Just pass them in... Rails has a default `:data` hash

    = link_to body, url, :data =&gt; { :foo =&gt; &#39;bar&#39;, :this =&gt; &#39;that&#39; }

One gotcha - you must surround symbols with quotes if they include a dash:

    :data =&gt; { :&#39;foo-bar&#39; =&gt; &#39;that&#39; }

**Update:** In Rails 4, underscores are automatically converted to dashes, so you can do this:

    :data =&gt; { :foo_bar =&gt; &#39;that&#39; }
Alternatively you can just write it directly:

    = link_to body, url, :&#39;data-foo&#39; =&gt; &#39;bar&#39;, :&#39;data-this&#39; =&gt; &#39;that&#39;

**Update 2:** As pointed out in the comments, Ruby 1.9+ allows this syntax, which is now the preferred formatting:

    { data: { foo: &quot;bar&quot; } }

Add a `data-` attribute by doing the following:

    link_to &quot;Hello&quot;, hello_path, :&quot;data-attribute&quot; =&gt; &quot;yeah!&quot;

By default, it seems that logcat will truncate any log message that it considers to be &quot;too long&quot;.  This happens both inside of Eclipse and when running logcat on the command line using `adb -d logcat`, and is truncating some important debugging messages.  

Is there any way to increase the maximum string length supported by logcat to get it to stop truncating the debug information?  The [official documentation][1] implies that there may not be, but maybe logcat supports some additional options not mentioned there?


  [1]: http://developer.android.com/guide/developing/tools/logcat.html

Android - Set max length of logcat messages

I&#39;ve been trying to align an image to the center of the table td. It worked with setting margin-left to a specific value but it also increased the size of td too and that isn&#39;t exactly what I wanted



Is there any efficient ways of doing this? I used percentages for the height and witdh of the table.

Center image in table td in CSS

&gt; **Possible Duplicate:**  
&gt; [Best way to use html5 data attributes with rails content\_tag helper?](https://stackoverflow.com/questions/4258512/best-way-to-use-html5-data-attributes-with-rails-content-tag-helper)  

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

How can I use html5 `data-*` attrubute in my link_to helper (Rails)

The API says that I have to use this format `link_to(body, url, html_options = {})` but I have an error when I put it in html_options

Ex: 

    link_to &quot;whatever&quot;, @whatever_path, { class: &#39;my_class&#39;, data-tooltip: &#39;what I want&#39; }

Rails - link_to helper with data-* attribute

> Possible Duplicate: 
> <a href="https://stackoverflow.com/questions/4258512/best-way-to-use-html5-data-attributes-with-rails-content-tag-helper" target="_blank" rel="noopener noreferrer">Best way to use html5 data attributes with rails content_tag helper?</a>

How can I use html5 <code>data-*</code> attrubute in my link_to helper (Rails)
The API says that I have to use this format <code>link_to(body, url, html_options = {})</code> but I have an error when I put it in html_options
Ex:
<pre><code class="hljs language-kotlin">link_to "whatever", @whatever_path, { class: 'my_class', data-tooltip: 'what I want' }
</code></pre>

I would like to know the difference between Nginx and Unicorn. As far as I understand, Nginx is a web server while Unicorn is a Ruby HTTP server.

Since both Nginx and Unicorn can handle HTTP requests, what is the need to use the combination of Nginx and Unicorn for RoR applications?


Why does Unicorn need to be deployed together with Nginx?

When try to connect to the mysql server through my rails application, I get the following error

    D:/Program_Files/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require&#39;: 
    Incorrect MySQL client library version! This gem was compiled for 6.0.0 but the client library is 5.0.27. (RuntimeError)

How can I rectify it? 

mysql2 gem compiled for wrong mysql client library

I&#39;m testing a model with an after create callback that I&#39;d like to run only on some occasions while testing. How can I skip/run callbacks from a factory?

    class User &lt; ActiveRecord::Base
      after_create :run_something
      ...
    end

Factory:

    FactoryGirl.define do
      factory :user do
        first_name &quot;Luiz&quot;
        last_name &quot;Branco&quot;
        ...
        # skip callback

        factory :with_run_something do
          # run callback
      end
    end

Skip callbacks on Factory Girl and Rspec

`@numbers = [ 1, 2, 3, 4, 5, 6, 7, 8 ]`

`@numbers.last` will give me 8

I need to grab the last two records. So far I&#39;ve tried this, however it throws a `NoMethodError`:

`@numbers.last - 1`




Ruby/Rails - Get the last two values in an array

I have a PostgreSQL database for my Rails application. In the schema named &#39;public&#39; the main Rails models tables are stored etc. I have created a &#39;discogs&#39; schema which will have tables with names that are sometimes the same as in the &#39;public&#39; schema - which is one of the reasons that I&#39;m using schemas to organize this.

How would I setup models from the &#39;discogs&#39; schema in my app? I will be using Sunspot to let Solr index these models as well. I&#39;m unsure of how you would do this.

Using multiple PostgreSQL schemas with Rails models

I want to get possibility to select several Categories for one Post with multiple select.

I have next models: Post, Category and PostCategory.

    class Post &lt; ActiveRecord::Base
      has_many :post_categories
      has_many :categories, :through =&gt; :post_categories
    end

    class Category &lt; ActiveRecord::Base
      has_many :post_categories
      has_many :posts, :through =&gt; :post_categories
    end

    class PostCategory &lt; ActiveRecord::Base
      has_one    :post
      has_one    :category
      belongs_to :post      # foreign key - post_id
      belongs_to :category  # foreign key - category_id
    end

In my controller I have something like @post = Post.new .
I&#39;ve created some categories.

And in view I have:

    &lt;%= form_for @post do |f| %&gt;
        &lt;%= f.text_field :title %&gt;
        &lt;%= f.select :categories, :multiple =&gt; true %&gt;
        &lt;%= f.submit %&gt;
    &lt;% end %&gt;

And... where is my categories? I have only &quot;multiple&quot; in select options. I think it&#39;s something wrong with my form.

Rails 3: Multiple Select with has_many through associations

I have a large hash with nested arrays and hashes.  I would like to simply print it out so it &#39;readable&#39; to the user.

I would like it to be sort of like to_yaml - that&#39;s pretty readable - but still too tech looking.  

Ultimately its going to be end users who need to read these data chunks so they need to be formatted cleanly.

Any suggestions?

Best way to pretty print a hash

Is there good way to retrieve migration version number?

I need to implement a method in a model which behave differently on and beyond a specific migration version.

I found assume_migrated_upto_version in connection adapter is retrieving version from database but can&#39;t find others.

---

Background: I&#39;m trying to remove two columns from table A, want to move them into table B, and add association to the table B from the table A.

During this change, I need to access these two columns. but after that, I want to add proxy method for these columns for compatibility.

   

Rails migration: best way to retrieve current migration version

In Rails MVC, can you call a controller&#39;s method from a view (as a method could be called call from a helper)? If yes, how?


Can we call a Controller&#39;s method from a view (as we call from helper ideally)?

I am going through the Rails API docs for `collection_select` and they are god-awful. 

The heading is this:

`collection_select(object, method, collection, value_method, text_method, options = {}, html_options = {})`

And this is the only sample code they give:

`collection_select(:post, :author_id, Author.all, :id, :name_with_initial, :prompt =&gt; true)`

Can someone explain, using a simple association (say a `User` has_many `Plans`, and a `Plan` belongs to a `User`), what I want to use in the syntax and why?

**Edit 1:** Also, it would be awesome if you explained how it works inside a `form_helper` or a regular form. Imagine you are explaining this to a web developer that understands web development, but is &#39;relatively new&#39; to Rails. How would you explain it?

Can someone explain collection_select to me in clear, simple terms?

I want to show my web-site in landscape mode only, is it possibile? It does not matter what the orientation is of device in user&#39;s hand but the web site will always be in landscape mode. I have seen iPhone application working like that but can this be done for a web-site?



forcing web-site to show in landscape mode only

I have this line of code:

	$(&#39;#sitesAccordion .groupOfSites&#39;).click(function() {
        var lastOpenSite = $(this).siblings().hasClass(&#39;:not(.closedTab)&#39;);
        console.log(lastOpenSite);
	});

I get &quot;false&quot; instead of getting one of the other elements (assuming that there is one - and there must be). I guess the problem is with:

    .hasClass(&#39;:not(.closedTab)&#39;);

What is the problem?

My purpose is to create my own accordion (without using jQuery UI)

and I am trying to write it like this:

	$(&#39;#sitesAccordion .groupOfSites&#39;).click(function() {

        //Get the last opened tab
        var lastOpenSite = $(this).siblings().hasClass(&#39;:not(.closedTab)&#39;);

        //Close last opened tab and add class
        lastOpenSite.hide().toggleClass(&#39;closedTab&#39;);
        
        //Open the current Tab
        $(this).children(&#39;.accordionContent&#39;).toggle(&#39;fast&#39;);

        // remove class from open tab
        $(this).toggleClass(&#39;closedTab&#39;);


	});

Is this the best way?
thanks,
Alon

How to use in jQuery :not and hasClass() to get a specific element without a class

Is it possible to load an external font via inline CSS?

Note: I&#39;m *not* talking about using an external CSS file with a `@font-face` definition, but rather something like the following:

    &lt;h1 style=&quot;font-family:myfont;
        src:(&#39;http://example.com/font/myfont.tff&#39;)&quot;&gt;test&lt;/h1&gt;

Loading an external font via inline CSS

I have on page div:

    &lt;div id=&quot;here_table&quot;&gt;&lt;/div&gt;

and in jquery:

    for(i=0;i&lt;3;i++){
        $(&#39;#here_table&#39;).append( &#39;result&#39; +  i );
    }

this generating for me:

    &lt;div id=&quot;here_table&quot;&gt;
        result1 result2 result3 etc
    &lt;/div&gt;

I would like receive this in table:

    &lt;div id=&quot;here_table&quot;&gt;
        &lt;table&gt;
              &lt;tr&gt;&lt;td&gt;result1&lt;/td&gt;&lt;/tr&gt;
              &lt;tr&gt;&lt;td&gt;result2&lt;/td&gt;&lt;/tr&gt;
              &lt;tr&gt;&lt;td&gt;result3&lt;/td&gt;&lt;/tr&gt;
        &lt;/table&gt;
    &lt;/div&gt;

I doing:


    $(&#39;#here_table&#39;).append(  &#39;&lt;table&gt;&#39; );

     for(i=0;i&lt;3;i++){
        $(&#39;#here_table&#39;).append( &#39;&lt;tr&gt;&lt;td&gt;&#39; + &#39;result&#39; +  i + &#39;&lt;/td&gt;&lt;/tr&gt;&#39; );
    }

     $(&#39;#here_table&#39;).append(  &#39;&lt;/table&gt;&#39; );



but this generate for me:

    &lt;div id=&quot;here_table&quot;&gt;
        &lt;table&gt; &lt;/table&gt; !!!!!!!!!!
              &lt;tr&gt;&lt;td&gt;result1&lt;/td&gt;&lt;/tr&gt;
              &lt;tr&gt;&lt;td&gt;result2&lt;/td&gt;&lt;/tr&gt;
              &lt;tr&gt;&lt;td&gt;result3&lt;/td&gt;&lt;/tr&gt;
    &lt;/div&gt;

Why? how can i make this correctly?


LIVE: http://jsfiddle.net/n7cyE/

Create table with jQuery - append

Is there any way to check if a selected (x,y) point of a PNG image is transparent?

Content Type	Original Author	Original Content on Stackoverflow
Question	eveevans	View Question on Stackoverflow
Solution 1 - Ruby on-Rails	sethvargo	View Answer on Stackoverflow
Solution 2 - Ruby on-Rails	Robin	View Answer on Stackoverflow

Rails - link_to helper with data-* attribute

Ruby on-Rails Problem Overview

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

Solution 2 - Ruby on-Rails

Center image in table td in CSS

Android - Set max length of logcat messages

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