    &lt;%= f.submit &#39;name of button here&#39;, :class =&gt; &#39;submit_class_name_here&#39; %&gt;

This should do. If you&#39;re getting an error, chances are that you&#39;re not supplying the name.

Alternatively, you can style the button without a class:

    form#form_id_here input[type=submit]

Try that, as well.

You can add a class declaration to the submit button of a form by doing the following: 

`&lt;%= f.submit class: &#39;btn btn-default&#39; %&gt;` &lt;-- Note: there is no comma!

If you are altering a __form.html.erb_ partial of a scaffold and you want to keep
the dynamic change of the button name between controller actions, DO NOT specify a name `&#39;name&#39;`.

Without specifying a name and depending on the action the form is rendered the button will get the `.class = &quot;btn btn-default&quot;` (Bootstrap class)(or whatever `.class` you specify) with the following names: 

- **Update model_name**

- **Create model_name**  
(where model_name the name of the scaffold&#39;s model)

## Rails 4  and Bootstrap 3 &quot;primary&quot; button

    &lt;%= f.submit nil, :class =&gt; &#39;btn btn-primary&#39; %&gt;

Yields something like:

[![screen-2014-01-22_02.24.26.png][1]][1]
&lt;!-- source: http://img854.imageshack.us/img854/9148/2wlx.png --&gt;


 [1]: https://i.stack.imgur.com/5lHao.png

As Srdjan Pejic says, you can use 

    &lt;%= f.submit &#39;name&#39;, :class =&gt; &#39;button&#39; %&gt;

or the new syntax which would be:

    &lt;%= f.submit &#39;name&#39;, class: &#39;button&#39; %&gt;



## Add class key-value pair

    &lt;%= f.submit &quot;Submit&quot;, class: &#39;btn btn-primary&#39; %&gt;


  [1]: https://i.stack.imgur.com/3E56q.png

By default, Rails 4 uses the &#39;value&#39; attribute to control the visible button text, so to keep the markup clean I would use

    &lt;%= f.submit :value =&gt; &quot;Visible Button Text&quot;, :class =&gt; &#39;class_name&#39; %&gt;

both of them works
`&lt;%= f.submit class: &quot;btn btn-primary&quot; %&gt;` and
`&lt;%= f.submit &quot;Name of Button&quot;, class: &quot;btn btn-primary &quot;%&gt;`

For the &quot;Hello World&quot; example in [**android.com**][1], the package name is    
`&quot;package com.example.helloandroid;&quot;`

Is there any guideline/standard to name this package? (references would be nice)



  [1]: http://developer.android.com/resources/tutorials/hello-world.html

Android - Package Name convention

How in the world do you get just an element at index **i** from the List in scala?

I tried `get(i)`, and  `[i]` - nothing works. Googling only returns how to &quot;find&quot; an element in the list. But I already know the index of the element!

Here is the code that does not compile:

    def buildTree(data: List[Data2D]):Node ={
	  if(data.length == 1){
	 	  var point:Data2D = data[0]  //Nope - does not work
	 	   
	  }
	  return null
    }

Looking at the [List api][1] does not help, as my eyes just cross.


  [1]: https://www.scala-lang.org/api/current/scala/collection/immutable/List.html

Get item in the list in Scala?

My question is easy:

    &lt;%= f.submit %&gt;

Where does the class declaration go? I&#39;m getting errors on multiple attempts.

Add a CSS class to &lt;%= f.submit %&gt;

<p>My question is easy:</p>
<pre><code class="hljs">&#x3C;%= f.submit %>
</code></pre>
<p>Where does the class declaration go? I'm getting errors on multiple attempts.</p>


What is the best way to go about getting embedded HTML in the body of a link generated with the link_to method?

I basically want the following:

    &lt;a href=&quot;##&quot;&gt;This is a &lt;strong&gt;link&lt;/strong&gt;&lt;/a&gt;

I have been trying to go about this as suggested in https://stackoverflow.com/questions/2685436/rails-and-the-span-tag but with no luck. My code looks like the following:

item_helper.rb
--------------
    def picture_filter
        #...Some other code up here
        text = &quot;Show items with &quot; + content_tag(:strong, &#39;pictures&#39;)
        link_to text, {:pics =&gt; true}, :class =&gt; &#39;highlight&#39;
    end

item_view.html.erb
------
     #...
     &lt;%=raw picture_filter %&gt;
     #...


Embedded HTML in link_to body in Rails

Consider a simple association...

    class Person
       has_many :friends
    end

    class Friend
       belongs_to :person
    end

What is the cleanest way to get all persons that have NO friends in ARel and/or meta_where?

And then what about a has_many :through version

    class Person
       has_many :contacts
       has_many :friends, :through =&gt; :contacts, :uniq =&gt; true
    end

    class Friend
       has_many :contacts
       has_many :people, :through =&gt; :contacts, :uniq =&gt; true
    end

    class Contact
       belongs_to :friend
       belongs_to :person
    end

I really don&#39;t want to use counter_cache - and I from what I&#39;ve read it doesn&#39;t work with has_many :through

I don&#39;t want to pull all the person.friends records and loop through them in Ruby - I want to have a query/scope that I can use with the meta_search gem

I don&#39;t mind the performance cost of the queries

And the farther away from actual SQL the better...


Want to find records with no associated records in Rails

I want to have a `form_for @user`, but post to a custom action in the users controller.

How can I do this?

form_for but to post to a different action

How do I delete all records in one of my database tables in a Ruby on Rails app?

Deleting all records in a database table

I want my urls to use dash `-` instead of underscore `_` as word separators. For example `controller/my-action` instead of `controller/my_action`.

I&#39;m surprised about two things:

1. Google et al. continue to distinguish them. 
2. That Ruby on Rails doesn&#39;t have a simple, global configuration parameter to map `-` to `_` in the routing. Or does it? 

The best solution I&#39;ve is to use `:as` or a named route.

My idea is to modify the Rails routing to check for that global config and change `-` to `_` before dispatching to a controller action.

Is there a better way?

Routes with Dash `-` Instead of Underscore `_` in Ruby on Rails

After [proudly coloring my liststyle bullet without any image url or span tags][1], via:

    ul{ list-style: none; padding:0;  margin:0;  }
    li{ padding-left: 1em; text-indent: -1em;    }
    li:before { content: &quot;■&quot;; padding-right:7px; }

Although these stylesheets work perfectly down to the rounded borders and other css3 stuff, and  although the recipient of the email (for instance, Eudora OSE 1) renders all css styles correctly, just like in a browser, there is one problem: the bullets like `•` or `■` become converted into `&amp;#adabacadabra;`

Appearing finally like so in emails: 

![enter image description here][2]

How do I proceed from here?

  [1]: https://stackoverflow.com/questions/5306640/how-to-define-the-color-of-bullets-in-ul-li-lists-via-css
  [2]: http://i.stack.imgur.com/t3okD.png

li:before{ content: &quot;■&quot;; } How to Encode this Special Character as a Bullit in an Email Stationery?

Is it possible to select elements in CSS by their HTML5 data attributes (for example, `data-role`)?

Select elements by attribute in CSS

Anyone know of an easy way to style a website with a windows phone 7 like metro theme ?  
Either a `CSS` or a `jQuery`-based theme would work.

Metro theme for website

I have an item on the DOM that I&#39;d simply like to have fill its parent&#39;s width, regardless of what that is:

    &lt;div width=&quot;800&quot;&gt;
        &lt;div class=&quot;filler&quot;&gt;&lt;/div&gt;
    &lt;/div&gt;

How can I specify in CSS that the `filler` class match the width of its parent?

    .filler {
        ?
    }

CSS for &quot;fill parent width?&quot;

Is there an easy way to get a tag name?

For example, if I am given `$(&#39;a&#39;)` into a function, I want to get `&#39;a&#39;`.

jQuery: Get selected element tag name

So, I&#39;ve found several examples for finding a random record in Rails 2 -- the preferred method seems to be:

    Thing.find :first, :offset =&gt; rand(Thing.count)

Being something of a newbie I&#39;m not sure how this could be constructed using the new find syntax in Rails 3.

So, what&#39;s the &quot;Rails 3 Way&quot; to find a random record?

Rails 3: Get Random Record

**[update: by not using `rake routes`, just to understand Rails console a little more]**

It seems like inside of &quot;rails console&quot; for Rails 3, we can use `controller`, but in Rails 2.2 or 2.3, we need to use `@controller`

And in Rails 3, we can print out all the routes added by Rails routing for a scaffold `foo`:

    ruby-1.9.2-p0 &gt; puts controller.public_methods.grep(/path|url/).grep(/foo/).sort.join(&quot;\n&quot;)
    edit_foo_path
    edit_foo_url
    foo_path
    foo_url
    foos_path
    foos_url
    new_foo_path
    new_foo_url

but on Rails 2.3.8, it gives a bunch of `formatted_foos_path`, etc, and gives nothing for Rails 2.2.2.  How to make it print out for Rails 2.3.8 and 2.2.2?

---

Details for Rails 2.3.8:

    ruby-1.8.7-p302 &gt; puts @controller.public_methods.grep(/path|url/).grep(/foo/).sort.join(&quot;\n&quot;)
    formatted_edit_foo_path
    formatted_edit_foo_url
    formatted_foo_path
    formatted_foo_url
    formatted_foos_path
    formatted_foos_url
    formatted_new_foo_path
    formatted_new_foo_url



In Rails, how to see all the &quot;path&quot; and &quot;url&quot; methods added by Rails&#39;s routing? (update: using Rails console)

I&#39;ve got an route for my users like `/iGEL/contributions`, which works fine. But now a user registered with a name like &#39;A.and.B.&#39;, and now the route fails to match, since the name contains dots.

My route:

    get &quot;/:user/contributions&quot; =&gt; &#39;users#contributions&#39;

Any ideas?

Why do routes with a dot in a parameter fail to match?

How can you have a hidden field with simple form?

The following code:

    = simple_form_for @movie do |f|
      = f.hidden :title, &quot;some value&quot;
      = f.button :submit

results in this error:

    undefined method `hidden&#39; for #SimpleForm::FormBuilder:0x000001042b7cd0

Content Type	Original Author	Original Content on Stackoverflow
Question	sscirrus	View Question on Stackoverflow
Solution 1 - Ruby on-Rails	Srdjan Pejic	View Answer on Stackoverflow
Solution 2 - Ruby on-Rails	aloucas	View Answer on Stackoverflow
Solution 3 - Ruby on-Rails	cwd	View Answer on Stackoverflow
Solution 4 - Ruby on-Rails	RailsZilla.com	View Answer on Stackoverflow
Solution 5 - Ruby on-Rails	BenKoshy	View Answer on Stackoverflow
Solution 6 - Ruby on-Rails	benjamin.patch	View Answer on Stackoverflow
Solution 7 - Ruby on-Rails	gsumk	View Answer on Stackoverflow

Add a CSS class to <%= f.submit %>

Ruby on-Rails Problem Overview

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

Solution 2 - Ruby on-Rails

Solution 3 - Ruby on-Rails

Rails 4 and Bootstrap 3 "primary" button

Solution 4 - Ruby on-Rails

Solution 5 - Ruby on-Rails

Add class key-value pair

Solution 6 - Ruby on-Rails

Solution 7 - Ruby on-Rails

Get item in the list in Scala?

Android - Package Name convention

Attributions