Add a second `%` to the opening tag:

    label:
        body: &quot;&lt;%%= variable %&gt;&quot;

The `&lt;%%` sequence is [valid ERB][1], rendered as a literal `&lt;%`.

[1]:http://www.ruby-doc.org/stdlib/libdoc/erb/rdoc/classes/ERB.html

Despite reading &quot;[Understanding Ruby Symbols][1]&quot;, I&#39;m still confused by the representation of the data in memory when it comes to using symbols.  If a symbol, two of them contained in different objects, exist in the same memory location, then how is it that they contain _different_ values?  I&#39;d have expected the same memory location to contain the same value.

This a quote from the link:

&gt; Unlike strings, symbols of the same name are initialized and exist in memory only once during a session of ruby

I don&#39;t understand how it manages to differentiate the values contained in the same memory location.

Consider this example:

    patient1 = { :ruby =&gt; &quot;red&quot; }
    patient2 = { :ruby =&gt; &quot;programming&quot; }

    patient1.each_key {|key| puts key.object_id.to_s}
    3918094
    patient2.each_key {|key| puts key.object_id.to_s}
    3918094

`patient1` and `patient2` are both hashes, that&#39;s fine.  `:ruby` however is a symbol.  If we were to output the following:

    patient1.each_key {|key| puts key.to_s}

Then what will be output? `&quot;red&quot;`, or `&quot;programming&quot;`?


Forgetting hashes for a second, I&#39;m thinking a symbol is a _pointer_ to a value.  The questions I have are:

* Can I assign a value to a symbol?
* Is a symbol just a pointer to a variable with a value in it?
* If symbols are global, does that mean a symbol always points to one thing?

  [1]: http://web.archive.org/web/20140314193235/http://glu.ttono.us/articles/2005/08/19/understanding-ruby-symbols


How to understand symbols in Ruby

How do I add a new `DataColumn` to a `DataTable` object that already contains data?

PseudoCode

    //call SQL helper class to get initial data 
    DataTable dt = sql.ExecuteDataTable(&quot;sp_MyProc&quot;);
    
    dt.Columns.Add(&quot;NewColumn&quot;, type(System.Int32));
    
    foreach(DataRow row in dr.Rows)
    {
        //need to set value to NewColumn column
    }

How can I add a new column and data to a datatable that already contains data?

I have a simple `fixture.yml` file:

    label:
        body: &quot;&lt;%= variable %&gt;&quot;

The issue is that the ERB code is parsed as part of loading the fixture, whereas I actually want the body to be literally &quot;&lt;%= variable %&gt;&quot; (un-interpolated).

How do I escape the ERB tag?

How do I escape the ERB tag in ERB

I have a simple <code>fixture.yml</code> file:
<pre><code class="hljs language-css">label:
 body: "&#x3C;%= variable %>"
</code></pre>
The issue is that the ERB code is parsed as part of loading the fixture, whereas I actually want the body to be literally "&#x3C;%= variable %>" (un-interpolated).
How do I escape the ERB tag?

I&#39;ve done some reading about how to extend ActiveRecord:Base class so my models would have some special methods. What is the easy way to extend it (step by step tutorial)?

Rails extending ActiveRecord::Base

When we define routes in `routes.rb` using the name like `map.some_link`.We can use the link in two ways- `some_link_url`, `some_link_path`.

- What are the differences between the two?
- Which is more secure to be used? 



What is the difference between _url and _path while using the routes in rails

Is there an equivalent to PHP&#39;s urlencode in Ruby on Rails 2.3.5? (It encodes a string to be used in a query part of a URL)
I googled it but all the answers seem to date back to before 2006 and seems dates.
[This is what I found][1]. It seems a bit abnormal to call `CGI::escape` in a view.

Is there an equivalent helper function?

Thanks!


  [1]: http://ruby-doc.org/core/classes/CGI.html#M000532

url encode equivalent in ruby on rails

I&#39;m trying to create a new environment (build) for using it with hudson.

I&#39;m doing this because I didn&#39;t want to mix up my test databases with hudson test database.


How to create a new environment in Ruby on Rails?

I have a rails application running over Postgres.

I have two servers: one for testing and the other for production.

Very often I need to clone the production DB on the test server.

The command I&#39;m runnig via Vlad is:

    rake RAILS_ENV=&#39;test_server&#39; db:drop db:create

The problem I&#39;m having is that I receive the following error:

    ActiveRecord::StatementInvalid: PGError: ERROR: database &lt;database_name&gt; is being accessed by other users DROP DATABASE IF EXISTS &lt;database_name&gt;

This happens if someone has accessed the application via web recently (postgres keeps a &quot;session&quot; opened)

Is there any way that I can terminate the sessions on the postgres DB?

Thank you.

### Edit

I can delete the database using phppgadmin&#39;s interface but not with the rake task.

How can I replicate phppgadmin&#39;s drop with a rake task?


Rails + Postgres drop error: database is being accessed by other users

I am looking for the best way to go about testing the following static method (specifically using a Doctrine Model):

    class Model_User extends Doctrine_Record
    {
        public static function create($userData)
        {
            $newUser = new self();
            $newUser-&gt;fromArray($userData);
            $newUser-&gt;save();
        }
    }

Ideally, I would use a mock object to ensure that `fromArray` (with the supplied user data) and `save` were called, but that&#39;s not possible as the method is static.

Any suggestions?

PHPUnit Mock Objects and Static Methods

**Is there any way to pass generic types using a TestCase to a test in NUnit?**

This is what I would like to do but the syntax is not correct...

    [Test]
    [TestCase&lt;IMyInterface, MyConcreteClass&gt;]
    public void MyMethod_GenericCall_MakesGenericCall&lt;TInterface, TConcreteClass&gt;()
    {
        // Arrange
    
        // Act
        var response = MyClassUnderTest.MyMethod&lt;TInterface&gt;();
    
        // Assert
        Assert.IsInstanceOf&lt;TConcreteClass&gt;(response);
    }

Or if not, what is the best way to achieve the same functionality (obviously I&#39;ll have multiple TestCases in the real code)?

**Update with another example...**

Here is another example with a single generic type passed...

    [Test]
    [TestCase&lt;MyClass&gt;(&quot;Some response&quot;)]
    public void MyMethod_GenericCall_MakesGenericCall&lt;T&gt;(string expectedResponse)
    {
        // Arrange
    
        // Act
        var response = MyClassUnderTest.MyMethod&lt;T&gt;();
    
        // Assert
        Assert.AreEqual(expectedResponse, response);
    }



NUnit TestCase with Generics

NUnit supports a feature where you can specify a set of data inputs for a unit test to be run multiple times.

    [RowTest]
    [Row(1001,1,2,3)]
    [Row(1,1001,2,3)]
    [Row(1,2,1001,3)]
    public void SumTests(int x, int y, int z, int expected)
    {
       ...
    }

What&#39;s the best way to accomplish this same type of thing using MSTest?  I can&#39;t find a similar set of attributes.

MSTest Equivalent for NUnit&#39;s Parameterized Tests?

I am learning the concepts of Test-Driven Development through reading the [Craftsman articles][1] (click *Craftsman* under *By Topic*) recommended in an answer to my previous question, [&quot;Sample project for learning JUnit and proper software engineering&quot;][2]. I love it so far!

But now I want to sit down and try it myself. I have a question that I hope will need only a simple answer.

**How do you organize your JUnit test classes and your actual code?** I&#39;m talking mainly about the package structure, but any other concepts of note would be helpful too.

Do you put test classes in org.myname.project.test.* and normal code in org.myname.project.*? Do you put the test classes right alongside the normal classes? Do you prefer to prefix the class names with Test rather than suffix them?

I know this seems like the kind of thing I shouldn&#39;t worry about so soon, but I am a very organization-centric person. I&#39;m *almost* the kind of person that spends more time figuring out methods to keep track of what to get done, rather than actually getting things done.

And I have a project that is currently neatly divided up into packages, but the project became a mess. Instead of trying to refactor everything and write tests, I want to start fresh, tests first and all. But first I need to know where my tests go.

---

*edit:* I totally forgot about Maven, but it seems a majority of you are using it! In the past I had a specific use case where Maven completely broke down on me but Ant gave me the flexibility I needed, so I ended up attached to Ant, but I&#39;m thinking maybe I was just taking the wrong approach. I think I&#39;ll give Maven another try because it sounds like it will go well with test-driven development.

  [1]: http://www.objectmentor.com/resources/publishedArticles.html
  [2]: https://stackoverflow.com/questions/2376975/sample-project-for-learning-junit-and-proper-software-engineering

Separation of JUnit classes into special test package?

I&#39;m fond of the idea of unit testing but I&#39;m having trouble applying it to game programming. Games are highly stateful and often the code doesn&#39;t break itself into distinct units. In my experience, most functions mutate state rather than returning values.

Consider a simple action like `playerJump(height)`. I&#39;d love to have a test suite that checks a large variety of cases to make sure that jumping always works as expected. However this function will likely return no value and have the side effect of, `player.velocity.y = -height` and `checkCollisions(player)`. I can&#39;t think of a clear unit test to build around this.

Is unit testing just not viable in highly stateful applications like games? Are the advantages of unit testing so great that it would be worth programming games functionally?


----------

**Update:**

Games from Within has a series of in depth articles about using Test Driven Development in games. I highly recommend them to anybody interested in this subject. Here is the first article:

http://gamesfromwithin.com/stepping-through-the-looking-glass-test-driven-game-development-part-1


Is unit testing viable in game programming?

How do we add comments in erb files, if we do not want them to be generated into the html content? 

Best way to add comments in erb

How do you comment out html mixed with ruby code?

    some text &lt;% ... %&gt; more text &lt;%= ... %&gt;
    something else
    &lt;% ... %&gt;

In jsp it&#39;s real simple: `&lt;%-- ... --%&gt;`, but I&#39;m unable to find any concise option in rails.

Simple html comments `&lt;!-- ... --&gt;` do not work: ruby code is still executed and yells errors.  

There&#39;s an option to use `if false` with html comments, but it&#39;s quite verbose, not to mention IDEs doesn&#39;t support it.

There&#39;s also an option coming from pure ruby, which surprisingly works.

    &lt;%
    =begin %&gt;
    ... html and ruby code goes here
    &lt;%
    =end %&gt;

It&#39;s generally fine, except that it&#39;s verbose, weird-looking and none of ruby IDEs I know support it (yep, I like to comment/comment-out with one keystroke).

I&#39;m curious, is there any &#39;official&#39; of doing this in rails?

Thanks!

Block comments in html.erb templates in rails

Suppose I have the following string 

    @x = &quot;&lt;a href=&#39;#&#39;&gt;Turn me into a link&lt;/a&gt;&quot;

In my view, I want a link to be displayed. That is, I don&#39;t want everything in @x to be unescaped and displayed as a string. What&#39;s the difference between using

    &lt;%= raw @x %&gt;
    &lt;%= h @x %&gt;
    &lt;%= @x.html_safe %&gt;

?

raw vs. html_safe vs. h to unescape html

Why is the view of Rails application in the format `*.erb.html`? What does &quot;erb&quot; mean?

What is the meaning of erb?

I tried `:include_blank =&gt; true`, but it didn&#39;t work.

    &lt;select&gt;
        &lt;%= options_for_select Model.all.collect{|mt| [mt.name, mt.id]} %&gt;
    &lt;/select&gt;

If I need to add it to the collection, how would you do that?

Include blank for first item in select list in options_for_select tag

I&#39;m learning pytest and I lint my code with pylint.
But pylint still complaints about:  
`W0621: Redefining name %r from outer scope (line %s)`

for the following example from pytest:

    # test_wallet.py
    
    @pytest.fixture
    def my_wallet():
        &#39;&#39;&#39;Returns a Wallet instance with a zero balance&#39;&#39;&#39;
        return Wallet()
    
    @pytest.mark.parametrize(&quot;earned,spent,expected&quot;, [
        (30, 10, 20),
        (20, 2, 18),
    ])
    def test_transactions(my_wallet, earned, spent, expected):
        my_wallet.add_cash(earned)
        my_wallet.spend_cash(spent)
        assert my_wallet.balance == expected

Redefining name `my_wallet` from outer scope.

I found workaround to add `_` prefix to the fixture name: `_my_wallet`.

What would be the best practice if I want to keep fixtures in same file as functions?  

 1. Prepend all fixtures with `_`?
 2. Disable this `pylint` check for tests?
 3. Better suggestion?

Content Type	Original Author	Original Content on Stackoverflow
Question	Daniel	View Question on Stackoverflow
Solution 1 - Ruby on-Rails	molf	View Answer on Stackoverflow

How do I escape the ERB tag in ERB

Ruby on-Rails Problem Overview

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

How can I add a new column and data to a datatable that already contains data?

How to understand symbols in Ruby

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