hi, Fred
   Thank you very much!
   Now it works fine!
   Because ruby 1.9 does not use utf-8 as default encode:
   
   1.9.3-p551 :001 > __ENCODING__.name
   => "US-ASCII" 
 
  For UTF-8, I used the following commands:
    
   bash-3.2$ export LANG=en_US.UTF-8
   bash-3.2$ rails c
     Loading development environment (Rails 3.2.22)
    1.9.3-p551 :001 > __ENCODING__.name
    => "UTF-8" 

  After that, I get the right record when I run the previous query: 

 1.9.3-p551 :002 > ActivityObject.where(:title => '第一个纵纹')
 
 ActivityObject Load (29.5ms)  SELECT "activity_objects".* FROM 
"activity_objects" WHERE "activity_objects"."title" = '第一个纵纹'
 => [#<ActivityObject id: 648, created_at: "2015-06-21 14:41:19", 
updated_at: "2015-06-21 14:41:19", object_type: "Excursion", like_count: 0, 
title: "第一个纵纹", description: "整的行不?", follower_count: 1, visit_count: 5, 
language: "independent", age_min: 0, age_max: 0, notified_after_draft: 
false, comment_count: 0, popularity: 0, download_count: 0, qscore: 500000, 
reviewers_qscore: nil, users_qscore: nil, ranking: 0, title_length: 1, 
desc_length: 1, tags_length: 1, scope: 0, avatar_file_name: nil, 
avatar_content_type: nil, avatar_file_size: nil, avatar_updated_at: nil, 
teachers_qscore: nil>]


On Tuesday, June 23, 2015 at 8:13:13 PM UTC+8, Frederick Cheung wrote:
>
> On Tuesday, June 23, 2015 at 3:02:36 PM UTC+3, Dillon Peng wrote: 
>
> > Also, I can directly query this record using the Chinese string under 
> psql: 
> > vish_development=# select * from activity_objects where title = '第一个纵纹'; 
> > So my question is that what should I do for enabling CJK string in 
> ActiveRecord's where or like this? 
>
> I'm not aware of any rails setting that controls this, however there are a 
> few things that could come into play: 
>
> - what is the encoding of that string? Current versions of ruby default to 
> Utf-8, but I don't think 1.9 did 
> - what are postgres' collation / encoding settings ? This will affect how 
> strings are compared, which is super important in unicode, with different 
> normalisation forms and so on. 
>
> Fred

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