You can add the `:status` option

    def permission_denied
      render :file =&gt; &quot;public/401.html&quot;, :status =&gt; :unauthorized
    end

Here so you don&#39;t have to dig through comments for a modern answer. 

The previous answer has been deprecated in Rails 5.1

Throw any of these into your controller action:

## Render A File/Template

```ruby
render :file =&gt; &quot;public/401&quot;, :status =&gt; :unauthorized
```

## Render JSON

```ruby
render status: :unauthorized, json: { error: &quot;You are not authorized to access this resource. Verify that you are passing passing your token.&quot; }
```

## Render Nothing

```ruby
head :unauthorized
```

[See ActionController#head][1]


  [1]: https://edgeapi.rubyonrails.org/classes/ActionController/Head.html#method-i-head

I like MVVM. I don&#39;t love it, but like it. Most of it makes sense. But, I keep reading articles that encourage you to write a lot of code so that you can write XAML and don&#39;t have to write any code in the code-behind.

Let me give you an example.

Recently I wanted to hookup a command in my ViewModel to a ListView MouseDoubleClickEvent. I wasn&#39;t quite sure how to do this. Fortunately, Google has answers for everything. I found the following articles:

 - http://blog.functionalfun.net/2008/09/hooking-up-commands-to-events-in-wpf.html
 - http://joyfulwpf.blogspot.com/2009/05/mvvm-invoking-command-on-attached-event.html
 - http://sachabarber.net/?p=514
 - http://geekswithblogs.net/HouseOfBilz/archive/2009/08/27/adventures-in-mvvm-ndash-binding-commands-to-any-event.aspx
 - http://marlongrech.wordpress.com/2008/12/13/attachedcommandbehavior-v2-aka-acb/
 
While the solutions were helpful in my understanding of commands, there were problems. Some of the aforementioned solutions rendered the WPF designer unusable because of a common hack of appending &quot;Internal&quot; after a dependency property; the WPF designer can&#39;t find it, but the CLR can. Some of the solutions didn&#39;t allow multiple commands to the same control. Some of the solutions didn&#39;t allow parameters.

After experimenting for a few hours I just decided to do this:

    private void ListView_MouseDoubleClick(object sender, MouseButtonEventArgs e) {
        ListView lv = sender as ListView;
        MyViewModel vm = this.DataContext as MyViewModel;

        vm.DoSomethingCommand.Execute(lv.SelectedItem);
    }


So, MVVM purists, please tell me what&#39;s wrong with this? I can still Unit test my command. This seems very practical, but seems to violate the guideline of &quot;ZOMG... you have code in your code-behind!!!!&quot; Please share your thoughts.

Thanks in advance.


 

MVVM Madness: Commands

I have trouble with deleting all of layer&#39;s sublayers. I currently do this manually, but that brings unnecessary clutter. I found many topics about this in google, but no answer.

I tried to do something like this:

&lt;pre&gt;
for(CALayer *layer in rootLayer.sublayers)
{
    [layer removeFromSublayer];
}
&lt;/pre&gt;

but it didn&#39;t work.

Also, i tried to clone rootLayer.sublayers into separate NSArray, but result was the same.

Any ideas?

Edit:

I thought it works now, but I was wrong. It works good with CALayers, but it doesn&#39;t work with CATextLayers. Any ideas?

Removing all CALayer&#39;s sublayers

I&#39;d like to return a HTTP 401 error as part of my `permission_denied` method for [declarative_authorization][1].

    # triggered when a user accesses a page that they don&#39;t have access to
    def permission_denied
      # render my default 401 error page?
    end

How would I do this? (Pardon the question if it&#39;s stupid... I know how to render the 401.html page in my public directory, but I don&#39;t think it returns the 401 HTTP header, which is what I&#39;m after.)


  [1]: http://github.com/stffn/declarative_authorization

Rails: Return a 401?

I'd like to return a HTTP 401 error as part of my <code>permission_denied</code> method for <a href="http://github.com/stffn/declarative_authorization" target="_blank" rel="noopener noreferrer">declarative_authorization</a>.
<pre><code class="hljs language-ruby"># triggered when a user accesses a page that they don't have access to
def permission_denied
 # render my default 401 error page?
end
</code></pre>
How would I do this? (Pardon the question if it's stupid... I know how to render the 401.html page in my public directory, but I don't think it returns the 401 HTTP header, which is what I'm after.)

Is there an easy way to create a sitemaps file for Rails projects? Especially for dynamic sites (such as Stack Overflow for example) there should be a way to dynamically create a sitemaps file. What is the way to go in Ruby and/or Rails? 

What would you suggest? Is there any good gem out there?

Google sitemap files for Rails projects

I have a model that uses a serialized column:

    class Form &lt; ActiveRecord::Base
      serialize :options, Hash
    end

Is there a way to make this serialization use JSON instead of YAML?
  


ActiveRecord serialize using JSON instead of YAML

Suppose you&#39;re in your users controller and you want to get a json response for a show request, it&#39;d be nice if you could create a file in your views/users/ dir, named show.json and after your users#show action is completed, it renders the file.

Currently you need to do something along the lines of:

    def show
      @user = User.find( params[:id] )
      respond_to do |format|
        format.html
        format.json{
          render :json =&gt; @user.to_json
        }
      end
    end

But it would be nice if you could just create a show.json file which automatically gets rendered like so:

    def show
      @user = User.find( params[:id] )
      respond_to do |format|
        format.html
        format.json
      end
    end

This would save me tons of grief, and would wash away that horribly dirty feeling I get when I render my json in the controller

In Rails, how do you render JSON using a view?

In rails, on can show the active routes with rake ([http://guides.rubyonrails.org/routing.html][1]):

    $ rake routes
              users GET  /users          {:controller=&gt;&quot;users&quot;, :action=&gt;&quot;index&quot;}
    formatted_users GET  /users.:format  {:controller=&gt;&quot;users&quot;, :action=&gt;&quot;index&quot;}
                    POST /users          {:controller=&gt;&quot;users&quot;, :action=&gt;&quot;create&quot;}
                    POST /users.:format  {:controller=&gt;&quot;users&quot;, :action=&gt;&quot;create&quot;}

Is there a similar tool/command for django showing the e.g. the URL pattern, the name of the pattern (if any) and the associated function in the views?

  [1]: http://guides.rubyonrails.org/routing.html

Is there something similar to &#39;rake routes&#39; in django?

I want to simply check if a returned value from a form text field is a number i.e.: 12 , 12.5 or 12.75. Is there a simple way to check this, especially if the value is pulled as a `param`?

How can I check if a value is a number?

What does the following HTTP 1.1 header mean?

&gt; If-None-Match: *

I understand it when using a strong or weak ETag or even a list of ETags, but I don&#39;t understant it&#39;s use when using star (*).

**Edit:** Would be nice to have some pseudocode (PHP code good also) that would show how/what to answer to &quot;If-None-Match: *&quot;.

What does the HTTP header If-None-Match: * mean?

Can anyone show me how to do a PHP cURL with an HTTP POST?

I want to send data like this:

    username=user1, password=passuser1, gender=1

To `www.example.com`

I expect the cURL to return a response like `result=OK`.  Are there any examples?

PHP, cURL, and HTTP POST example?

There are four common protocols for network access of SVN.

    svn://repos
    svn+ssh://repos
    https://repos
    http://repos

The Wikipedia page doesn&#39;t say much about the differences of the four different protocols. I&#39;ve always preferred `svn://`, because it is the easiest to set up, but what is the difference and which one is &quot;better&quot;?


Which protocol? svn:// or http(s)://?

Can cookies set using HTTP be read using HTTPS?

Reading cookies via HTTPS that were set using HTTP

After reading a lot about the differences between REST and SOAP, I got the impression that REST is just another word for HTTP. Can someone explain what functionality REST adds to HTTP?

&lt;b&gt;Note&lt;/b&gt;: I&#39;m not looking for a comparison of REST versus SOAP.


Content Type	Original Author	Original Content on Stackoverflow
Question	neezer	View Question on Stackoverflow
Solution 1 - Ruby on-Rails	Garrett	View Answer on Stackoverflow
Solution 2 - Ruby on-Rails	CTS_AE	View Answer on Stackoverflow

Rails: Return a 401?

Ruby on-Rails Problem Overview

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

Solution 2 - Ruby on-Rails

Render A File/Template

Render JSON

Render Nothing

Removing all CALayer's sublayers

MVVM Madness: Commands

Attributions