If [DEBUG][1] is enabled, there&#39;s a [template tag][2] called [{% debug %}][3]


  [1]: http://docs.djangoproject.com/en/dev/ref/settings/#debug
  [2]: http://docs.djangoproject.com/en/dev/ref/templates/builtins/
  [3]: http://docs.djangoproject.com/en/dev/ref/templates/builtins/#debug

There are several options (some of them already listed before):

1. django builtin [debug tag][1] - I use this boilerplate to display it properly:

  &gt;    &amp;lt;pre&amp;gt;
    {% filter force_escape %}
    {% debug %}
    {% endfilter %}
  &gt;    &amp;lt;/pre&amp;gt;

2. Use [django template debug][2] application&#39;s tags like [attributes, variables and details][3] or you can even [set a breakpoint][4] inside of a template where you can inspect everything with [pdb][5] debugger (or ipdb)

3. [Django debug toolbar][6] - has a [template panel][7] for this purpose

Usually all debug features work only when the app is in [DEBUG][8] mode.


  [1]: http://docs.djangoproject.com/en/dev/ref/templates/builtins/#debug
  [2]: https://github.com/calebsmith/django-template-debug
  [3]: https://django-template-debug.readthedocs.org/en/latest/_templates/quick_start.html#example-usage
  [4]: https://django-template-debug.readthedocs.org/en/latest/_templates/set_trace.html#set-trace
  [5]: http://docs.python.org/2/library/pdb.html
  [6]: http://django-debug-toolbar.readthedocs.org/en/1.0/
  [7]: http://django-debug-toolbar.readthedocs.org/en/1.0/panels.html#template
  [8]: http://docs.djangoproject.com/en/dev/ref/settings/#debug

Pro tip. Use `textarea` and auto select `onclick` for easier copy-paste:

    &lt;textarea onclick=&quot;this.focus();this.select()&quot; style=&quot;width: 100%;&quot;&gt; {% filter force_escape %} {% debug %} {% endfilter %}&lt;/textarea&gt;

The [debug toolbar][1] does all this and much, much more. See the [screencast][2] for more. If you literally just want the variables, you could try

    assert False, locals()

in your view


  [1]: http://github.com/robhudson/django-debug-toolbar
  [2]: http://vimeo.com/6640136

A slightly more complex solution with better rewards is to load [django-debug-toolbar][1] (documentation [here][2])

There&#39;s an option called &#39;Templates&#39; with another option to &#39;Toggle context&#39; and you can see all the variables passed to your template, as well as the ability to see the code behind the template.

![Example of django-debug-toolbar template debugging][3]


  [1]: https://github.com/django-debug-toolbar/django-debug-toolbar
  [2]: http://django-debug-toolbar.readthedocs.org/
  [3]: http://i.stack.imgur.com/sfSRu.png

If you use pycharm of professional version, you can set breakpoints on some lines in a template file and view the variable value.

For more detail, follow this link.[https://www.jetbrains.com/help/pycharm/debugging-django-templates.html][1]


  [1]: https://www.jetbrains.com/help/pycharm/debugging-django-templates.html

I set up a remote repository and I can push new changes to it, but I cannot fetch from it, I always get the (rather cryptic) error message:

    fatal: Refusing to fetch into current branch refs/heads/master of non-bare repository
    fatal: The remote end hung up unexpectedly

What does it mean? What should I do to enable fetching?

(Note that this remote repo is only used as a backup repo, so it should be pretty much an exact copy of my local repository. I really can&#39;t understand why I can push to it but not fetch from it...)

My config looks like:

    [remote &quot;origin&quot;]
        url = ssh://blablablah
        fetch = +refs/*:refs/*
        mirror = true

git refusing to fetch into current branch

So I&#39;m running this javascript, and everything works fine, except the paths to the background image. It works on my local ASP.NET Dev environment, but it does NOT work when deployed to a server in a virtual directory.

This is in an external .js file, folder structure is

    Site/Content/style.css
    Site/Scripts/myjsfile.js
    Site/Images/filters_expand.jpg
    Site/Images/filters_colapse.jpg
    
then this is where the js file is included from

    Site/Views/ProductList/Index.aspx

    $(&quot;#toggle&quot;).click(function() {
        if (left.width() &gt; 0) {
            AnimateNav(left, right, 0);
            $(this).css(&quot;background&quot;, &quot;url(&#39;../Images/filters_expand.jpg&#39;)&quot;);
        }
        else {
            AnimateNav(left, right, 170);
            $(this).css(&quot;background&quot;, &quot;url(&#39;../Images/filters_collapse.jpg&#39;)&quot;);
        }
    });

I&#39;ve tried using `&#39;/Images/filters_collapse.jpg&#39;` and that doesn&#39;t work either; however, it seems to work on the server if I use `&#39;../../Images/filters_collapse.jpg&#39;`.

Basically, I want have the same functionallity as the ASP.NET tilda -- `~`.

**update**

Are paths in external .js files relative to the Page they are included in, or the actual location of the .js file?

Relative Paths in Javascript in an external file

Is there a template tag (or any other trick) I can use to display all the variables available in a page?

Django debug display all variables of a page

<p>Is there a template tag (or any other trick) I can use to display all the variables available in a page?</p>


Consider the following models and form:

    class Pizza(models.Model):
        name = models.CharField(max_length=50)
    
    class Topping(models.Model):
        name = models.CharField(max_length=50)
        ison = models.ManyToManyField(Pizza, blank=True)
    
    class ToppingForm(forms.ModelForm):
        class Meta:
            model = Topping


When you view the ToppingForm it lets you choose what pizzas the toppings go on and everything is just dandy.

My questions is: How do I define a ModelForm for Pizza that lets me take advantage of the Many-to-Many relationship between Pizza and Topping and lets me choose what Toppings go on the Pizza?




Django ModelForm for Many-to-Many fields

I have a model:

    class Zone(models.Model):
        name = models.CharField(max_length=128)
        users = models.ManyToManyField(User, related_name=&#39;zones&#39;, null=True, blank=True)

And I need to contruct a filter along the lines of:

    u = User.objects.filter(...zones contains a particular zone...)

It has to be a filter on User and it has to be a single filter parameter. The reason for this is that I am constructing a URL querystring to filter the admin user changelist: `http://myserver/admin/auth/user/?zones=3`

It seems like it should be simple but my brain isn&#39;t cooperating!

Django ManyToMany filter()

How can I create more than one ModelAdmin for the same model, each customised differently and linked to different URLs?

Let&#39;s say I have a Django model called Posts. By default, the admin view of this model will list all Post objects.

I know I can customise the list of objects displayed on the page in various ways by setting variables like list_display or overriding the `queryset` method in my ModelAdmin like so:


    class MyPostAdmin(admin.ModelAdmin):
        list_display = (&#39;title&#39;, &#39;pub_date&#39;)

        def queryset(self, request):
            request_user = request.user
            return Post.objects.filter(author=request_user)

    admin.site.register(MyPostAdmin, Post)

By default, this would be accessible at the URL `/admin/myapp/post`. However I would like to have multiple views/ModelAdmins of the same model. e.g `/admin/myapp/post` would list all post objects, and `/admin/myapp/myposts` would list all posts belonging to the user, and `/admin/myapp/draftpost` might list all posts that have not yet been published. (these are just examples, my actual use-case is more complex)

You cannot register more than one ModelAdmin for the same model (this results in an `AlreadyRegistered` exception). Ideally I&#39;d like to achieve this **without** putting everything into a single ModelAdmin class and writing my own &#39;urls&#39; function to return a different queryset depending on the URL.

I&#39;ve had a look at the Django source and I see functions like `ModelAdmin.changelist_view` that could be somehow included in my urls.py, but I&#39;m not sure exactly how that would work.

**Update**: I&#39;ve found one way of doing what I want (see below), but I&#39;d still like to hear other ways of doing this.

Multiple ModelAdmins/views for same model in Django admin

I have a Django application in which I want to change a field from a ForeignKey to a ManyToManyField.  I want to preserve my old data.  What is the simplest/best process to follow for this?  If it matters, I use sqlite3 as my database back-end. 

If my summary of the problem isn&#39;t clear, here is an example.  Say I have two models:

    class Author(models.Model):  
        author = models.CharField(max_length=100) 
    
    class Book(models.Model):  
        author = models.ForeignKey(Author)  
        title = models.CharField(max_length=100)

  
  
Say I have a lot of data in my database.  Now, I want to change the Book model as follows:

    class Book(models.Model):  
        author = models.ManyToManyField(Author)  
        title = models.CharField(max_length=100) 

 
I don&#39;t want to &quot;lose&quot; all my prior data.  

What is the best/simplest way to accomplish this?   

Ken
 

Django data migration when changing a field to ManyToMany

I have done a ModelForm adding some extra fields that **are not** in the model. I use these fields for some calcualtions when saving the form.

The extra fields appear on the form and they are sent in the POST request when uploading the form. The problem is they are not added to the `cleaned_data` dictionary when I validate the form. How can I access them?

Django ModelForm with extra fields that are not in the model

Why does the following work?

    &lt;something&gt;.stop().animate(
        { &#39;top&#39; : 10 }, 10
    );

Whereas this doesn&#39;t work:

    var thetop = &#39;top&#39;;
    &lt;something&gt;.stop().animate(
        { thetop : 10 }, 10
    );

To make it even clearer: At the moment I&#39;m not able to pass a CSS property to the animate function as a variable.


How to use a variable for a key in a JavaScript object literal?

I&#39;ve been hearing these two words used in Microsoft tutorials for VB.NET. What is the difference between these two words when used in reference to variables?

What is the difference between &quot;instantiated&quot; and &quot;initialized&quot;?

I am coming from c# where this was easy, and possible.

I have this code:

    public abstract class clsAbstractTable {
    	
    	public abstract String TAG;
        public abstract void init();
    
    }

but Eclipse tells me I use illegal modifier. 

I have this class:

    public class clsContactGroups extends clsAbstractTable {
    
    	
    }

I want the variable and method defined in such way, that Eclipse to **prompt me**, I have unimplemented abstract **variables** and methods.

How do I need to define my abstract class so I should be prompted to implement the abstracts?

**EDIT 1**

I will create different classes for different db tables. Each class should have it&#39;s own TABLENAME variable, no exception. I have to make sure this variable is static each time when I create a new class that extends the abstract class.

Then in the abstract class I will have a method eg: init();

If in this init() method I call TABLENAME, it should take the value from the sub-class.

something like this should also work out

    String tablename=(clsAbstract)objItem.TABLENAME;
    // where objItem can be any class that extended clsAbstract;

**EDIT 2**

I want a constant(static) defined in each class having it&#39;s name defined in abstract. 

 - I define variable TABLENAME in abstract, but no value given.
 - I create a clsContactGroups, I should be prompted to implement TABLENAME, this is where gets some data. eg: TABLENAME=&quot;contactgroups&quot;;
 - I create a second class clsContacts, I should be prompted to implement TABLENAME, this is where gets some data. eg: TABLENAME=&quot;contacts&quot;;  
etc...

Abstract variables in Java?

In PHP, you can declare constants in two ways:

1. With `define` keyword

    ```PHP
    define(&#39;FOO&#39;, 1);
    ```

2. Using `const` keyword

    ```PHP
    const FOO = 1;
    ```

----------

- What are the main differences between those two?
- When and why should you use one and when use the other?



PHP | define() vs. const

When I try to compile this:

    public static Rand searchCount (int[] x)
    {
        int a ;
        int b ;

        ...

        for (int l= 0; l&lt;x.length; l++)
        {
            if (x[l] == 0)
            a++ ;
            else if (x[l] == 1)
            b++ ;
        }

        ...

    }

I get these errors:

```lang-none
Rand.java:72: variable a might not have been initialized
                a++ ;
                ^
Rand.java:74: variable b might not have been initialized
                b++ ;
                ^
2 errors
```

It seems to me that I initialized them at the top of the method. What&#39;s going wrong?



Variable might not have been initialized error

After few weeks break, I&#39;m trying to expand and extend my knowlege of templates with the book _Templates &amp;ndash; The Complete Guide_ by David Vandevoorde and Nicolai M. Josuttis, and what I&#39;m trying to understand at this moment is explicit instantiation of templates.

I don&#39;t actually have a problem with the mechanism as such, but I can&#39;t imagine a situation in which I would like or want to use this feature. If anyone can explain that to me I will be more than grateful.


Explicit template instantiation - when is it used?

I have heard that C++ class member function templates can&#39;t be virtual.  Is this true? 

If they can be virtual, what is an example of a scenario in which one would use such a function?

Can a class member function template be virtual?

I have some variables inside a template and I don&#39;t know where I assigned them. I need to know what is inside a particular variable; for instance, say I have a variable in smarty called `member`. I tried with `{debug}` but it didn&#39;t work, and no popup was shown. 

How can I output/debug smarty variables using something like `var_dump()` inside the templates?

How to Debug Variables in Smarty like in PHP var_dump()

This may be a silly question, but as someone relatively new to PHP, I&#39;m wondering if there are any performance-related issues to frequently opening and closing PHP tags in HTML template code, and if so, what might be best practices in terms of working with PHP tags?

My question is not about the importance/correctness of closing tags, or about which type of code is more readable than another, but rather about how the document gets parsed/executed and what impact it might have on performance.

To illustrate, consider the following two extremes:

**Mixing PHP and HTML tags:**

    &lt;?php echo
       &#39;&lt;tr&gt;
           &lt;td&gt;&#39;.$variable1.&#39;&lt;/td&gt;
           &lt;td&gt;&#39;.$variable2.&#39;&lt;/td&gt;
           &lt;td&gt;&#39;.$variable3.&#39;&lt;/td&gt;
           &lt;td&gt;&#39;.$variable4.&#39;&lt;/td&gt;
           &lt;td&gt;&#39;.$variable5.&#39;&lt;/td&gt;
       &lt;/tr&gt;&#39;
    ?&gt;
    // PHP tag opened once


**Separating PHP and HTML tags:**

    &lt;tr&gt;
       &lt;td&gt;&lt;?php echo $variable1 ?&gt;&lt;/td&gt;
       &lt;td&gt;&lt;?php echo $variable2 ?&gt;&lt;/td&gt;
       &lt;td&gt;&lt;?php echo $variable3 ?&gt;&lt;/td&gt;
       &lt;td&gt;&lt;?php echo $variable4 ?&gt;&lt;/td&gt;
       &lt;td&gt;&lt;?php echo $variable5 ?&gt;&lt;/td&gt;
    &lt;/tr&gt;
    // PHP tag opened five times

Would be interested in hearing some views on this, even if it&#39;s just to hear that it makes no difference.

Thanks.

Opening/closing tags &amp; performance?

Why are default template arguments only allowed on class templates?  Why can&#39;t we define a default type in a member function template?  For example:

    struct mycclass {
      template&lt;class T=int&gt;
      void mymember(T* vec) {
        // ...
      }
    };

Instead, C++ forces that default template arguments are only allowed on a class template.

Default template arguments for function templates

I am looking for an equivalent in Chrome to the &quot;break on all errors&quot; functionality of Firebug. In the Scripts tab, Chrome has a &quot;pause on all exceptions&quot;, but this is not quite the same as breaking on all errors.

For instance, when loading a page with the following code, I would like Chrome to break on the line `foo.bar = 42`. Instead, even when enabling the &quot;Pause on all exceptions&quot;, I don&#39;t get the expected result.

    &lt;!DOCTYPE html PUBLIC &quot;-//W3C//DTD XHTML 1.0 Strict//EN&quot;
            &quot;http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd&quot;&gt;
    &lt;html xmlns=&quot;http://www.w3.org/1999/xhtml&quot; xml:lang=&quot;en&quot; lang=&quot;en&quot;&gt;
        &lt;head&gt;
            &lt;script type=&quot;text/javascript&quot;&gt;
            
                function doError() {
                    foo.bar = 42;
                }
            
                window.onload = function() {
                    try {
                        doError();
                    } catch (e) {
                        console.log(&quot;Error&quot;, e);
                    }
                }
            &lt;/script&gt;
        &lt;/head&gt;
        &lt;body&gt;
        &lt;/body&gt;
    &lt;/html&gt;

You can try the code pasted above on [this page][1] or using this [jsFiddle][2].


  [1]: http://dl.dropbox.com/u/6900/try/ee-chrome-errors.html
  [2]: http://jsfiddle.net/avernet/KvjNB/

JavaScript: Is there a way to get Chrome to break on all errors?

Which preprocessor define should be used to specify debug sections of code?

Use `#ifdef _DEBUG` or `#ifndef NDEBUG` or is there a better way to do it, e.g. `#define MY_DEBUG`?

I think `_DEBUG` is Visual Studio specific, is NDEBUG standard?

_DEBUG vs NDEBUG

Ok, what I have: 

Visual Studio 2010 RC, W7 x64, started a new project type of Silverlight application. Hosting the Silverlight application in a ASP.NET Web Application Project. Silverlight Version 3.0.
Added a LinqToSQL Class, a WCF Service, a Winform Tester Application (Project in the Solution) and a few Classes (also as Projects in the Solution).

Yesterday, suddenly I got the &#39;The breakpoint will not currently be hit. No symbols have been loaded for this document.&#39; message to appear in the IDE, but it only affects the Web Appliaction, I can debug the Silverlight and the Winform App.
 
What I tried / did to get rid of the message:
 
- Reset Visual Studio Settings
- removed all files in every \Temporary ASP.NET Files Folder (there is one for each 32bit/64bit and for Framework 2.0 and 4.0)
- tried to debug using Visual Studio Integrated Web server - normally I use IIS, in the project output of the solution I deleted every obj and bin folders in every project folder
- created a new solution and added all the projects to this new solution
- deleted the solution suo file
- created a new ASP.NET Web Application to test if it is a VS-installation issue =&gt; I can debug this new project/solution
- rebooted the machine several times
- repaired the vs.net installation
- did an IISReset
- removed the Web App from IIS
- used the Create Virtual Directory Button under Project Properties of the Web App to create a new Web App in IIS
- changed the Framework Version of every project from 3.5 to 4.0
- Opened the Solution on my second machine =&gt; same behavior
- crawled Microsoft Connect for bugs / similar issues
- SPENT 7 HOURS. 

So, this happens the 2nd time in my life. last time I solved it by deleting Temporary ASP.NET Files Folder, but this time I need your help.

The breakpoint will not currently be hit. No symbols have been loaded for this document in a Silverlight application

Under linux, can I use GDB to debug a process that is currently running?

Can I use GDB to debug a running process?

I&#39;m working on a project that involves Raphaeljs. Turns out, it doesn&#39;t work on Android. It *does* on the iPhone.

How the heck to I go about debugging something on the Android browser? It&#39;s WebKit, so if I know the version, will debugging it on that *full* version of WebKit produce the same results?

Content Type	Original Author	Original Content on Stackoverflow
Question	eaman	View Question on Stackoverflow
Solution 1 - Django	Keryn Knight	View Answer on Stackoverflow
Solution 2 - Django	Robert Lujo	View Answer on Stackoverflow
Solution 3 - Django	Capuchin	View Answer on Stackoverflow
Solution 4 - Django	Tom	View Answer on Stackoverflow
Solution 5 - Django	Aaron C. de Bruyn	View Answer on Stackoverflow
Solution 6 - Django	W.Perrin	View Answer on Stackoverflow

Django debug display all variables of a page

Django Problem Overview

Django Solutions

Solution 1 - Django

Solution 2 - Django

Solution 3 - Django

Solution 4 - Django

Solution 5 - Django

Solution 6 - Django

Relative Paths in Javascript in an external file

git refusing to fetch into current branch

Attributions