
  end
end

但是當我運行rake任務rake user_preferences:pref_defaults ，出現錯誤

** Invoke user_preferences:pref_defaults (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute user_preferences:pref_defaults
rake aborted!
PG::Error: ERROR:  syntax error at or near "'---
- :likes_and_shares
- email: 
  message: true
'"
LINE 5: ','---
          ^
: UPDATE "users" SET "preferences" = '---
- :comment_on_an_item
- email: 
  message: true
','---
- :likes_and_shares
- email: 
  message: true
','---
- :flags
- email: true
  message: true
','---
- :trackbacks_pingbacks
- email: true
  message: 
','---
- :community_invitations
- email: true
  message: true
','---
- :approvals
- email: 
  message: true
','---
- :community_requests
- email: true
  message: true
','---
- :follows
- email: 
  message: true
'

請幫助我解決此錯誤。

Answer 1

在此處查看評論： http : //apidock.com/rails/ActiveRecord/Base/update_all/class

如果使用update_all更改標記為序列化的屬性（使用ActiveRecord :: Base.serialize），則需要自己調用to_yaml ：

User.update_all({ :preferences => { :first_name => ‘John’, :last_name  => 'Doe' }.to_yaml })