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Wiki diffs: incompatible character encoding error on Ruby 1.9.2 (Bug #707)

Added by Moritz Breit at 2011-11-16 04:38 pm. Updated at 2011-11-25 05:49 pm.

Status:Closed Start date:2011-11-16
Priority:Normal Due date:
Assignee:- % Done:


Target version:2.5.0
Remote issue URL: Affected version:2.4.0


On Ruby 1.9.2, showing wiki diffs can fail with an incompatible character encoding error:

ActionView::TemplateError (incompatible character encodings: UTF-8 and ASCII-8BIT) on line #16 of app/views/wiki/diff.rhtml:
13: </p>
15: <div class="text-diff">
16: <%= simple_format_without_paragraph @diff.to_html %>
17: </div>

    app/views/wiki/diff.rhtml:16:in `concat'
    app/views/wiki/diff.rhtml:16:in `_run_rhtml_app47views47wiki47diff46rhtml'
    <internal:prelude>:10:in `synchronize'
    /home/mbreit/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
    /home/mbreit/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
    /home/mbreit/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'

Rendered rescues/_trace (13.9ms)
Rendered rescues/_request_and_response (3.4ms)
Rendering rescues/layout (internal_server_error)

This happens if the WikiJournal content is gzip encoded.
The reason is source:app/models/wiki_content.rb@0462fa9#L107 where Zlib::Inflate.inflate returns a string with encoding set to ASCII-8BIT.

Associated revisions

Revision 60db8684
Added by Moritz Breit at 2011-11-16 05:39 pm

[#707] Fix encoding error on wiki diffs on Ruby 1.9

WikiDiff#to_html returns a string with ASCII encoding if
the WikiJournal content has been Zlib compressed because
Zlib::Inflate.inflate returns strings with ASCII encoding.
Forcing the encoding to be UTF8 fixes this bug.

Revision 8b7ee93f
Added by Felix Schäfer at 2011-11-25 06:48 pm

Merge pull request #124 from mbreit/bugfix/707-wiki-diff-encoding-error-ruby19

[#707] Fix encoding error on wiki diffs on Ruby 1.9


Updated by Moritz Breit at 2011-11-16 04:43 pm

A pull request with a fix for this problem is at

Updated by Felix Schäfer at 2011-11-16 07:14 pm

Looks good to me, I'd just like Holger to have a quick look too. The only thing I'm not quite sure about is the respond_to part, wouldn't it be better to test whether we're on 1.9 or not?

  • Target version set to 2.5.0
  • Status changed from Open to Ready for review

Updated by Holger Just at 2011-11-16 07:35 pm

This is fine by me. The respond_to? is best practice and better transports the intend of the action.

As a side remark, I'd like to state that the whole gzip-bytes-in-text-field thing that we pull is rather shady. Those things should either be stored in a BLOB or (even better) be left to the underlying database storage engine to be transparently compressed. However, this is out of scope for this issue.

Updated by Felix Schäfer at 2011-11-25 05:49 pm

Merged in 8b7ee93, thanks a lot!

  • Status changed from Ready for review to Closed

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