ActiveSupport is more separate now in Rails 3.

If you want the all active_support thing, you can `require &#39;active_support/all&#39;` now.

But if you want only the `blank?` method, you can try 

    require &#39;active_support/core_ext/string&#39;

1. Can the JVM recover from an `OutOfMemoryError` without a restart if it gets a chance to run the GC before more object allocation requests come in?

2. Do the various JVM implementations differ in this aspect?

My question is about the JVM recovering and not the user program trying to recover by catching the error. In other words if an OOME is thrown in an application server (jboss/websphere/..) do I **have** to restart it? Or can I let it run if further requests seem to work without a problem.


Can the JVM recover from an OutOfMemoryError without a restart

I would like to add custom (non-project) files to generate some extra pages with [Doxygen][1].

I am (was actually) unsure how these files should be named and how their content should be formatted.

  [1]: http://www.doxygen.nl/

How to include custom files in Doxygen

I&#39;m having a problem using ActiveSupport&#39;s core extensions on a gem I am developing.

I had it working with AS 2.3.8, but as soon as I wanted to port it to 3b4, the extensions stopped working and my test results are filled with lines such as: 

    undefined method `blank?&#39; for &quot;something&quot;:String

I&#39;ve included it via 

    gem &quot;activesupport&quot;

followed by

    require &quot;active_support&quot;

Is there anything else I need to call to include those extensions?



How to use Rails 3&#39;s ActiveSupport core extensions outside Rails

I'm having a problem using ActiveSupport's core extensions on a gem I am developing.
I had it working with AS 2.3.8, but as soon as I wanted to port it to 3b4, the extensions stopped working and my test results are filled with lines such as:
<pre><code class="hljs language-rust">undefined method `blank?' for "something":String
</code></pre>
I've included it via
<pre><code class="hljs language-arduino">gem "activesupport"
</code></pre>
followed by
<pre><code class="hljs language-javascript">require "active_support"
</code></pre>
Is there anything else I need to call to include those extensions?

All I want to do is get all the content from a local file and store it in a variable. How?

`File.read(@icon.full_filename).each {|l| r += l}`

only gives me a part of it. In PHP, I just used `file_get_contents`.

Read contents of a local file into a variable in Rails

I have a model that has an attribute that is an Array. What&#39;s the proper way for me to populate that attribute from a form submission?

I know having a form input with a field whose name includes brackets creates a hash from the input. Should I just be taking that and stepping through it in the controller to massage it into an array?

Example to make it less abstract:

    class Article
      serialize :links, Array
    end

The links variable takes the form of a an array of URLs, i.e. `[[&quot;http://www.google.com&quot;], [&quot;http://stackoverflow.com&quot;]]`

When I use something like the following in my form, it creates a hash:
    
    &lt;%= hidden_field_tag &quot;article[links][#{url}]&quot;, :track, :value =&gt; nil %&gt;

The resultant hash looks like this: 

    &quot;links&quot; =&gt; {&quot;http://www.google.com&quot; =&gt; &quot;&quot;, &quot;http://stackoverflow.com&quot; =&gt; &quot;&quot;}

If I don&#39;t include the url in the name of the link, additional values clobber each other:
    
    &lt;%= hidden_field_tag &quot;article[links]&quot;, :track, :value =&gt; url %&gt;

The result looks like this: `&quot;links&quot; =&gt; &quot;http://stackoverflow.com&quot;`

Ruby on Rails: Submitting an array in a form

&gt; **Possible Duplicate:**  
&gt; [Naming Boolean columns in Rails](https://stackoverflow.com/questions/1524154/naming-boolean-columns-in-rails)  

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

What is the rails convention regarding names of boolean fields?

For example, if I have a `User` model that needs a flag for its &quot;activeness&quot;, should I call the db field `is_active` or `active` ?

Note: Rails automatically generates question-marked methods for accessing boolean fields: `User.is_active?` and `User.active?`.

rails boolean fields: `is_foo` or just `foo`?

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

I&#39;ve read [this][1], but I&#39;m new to RoR so I&#39;m having a little trouble understanding it. I&#39;m using a form to create a new request record, and all of the variables that I need to send exist already. Here is the data I need to send (this is in a do loop):

    :user_id =&gt; w[:requesteeID]
    :requesteeName =&gt; current_user.name
    :requesteeEmail =&gt; current_user.email
    :info =&gt; e

Here&#39;s my form, which works so far, but only send NULL values for everything:

    &lt;% form_for(:request, :url =&gt; requests_path) do |f| %&gt;
    	&lt;div class=&quot;actions&quot;&gt;
    		&lt;%= f.submit e %&gt;
    	&lt;/div&gt;
    &lt;% end %&gt;

How do I use hidden_fields to send the data I already have? Thanks for reading.


  [1]: http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#M002295

Rails: How do I use hidden_field in a form_for?

I&#39;ve been using compass from http://compass-style.org/ to manage my sites css for a long time. I just installed the newest version and I get a rather unpleasant error, that has as a side effect corrupted all my css files. How do I downgrade to an older version of this?

Thanks,
Matt

How do I downgrade to an old version of compass using gem install?

Delayed::Job&#39;s auto-retry feature is great, but there&#39;s a job that I want to manually retry now. Is there a method I can call on the job itself like...

    Delayed::Job.all[0].perform

or run, or something. I tried a few things, and combed the documentation, but couldn&#39;t figure out how to execute a manual retry of a job.





Manually Retry Job in Delayed_job

I&#39;m trying to edit one of the gem&#39;s config files and I can&#39;t find it. I&#39;m not sure how I did this in the past.

Where do gems install?

What&#39;s the meaning of `~&gt;` version requirement in gem specs? 

&lt;pre&gt;
hanna-0.1.12 depends on [haml (~&gt; 2.2.8)]
&lt;/pre&gt;

Meaning of tilde-greater-than (~&gt;) in version requirement?

How can I remove RVM (Ruby Version Manager) from my system?

How to remove RVM (Ruby Version Manager) from my system

I am wanting to test a function on one of my models that throws specific errors.  The function looks something like this:

    def merge(release_to_delete)
      raise &quot;Can&#39;t merge a release with itself!&quot; if( self.id == release_to_delete.id )
      raise &quot;Can only merge releases by the same artist&quot; if( self.artist != release_to_delete.artist   )
      #actual merge code here
    end

Now I want to do an assert that when I call this function with a parameter that causes each of those exceptions, that the exceptions actually get thrown.  I was looking at ActiveSupport documentation, but I wasn&#39;t finding anything promising.  Any ideas?

Rails ActiveSupport: How to assert that an error is raised?

I have Active Support 3.0.3 installed and Rails 3.0.3 with Ruby 1.8.7.

When I try to use `1.week.ago` I get 

    NoMethodError: undefined method &#39;week&#39; for 1:Fixnum
    from (irb):2

The other core extensions seem to work. I tried it on a friend&#39;s computer (same install specs and legacy versions are on his) with the same results.

What gives?

All of this is in IRB.


How to use Active Support core extensions

I tried doing something like 

    Time.now + 5.days

but that doesn&#39;t work, even though I vaguely remember seeing, and being very impressed, with being able to do something like `2.years` etc. 

How do I do that in Rails 3?


How to add 10 days to current time in Rails

I&#39;m having trouble converting a UTC `Time` or `TimeWithZone` to local time in Rails 3.

Say `moment` is some `Time` variable in UTC (e.g. `moment = Time.now.utc`). How do I convert `moment` to my time zone, taking care of DST (i.e. using EST/EDT)?

More precisely, I&#39;d like to printout &quot;Monday March 14, 9 AM&quot; if the time correspond to this morning 9 AM EDT and &quot;Monday March 7, 9 AM&quot; if the time was 9 AM EST last monday.

Hopefully there&#39;s another way?

**Edit**: [I first thought][1] that &quot;EDT&quot; should be a recognized timezone, but &quot;EDT&quot; is not an actual timezone, more like the state of a timezone. For instance it would not make any sense to ask for `Time.utc(2011,1,1).in_time_zone(&quot;EDT&quot;)`. It is a bit confusing, as &quot;EST&quot; **is** an actual timezone, used in a few places that do not use Daylight savings time and are (UTC-5) yearlong.


  [1]: https://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/6574

Convert UTC to local time in Rails 3

So in Rails 3.2, ActiveSupport::Memoizable has been deprecated.

The message reads:

    DEPRECATION WARNING: ActiveSupport::Memoizable is deprecated and
    will be removed in future releases,simply use Ruby memoization
    pattern instead.

It refers to &quot;Ruby memoization pattern&quot; (singular) as if there&#39;s one pattern we should all know and refer to...

I presume they mean something like:

    def my_method
      @my_method ||= # ... go get the value
    end

or 
    
    def my_method
      return @my_method if defined?(@my_method)

      @my_method = # ... go get the value
    end

Is there something else I&#39;ve missed?

Content Type	Original Author	Original Content on Stackoverflow
Question	changelog	View Question on Stackoverflow
Solution 1 - Ruby on-Rails	shingara	View Answer on Stackoverflow

How to use Rails 3's ActiveSupport core extensions outside Rails

Ruby on-Rails Problem Overview

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

How to include custom files in Doxygen

Can the JVM recover from an OutOfMemoryError without a restart

Attributions