unicode: Merged from trunk up to [5443].

git-svn-id: http://code.djangoproject.com/svn/django/branches/unicode@5444 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/template/defaulttags.py

@@ -6,6 +6,7 @@
 from django.conf import settings
 from django.utils.encoding import smart_str
 import sys
+import re
 
 register = Library()
 
@@ -62,8 +63,8 @@ def render(self, context):
         return ''
 
 class ForNode(Node):
-    def __init__(self, loopvar, sequence, reversed, nodelist_loop):
-        self.loopvar, self.sequence = loopvar, sequence
+    def __init__(self, loopvars, sequence, reversed, nodelist_loop):
+        self.loopvars, self.sequence = loopvars, sequence
         self.reversed = reversed
         self.nodelist_loop = nodelist_loop
 
@@ -73,7 +74,7 @@ def __repr__(self):
         else:
             reversed = ''
         return "<For Node: for %s in %s, tail_len: %d%s>" % \
-            (self.loopvar, self.sequence, len(self.nodelist_loop), reversed)
+            (', '.join( self.loopvars ), self.sequence, len(self.nodelist_loop), reversed)
 
     def __iter__(self):
         for node in self.nodelist_loop:
@@ -108,6 +109,7 @@ def reverse(data):
                 for index in range(len(data)-1, -1, -1):
                     yield data[index]
             values = reverse(values)
+        unpack = len(self.loopvars) > 1
         for i, item in enumerate(values):
             context['forloop'] = {
                 # shortcuts for current loop iteration number
@@ -121,9 +123,20 @@ def reverse(data):
                 'last': (i == len_values - 1),
                 'parentloop': parentloop,
             }
-            context[self.loopvar] = item
+            if unpack:
+                # If there are multiple loop variables, unpack the item into them.
+                context.update(dict(zip(self.loopvars, item)))
+            else:
+                context[self.loopvars[0]] = item
             for node in self.nodelist_loop:
                 nodelist.append(node.render(context))
+            if unpack:
+                # The loop variables were pushed on to the context so pop them
+                # off again. This is necessary because the tag lets the length
+                # of loopvars differ to the length of each set of items and we
+                # don't want to leave any vars from the previous loop on the
+                # context.
+                context.pop()
         context.pop()
         return nodelist.render(context)
 
@@ -487,7 +500,7 @@ def do_filter(parser, token):
     nodelist = parser.parse(('endfilter',))
     parser.delete_first_token()
     return FilterNode(filter_expr, nodelist)
-filter = register.tag("filter", do_filter)
+do_filter = register.tag("filter", do_filter)
 
 #@register.tag
 def firstof(parser, token):
@@ -531,8 +544,14 @@ def do_for(parser, token):
         {% endfor %}
         </ul>
 
-    You can also loop over a list in reverse by using
+    You can loop over a list in reverse by using
     ``{% for obj in list reversed %}``.
+    
+    You can also unpack multiple values from a two-dimensional array::
+    
+        {% for key,value in dict.items %}
+            {{ key }}: {{ value }}
+        {% endfor %}
 
     The for loop sets a number of variables available within the loop:
 
@@ -553,18 +572,23 @@ def do_for(parser, token):
 
     """
     bits = token.contents.split()
-    if len(bits) == 5 and bits[4] != 'reversed':
-        raise TemplateSyntaxError, "'for' statements with five words should end in 'reversed': %s" % token.contents
-    if len(bits) not in (4, 5):
-        raise TemplateSyntaxError, "'for' statements should have either four or five words: %s" % token.contents
-    if bits[2] != 'in':
-        raise TemplateSyntaxError, "'for' statement must contain 'in' as the second word: %s" % token.contents
-    loopvar = bits[1]
-    sequence = parser.compile_filter(bits[3])
-    reversed = (len(bits) == 5)
+    if len(bits) < 4:
+        raise TemplateSyntaxError, "'for' statements should have at least four words: %s" % token.contents
+
+    reversed = bits[-1] == 'reversed'
+    in_index = reversed and -3 or -2
+    if bits[in_index] != 'in':
+        raise TemplateSyntaxError, "'for' statements should use the format 'for x in y': %s" % token.contents
+
+    loopvars = re.sub(r' *, *', ',', ' '.join(bits[1:in_index])).split(',')
+    for var in loopvars:
+        if not var or ' ' in var:
+            raise TemplateSyntaxError, "'for' tag received an invalid argument: %s" % token.contents
+
+    sequence = parser.compile_filter(bits[in_index+1])
     nodelist_loop = parser.parse(('endfor',))
     parser.delete_first_token()
-    return ForNode(loopvar, sequence, reversed, nodelist_loop)
+    return ForNode(loopvars, sequence, reversed, nodelist_loop)
 do_for = register.tag("for", do_for)
 
 def do_ifequal(parser, token, negate):

docs/add_ons.txt

@@ -6,8 +6,9 @@ Django aims to follow Python's `"batteries included" philosophy`_. It ships
 with a variety of extra, optional tools that solve common Web-development
 problems.
 
-This code lives in ``django/contrib`` in the Django distribution. Here's a
-rundown of the packages in ``contrib``:
+This code lives in ``django/contrib`` in the Django distribution. This document
+gives a rundown of the packages in ``contrib``, along with any dependencies
+those packages have.
 
 .. admonition:: Note
 
@@ -26,6 +27,8 @@ The automatic Django administrative interface. For more information, see
 
 .. _Tutorial 2: ../tutorial02/
 
+Requires the auth_ and contenttypes_ contrib packages to be installed.
+
 auth
 ====
 
@@ -144,6 +147,8 @@ See the `flatpages documentation`_.
 
 .. _flatpages documentation: ../flatpages/
 
+Requires the sites_ contrib package to be installed as well.
+
 localflavor
 ===========
 

docs/db-api.txt

@@ -134,6 +134,15 @@ the database until you explicitly call ``save()``.
 
 The ``save()`` method has no return value.
 
+Updating ``ForeignKey`` fields works exactly the same way; simply assign an
+object of the right type to the field in question::
+
+    joe = Author.objects.create(name="Joe")
+    entry.author = joe
+    entry.save()
+
+Django will complain if you try to assign an object of the wrong type.
+
 How Django knows to UPDATE vs. INSERT
 -------------------------------------
 
@@ -1229,8 +1238,8 @@ whose ``headline`` contains ``'Lennon'``::
 
     Blog.objects.filter(entry__headline__contains='Lennon')
 
-Escaping parenthesis and underscores in LIKE statements
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Escaping percent signs and underscores in LIKE statements
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 The field lookups that equate to ``LIKE`` SQL statements (``iexact``,
 ``contains``, ``icontains``, ``startswith``, ``istartswith``, ``endswith``

docs/fastcgi.txt

@@ -203,7 +203,7 @@ This is probably the most common case, if you're using Django's admin site::
       DocumentRoot /home/user/public_html
       Alias /media /home/user/python/django/contrib/admin/media
       RewriteEngine On
-      RewriteRule ^/(media.*)$ /$1 [QSA,L]
+      RewriteRule ^/(media.*)$ /$1 [QSA,L,PT]
       RewriteCond %{REQUEST_FILENAME} !-f
       RewriteRule ^/(.*)$ /mysite.fcgi/$1 [QSA,L]
     </VirtualHost>

docs/model-api.txt

@@ -1890,21 +1890,23 @@ rows. Example::
         row = cursor.fetchone()
         return row
 
-``connection`` and ``cursor`` simply use the standard `Python DB-API`_. If
-you're not familiar with the Python DB-API, note that the SQL statement in
-``cursor.execute()`` uses placeholders, ``"%s"``, rather than adding parameters
-directly within the SQL. If you use this technique, the underlying database
-library will automatically add quotes and escaping to your parameter(s) as
-necessary. (Also note that Django expects the ``"%s"`` placeholder, *not* the
-``"?"`` placeholder, which is used by the SQLite Python bindings. This is for
-the sake of consistency and sanity.)
+``connection`` and ``cursor`` mostly implement the standard `Python DB-API`_
+(except when it comes to `transaction handling`_). If you're not familiar with
+the Python DB-API, note that the SQL statement in ``cursor.execute()`` uses
+placeholders, ``"%s"``, rather than adding parameters directly within the SQL.
+If you use this technique, the underlying database library will automatically
+add quotes and escaping to your parameter(s) as necessary. (Also note that
+Django expects the ``"%s"`` placeholder, *not* the ``"?"`` placeholder, which is
+used by the SQLite Python bindings. This is for the sake of consistency and
+sanity.)
 
 A final note: If all you want to do is a custom ``WHERE`` clause, you can just
 just the ``where``, ``tables`` and ``params`` arguments to the standard lookup
 API. See `Other lookup options`_.
 
 .. _Python DB-API: http://www.python.org/peps/pep-0249.html
 .. _Other lookup options: ../db-api/#extra-params-select-where-tables
+.. _transaction handling: ../transactions/
 
 Overriding default model methods
 --------------------------------

docs/modpython.txt

@@ -51,9 +51,17 @@ whereas ``<Location>`` points at places in the URL structure of a Web site.
 ``<Directory>`` would be meaningless here.
 
 Also, if you've manually altered your ``PYTHONPATH`` to put your Django project
-on it, you'll need to tell mod_python::
+on it, you'll need to tell mod_python:
 
-    PythonPath "['/path/to/project'] + sys.path"
+.. parsed-literal::
+
+    <Location "/mysite/">
+        SetHandler python-program
+        PythonHandler django.core.handlers.modpython
+        SetEnv DJANGO_SETTINGS_MODULE mysite.settings
+        PythonDebug On
+        **PythonPath "['/path/to/project'] + sys.path"**
+    </Location>
 
 .. caution::
 

docs/newforms.txt

@@ -299,12 +299,14 @@ required. In this example, the data dictionary doesn't include a value for the
 In this above example, the ``cleaned_data`` value for ``nick_name`` is set to an
 empty string, because ``nick_name`` is ``CharField``, and ``CharField``\s treat
 empty values as an empty string. Each field type knows what its "blank" value
-is -- e.g., for ``DateField``, it's ``None`` instead of the empty string.
+is -- e.g., for ``DateField``, it's ``None`` instead of the empty string. For
+full details on each field's behavior in this case, see the "Empty value" note
+for each field in the "Built-in ``Field`` classes" section below.
 
 Behavior of unbound forms
 ~~~~~~~~~~~~~~~~~~~~~~~~~
 
-It's meaningless to request "clean" data in a form with no data, but, for the
+It's meaningless to request "cleaned" data in a form with no data, but, for the
 record, here's what happens with unbound forms::
 
     >>> f = ContactForm()
@@ -606,8 +608,13 @@ Using forms in views and templates
 ----------------------------------
 
 Let's put this all together and use the ``ContactForm`` example in a Django
-view and template. This example view displays the contact form by default and
-validates/processes it if accessed via a POST request::
+view and template.
+
+Simple view example
+~~~~~~~~~~~~~~~~~~~
+
+This example view displays the contact form by default and validates/processes
+it if accessed via a POST request::
 
     def contact(request):
         if request.method == 'POST':
@@ -619,12 +626,12 @@ validates/processes it if accessed via a POST request::
             form = ContactForm()
         return render_to_response('contact.html', {'form': form})
 
-Simple template output
-~~~~~~~~~~~~~~~~~~~~~~
+Simple template example
+~~~~~~~~~~~~~~~~~~~~~~~
 
-The template, ``contact.html``, is responsible for displaying the form as HTML.
-To do this, we can use the techniques outlined in the "Outputting forms as HTML"
-section above.
+The template in the above view example, ``contact.html``, is responsible for
+displaying the form as HTML. To do this, we can use the techniques outlined in
+the "Outputting forms as HTML" section above.
 
 The simplest way to display a form's HTML is to use the variable on its own,
 like this::
@@ -677,7 +684,7 @@ The easiest way is to iterate over the form's fields, with
 
 This iteration technique is useful if you want to apply the same HTML
 formatting to each field, or if you don't know the names of the form fields
-ahead of time. Note that the fields will be listed in the order in which
+ahead of time. Note that the fields will be iterated over in the order in which
 they're defined in the ``Form`` class.
 
 Alternatively, you can arrange the form's fields explicitly, by name. Do that
@@ -701,7 +708,10 @@ For example::
 Subclassing forms
 -----------------
 
-If you subclass a custom ``Form`` class, the resulting ``Form`` class will
+If you have multiple ``Form`` classes that share fields, you can use
+subclassing to remove redundancy.
+
+When you subclass a custom ``Form`` class, the resulting subclass will
 include all fields of the parent class(es), followed by the fields you define
 in the subclass.
 
@@ -1202,6 +1212,36 @@ custom ``Field`` classes. To do this, just create a subclass of
 mentioned above (``required``, ``label``, ``initial``, ``widget``,
 ``help_text``).
 
+A simple example
+~~~~~~~~~~~~~~~~
+
+Here's a simple example of a custom field that validates its input is a string
+containing comma-separated e-mail addresses, with at least one address. We'll
+keep it simple and assume e-mail validation is contained in a function called
+``is_valid_email()``. The full class::
+
+    from django import newforms as forms
+
+    class MultiEmailField(forms.Field):
+        def clean(self, value):
+            emails = value.split(',')
+            for email in emails:
+                if not is_valid_email(email):
+                    raise forms.ValidationError('%s is not a valid e-mail address.' % email)
+            if not emails:
+                raise forms.ValidationError('Enter at least one e-mail address.')
+            return emails
+
+Let's alter the ongoing ``ContactForm`` example to demonstrate how you'd use
+this in a form. Simply use ``MultiEmailField`` instead of ``forms.EmailField``,
+like so::
+
+    class ContactForm(forms.Form):
+        subject = forms.CharField(max_length=100)
+        message = forms.CharField()
+        senders = MultiEmailField()
+        cc_myself = forms.BooleanField()
+
 Generating forms for models
 ===========================
 

docs/templates.txt

@@ -91,9 +91,12 @@ Filters can be "chained." The output of one filter is applied to the next.
 ``{{ text|escape|linebreaks }}`` is a common idiom for escaping text contents,
 then converting line breaks to ``<p>`` tags.
 
-Some filters take arguments. A filter argument looks like this:
-``{{ bio|truncatewords:"30" }}``. This will display the first 30 words of the
-``bio`` variable. Filter arguments always are in double quotes.
+Some filters take arguments. A filter argument looks like this: ``{{
+bio|truncatewords:30 }}``. This will display the first 30 words of the ``bio``
+variable.
+
+Filter arguments that contain spaces must be quoted; for example, to join a list
+with commas and spaced you'd use ``{{ list|join:", " }}``.
 
 The `Built-in filter reference`_ below describes all the built-in filters.
 
@@ -444,15 +447,33 @@ for
 ~~~
 
 Loop over each item in an array.  For example, to display a list of athletes
-given ``athlete_list``::
+provided in ``athlete_list``::
 
     <ul>
     {% for athlete in athlete_list %}
         <li>{{ athlete.name }}</li>
     {% endfor %}
     </ul>
 
-You can also loop over a list in reverse by using ``{% for obj in list reversed %}``.
+You can loop over a list in reverse by using ``{% for obj in list reversed %}``.
+
+**New in Django development version**
+If you need to loop over a list of lists, you can unpack the values
+in eachs sub-list into a set of known names. For example, if your context contains
+a list of (x,y) coordinates called ``points``, you could use the following
+to output the list of points:: 
+
+    {% for x, y in points %}
+        There is a point at {{ x }},{{ y }}
+    {% endfor %}
+
+This can also be useful if you need to access the items in a dictionary. 
+For example, if your context contained a dictionary ``data``, the following
+would display the keys and values of the dictionary::
+
+    {% for key, value in data.items %}
+        {{ key }}: {{ value }}
+    {% endfor %}
 
 The for loop sets a number of variables available within the loop: