How to enable ActiveRecord to support CJK query?

Rails
1

I ask a question in stackoverflow:
ruby on rails - How to enable ActiveRecord to support CJK query? - Stack Overflow, There is no answer!

After runing rails console, I can execute the following query:

1.9.3-p551 :001 > ActivityObject.where(:title => “kiketurpis integer
aliquet”)
And I got a unique answer existed in database. But if I enter:

1.9.3-p551 :002 > ActivityObject.where(:title => ‘第一个纵纹’)

(In double quotes there is a Chinese string.) I got all records in table
activity_objects, which means I can not use Chinese string in predicate
where.

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?

2

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

3

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>]