Use single quotes around the symbol name, with the colon prefix:

    :&#39;data-role&#39; =&gt; &#39;button&#39;

And here is a nice reference on symbols:

http://www.troubleshooters.com/codecorn/ruby/symbols.htm#_What_do_symbols_look_like

After ```Ruby 1.9``` you can also do

    &#39;data-role&#39;: &#39;button&#39;



If you find the syntax `&lt;%= link_to &quot;Play&quot;, game_play_path, :&quot;data-role&quot; =&gt; &quot;button&quot; %&gt;` ugly because it uses the old hash syntax, another way to do it that involves using ruby 1.9 syntax for hashes is to do the following:

    &lt;%= link_to &quot;Play&quot;, game_play_path, data: {role: &quot;button&quot;} %&gt;

The hash imbrication generates the hyphen between data and role in the html output.

Be cautious because this only works with data-something attributes, but in your case it&#39;s a more eye pleasing alternative.

Also, if you have more data-something attributes, you can write them as well in the nested hash: 

    &lt;%= link_to &quot;Play&quot;, game_play_path, data: {role: &quot;button&quot;, other1: &quot;value1&quot;, other2: &quot;value2&quot;} %&gt;

Wrap it in single quotes:

    :&#39;data-role&#39; =&gt; &quot;button&quot;

    &lt;%= link_to &quot;Play&quot;, game_play_path, :&quot;data-role&quot; =&gt; &quot;button&quot; %&gt;


I&#39;m including a PHP class with

    require_once($ENGINE.&quot;/classUser.php&quot;);

but when the code is executed i receive this error:

&gt; Fatal error: Class &#39;User&#39; not found in
&gt; C:\xampp\htdocs\WebName\resources\engine\ajax\signup.php on line 12

I still can&#39;t figure out what&#39;s the problem. I&#39;m 99% sure it&#39;s correct.

The &quot;$ENGINE&quot; is correct, and the class is correct too (Netbeans suggests me class methods and variables).

signup.php:

    &lt;?php
    
    /* Created on: 13/12/2011
     * Author: 
     * 
     * Description: User signup procedure.
     */
    
    require_once(&quot;../settings.php&quot;);
    require_once($ENGINE.&quot;/classUser.php&quot;);
            
    $user = new User();
    $user-&gt;createUser($_POST[&quot;username&quot;], $_POST[&quot;email&quot;], $_POST[&quot;password&quot;]);
    
    
    ?&gt;

classUser.php:

    &lt;?php
    
    /* Created on: 13/12/2011
     * Author: 
     * 
     * Description: This class manages users.
     */
    
    require_once(&quot;settings.php&quot;);
    require_once($LIBRARY.&quot;/cassandraphp/cassandra.php&quot;);
    
    class User {
        
        public function createUser($username, $email, $password){
            $cassandra = Cassandra::createInstance($CASSANDRASERVER);
            $cassandra-&gt;set(
                    &quot;user.&quot;.$username,
                    array(
                        &#39;ID&#39; =&gt; uniqid(),
                        &#39;Username&#39; =&gt; $username,
                        &#39;Email&#39; =&gt; $email,
                        &#39;Password&#39; =&gt; $password
                    )
            );
        } 
    }
    
    ?&gt;



PHP class not found but it&#39;s included

If I want to process data in a `std::vector` with SSE, I need 16 byte alignment. How can I achieve that? Do I need to write my own allocator? Or does the default allocator already align to 16 byte boundaries?

How is a vector&#39;s data aligned?

I&#39;m using jquery-mobile with Ruby On Rails.

I want to create a button link which implies to have `data-role=&quot;button&quot;` appear in the generated HTML. 

I&#39;ve tried:

    &lt;%= link_to &quot;Play&quot;, game_play_path, :data-role =&gt; &quot;button&quot; %&gt;

But then, I get an error

    undefined local variable or method `role&#39; for #&lt;#&lt;Class:0x007fdc25668ee8&gt;:0x007fdc25658610&gt;

Is there a way to escape the dash using the `:xxx` notation or should I just use the `&quot;xxx&quot;` notation?

(I agree it&#39;s a cosmetic question, but I want my code to be consistent and don&#39;t like exceptions)

How to escape a dash &quot;-&quot; in a Ruby symbol?

I'm using jquery-mobile with Ruby On Rails.
I want to create a button link which implies to have <code>data-role="button"</code> appear in the generated HTML.
I've tried:
<pre><code class="hljs language-ruby">&#x3C;%= link_to "Play", game_play_path, :data-role => "button" %>
</code></pre>
But then, I get an error
<pre><code class="hljs language-sql">undefined local variable or method `role' for #&#x3C;#&#x3C;Class:0x007fdc25668ee8>:0x007fdc25658610>
</code></pre>
Is there a way to escape the dash using the <code>:xxx</code> notation or should I just use the <code>"xxx"</code> notation?
(I agree it's a cosmetic question, but I want my code to be consistent and don't like exceptions)

What is the difference between an it block and a specify block in RSpec?

    subject { MovieList.add_new(10) }
    
    specify { subject.should have(10).items }
    it { subject.track_number.should == 10}

They seem to do the same job. Just checking to be sure.

Difference between an it block and a specify block in RSpec

I am developing a **Ruby on Rails** app. My question is more about **Ruby** syntax. 

I have a model class with a class method `self.check`:

    class Cars &lt; ActiveRecord::Base
      ...
      def self.check(name)
         self.all.each do |car|
              #if result is true, break out from the each block, and return the car how to...
              result = SOME_CONDITION_MEET?(car) #not related with database
         end

         puts &quot;outside the each block.&quot;
      end
    end

I would like to stop/break out from the `each` block **once** the `result` is **true** (that&#39;s break the `each` block if `car.name` is the same as the `name` parameter **once**) AND return the `car` which cause the **true** result. How to break out in Ruby code?

Ruby syntax: break out from &#39;each.. do..&#39; block

AS the title says I am trying to check whether a variable is defined in SASS. (I am using compass if that makes any different difference)

I&#39;ve found the Ruby equivalent which is:

&lt;pre&gt;&lt;code&gt;defined? foo&lt;/code&gt;&lt;/pre&gt;

Gave that a shot in the dark but it just gave me the error:

`defined&quot;: expected &quot;{&quot;, was &quot;?`

I&#39;ve found a work around (which is obviously just to define the variable in all cases, which in this case it actually makes more sense) but I&#39;d really like to know if this is possible for the future



Checking if a variable is defined in SASS

I have a `public/cache` folder which has files and folders. How can I completely empty that folder using a rake task?

How to delete all contents of a folder with Ruby-Rails?

Is there a Ruby class/method where I could pass &quot;a full path&quot;, `home/me/a_file.txt`, to identify whether it is a valid file path?



How to check for file existence

I&#39;m using backbone.js and it works great. but the forms I&#39;m creating as a javascript template lacks the rails csrf protection token. How do I add it to templates I&#39;m creating in javascript?

Rails - How to add CSRF Protection to forms created in javascript?

I&#39;ve seen a few questions (namely [this one][1]) here on SO about adding a default boolean value to an existing column. So I tried the `change_column` suggestion but I mustn&#39;t be doing it right.

I tried:

    $ change_column :profiles, :show_attribute, :boolean, :default =&gt; true

Which returns `-bash: change_column: command not found`

I then ran:

    $ rails g change_column :profiles, :show_attribute, :boolean, :default =&gt; true

...and

    $ rails change_column :profiles, :show_attribute, :boolean, :default =&gt; true

Then ran `rake db:migrate`, but the value for `:show_attribute` remained `nil`. In the question I referenced above it says in PostgreSQL you need to update it manually. Since I&#39;m using PostgreSQL I added the following in my `create_profiles` migration:

    t.boolean :show_attribute, :default =&gt; true

Can someone tell me what I&#39;m doing wrong here?

  [1]: https://stackoverflow.com/questions/7098602/add-a-default-value-to-a-column-through-a-migration

Adding :default =&gt; true to boolean in existing Rails column

I am using Heroku for my application and it requires PostgreSQL but you can still use SQLite3 for development. Since Heroku strongly advised against having 2 different databases I decided to change to PostgreSQL for development. I installed the `gem pg` and also went to the official PostgreSQL site to get the Windows installer and also changed my `database.yml`. During installation it requires a password for PostgreSQL so I made one. 
I had to change the `pg_hba.conf` file from using `md5` to `trust` in order get past: `fe_sendauth: no password supplied` when trying to create the database.

    # TYPE  DATABASE        USER            ADDRESS                 METHOD
    
    # IPv4 local connections:
    host    all             all             127.0.0.1/32            trust # was md5
    # IPv6 local connections:
    host    all             all             ::1/128                 trust # was md5
    # Allow replication connections from localhost, by a user with the
    # replication privilege.
    #host    replication     postgres        127.0.0.1/32            trust
    #host    replication     postgres        ::1/128                 trust

After getting rid of that though, I now get this:

    $ rake db:create
    (in C:/app)
    FATAL:  role &quot;User&quot; does not exist 
    Couldn&#39;t create database for {&quot;adapter&quot;=&gt;&quot;postgresql&quot;, &quot;encoding&quot;=&gt;&quot;utf8&quot;, 
    &quot;database&quot;=&gt;&quot;app_test&quot;, &quot;pool&quot;=&gt;5, &quot;username&quot;=&gt;nil, &quot;password&quot;=&gt;nil} 

I do still have my `development.sqlite3` and `text.sqlite3` present, could that be the issue? What must be done?

Here is my full gist: https://gist.github.com/1522188







Role does not exist and unable to create database when using PostgreSQL

I am developing a Android app using Jquery Mobile/Phonegap. I have the following code to control the phone&#39;s back button:

    document.addEventListener(&quot;backbutton&quot;, backKeyDown, true); 


    function backKeyDown() { 
        // Call my back key code here.
        $.mobile.changePage(&quot;#homepage&quot;, &quot;slideup&quot;);
    }

This all works fine, but I would like the app to close when pressing the back button on the homepage only, is this possible?

Phonegap Android Back Button - close app with back button on homepage

I’m working on a web app that has its own look and feel. I want to use jQuery Mobile for the touch events support only. 

When I link jquery.mobile.min.js (without linking the css), then the layout of my page is broken. 

How can I configure (initialize) jQuery Mobile to only use touch events support? Would I bind the events in the jQuery document ready hook since I&#39;d not have any JQM page related event?

**Edit**

See this example in jsfiddle: http://jsfiddle.net/redhotsly/JGgrw/. The html contains a `&lt;button&gt;` but jQuery Mobile created a `&lt;span&gt;` to its left. If you inspect the resulting markup (F12) you will see that jQuery Mobile also added a CSS class to my button.

**Edit:**

I need a solution where I&#39;ll not have modify the JQM script. I need to use the official script off a CDN.

How to use jQuery Mobile for its touch event support only (no UI enhancements)?

I am struggling somewhat with pre-compilation of templates in Handlebars. My jQuery Mobile project is getting pretty big template-wise and I wish to pre-compile the templates I use.

However I can&#39;t seem to find a good explanation (like a step by step tutorial) of how to do this with Handlebars.

I still have my templates all inline using the script tags. I have handlebars installed using NPM. But now I am kinda lost in how to proceed. 

I am guessing doing something like

    handlebars -s event.handlebars &gt; event.compiled

and somehow including the event.compiled contents? But then, how to call it.

I am calling my templates like so

    var source = $(&#39;#tmpl_profile&#39;).html(),
	template = Handlebars.compile(source),
	context = user.profile()),
	html    = template(context);

Hope someone can shed some light on this for me.

Using pre-compiled templates with Handlebars.js (jQuery Mobile environment)

I&#39;m diving into writing a mobile app with jQuery Mobile/PhoneGap. I&#39;m using [this sample template][1] to start from, which uses HTML/JS to create the pages. Rather than have all the `&lt;page&gt;` tags in one single html file, he&#39;s got it split up so it&#39;s easier to edit.

**Since I will have a separate file for each page, what&#39;s the best way to include the tempated header/footer?** I&#39;ve only seen it where you need to copy and paste the whole footer-&gt;navbar code into each HTML page. This doesn&#39;t seem like it should be. For example, if you want to change one menu item, you need to go into each page and change it. 

What&#39;s the solution that I&#39;m missing?

Maybe I&#39;m just not understanding jQuery Mobile. For example, their sidebar they use for their docs - is that sidebar code copy and pasted onto each page? That doesn&#39;t make sense. It&#39;s the same idea as the question I&#39;m asking here about the footer. 

http://jquerymobile.com/test/docs/pages/page-cache.html


This is what I&#39;ve got that doesn&#39;t seem right (and `$.live(&#39;pageinit&#39;)` isn&#39;t working). This HTML is what goes on each HTML page:

    &lt;div id=&quot;mainFooter&quot; data-position=&quot;fixed&quot; data-id=&quot;mainFooter&quot; data-role=&quot;footer&quot; class=&quot;ui-footer ui-bar-a ui-footer-fixed fade ui-fixed-inline&quot; role=&quot;contentinfo&quot; style=&quot;top: 58px;&quot;&gt;
  &lt;/div&gt;

And the JS

    $.live(&#39;pageinit&#39;, function (event) {
        displayFooter();
    });
    
    function displayFooter() {
        $(&#39;#mainFooter&#39;).html(&#39;&lt;div data-role=&quot;navbar&quot; class=&quot;nav-glyphish-example&quot; data-grid=&quot;d&quot;&gt;&#39; +
            &#39;&lt;ul&gt;&#39; +
            &#39;&lt;li&gt;&lt;a href=&quot;#&quot; id=&quot;menuitem1&quot; data-icon=&quot;custom&quot;&gt;Menu Item 1&lt;/a&gt;&lt;/li&gt;&#39; +
            &#39;&lt;li&gt;&lt;a href=&quot;#&quot; id=&quot;menuitem2&quot; data-icon=&quot;custom&quot;&gt;Menu Item 2&lt;/a&gt;&lt;/li&gt;&#39; +
            &#39;&lt;li&gt;&lt;a href=&quot;#&quot; id=&quot;menuitem3&quot; data-icon=&quot;custom&quot;&gt;Menu Item 3&lt;/a&gt;&lt;/li&gt;&#39; +
            &#39;&lt;/ul&gt;&#39; +
            &#39;&lt;/div&gt;&#39;);
    }


  [1]: http://coenraets.org/blog/2011/10/sample-application-with-jquery-mobile-and-phonegap/

Creating templated/persistant header/footer template in jQuery Mobile and PhoneGap

I&#39;m wondering if someone can give some advice as to which is &#39;better&#39;.  Twitter-bootstrap or JQuery mobile?

Thanks,
-peter

Content Type	Original Author	Original Content on Stackoverflow
Question	Dirty Henry	View Question on Stackoverflow
Solution 1 - Ruby	Andrew Kuklewicz	View Answer on Stackoverflow
Solution 2 - Ruby	Daniel Ristic	View Answer on Stackoverflow
Solution 3 - Ruby	mipadi	View Answer on Stackoverflow
Solution 4 - Ruby	clyfe	View Answer on Stackoverflow

How to escape a dash "-" in a Ruby symbol?

Ruby Problem Overview

Ruby Solutions

Solution 1 - Ruby

Solution 2 - Ruby

Solution 3 - Ruby

Solution 4 - Ruby

How is a vector's data aligned?

PHP class not found but it's included

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