`match` matches any http method/verb, while `get` matches only http method/verb GET.

Following two are equivalent:

    match &quot;/signup&quot; =&gt; &quot;users#new&quot;, :via =&gt; [:get]
    get   &quot;/signup&quot; =&gt; &quot;users#new&quot;

 

I wrote some statements like below:

    os.system(cmd) #do something
    subprocess.call(&#39;taskkill /F /IM exename.exe&#39;)

both will pop up a console.

How can I stop it from popping up the console?

How do I hide the console when I use os.system() or subprocess.call()?

I am trying to migrate a database where images were stored in the database to a record in the database pointing at a file on the hard drive. I was trying to use `Parallel.ForEach` to speed up the process [using this method][1] to query out the data.

However, I noticed that I was getting an `OutOfMemory` Exception. I know `Parallel.ForEach` will query a batch of enumerables to mitigate the cost of overhead if there is one for spacing the queries out (so your source will more likely have the next record cached in memory if you do a bunch of queries at once instead of spacing them out). The issue is due to one of the records that I am returning is a 1-4Mb byte array that caching is causing the entire address space to be used up (The program must run in x86 mode as the target platform will be a 32-bit machine)

Is there any way to disable the caching or make is smaller for the TPL?


----------
Here is an example program to show the issue. This must be compiled in the x86 mode to show the issue if it is taking to long or is not happening on your machine bump up the size of the array (I found `1 &lt;&lt; 20` takes about 30 secs on my machine and `4 &lt;&lt; 20` was almost instantaneous)

    class Program
    {
    
        static void Main(string[] args)
        {
            Parallel.ForEach(CreateData(), (data) =&gt;
                {
                    data[0] = 1;
                });
        }
    
        static IEnumerable&lt;byte[]&gt; CreateData()
        {
            while (true)
            {
                yield return new byte[1 &lt;&lt; 20]; //1Mb array
            }
        }
    }

  [1]: https://stackoverflow.com/questions/3096727/is-there-a-way-to-use-the-task-parallel-librarytpl-with-sqldatareader/3097049#3097049


Parallel.ForEach can cause a &quot;Out Of Memory&quot; exception if working with a enumerable with a large object

What would the difference be?

Example Match:&lt;br/&gt;
`match &#39;photos/show&#39; =&gt; &#39;photos#show&#39;`

Example Get:&lt;br/&gt;
`get &#39;photos/show&#39;`

Wouldn&#39;t both make it possible to reach the photos/show URL and also use the show action in the photos controller?

Thanks

Ruby on Rails Routes - difference between get and match

What would the difference be?
Example Match: 
<code>match 'photos/show' => 'photos#show'</code>
Example Get: 
<code>get 'photos/show'</code>
Wouldn't both make it possible to reach the photos/show URL and also use the show action in the photos controller?
Thanks

A `Person` can have many `Events` and each `Event` can have one polymorphic `Eventable` record.  How do I specify the relationship between the `Person` and the `Eventable` record?

Here are the models I have:

    class Event &lt; ActiveRecord::Base
      belongs_to :person
      belongs_to :eventable, :polymorphic =&gt; true
    end
    
    class Meal &lt; ActiveRecord::Base
      has_one :event, :as =&gt; eventable
    end
   
    class Workout &lt; ActiveRecord::Base
      has_one :event, :as =&gt; eventable
    end

The main question concerns the `Person` class:

    class Person &lt; ActiveRecord::Base
      has_many :events
      has_many :eventables, :through =&gt; :events  # is this correct???
    end

Do I say `has_many :eventables, :through =&gt; :events` like I did above?

Or do I have to spell them all out like so:

    has_many :meals, :through =&gt; :events
    has_many :workouts, :through =&gt; :events

If you see an easier way to accomplish what I&#39;m after, I&#39;m all ears! :-)


Rails: has_many through with polymorphic association - will this work?

Using this modified example from [the Rails guides][1], how does one model a relational &quot;has_many :through&quot; association using mongoid?

The challenge is that mongoid does not support has_many :through as ActiveRecord does.

    # doctor checking out patient
    class Physician &lt; ActiveRecord::Base
      has_many :appointments
      has_many :patients, :through =&gt; :appointments
      has_many :meeting_notes, :through =&gt; :appointments
    end
    
    # notes taken during the appointment
    class MeetingNote &lt; ActiveRecord::Base
      has_many :appointments
      has_many :patients, :through =&gt; :appointments
      has_many :physicians, :through =&gt; :appointments
    end
    
    # the patient
    class Patient &lt; ActiveRecord::Base
      has_many :appointments
      has_many :physicians, :through =&gt; :appointments
      has_many :meeting_notes, :through =&gt; :appointments
    end
     
    # the appointment
    class Appointment &lt; ActiveRecord::Base
      belongs_to :physician
      belongs_to :patient
      belongs_to :meeting_note
      # has timestamp attribute
    end


  [1]: http://guides.rubyonrails.org/association_basics.html#the-has-many-through-association

How to implement has_many :through relationships with Mongoid and mongodb?

I want to truncate a string as follows:

**input:**

    string = &quot;abcd asfsa sadfsaf safsdaf aaaaaaaaaa aaaaaaaaaa dddddddddddddd&quot;

**output:**

    string = &quot;abcd asfsa sadfsaf safsdaf aa...ddddd&quot;

Truncate string with Rails?

I am currently working on a Rails 3 project that is divided up into four parts:

 - The public facing website
 - The administration website/backend
 - The models
 - The API for third party data access

As the models are shared between the three key components I want to keep them away from being in one main project, however each part needs access to the models, but I don&#39;t want to repeat the code and have different versions everywhere.

Currently I have the model code in a gem, and in each project&#39;s Gemfile I am referencing them with the following line:

    gem &quot;my_models&quot;, :path =&gt; &quot;../my_models/&quot;

However when I deploy to our test servers for my co-workers to evaluate the system on I need to pull the models from an external repository, so I swap out the above line with the following:

    gem &quot;my_models&quot;, :git =&gt; &quot;git@private.repository.com:username/my_models.git&quot;

This in its self works well, but its quite clunky in terms of &#39;versions&#39; (i.e. I need to bump the version every time I wish to deploy the changes to the test servers), switch the line over to use git instead of local, and make sure that I&#39;m pushing the files properly.

Previously I was using a shared git submodule, but this was just as awkward.

I would rather not build everything into one mega-project, as these tend to become monstrous and difficult to maintain, and I would also like to separate concerns if possible, so any changes I make to the administration site doesn&#39;t have much of a chance to impact the other components - obviously the models have the potential to cause issues, but that is a risk I have considered and understand.

What would people out there suggest when it comes to something like this? Or, am I going about it completely the wrong way?

*Some additional background:*

This app is a rewrite of an existing website which followed the model of &#39;lump everything into the one project&#39; - unfortunately there are two issues here:

 1. The app was badly developed - I inherited this project and when I first picked it up the load times were ~2 minutes per page with a single user - this has since been reduced but still has issues throughout
 2. We are currently at our capacity limit of the current site and we anticipate that we will need to take on more load in the next 6 months - however scaling out with an &#39;all in one&#39; app means we&#39;ll be wasting resources on scaling out the back end of the site which doesn&#39;t need it.

Essentially there are two things I want to separate - the Front end (being the public website and the API) and the back end - everything I know about software development tells me that combining all this together is not an ideal solution (and past history shows me that splitting these two is a good move in terms of ensuring front end performance).

Perhaps I need to look at this from another angle - keep the models in each project, and instead of sharing them between projects have a cut-down subset of functionality for each functional area (i.e. the backend needs to know who created a post, but the front end doesn&#39;t really care about that, so omit that logic when reading in the model).

Shared models between two Rails apps - what is the ideal solution for Workflow?

According to &quot;[Custom Rake Tasks][1]&quot;:

    desc &quot;Pick a random user as the winner&quot;
    task :winner =&gt; :environment do
      puts &quot;Winner: #{pick(User).name}&quot;
    end

As far as I know, the `:winner =&gt; :environment` means &quot;do `environment` before `winner`&quot;. But what&#39;s `environment`? When should I use it?

I tried `rake -T`, but in the list I couldn&#39;t find `environment`.

[1]: http://railscasts.com/episodes/66-custom-rake-tasks

What&#39;s the &#39;environment&#39; task in Rake?

My app is using Rails 3.0.4 and Devise 1.1.7.

I&#39;m looking for a way to prevent users from sharing accounts as the app is a subscription based service.  I&#39;ve been searching for over a week, and I still don&#39;t know how to implement a solution.  I&#39;m hoping someone has implemented a solution and can point me in the right direction.   

**Solution** (Thank you everyone for your answers and insight!)

In application controller.rb

    before_filter :check_concurrent_session

    def check_concurrent_session
      if is_already_logged_in?
        sign_out_and_redirect(current_user)
      end
    end

    def is_already_logged_in?
      current_user &amp;&amp; !(session[:token] == current_user.login_token)
    end

In session_controller that overrides Devise Sessions controller:

    skip_before_filter :check_concurrent_session
    
    def create
      super
      set_login_token
    end
    
    private
    def set_login_token
      token = Devise.friendly_token
      session[:token] = token
      current_user.login_token = token
      current_user.save
    end

In migration AddLoginTokenToUsers

    def self.up
      change_table &quot;users&quot; do |t|
        t.string &quot;login_token&quot;
      end
    end

    def self.down
      change_table &quot;users&quot; do |t|
        t.remove &quot;login_token&quot;
      end
    end


Devise limit one session per user at a time

I created a new Rails project using `rails 3.1.0.rc4` on my local machine but when I try to start the server I get:
Could not find a JavaScript runtime. See [here][1] for a list of available runtimes. (`ExecJS::RuntimeUnavailable`)

Note: This is not about Heroku.


  [1]: https://github.com/sstephenson/execjs

Rails - Could not find a JavaScript runtime?

I am using [ActiveAdmin][1] gem in my project.

I have 2 models using has_many through association. The database schema looks exactly the same as the example in RailsGuide. [http://guides.rubyonrails.org/association_basics.html#the-has_many-through-association][2]
[![has_many through association][3]][3]  
&lt;sub&gt;(source: [rubyonrails.org](http://guides.rubyonrails.org/images/has_many_through.png))&lt;/sub&gt;  



How can I use ActiveAdmin to ...

 1. show appointment date of each patient in physicians page?
 2. edit appointment date of each patient in physicians page?


Thanks all. :)
 

  [1]: https://activeadmin.info/
  [2]: https://guides.rubyonrails.org/association_basics.html#the-has_many-through-association
  [3]: https://i.stack.imgur.com/qaWFh.png

How to use ActiveAdmin on models using has_many through association?

This query 

    Message.where(&quot;message_type = ?&quot;, &quot;incoming&quot;).group(&quot;sender_number&quot;).count
     
will return me an hash.

    OrderedHash {&quot;1234&quot;=&gt;21, &quot;2345&quot;=&gt;11, &quot;3456&quot;=&gt;63, &quot;4568&quot;=&gt;100}

Now I want to order by count of each group. How can I do that within the query.



&quot;Order by&quot;  result of  &quot;group by&quot; count?

I want to use a column called `type` without invoking Single Table Inheritance (STI) - I just want `type` to be a normal column that holds a `String`.

How can I do this without having Rails expecting me to have single table inheritance and throwing an exception of `The single-table inheritance mechanism failed to locate the subclass...This error is raised because the column &#39;type&#39; is reserved for storing the class in case of inheritance.`?

Any ideas on how to do this?

Content Type	Original Author	Original Content on Stackoverflow
Question	EverTheLearner	View Question on Stackoverflow
Solution 1 - Ruby on-Rails	rubish	View Answer on Stackoverflow

Ruby on Rails Routes - difference between get and match

Ruby on-Rails Problem Overview

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

Parallel.ForEach can cause a "Out Of Memory" exception if working with a enumerable with a large object

How do I hide the console when I use os.system() or subprocess.call()?

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