app/django/forms/forms.py
author Sverre Rabbelier <srabbelier@gmail.com>
Sat, 22 Nov 2008 13:59:34 +0000
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parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Make redirect generic using the new Lists object This makes it possible (and easier) to have the list view redirect to any page specially tailored to the current item. Patch by: Sverre Rabbelier
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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"""
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Form classes
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"""
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from copy import deepcopy
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from django.utils.datastructures import SortedDict
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from django.utils.html import escape
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from django.utils.encoding import StrAndUnicode, smart_unicode, force_unicode
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from django.utils.safestring import mark_safe
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from fields import Field, FileField
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from widgets import Media, media_property, TextInput, Textarea
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from util import flatatt, ErrorDict, ErrorList, ValidationError
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__all__ = ('BaseForm', 'Form')
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NON_FIELD_ERRORS = '__all__'
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def pretty_name(name):
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    "Converts 'first_name' to 'First name'"
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    name = name[0].upper() + name[1:]
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    return name.replace('_', ' ')
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def get_declared_fields(bases, attrs, with_base_fields=True):
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    """
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    Create a list of form field instances from the passed in 'attrs', plus any
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    similar fields on the base classes (in 'bases'). This is used by both the
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    Form and ModelForm metclasses.
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    If 'with_base_fields' is True, all fields from the bases are used.
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    Otherwise, only fields in the 'declared_fields' attribute on the bases are
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    used. The distinction is useful in ModelForm subclassing.
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    Also integrates any additional media definitions
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    """
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    fields = [(field_name, attrs.pop(field_name)) for field_name, obj in attrs.items() if isinstance(obj, Field)]
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    fields.sort(lambda x, y: cmp(x[1].creation_counter, y[1].creation_counter))
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    # If this class is subclassing another Form, add that Form's fields.
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    # Note that we loop over the bases in *reverse*. This is necessary in
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    # order to preserve the correct order of fields.
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    if with_base_fields:
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        for base in bases[::-1]:
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            if hasattr(base, 'base_fields'):
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                fields = base.base_fields.items() + fields
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    else:
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        for base in bases[::-1]:
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            if hasattr(base, 'declared_fields'):
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                fields = base.declared_fields.items() + fields
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    return SortedDict(fields)
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class DeclarativeFieldsMetaclass(type):
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    """
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    Metaclass that converts Field attributes to a dictionary called
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    'base_fields', taking into account parent class 'base_fields' as well.
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    """
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    def __new__(cls, name, bases, attrs):
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        attrs['base_fields'] = get_declared_fields(bases, attrs)
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        new_class = super(DeclarativeFieldsMetaclass,
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                     cls).__new__(cls, name, bases, attrs)
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        if 'media' not in attrs:
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            new_class.media = media_property(new_class)
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        return new_class
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class BaseForm(StrAndUnicode):
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    # This is the main implementation of all the Form logic. Note that this
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    # class is different than Form. See the comments by the Form class for more
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    # information. Any improvements to the form API should be made to *this*
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    # class, not to the Form class.
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    def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None,
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                 initial=None, error_class=ErrorList, label_suffix=':',
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                 empty_permitted=False):
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        self.is_bound = data is not None or files is not None
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        self.data = data or {}
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        self.files = files or {}
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        self.auto_id = auto_id
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        self.prefix = prefix
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        self.initial = initial or {}
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        self.error_class = error_class
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        self.label_suffix = label_suffix
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        self.empty_permitted = empty_permitted
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        self._errors = None # Stores the errors after clean() has been called.
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        self._changed_data = None
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        # The base_fields class attribute is the *class-wide* definition of
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        # fields. Because a particular *instance* of the class might want to
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        # alter self.fields, we create self.fields here by copying base_fields.
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        # Instances should always modify self.fields; they should not modify
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        # self.base_fields.
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        self.fields = deepcopy(self.base_fields)
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    def __unicode__(self):
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        return self.as_table()
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    def __iter__(self):
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        for name, field in self.fields.items():
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            yield BoundField(self, field, name)
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    def __getitem__(self, name):
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        "Returns a BoundField with the given name."
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        try:
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            field = self.fields[name]
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        except KeyError:
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            raise KeyError('Key %r not found in Form' % name)
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        return BoundField(self, field, name)
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    def _get_errors(self):
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        "Returns an ErrorDict for the data provided for the form"
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        if self._errors is None:
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            self.full_clean()
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        return self._errors
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    errors = property(_get_errors)
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    def is_valid(self):
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        """
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        Returns True if the form has no errors. Otherwise, False. If errors are
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        being ignored, returns False.
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        """
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        return self.is_bound and not bool(self.errors)
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    def add_prefix(self, field_name):
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        """
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        Returns the field name with a prefix appended, if this Form has a
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        prefix set.
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        Subclasses may wish to override.
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        """
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        return self.prefix and ('%s-%s' % (self.prefix, field_name)) or field_name
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    def add_initial_prefix(self, field_name):
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        """
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        Add a 'initial' prefix for checking dynamic initial values
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        """
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        return u'initial-%s' % self.add_prefix(field_name)
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    def _html_output(self, normal_row, error_row, row_ender, help_text_html, errors_on_separate_row):
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        "Helper function for outputting HTML. Used by as_table(), as_ul(), as_p()."
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        top_errors = self.non_field_errors() # Errors that should be displayed above all fields.
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        output, hidden_fields = [], []
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        for name, field in self.fields.items():
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            bf = BoundField(self, field, name)
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            bf_errors = self.error_class([escape(error) for error in bf.errors]) # Escape and cache in local variable.
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            if bf.is_hidden:
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                if bf_errors:
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                    top_errors.extend([u'(Hidden field %s) %s' % (name, force_unicode(e)) for e in bf_errors])
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                hidden_fields.append(unicode(bf))
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            else:
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                if errors_on_separate_row and bf_errors:
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                    output.append(error_row % force_unicode(bf_errors))
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                if bf.label:
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                    label = escape(force_unicode(bf.label))
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                    # Only add the suffix if the label does not end in
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                    # punctuation.
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                    if self.label_suffix:
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                        if label[-1] not in ':?.!':
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                            label += self.label_suffix
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                    label = bf.label_tag(label) or ''
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                else:
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                    label = ''
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                if field.help_text:
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                    help_text = help_text_html % force_unicode(field.help_text)
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                else:
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                    help_text = u''
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                output.append(normal_row % {'errors': force_unicode(bf_errors), 'label': force_unicode(label), 'field': unicode(bf), 'help_text': help_text})
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        if top_errors:
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            output.insert(0, error_row % force_unicode(top_errors))
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        if hidden_fields: # Insert any hidden fields in the last row.
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            str_hidden = u''.join(hidden_fields)
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            if output:
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                last_row = output[-1]
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                # Chop off the trailing row_ender (e.g. '</td></tr>') and
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                # insert the hidden fields.
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                if not last_row.endswith(row_ender):
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                    # This can happen in the as_p() case (and possibly others
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                    # that users write): if there are only top errors, we may
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                    # not be able to conscript the last row for our purposes,
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                    # so insert a new, empty row.
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                    last_row = normal_row % {'errors': '', 'label': '', 'field': '', 'help_text': ''}
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                    output.append(last_row)
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                output[-1] = last_row[:-len(row_ender)] + str_hidden + row_ender
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            else:
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                # If there aren't any rows in the output, just append the
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                # hidden fields.
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                output.append(str_hidden)
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        return mark_safe(u'\n'.join(output))
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    def as_table(self):
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        "Returns this form rendered as HTML <tr>s -- excluding the <table></table>."
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        return self._html_output(u'<tr><th>%(label)s</th><td>%(errors)s%(field)s%(help_text)s</td></tr>', u'<tr><td colspan="2">%s</td></tr>', '</td></tr>', u'<br />%s', False)
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    def as_ul(self):
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        "Returns this form rendered as HTML <li>s -- excluding the <ul></ul>."
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        return self._html_output(u'<li>%(errors)s%(label)s %(field)s%(help_text)s</li>', u'<li>%s</li>', '</li>', u' %s', False)
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    def as_p(self):
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        "Returns this form rendered as HTML <p>s."
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        return self._html_output(u'<p>%(label)s %(field)s%(help_text)s</p>', u'%s', '</p>', u' %s', True)
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    def non_field_errors(self):
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   201
        """
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        Returns an ErrorList of errors that aren't associated with a particular
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        field -- i.e., from Form.clean(). Returns an empty ErrorList if there
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        are none.
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        """
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        return self.errors.get(NON_FIELD_ERRORS, self.error_class())
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    def full_clean(self):
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        """
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        Cleans all of self.data and populates self._errors and
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   211
        self.cleaned_data.
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   212
        """
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   213
        self._errors = ErrorDict()
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   214
        if not self.is_bound: # Stop further processing.
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   215
            return
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        self.cleaned_data = {}
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   217
        # If the form is permitted to be empty, and none of the form data has
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   218
        # changed from the initial data, short circuit any validation.
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   219
        if self.empty_permitted and not self.has_changed():
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   220
            return
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   221
        for name, field in self.fields.items():
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   222
            # value_from_datadict() gets the data from the data dictionaries.
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   223
            # Each widget type knows how to retrieve its own data, because some
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   224
            # widgets split data over several HTML fields.
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   225
            value = field.widget.value_from_datadict(self.data, self.files, self.add_prefix(name))
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            try:
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   227
                if isinstance(field, FileField):
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   228
                    initial = self.initial.get(name, field.initial)
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   229
                    value = field.clean(value, initial)
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   230
                else:
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   231
                    value = field.clean(value)
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   232
                self.cleaned_data[name] = value
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   233
                if hasattr(self, 'clean_%s' % name):
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   234
                    value = getattr(self, 'clean_%s' % name)()
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                    self.cleaned_data[name] = value
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            except ValidationError, e:
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                self._errors[name] = e.messages
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                if name in self.cleaned_data:
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                    del self.cleaned_data[name]
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        try:
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            self.cleaned_data = self.clean()
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        except ValidationError, e:
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            self._errors[NON_FIELD_ERRORS] = e.messages
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        if self._errors:
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            delattr(self, 'cleaned_data')
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    def clean(self):
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        """
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        Hook for doing any extra form-wide cleaning after Field.clean() been
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        called on every field. Any ValidationError raised by this method will
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        not be associated with a particular field; it will have a special-case
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        association with the field named '__all__'.
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        """
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        return self.cleaned_data
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    def has_changed(self):
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        """
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        Returns True if data differs from initial.
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        """
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        return bool(self.changed_data)
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    def _get_changed_data(self):
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        if self._changed_data is None:
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            self._changed_data = []
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            # XXX: For now we're asking the individual widgets whether or not the
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            # data has changed. It would probably be more efficient to hash the
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            # initial data, store it in a hidden field, and compare a hash of the
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            # submitted data, but we'd need a way to easily get the string value
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            # for a given field. Right now, that logic is embedded in the render
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            # method of each widget.
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            for name, field in self.fields.items():
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                prefixed_name = self.add_prefix(name)
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                data_value = field.widget.value_from_datadict(self.data, self.files, prefixed_name)
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                if not field.show_hidden_initial:
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                    initial_value = self.initial.get(name, field.initial)
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                else:
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                    initial_prefixed_name = self.add_initial_prefix(name)
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                    hidden_widget = field.hidden_widget()
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                    initial_value = hidden_widget.value_from_datadict(
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                        self.data, self.files, initial_prefixed_name)
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                if field.widget._has_changed(initial_value, data_value):
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                    self._changed_data.append(name)
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        return self._changed_data
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    changed_data = property(_get_changed_data)
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    def _get_media(self):
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        """
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        Provide a description of all media required to render the widgets on this form
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        """
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        media = Media()
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        for field in self.fields.values():
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            media = media + field.widget.media
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        return media
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    media = property(_get_media)
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    def is_multipart(self):
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        """
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        Returns True if the form needs to be multipart-encrypted, i.e. it has
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        FileInput. Otherwise, False.
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        """
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        for field in self.fields.values():
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            if field.widget.needs_multipart_form:
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                return True
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        return False
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class Form(BaseForm):
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    "A collection of Fields, plus their associated data."
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    # This is a separate class from BaseForm in order to abstract the way
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    # self.fields is specified. This class (Form) is the one that does the
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    # fancy metaclass stuff purely for the semantic sugar -- it allows one
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    # to define a form using declarative syntax.
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    # BaseForm itself has no way of designating self.fields.
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    __metaclass__ = DeclarativeFieldsMetaclass
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class BoundField(StrAndUnicode):
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    "A Field plus data"
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    def __init__(self, form, field, name):
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        self.form = form
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        self.field = field
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        self.name = name
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        self.html_name = form.add_prefix(name)
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        self.html_initial_name = form.add_initial_prefix(name)
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        if self.field.label is None:
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            self.label = pretty_name(name)
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        else:
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            self.label = self.field.label
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        self.help_text = field.help_text or ''
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    def __unicode__(self):
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        """Renders this field as an HTML widget."""
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        if self.field.show_hidden_initial:
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            return self.as_widget() + self.as_hidden(only_initial=True)
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   333
        return self.as_widget()
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    def _errors(self):
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        """
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        Returns an ErrorList for this field. Returns an empty ErrorList
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        if there are none.
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        """
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        return self.form.errors.get(self.name, self.form.error_class())
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    errors = property(_errors)
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    def as_widget(self, widget=None, attrs=None, only_initial=False):
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        """
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        Renders the field by rendering the passed widget, adding any HTML
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   346
        attributes passed as attrs.  If no widget is specified, then the
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        field's default widget will be used.
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        """
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        if not widget:
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            widget = self.field.widget
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        attrs = attrs or {}
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        auto_id = self.auto_id
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   353
        if auto_id and 'id' not in attrs and 'id' not in widget.attrs:
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            attrs['id'] = auto_id
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   355
        if not self.form.is_bound:
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            data = self.form.initial.get(self.name, self.field.initial)
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            if callable(data):
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   358
                data = data()
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   359
        else:
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            data = self.data
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   361
        if not only_initial:
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   362
            name = self.html_name
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   363
        else:
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   364
            name = self.html_initial_name
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   365
        return widget.render(name, data, attrs=attrs)
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   366
        
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   367
    def as_text(self, attrs=None, **kwargs):
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        """
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        Returns a string of HTML for representing this as an <input type="text">.
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        """
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        return self.as_widget(TextInput(), attrs, **kwargs)
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   372
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   373
    def as_textarea(self, attrs=None, **kwargs):
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        "Returns a string of HTML for representing this as a <textarea>."
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diff changeset
   375
        return self.as_widget(Textarea(), attrs, **kwargs)
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   376
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   377
    def as_hidden(self, attrs=None, **kwargs):
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        """
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   379
        Returns a string of HTML for representing this as an <input type="hidden">.
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   380
        """
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   381
        return self.as_widget(self.field.hidden_widget(), attrs, **kwargs)
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   382
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   383
    def _data(self):
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   384
        """
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   385
        Returns the data for this BoundField, or None if it wasn't given.
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   386
        """
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   387
        return self.field.widget.value_from_datadict(self.form.data, self.form.files, self.html_name)
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diff changeset
   388
    data = property(_data)
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   389
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   390
    def label_tag(self, contents=None, attrs=None):
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parents:
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   391
        """
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   392
        Wraps the given contents in a <label>, if the field has an ID attribute.
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parents:
diff changeset
   393
        Does not HTML-escape the contents. If contents aren't given, uses the
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parents:
diff changeset
   394
        field's HTML-escaped label.
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parents:
diff changeset
   395
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diff changeset
   396
        If attrs are given, they're used as HTML attributes on the <label> tag.
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parents:
diff changeset
   397
        """
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diff changeset
   398
        contents = contents or escape(self.label)
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diff changeset
   399
        widget = self.field.widget
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diff changeset
   400
        id_ = widget.attrs.get('id') or self.auto_id
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parents:
diff changeset
   401
        if id_:
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diff changeset
   402
            attrs = attrs and flatatt(attrs) or ''
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parents:
diff changeset
   403
            contents = u'<label for="%s"%s>%s</label>' % (widget.id_for_label(id_), attrs, unicode(contents))
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parents:
diff changeset
   404
        return mark_safe(contents)
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parents:
diff changeset
   405
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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diff changeset
   406
    def _is_hidden(self):
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diff changeset
   407
        "Returns True if this BoundField's widget is hidden."
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parents:
diff changeset
   408
        return self.field.widget.is_hidden
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parents:
diff changeset
   409
    is_hidden = property(_is_hidden)
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parents:
diff changeset
   410
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diff changeset
   411
    def _auto_id(self):
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parents:
diff changeset
   412
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   413
        Calculates and returns the ID attribute for this BoundField, if the
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   414
        associated Form has specified auto_id. Returns an empty string otherwise.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   415
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   416
        auto_id = self.form.auto_id
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parents:
diff changeset
   417
        if auto_id and '%s' in smart_unicode(auto_id):
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parents:
diff changeset
   418
            return smart_unicode(auto_id) % self.html_name
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parents:
diff changeset
   419
        elif auto_id:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   420
            return self.html_name
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parents:
diff changeset
   421
        return ''
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   422
    auto_id = property(_auto_id)