This is a problem of Webrick.
you can use &quot;Thin&quot; instead.

Add this to Gemfile


    gem &#39;thin&#39;


then `rails s` will use thin instead of Webrick, and the warn will disappear.






Patch mentioned by Amiel Martin works for me! Just find your webrick path (ex., **c:\Ruby\lib\ruby\1.9.1\webrick**\  on Windows) and change **httpresponse.rb** file as described in [https://bugs.ruby-lang.org/attachments/2300/204_304_keep_alive.patch][1]

And don&#39;t forget restart Webrick!

  [1]: https://bugs.ruby-lang.org/attachments/2300/204_304_keep_alive.patch

This patch for WEBrick is also reported to work:

https://bugs.ruby-lang.org/attachments/2300/204_304_keep_alive.patch

When I try and compile this code (VS2010) I am getting the following error:
`error C3499: a lambda that has been specified to have a void return type cannot return a value`

    void DataFile::removeComments()
    {
      string::const_iterator start, end;
      boost::regex expression(&quot;^\\s?#&quot;);
      boost::match_results&lt;std::string::const_iterator&gt; what;
      boost::match_flag_type flags = boost::match_default;
      // Look for lines that either start with a hash (#)
      // or have nothing but white-space preceeding the hash symbol
      remove_if(rawLines.begin(), rawLines.end(), [&amp;expression, &amp;start, &amp;end, &amp;what, &amp;flags](const string&amp; line)
      {
        start = line.begin();
        end = line.end();
        bool temp = boost::regex_search(start, end, what, expression, flags);
        return temp;
      });
    }

How did I specify that the lambda has a &#39;void&#39; return type. More-over, how do I specify that the lambda has &#39;bool&#39; return type?

**UPDATE**

The following compiles. Can someone please tell me why that compiles and the other does not?

    void DataFile::removeComments()
    {
      boost::regex expression(&quot;^(\\s+)?#&quot;);
      boost::match_results&lt;std::string::const_iterator&gt; what;
      boost::match_flag_type flags = boost::match_default;
      // Look for lines that either start with a hash (#)
      // or have nothing but white-space preceeding the hash symbol
      rawLines.erase(remove_if(rawLines.begin(), rawLines.end(), [&amp;expression, &amp;what, &amp;flags](const string&amp; line)
      { return boost::regex_search(line.begin(), line.end(), what, expression, flags); }));
    }

Explicit Return Type of Lambda

I have changed several files in a git repository, but have not committed them yet.

I can get a list of the changes by just invoking `git status`. But how do I get a listing of the *lines* or the *content* that I have changed, in addition to the filenames?

I initially thought about using [git diff][1], but it seems to be useful only for comparing already commited changes.

Usually I just do `meld .`, but on this case I&#39;m connected to an external server via ssh.


  [1]: http://schacon.github.com/git/git-diff.html

git - diff of current changes before committing

&gt; **Possible Duplicate:**  
&gt; [What does &amp;ldquo;WARN Could not determine content-length of response body.&amp;rdquo; mean and how to I get rid of it?](https://stackoverflow.com/questions/7082364/what-does-warn-could-not-determine-content-length-of-response-body-mean-and-h)  

&lt;!-- End of automatically inserted text --&gt;

I just upgraded to rails 3.2.2, and now on rails s, page load, I get all these errors in the log:

    [2012-03-07 19:46:14] WARN  Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true
    [2012-03-07 19:46:14] WARN  Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true


Per previous SO threads, I tried the following:

**/config/application.rb**

    config.assets.logger = false
    config.assets.logger = nil

None of these worked. Any ideas on how to disable this logging for this error? Or to fix the issue :)

Thanks

WARN Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true

> Possible Duplicate: 
> <a href="https://stackoverflow.com/questions/7082364/what-does-warn-could-not-determine-content-length-of-response-body-mean-and-h" target="_blank" rel="noopener noreferrer">What does “WARN Could not determine content-length of response body.” mean and how to I get rid of it?</a>

I just upgraded to rails 3.2.2, and now on rails s, page load, I get all these errors in the log:
<pre><code class="hljs language-css">[2012-03-07 19:46:14] WARN Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true
[2012-03-07 19:46:14] WARN Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true
</code></pre>
Per previous SO threads, I tried the following:
/config/application.rb
<pre><code class="hljs language-ini">config.assets.logger = false
config.assets.logger = nil
</code></pre>
None of these worked. Any ideas on how to disable this logging for this error? Or to fix the issue :)
Thanks

This seems fairly simple but I can&#39;t get it to turn up on Google.

If I have:

    class City &lt; ActiveRecord::Base
      has_many :photos
    end
    
    class Photo &lt; ActiveRecord::Base
      belongs_to :city
    end

I want to find all cities that have no photos. I&#39;d love to be able to call something like...

    City.where( photos.empty? )

...but that doesn&#39;t exist. So, how do you do this kind of query?

- - - - -

**Update:**
Having now found an answer to the original question, I&#39;m curious, how do you construct the inverse?

IE: if I wanted to create these as scopes:

    scope :without_photos, includes(:photos).where( :photos =&gt; {:city_id=&gt;nil} )
    scope :with_photos, ???

Rails find record with zero has_many records associated

I created a GIT repo, locally. I now see a bunch of files i rather ignore for GIT check-in.  This brings me to the question: is there any default .gitignore for Rails?  Any best practices?

I think of *tmp* and *log* for sure. But are there any other files or folders i should consider?


Rails which files to ignore for GIT

I have an ActiveRecord model that has a date attribute.  Is it possible to utilize that date attribute to find by Year, Day and Month:

    Model.find_by_year(2012)
    Model.find_by_month(12)
    Model.find_by_day(1)

or is it simply possible to find_by_date(2012-12-1).

I was hoping I could avoid creating Year, Month and Day attributes. 



ActiveRecord Find By Year, Day or Month on a Date field

I&#39;m trying to version my API like Stripe has. Below is given the latest API version is 2.

`/api/users` returns a 301 to `/api/v2/users`

`/api/v1/users` returns a 200 of users index at version 1

`/api/v3/users` returns a 301 to `/api/v2/users`

`/api/asdf/users` returns a 301 to `/api/v2/users`

So that basically anything that doesn&#39;t specify the version links to the latest unless the specified version exists then redirect to it.

This is what I have so far:


    scope &#39;api&#39;, :format =&gt; :json do
      scope &#39;v:api_version&#39;, :api_version =&gt; /[12]/ do
        resources :users
      end

      match &#39;/*path&#39;, :to =&gt; redirect { |params| &quot;/api/v2/#{params[:path]}&quot; }
    end


API Versioning for Rails Routes

I use twitter-boostrap and I&#39;d like to use [these radio-buttons][1] in my form.
The problem is when I click on any of these buttons, the form is immediately submitted.
How to avoid this? I just want to use default buttons like radio-buttons.

from:

    &lt;%= form_for @product do |f| %&gt;
        &lt;div class=&quot;control-group&quot;&gt;
          &lt;%= f.label :type, :class =&gt; &#39;control-label&#39; %&gt;

          &lt;div class=&quot;controls&quot;&gt;
            &lt;div class=&quot;btn-group&quot; data-toggle=&quot;buttons-radio&quot;&gt;
              &lt;button class=&quot;btn&quot;&gt;Button_1&lt;/button&gt;
              &lt;button class=&quot;btn&quot;&gt;Button_2&lt;/button&gt;
            &lt;/div&gt;
          &lt;/div&gt;

        &lt;/div&gt;
    
        &lt;div class=&quot;form-actions&quot;&gt;
          &lt;%= f.submit nil, :class =&gt; &#39;btn btn-primary&#39; %&gt;
          &lt;%= link_to &#39;Cancel&#39;, products_path, :class =&gt; &#39;btn&#39; %&gt;
        &lt;/div&gt;
    &lt;% end %&gt;

javascript:

    // application.js
    $(&#39;.tabs&#39;).button();

  [1]: http://twitter.github.com/bootstrap/javascript.html#buttons

Form is submitted when I click on the button in form. How to avoid this?

I was installing rails(v3) on my Ubuntu Linux Box &amp; the install failed complaining of missing javascript runtime. I did some lookup &amp; it turns out that rails require a javascript runtime to be installed on the platform its running. 

While, Windows has come bundled with jscript by default. My Ubuntu box didn&#39;t have a js runtime &amp; I fixed the issue by installing node.js(V8). 

AFAIK, a js runtime is required to execute javascript code &amp; rails is just a web framework in which javascript are embedded. Javascript files run only on client machines. 

So,
**Why does rails require JavaScript Runtime?**

Why does rails require JavaScript Runtime?

I have a model named Topic, that has a name as a field.

So say I have a term I&#39;m searching for, apple.

If I do a 

    Topic.find_by_name(&quot;apple&quot;)

I get a record back with the name apple. That&#39;s good -- but how do I change find_by_name so that it can find &quot;apple juice&quot; as well as &quot;apple&quot; -- basically, find names that contain the original query or exactly match the original query?

&lt;b&gt;Edit:&lt;/b&gt;
Thanks for all the response. I guess I should&#39;ve been a little more clear earlier, but what if I want to find by a variable name (obviously I&#39;m not going to want to find by the name &quot;apple&quot; everytime :) )?

How do I manipulate Topic.where to accommodate for this?
So something like...

    @topic = Topic.where(......., @name)

Rails: How to find_by a field containing a certain string

I added omniauth gem to my gemfile and tried to run bundle install, but got a message about incompatibility of rails and bundler versions. I tried to update rails, but got messages about incompatibility with other gems. How can I downgrade bundler to 1.0? 

    $ bundle install
    Fetching gem metadata from http://rubygems.org/......
    Fetching gem metadata from http://rubygems.org/..
    Bundler could not find compatible versions for gem &quot;bundler&quot;:
      In Gemfile:
        rails (= 3.0.0) ruby depends on
          bundler (~&gt; 1.0.0) ruby

      Current Bundler version:
        bundler (1.1.1)

    This Gemfile requires a different version of Bundler.
    Perhaps you need to update Bundler by running `gem install bundler`?

and

    $ bundle update rails
    Fetching gem metadata from http://rubygems.org/......
    Fetching gem metadata from http://rubygems.org/..
    Bundler could not find compatible versions for gem &quot;bundler&quot;:
      In Gemfile:
        factory_girl_rails (&gt;= 0) ruby depends on
          bundler (~&gt; 1.0.0) ruby

      Current Bundler version:
        bundler (1.1.1)



Content Type	Original Author	Original Content on Stackoverflow
Question	AnApprentice	View Question on Stackoverflow
Solution 1 - Ruby on-Rails	Cam Song	View Answer on Stackoverflow
Solution 2 - Ruby on-Rails	Anthony	View Answer on Stackoverflow
Solution 3 - Ruby on-Rails	Amiel Martin	View Answer on Stackoverflow

WARN Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true

Ruby on-Rails Problem Overview

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

Solution 2 - Ruby on-Rails

Solution 3 - Ruby on-Rails

git - diff of current changes before committing

Explicit Return Type of Lambda

Attributions