In Yaml, `~` means null. (*[source](http://yaml4r.sourceforge.net/doc/page/basic_types_in_yaml.htm)*)

The actual meaning in Symfony 2 depends on what you are configuring. Most likely it will mean &quot;use defaults&quot; or it will be used where it is needed to put a configuration key but there is nothing to actually configure for that key (as in the NotBlank example).


For a simple web app that needs to refresh parts of data presented to the user in set intervals, are there any downsides to just using `setInterval()` to get a JSON from an endpoint instead of using a proper polling framework?

For the sake of an example, let&#39;s say I&#39;m refreshing the status of a processing job every 5 seconds.

Using setInterval() to do simplistic continuous polling

I&#39;m unable to ssh and rysnc to a remote system. It keeps giving this error message:




    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     
          
    IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
    Someone could be eavesdropping on you right now (man-in-the-middle attack)!
    It is also possible that a host key has just been changed.
    The fingerprint for the RSA key sent by the remote host is
    a3:8f:7c:07:c9:12:d8:aa:cd:c2:ba:b3:27:68:bc:c2.
    Please contact your system administrator.
    Add correct host key in /root/.ssh/known_hosts to get rid of this message.
    Offending RSA key in /root/.ssh/known_hosts:8
    RSA host key for xxx.xxx.xxx.xxx has changed and you have requested strict checking.
    Host key verification failed.
    rsync: connection unexpectedly closed (0 bytes received so far) [sender]
    rsync error: unexplained error (code 255) at io.c(601) [sender=3.0.8]

I&#39;ve removed `authorized_keys` file from `/home/user/.ssh`.

Ubuntu-ssh - - WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED

What does ~ mean in the YML configuration file in Symfony 2?

For example:

    NotBlank: ~

What does ~ mean in the YML configuration file in Symfony 2?

What does ~ mean in the YML configuration file in Symfony 2?
For example:
<pre><code class="hljs language-makefile">NotBlank: ~
</code></pre>

I have a form containing several fields. One of them is a Datetime field. How to define a default value for that field? 

I&#39;ve tried setting a value on the related entity, in controller, in constructor and __construct :

    $myEntity = new MyEntity();
    $myEntity-&gt;setMyDate(new \DateTime());
    $form = $this-&gt;createForm(new AddMyEntity(), $myEntity);

Not working. 


Tried to define the `$data` variable in the buildForm : 


    $builder-&gt;add(&#39;myDate&#39;, &#39;date&#39;, array(
        &#39;format&#39; =&gt; \IntlDateFormatter::SHORT,
        &#39;input&#39; =&gt; &#39;datetime&#39;,
        &#39;widget&#39; =&gt; &#39;single_text&#39;,
        &#39;data&#39; =&gt; new \DateTime(&quot;now&quot;));

Not working either. 
Any ideas, Symfony2 community?


EDIT : Adding entity on demand of faost. 

    /**
     * @ORM\Column(name=&quot;myDate&quot;, type=&quot;datetime&quot;)
     * @Assert\NotBlank()
     */
    private $myDate;

Set default value on Datetime field in symfony2 form

It&#39;s not adding anything and it makes the page slower and I want it gone. Don&#39;t ask. There&#39;s little about the profiler on the website and nothing in the app config.

How do I disable the Symfony 2 profiler bar?

I have Symfony 2.0.9 standard edition installed with JMSSecurityBundle.  Just wondering what functions are available to me in a Twig template to deal with users?

Specifically I want check to see if a user has the role ROLE_ADMIN.

Any help?

Thanks

Symfony2 security functions in Twig? How to check the user&#39;s role?

I need to generate some JSON content in controller and I need to get the full URL to an uploaded image situated here : `/web/uploads/myimage.jpg`.

How can I get the full url of it? 

`http://www.mywebsite.com/uploads/myimage.jpg`

How to get the full url for an asset in Controller?

I only want to have email as mode of login, I don&#39;t want to have username. Is it possible with symfony2/symfony3 and FOSUserbundle?

I read here http://groups.google.com/group/symfony2/browse_thread/thread/92ac92eb18b423fe

But then I am stuck with two constraint violations.

Problem is if the user leaves the email address blank, I get two constraint
violations:

 * Please enter a username
 * Please enter an email

Is there a way to disable validation for a given field, or a better way to
remove a field from the form altogether? 

Remove / Replace the username field with email using FOSUserBundle in Symfony2 / Symfony3

I have the following developement section of my `development.yml` file:

    development:
      adapter: postgresql
      host: localhost
      database: testtb
      username: app_user
      password: ENV[&#39;APP_USER_POSTGRES_PASSWORD&#39;]     &lt;= Troublesome line

When I open a rails console via `bundle exec rails console` and type `ENV[&#39;APP_USER_POSTGRES_PASSWORD&#39;]` I get back the DB password I&#39;ve specified in my local profile. However, when I start my rails server, it can&#39;t connect to the DB, failing with 

    PGError FATAL:  password authentication failed for user &quot;app_user&quot;

This was previously working when I had the DB password actually typed out in plain text, rather than trying to access it via `ENV[&#39;...&#39;]`, but for obvious reasons I want to keep the actual password out of this file entirely (and therefore out of the code repository) while still being able to commit other, non-secure changes to the `database.yml` file.

**Is there something special about the syntax I&#39;m missing**, or are the environment variables for some reason not available when the `database.yml` file is being loaded?

Failing to access environment variables within `database.yml` file

So, I know I can do something like this:

    sitelist: &amp;sites
      - www.foo.com
      - www.bar.com

    anotherlist: *sites

And have `sitelist` and `anotherlist` both contain `www.foo.com` and `www.bar.com`. However, what I really want is for `anotherlist` to *also* contain `www.baz.com`, without having to repeat `www.foo.com` and `www.baz.com`.

Doing this gives me a syntax error in the YAML parser:

    sitelist: &amp;sites
      - www.foo.com
      - www.bar.com

    anotherlist: *sites
      - www.baz.com

Just using anchors and aliases it doesn&#39;t seem possible to do what I want without adding another level of substructure, such as:

    sitelist: &amp;sites
      - www.foo.com
      - www.bar.com

    anotherlist:
      - *sites
      - www.baz.com

Which means the consumer of this YAML file has to be aware of it.

Is there a pure YAML way of doing something like this? Or will I have to use some post-YAML processing, such as implementing variable substitution or auto-lifting of certain kinds of substructure? I&#39;m already doing that kind of post-processing to handle a couple of other use-cases, so I&#39;m not totally averse to it. But my YAML files are going to be written by humans, not machine generated, so I would like to minimise the number of rules that need to be memorised by my users on top of standard YAML syntax.

I&#39;d also like to be able to do the analogous thing with maps:

    namedsites: &amp;sites
      Foo: www.foo.com
      Bar: www.bar.com

    moresites: *sites
      Baz: www.baz.com

I&#39;ve had a search through the [YAML spec][1], and couldn&#39;t find anything, so I suspect the answer is just &quot;no you can&#39;t do this&quot;. But if anyone has any ideas that would be great.

---

**EDIT:** Since there have been no answers, I&#39;m presuming that no one has spotted anything I haven&#39;t in the YAML spec and that this can&#39;t be done at the YAML layer. So I&#39;m opening up the question to idea for post-processing the YAML to help with this, in case anyone finds this question in future.


  [1]: http://www.yaml.org/spec/1.2/spec.html

Is there YAML syntax for sharing part of a list or map?

I am writing a fixture for my table. And a one of the coloums takes in a JSON string as a value.

The problem is the fixture is not loading failing as:

    Fixture::FormatError: a YAML error occurred parsing /home/saurajeet/code/dcbox/test/fixtures/hardware.yml. Please note that YAML must be consistently indented using spaces. Tabs are not allowed. Please have a look at http://www.yaml.org/faq.html
    The exact error was:
      ArgumentError: syntax error on line 145, col 73: `  portslist: [{&quot;name&quot;:&quot;ob1&quot;,&quot;port_num&quot;:0,&quot;port_type&quot;:&quot;network&quot;},{&quot;name&quot;:&quot;ob2&quot;,&quot;port_nu&#39;.....

Any solutions to this.

    



Embedding JSON Data into YAML file

I started populating an en yaml file in Rails and I can already tell it will get messy and out of hand before too long. Is there a convention to keeping this file organized?

So far I have this structure:

    language:
      resource:
        pages: # index, show, new, edit
          page html elements: # h1, title
      activerecord:
        attributes:
          model:
            property:

Now I have the following things that I want to fit into this structure but I&#39;m unsure how to:

 1. Navigation
 2. Button text (save changes, create account, etc)
 3. Error messages from controller flash
 4. How to add multi-word keys. Do I use a space or an underscore? For exmaple, `t(&quot;.update button&quot;)`) or `t(&quot;.update_button&quot;)`

Is there a convention to locale file structure?

How do you structure i18n yaml files in Rails?

I want to upload an app to Google App Engine:

I get this

    Error parsing yaml file:
    mapping values are not allowed here
      in &quot;/home/antonio/Desktop/ATI/climate-change/app.yaml&quot;, line 2, column 8 

When running

    ./appcfg.py update /home/antonio/Desktop/ATI/climate-change


with this app.yaml file:

    application:climate-change
    version: 1
    runtime: python27
    api_version: 1
    threadsafe: true
    
    handlers:
    - url: /.*
      script: helloworld.app

line 2, column 8 corresponds to the version line. What is wrong here? Btw, I&#39;m using Ubuntu 12.04 here. 

Content Type	Original Author	Original Content on Stackoverflow
Question	Tuong Le	View Question on Stackoverflow
Solution 1 - Symfony	Aldo Stracquadanio	View Answer on Stackoverflow

What does ~ mean in the YML configuration file in Symfony 2?

Symfony Problem Overview

Symfony Solutions

Solution 1 - Symfony

Ubuntu-ssh - - WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED

Using setInterval() to do simplistic continuous polling

Attributions